source: trunk/gli/src/org/greenstone/gatherer/cdm/CollectionConfiguration.java@ 12165

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.cdm;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import org.greenstone.gatherer.Configuration;
import org.greenstone.gatherer.DebugStream;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.gui.GLIButton;
import org.greenstone.gatherer.metadata.MetadataElement;
import org.greenstone.gatherer.metadata.MetadataSetManager;
import org.greenstone.gatherer.metadata.MetadataTools;
import org.greenstone.gatherer.remote.RemoteGreenstoneServer;
import org.greenstone.gatherer.util.DOMTree;
import org.greenstone.gatherer.util.Codec;
import org.greenstone.gatherer.util.StaticStrings;
import org.greenstone.gatherer.util.XMLTools;
import org.greenstone.gatherer.util.ZipTools;
import org.w3c.dom.*;

/** This class provides access to an xml-type view of the collect.cfg file. This is useful as it allows the manipulation and free form editing of a collect.cfg file while still allowing the various CDM data managers to base themselves directly on this model (whereas they used to be independant ListModels which clobbered the ordering of unparsed commands).
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.3d
 */
public class CollectionConfiguration
    extends StaticStrings {
    
    static final public String ENCODING = "UTF-8";

    static public Document document;

    /** Find the best insertion position for the given DOM Element. This should try to match command tag, and if found should then try to group by name or type (eg CollectionMeta), or append to end is no such grouping exists (eg Plugins). Failing a command match it will check against the command order for the best insertion location.
     * @param target_element the command Element to be inserted
     * @return the Element which the given command should be inserted before, or null to append to end of list
     */
    static public Node findInsertionPoint(Element target_element) {
    ///ystem.err.println("Find insertion point: " + target_element.getNodeName());
    String target_element_name = target_element.getNodeName();
    Element document_element = document.getDocumentElement();
    // Try to find commands with the same tag.
    NodeList matching_elements = document_element.getElementsByTagName(target_element_name);
    // If we found matching elements, then we have our most likely insertion location, so check within for groupings
    if(matching_elements.getLength() != 0) {
        ///ystem.err.println("Found matching elements.");
        // Only CollectionMeta are grouped.
        if(target_element_name.equals(COLLECTIONMETADATA_ELEMENT)) {
        ///ystem.err.println("Dealing with collection metadata");
        // Special case: CollectionMeta can be added at either the start or end of a collection configuration file. However the start position is reserved for special metadata, so if no non-special metadata can be found we must append to the end.
        // So if the command to be added is special add it immediately after any other special command
        if(target_element.getAttribute(SPECIAL_ATTRIBUTE).equals(TRUE_STR)) {
            int index = 0;
            Element matched_element = (Element) matching_elements.item(index);
            Element sibling_element = (Element) matched_element.getNextSibling();
            while(sibling_element.getAttribute(SPECIAL_ATTRIBUTE).equals(TRUE_STR)) {
            index++;
            matched_element = (Element) matching_elements.item(index);
            sibling_element = (Element) matched_element.getNextSibling();
            }
            if(sibling_element.getNodeName().equals(NEWLINE_ELEMENT)) {
            Element newline_element = document.createElement(NEWLINE_ELEMENT);
            document_element.insertBefore(newline_element, sibling_element);
            }
            return sibling_element;
        }
        // Otherwise try to find a matching 'name' and add after the last one in that group.
        else {
            int index = 0;
            target_element_name = target_element.getAttribute(NAME_ATTRIBUTE);
            boolean found = false;
            // Skip all of the special metadata
            Element matched_element = (Element) matching_elements.item(index);
            while(matched_element.getAttribute(SPECIAL_ATTRIBUTE).equals(TRUE_STR)) {
            index++;
            matched_element = (Element) matching_elements.item(index);
            }
            // Begin search
            while(!found && matched_element != null) {
            if(matched_element.getAttribute(NAME_ATTRIBUTE).equals(target_element_name)) {
                found = true;
            }
            else {
                index++;
                matched_element = (Element) matching_elements.item(index);
            }
            }
            // If we found a match, we need to continue checking until we find the last name match.
            if(found) {
            index++;
            Element previous_sibling = matched_element;
            Element sibling_element = (Element) matching_elements.item(index);
            while(sibling_element != null && sibling_element.getAttribute(NAME_ATTRIBUTE).equals(target_element_name)) {
                previous_sibling = sibling_element;
                index++;
                sibling_element = (Element) matching_elements.item(index);
            }
            // Previous sibling now holds the command immediately before where we want to add, so find its next sibling and add to that. In this one case we can ignore new lines!
            return previous_sibling.getNextSibling();
            }
            // If not found we just add after last metadata element
            else {
            Element last_element = (Element) matching_elements.item(matching_elements.getLength() - 1);
            return last_element.getNextSibling();
            }
        }

        }
        else {
        ///ystem.err.println("Not dealing with collection meta.");
        Element matched_element = (Element) matching_elements.item(matching_elements.getLength() - 1);
        // One final quick test. If the matched element is immediately followed by a NewLine command, then we insert another NewLine after the matched command, then return the NewLine instead (thus the about to be inserted command will be placed between the two NewLines)
        Node sibling_element = matched_element.getNextSibling();
        if(sibling_element != null && sibling_element.getNodeName().equals(NEWLINE_ELEMENT)) {
            Element newline_element = document.createElement(NEWLINE_ELEMENT);
            document_element.insertBefore(newline_element, sibling_element);
        }
        return sibling_element; // Note that this may be null
        }
    }
    ///ystem.err.println("No matching elements found.");
    // Locate where this command is in the ordering
    int command_index = -1;
    for(int i = 0; command_index == -1 && i < COMMAND_ORDER.length; i++) {
        if(COMMAND_ORDER[i].equals(target_element_name)) {
        command_index = i;
        }
    }
    ///ystem.err.println("Command index is: " + command_index);
    // Now move forward, checking for existing elements in each of the preceeding command orders.
    int preceeding_index = command_index - 1;
    ///ystem.err.println("Searching before the target command.");
    while(preceeding_index >= 0) {
        matching_elements = document_element.getElementsByTagName(COMMAND_ORDER[preceeding_index]);
        // If we've found a match
        if(matching_elements.getLength() > 0) {
        // We add after the last element
        Element matched_element = (Element) matching_elements.item(matching_elements.getLength() - 1);
        // One final quick test. If the matched element is immediately followed by a NewLine command, then we insert another NewLine after the matched command, then return the NewLine instead (thus the about to be inserted command will be placed between the two NewLines)
        Node sibling_element = matched_element.getNextSibling();
        if(sibling_element != null && sibling_element.getNodeName().equals(NEWLINE_ELEMENT)) {
            Element newline_element = document.createElement(NEWLINE_ELEMENT);
            document_element.insertBefore(newline_element, sibling_element);
        }
        return sibling_element; // Note that this may be null
        }
        preceeding_index--;
    }
    // If all that fails, we now move backwards through the commands
    int susceeding_index = command_index + 1;
    ///ystem.err.println("Searching after the target command.");
    while(susceeding_index < COMMAND_ORDER.length) {
        matching_elements = document_element.getElementsByTagName(COMMAND_ORDER[susceeding_index]);
        // If we've found a match
        if(matching_elements.getLength() > 0) {
        // We add before the first element
        Element matched_element = (Element) matching_elements.item(0);
        // One final quick test. If the matched element is immediately preceeded by a NewLine command, then we insert another NewLine before the matched command, then return this new NewLine instead (thus the about to be inserted command will be placed between the two NewLines)
        Node sibling_element = matched_element.getPreviousSibling();
        if(sibling_element != null && sibling_element.getNodeName().equals(NEWLINE_ELEMENT)) {
            Element newline_element = document.createElement(NEWLINE_ELEMENT);
            document_element.insertBefore(newline_element, sibling_element);
        }
        return sibling_element; // Note that this may be null
        }
        susceeding_index++;
    }
    // Well. Apparently there are no other commands in this collection configuration. So append away...
    return null;
    }

    static public String toString(Element command_element, boolean show_extracted_namespace) {
    String command_element_name = command_element.getNodeName();
    if(command_element_name.equals(CLASSIFY_ELEMENT)) {
        return classifyToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(FORMAT_ELEMENT)) {
        return formatToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(INDEXES_ELEMENT)) {
        return indexesToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(INDEX_DEFAULT_ELEMENT)) {
        return indexDefaultToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(LANGUAGES_ELEMENT)) {
        return languagesToString(command_element);
    }
    else if(command_element_name.equals(LANGUAGE_DEFAULT_ELEMENT)) {
        return languageDefaultToString(command_element);
    }
    else if(command_element_name.equals(LEVELS_ELEMENT)) {
        return levelsToString(command_element);
    }
    else if(command_element_name.equals(LEVEL_DEFAULT_ELEMENT)) {
        return levelDefaultToString(command_element);
    }
    else if(command_element_name.equals(COLLECTIONMETADATA_ELEMENT)) {
        return metadataToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(COLLECTIONMETADATA_CREATOR_ELEMENT)) {
        return metadataToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(COLLECTIONMETADATA_MAINTAINER_ELEMENT)) {
        return metadataToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(COLLECTIONMETADATA_PUBLIC_ELEMENT)) {
        return metadataToString(command_element, show_extracted_namespace);
    }
    else if (command_element_name.equals(BUILDTYPE_ELEMENT)) {
        return metadataToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(PLUGIN_ELEMENT)) {
        return pluginToString(command_element, show_extracted_namespace);
    }
//  else if(command_element_name.equals(SEARCHTYPE_ELEMENT)) {
//      return searchtypeToString(command_element);
//  }
    else if(command_element_name.equals(SUBCOLLECTION_ELEMENT)) {
        return subcollectionToString(command_element, show_extracted_namespace);
    }
    else if(command_element_name.equals(SUBCOLLECTION_DEFAULT_INDEX_ELEMENT)) {
        return subcollectionDefaultIndexToString(command_element);
    }
    else if(command_element_name.equals(SUBCOLLECTION_INDEXES_ELEMENT)) {
        return subcollectionIndexesToString(command_element);
    }
    else if(command_element_name.equals(SUPERCOLLECTION_ELEMENT)) {
        return supercollectionToString(command_element);
    }
    else if(command_element_name.equals(UNKNOWN_ELEMENT)) {
        return unknownToString(command_element);
    }
    return "";
    }

    /** Parses arguments from a tokenizer and returns a HashMap of mappings. The tricky bit here is that not all entries in the HashMap are name->value pairs, as some arguments are boolean and are turned on by their presence. Arguments are denoted by a '-' prefix.
     * @param tokenizer a CommandTokenizer based on the unconsumed portion of a command string
     * @return a HashMap containing the arguments parsed
     */
    static public HashMap parseArguments(CommandTokenizer tokenizer) {
    HashMap arguments = new HashMap();
    String name = null;
    String value = null;
    while(tokenizer.hasMoreTokens() || name != null) {
        // First we retrieve a name if we need one.
        if(name == null) {
        name = tokenizer.nextToken();
        }
        // Now we attempt to retrieve a value
        if(tokenizer.hasMoreTokens()) {
        value = tokenizer.nextToken();
        // Test if the value is actually a name, and if so add the name by itself, then put value into name so that it is parsed correctly during the next loop.
        if(value.startsWith(StaticStrings.MINUS_CHARACTER)) {
            arguments.put(name, null);
            name = value;
        }
        // Otherwise we have a typical name->value pair ready to go
        else {
            arguments.put(name, value);
            name = null;
        }
        }
        // Otherwise its a binary flag
        else {
        arguments.put(name, null);
        name = null;
        }
    }
    return arguments;
    }

    static private ArrayList known_metadata;

    /** Gives the preferred ordering of commands */
    static final private String[] COMMAND_ORDER = {StaticStrings.COLLECTIONMETADATA_CREATOR_ELEMENT, StaticStrings.COLLECTIONMETADATA_MAINTAINER_ELEMENT, StaticStrings.COLLECTIONMETADATA_PUBLIC_ELEMENT,  /*StaticStrings.SEARCHTYPE_ELEMENT,*/ StaticStrings.BUILDTYPE_ELEMENT, StaticStrings.PLUGIN_ELEMENT, StaticStrings.INDEXES_ELEMENT, StaticStrings.INDEX_DEFAULT_ELEMENT, StaticStrings.LEVELS_ELEMENT, StaticStrings.LEVEL_DEFAULT_ELEMENT, StaticStrings.LANGUAGES_ELEMENT, StaticStrings.LANGUAGE_DEFAULT_ELEMENT, StaticStrings.SUBCOLLECTION_ELEMENT, StaticStrings.SUBCOLLECTION_INDEXES_ELEMENT, StaticStrings.SUBCOLLECTION_DEFAULT_INDEX_ELEMENT, StaticStrings.SUPERCOLLECTION_ELEMENT, StaticStrings.CLASSIFY_ELEMENT, StaticStrings.FORMAT_ELEMENT, StaticStrings.COLLECTIONMETADATA_ELEMENT};

    /** ************************** Public Data Members ***************************/

    /** ************************** Private Data Members ***************************/
    
    private File collect_cfg_file;

    /** ************************** Public Methods ***************************/

    public CollectionConfiguration(File collect_cfg_file)
    {
    this.collect_cfg_file = collect_cfg_file;
    // parse the XML template
    document = XMLTools.parseXMLFile("xml/CollectionConfig.xml", true);
    parse(collect_cfg_file);
    
    }

    /** This debug facility shows the currently loaded collect.cfg or CollectConfig.xml file as a DOM tree. */
    public void display() {
    JDialog dialog = new JDialog(Gatherer.g_man, "Collection Configuration", false);
    dialog.setSize(400,400);
    JPanel content_pane = (JPanel) dialog.getContentPane();
    final DOMTree tree = new DOMTree(document);
    JButton refresh_button = new GLIButton("Refresh Tree");
    refresh_button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            tree.setDocument(document);
        }
        });
    content_pane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    content_pane.setLayout(new BorderLayout());
    content_pane.add(new JScrollPane(tree), BorderLayout.CENTER);
    content_pane.add(refresh_button, BorderLayout.SOUTH);
    dialog.setVisible(true);
    }


    public Element getCreator() {
    Element element = getOrCreateElementByTagName(COLLECTIONMETADATA_CREATOR_ELEMENT, null, null);
    element.setAttribute(NAME_ATTRIBUTE, COLLECTIONMETADATA_CREATOR_STR);
    element.setAttribute(SPECIAL_ATTRIBUTE, TRUE_STR);
    return element;
    }

    public Element getDocumentElement() {
    return document.getDocumentElement();
    }

    public File getFile() {
    return collect_cfg_file;
    }

    /** Retrieve or create the languages Element. */
    public Element getLanguages() {
    return getOrCreateElementByTagName(LANGUAGES_ELEMENT, null, null);
    }

    public Element getLevels() {
    return getOrCreateElementByTagName(LEVELS_ELEMENT, null, null);
    }

    public Element getMaintainer() {
    Element element = getOrCreateElementByTagName(COLLECTIONMETADATA_MAINTAINER_ELEMENT, null, null);
    element.setAttribute(NAME_ATTRIBUTE, COLLECTIONMETADATA_MAINTAINER_STR);
    element.setAttribute(SPECIAL_ATTRIBUTE, TRUE_STR);
    return element;
    }

    /** Retrieve or create the indexes Element. Note that this method behaves differently from the other getBlah methods, in that it also has to keep in mind that indexes come in two flavours, MG and MGPP. */
    public Element getMGIndexes() {
    return getOrCreateElementByTagName(INDEXES_ELEMENT, MGPP_ATTRIBUTE, FALSE_STR);
    }

    public Element getMGPPIndexes() {
    return getOrCreateElementByTagName(INDEXES_ELEMENT, MGPP_ATTRIBUTE, TRUE_STR);
    }

    public Element getPublic() {
    Element element = getOrCreateElementByTagName(COLLECTIONMETADATA_PUBLIC_ELEMENT, null, null);
    element.setAttribute(NAME_ATTRIBUTE, COLLECTIONMETADATA_PUBLIC_STR);
    element.setAttribute(SPECIAL_ATTRIBUTE, TRUE_STR);
    return element;
    }

    public Element getBuildType() {
    Element element = getOrCreateElementByTagName(BUILDTYPE_ELEMENT, null, null);
    element.setAttribute(NAME_ATTRIBUTE, BUILDTYPE_STR);
    element.setAttribute(SPECIAL_ATTRIBUTE, TRUE_STR);
    return element;

    }
//     /** Retrieve or create the searchtype element. */
//     public Element getSearchType() {
//  ///ystem.err.println("Get or create element by tag name: " + name);
//  Element document_element = document.getDocumentElement();
//  NodeList elements = document_element.getElementsByTagName(SEARCHTYPE_ELEMENT);
//  int elements_length = elements.getLength();
//  if(elements_length > 0) {
//      document_element = null;
//      return (Element) elements.item(0);
//  }
//  // Create the element
//  Element element = document.createElement(SEARCHTYPE_ELEMENT);
//  Node target_node = findInsertionPoint(element);
//  if(target_node != null) {
//      document_element.insertBefore(element, target_node);
//  }
//  else {
//      document_element.appendChild(element);
//  }
//  document_element = null;
//  // Append a default search type node - form
//  Element a_searchtype_element = CollectionDesignManager.collect_config.document.createElement(CollectionConfiguration.CONTENT_ELEMENT);
//  a_searchtype_element.setAttribute(CollectionConfiguration.NAME_ATTRIBUTE, SearchTypeManager.SEARCH_TYPES[0]);
//  element.appendChild(a_searchtype_element);
//  return element;
//     }

    /** Retrieve or create the subindexes Element. */
    public Element getSubIndexes() {
    return getOrCreateElementByTagName(SUBCOLLECTION_INDEXES_ELEMENT, null, null);
    }

    /** Retrieve or create the supercollections Element. */
    public Element getSuperCollection() {
    return getOrCreateElementByTagName(SUPERCOLLECTION_ELEMENT, null, null);
    }

    public boolean ready() {
    return document != null;
    }

    public void save() {
    if(collect_cfg_file.exists()) {
        File original_file = new File(collect_cfg_file.getParentFile(), COLLECT_CFG);
        File backup_file = new File(collect_cfg_file.getParentFile(), "collect.bak");
        if(backup_file.exists()) {
        backup_file.delete();
        }
        if(!original_file.renameTo(backup_file)) {
        DebugStream.println("Can't rename collect.cfg");
        }
    }
    
    try {       
        OutputStream ostream = new FileOutputStream(collect_cfg_file);
        Writer file_writer = new OutputStreamWriter(ostream, ENCODING);
        //FileWriter file_writer = new FileWriter(collect_cfg_file, false);
        BufferedWriter buffered_writer = new BufferedWriter(file_writer);
        Element collect_config_element = document.getDocumentElement();
        NodeList command_elements = collect_config_element.getChildNodes();
        boolean just_wrote_newline = false; // Prevent two or more newlines in a row
        for(int i = 0; i < command_elements.getLength(); i++) {
        Node command_node = command_elements.item(i);
        if(command_node instanceof Element) {
            Element command_element = (Element) command_node;
            // The only thing left are NewLine elements
            if(command_element.getNodeName().equals(NEWLINE_ELEMENT) && !just_wrote_newline) {
            buffered_writer.newLine();
            just_wrote_newline = true;
            }
            // Anything else we write to file, but only if it has been assigned, the exception being the Indexes element which just get commented if unassigned (a side effect of MG && MGPP compatibility)
            else if(!command_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(FALSE_STR) || command_element.getNodeName().equals(INDEXES_ELEMENT) || command_element.getNodeName().equals(INDEX_DEFAULT_ELEMENT) || command_element.getNodeName().equals(LEVELS_ELEMENT) || command_element.getNodeName().equals(LEVEL_DEFAULT_ELEMENT)){
            String command;
            // format statements we write out with ex. still present
            if (command_element.getNodeName().equals(FORMAT_ELEMENT)) {
                command = toString(command_element, true);
            } else {
                command = toString(command_element, false);
            }
            if(command != null && command.length()> 0 ) {
                write(buffered_writer, command);
                buffered_writer.newLine();
                just_wrote_newline = false;
            }
            }
        }
        }
        buffered_writer.close();
        
        // If we're using a remote Greenstone server, upload the new collect.cfg file
        if (Gatherer.isGsdlRemote) {
        String collection_name = Gatherer.c_man.getCollection().getName();
        RemoteGreenstoneServer.uploadCollectionFile(collection_name, collect_cfg_file);
        }
    }
    catch (Exception exception) {
        DebugStream.println("Error in CollectionConfiguration.save(boolean): " + exception);
        DebugStream.printStackTrace(exception);
    }
    
    }

    /** ************************** Private Methods ***************************/

    static private String classifyToString(Element command_element, boolean show_extracted_namespace)
    {
    StringBuffer text = new StringBuffer(CLASSIFY_STR);
    text.append(TAB_CHARACTER);
    text.append(command_element.getAttribute(TYPE_ATTRIBUTE));
    text.append(SPACE_CHARACTER);
    NodeList option_elements = command_element.getElementsByTagName(OPTION_ELEMENT);
    int option_elements_length = option_elements.getLength();
    for(int j = 0; j < option_elements_length; j++) {
        Element option_element = (Element) option_elements.item(j);
        if(option_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(TRUE_STR)) {
        text.append(StaticStrings.MINUS_CHARACTER);
        text.append(option_element.getAttribute(NAME_ATTRIBUTE));
        String value_str = XMLTools.getValue(option_element);

        // Remove the extracted metadata namespaces if required
        if (value_str.length() > 0) {
            StringTokenizer string_tokenizer = new StringTokenizer(value_str, ",");
            value_str = "";
            while (string_tokenizer.hasMoreElements()) {
            String raw_token = (String) string_tokenizer.nextElement();
            String token = raw_token.trim();
            MetadataElement metadata_element = MetadataTools.getMetadataElementWithDisplayName(token);
            if (metadata_element != null) {
                token = metadata_element.getFullName();
            }

            if (token.startsWith(StaticStrings.EXTRACTED_NAMESPACE)) {
                token = token.substring(StaticStrings.EXTRACTED_NAMESPACE.length());
            }

            value_str = value_str + token;
            if (string_tokenizer.hasMoreElements()) {
                value_str = value_str + ",";
            }
            }
        }

        text.append(SPACE_CHARACTER);
        if (value_str.indexOf(SPACE_CHARACTER) == -1) {
            text.append(value_str);
        }
        else {
            text.append(SPEECH_CHARACTER);
            text.append(value_str);
            text.append(SPEECH_CHARACTER);
        }
        value_str = null;
        if(j < option_elements_length - 1) {
            text.append(SPACE_CHARACTER);
        }
        }
        option_element = null;
    }
    option_elements = null;
    return text.toString();
    }

    static private String formatToString(Element command_element, boolean show_extracted_namespace) {
    StringBuffer text = new StringBuffer(FORMAT_STR);
    text.append(SPACE_CHARACTER);
    text.append(command_element.getAttribute(NAME_ATTRIBUTE));
    text.append(SPACE_CHARACTER);
    String value_str = command_element.getAttribute(VALUE_ATTRIBUTE);
    if(value_str.length() != 0) {
        text.append(value_str);
    }
    else {
        // Remember to encode format string to Greenstone specification
        value_str = Codec.transform(XMLTools.getValue(command_element), Codec.DOM_TO_GREENSTONE);
        // Remove any references to a namespace for extracted metadata
        if (!show_extracted_namespace) {
        String match_string = "\\[" + MetadataSetManager.EXTRACTED_METADATA_NAMESPACE + "\\.";
        value_str = value_str.replaceAll(match_string, "[");
        }

        text.append(SPEECH_CHARACTER);
        text.append(value_str);
        text.append(SPEECH_CHARACTER);
    }
    value_str = null;
    return text.toString();
    }

    /** Retrieve or create the indexes Element. */
    static private Element getOrCreateElementByTagName(String name, String conditional_attribute, String required_value) {
    Element document_element = document.getDocumentElement();
    NodeList elements = document_element.getElementsByTagName(name);
    int elements_length = elements.getLength();
    if(elements_length > 0) {
        if(conditional_attribute == null) {
        document_element = null;
        return (Element) elements.item(0);
        }
        else {
        for(int i = 0; i < elements_length; i++) {
            Element element = (Element) elements.item(i);
            if(element.getAttribute(conditional_attribute).equals(required_value)) {
            document_element = null;
            return element;
            }
            element = null;
        }
        }
    }
    // Create the element
    Element element = document.createElement(name);
    // If there was a property set it
    if(conditional_attribute != null) {
        element.setAttribute(conditional_attribute, required_value);
    }
    Node target_node = findInsertionPoint(element);
    if(target_node != null) {
        document_element.insertBefore(element, target_node);
    }
    else {
        document_element.appendChild(element);
    }
    document_element = null;
    return element;
    }

    static private String indexesToString(Element command_element, boolean show_extracted_namespace) {
    boolean comment_only = false;
    StringBuffer text = new StringBuffer("");
    if(command_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(FALSE_STR)) {
        text.append("#");
        comment_only = true;
    }
    text.append(INDEX_STR);
    text.append(TAB_CHARACTER);
    if(!comment_only) {
        text.append(TAB_CHARACTER);
    }
    NodeList index_elements = command_element.getElementsByTagName(INDEX_ELEMENT);
    if (index_elements.getLength() == 0) { // no indexes
        return "";
    }
    // For each index, write its level, a colon, then concatenate its child content elements into a single comma separated list
    int index_elements_length = index_elements.getLength();
    for(int j = 0; j < index_elements_length; j++) {
        Element index_element = (Element) index_elements.item(j);
        String level_str = index_element.getAttribute(LEVEL_ATTRIBUTE);
        if(level_str.length() > 0) {
        text.append(level_str);
        text.append(StaticStrings.COLON_CHARACTER);
        }
        NodeList content_elements = index_element.getElementsByTagName(CONTENT_ELEMENT);
        int content_elements_length = content_elements.getLength();
        // Don't output anything if no indexes are set
        if(content_elements_length == 0) {
        return null;
        }
        for(int k = 0; k < content_elements_length; k++) {
        Element content_element = (Element) content_elements.item(k);
        String name_str = content_element.getAttribute(NAME_ATTRIBUTE);
        if(!show_extracted_namespace && name_str.startsWith(StaticStrings.EXTRACTED_NAMESPACE)) {
            name_str = name_str.substring(StaticStrings.EXTRACTED_NAMESPACE.length());
        }
        text.append(name_str);
        name_str = null;
        if(k < content_elements_length - 1) {
            text.append(StaticStrings.COMMA_CHARACTER);
        }
        content_element = null;
        }
        if(j < index_elements_length - 1) {
        text.append(SPACE_CHARACTER);
        }
        content_elements = null;
        index_element = null;
    }
    index_elements = null;
    return text.toString();
    }

    static private String indexDefaultToString(Element command_element, boolean show_extracted_namespace) {
    StringBuffer text = new StringBuffer("");
    if(command_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(FALSE_STR)) {
        text.append("#");
    }
    text.append(INDEX_DEFAULT_STR);
    text.append(TAB_CHARACTER);
    if (!command_element.getAttribute(LEVEL_ATTRIBUTE).equals("")) {
        text.append(command_element.getAttribute(LEVEL_ATTRIBUTE));
        text.append(StaticStrings.COLON_CHARACTER);
    }
    NodeList content_elements = command_element.getElementsByTagName(CONTENT_ELEMENT);
    int content_elements_length = content_elements.getLength();
    for(int j = 0; j < content_elements_length; j++) {
        Element content_element = (Element) content_elements.item(j);
        String name_str = content_element.getAttribute(NAME_ATTRIBUTE);
        if(!show_extracted_namespace && name_str.startsWith(StaticStrings.EXTRACTED_NAMESPACE)) {
        name_str = name_str.substring(StaticStrings.EXTRACTED_NAMESPACE.length());
        }
        text.append(name_str);
        name_str = null;
        if(j < content_elements_length - 1) {
        text.append(StaticStrings.COMMA_CHARACTER);
        }
        content_element = null;
    }
    content_elements = null;
    return text.toString();
    }

    static private String languagesToString(Element command_element) {
    StringBuffer text = new StringBuffer(LANGUAGES_STR);
    text.append(TAB_CHARACTER);
    // Retrieve all the languages and write them out in a space separated list
    NodeList language_elements = command_element.getElementsByTagName(LANGUAGE_ELEMENT);
    int language_elements_length = language_elements.getLength();
    if(language_elements_length == 0) {
        return null;
    }
    for(int j = 0; j < language_elements_length; j++) {
        Element language_element = (Element) language_elements.item(j);
        text.append(language_element.getAttribute(NAME_ATTRIBUTE));
        if(j < language_elements_length - 1) {
        text.append(SPACE_CHARACTER);
        }
    }
    return text.toString();
    }

    static private String languageDefaultToString(Element command_element) {
    StringBuffer text = new StringBuffer(LANGUAGE_DEFAULT_STR);
    text.append(TAB_CHARACTER);
    text.append(command_element.getAttribute(NAME_ATTRIBUTE));
    return text.toString();
    }

    static private String levelsToString(Element command_element) {
    StringBuffer text = new StringBuffer("");
    if(command_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(FALSE_STR)) {
        text.append("#");
    }
    text.append(LEVELS_STR);
    text.append(TAB_CHARACTER);
    text.append(TAB_CHARACTER);
    NodeList content_elements = command_element.getElementsByTagName(LEVEL_ELEMENT);
    int content_elements_length = content_elements.getLength();
    // Don't output anything if no levels are set.
    if(content_elements_length == 0) {
        return null;
    }
    for(int i = 0; i < content_elements_length; i++) {
        Element content_element = (Element) content_elements.item(i);
        text.append(content_element.getAttribute(NAME_ATTRIBUTE));
        text.append(SPACE_CHARACTER);
    }
    return text.substring(0, text.length() - 1);
    }

    static private String levelDefaultToString(Element command_element) {
    StringBuffer text = new StringBuffer("");
    if(command_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(FALSE_STR)) {
        text.append("#");
    }
    text.append(LEVEL_DEFAULT_STR);
    text.append(TAB_CHARACTER);
    text.append(command_element.getAttribute(NAME_ATTRIBUTE));
    return text.toString();
    }
    
    

    static private String metadataToString(Element command_element, boolean text_value) {
    // lets first check the value - if its empty, don't bother sticking it in the config file
    String value_str = XMLTools.getValue(command_element);
    if (value_str.equals("")) {
        return "";
    }
    boolean special = false;
    
    StringBuffer text = new StringBuffer("");
    String name_str = command_element.getAttribute(NAME_ATTRIBUTE);
    // If the name is one of the special four, we don't write the collectionmeta first. Note maintainer and buildtype are singled out for 'prittying' reasons.
    if(name_str.equals(COLLECTIONMETADATA_MAINTAINER_STR)|| name_str.equals(BUILDTYPE_STR) ) {
        text.append(name_str);
        text.append(TAB_CHARACTER);
        special = true;
    }
    else if (name_str.equals(COLLECTIONMETADATA_CREATOR_STR) || name_str.equals(COLLECTIONMETADATA_PUBLIC_STR) ) {
        text.append(name_str);
        text.append(TAB_CHARACTER);
        text.append(TAB_CHARACTER);
        special = true;
    }
    else {
        text.append(COLLECTIONMETADATA_STR);
        text.append(TAB_CHARACTER);
        text.append(name_str);
        text.append(SPACE_CHARACTER);
        String language_str = command_element.getAttribute(LANGUAGE_ATTRIBUTE);
        text.append(LBRACKET_CHARACTER);
        text.append(LANGUAGE_ARGUMENT);
        text.append(language_str);
        text.append(RBRACKET_CHARACTER);
        text.append(SPACE_CHARACTER);

        if(known_metadata != null) {
        known_metadata.add(name_str);
        }
        language_str = null;
    }
    name_str = null;

    // The value string we retrieved will be encoded for xml, so we now decode it - to text if text_value set. This parameter was originally show_extracted_namespace, but sincethis is only true for 'toString()' commands from within the CDM, its good enough to determine if this toString() will be used to display on screen, or write to collect.cfg
    if(text_value == CollectionMeta.TEXT) {
        value_str = Codec.transform(value_str, Codec.DOM_TO_TEXT);
    }
    else {
        value_str = Codec.transform(value_str, Codec.DOM_TO_GREENSTONE);
    }

    // We don't wrap the email addresses in quotes, nor the other special metadata
    if(special) {
        text.append(value_str);
    }
    else {
        text.append(SPEECH_CHARACTER);
        text.append(value_str);
        text.append(SPEECH_CHARACTER);
    }
    value_str = null;
    return text.toString();
    }

    /** Parse a collect.cfg into a DOM model representation. 
     * note we are ignoring 2.39 compatibility now. */
    private void parse(File collect_cfg_file) {
    // hack for pre 2.71 compatibility - we need to add in a 
    // build type if there is not one there
    boolean search_types_parsed = false;
    boolean build_types_parsed = false;
    try {

        Element collect_cfg_element = document.getDocumentElement();
        // Read in the file one command at a time.
        InputStream istream = new FileInputStream(collect_cfg_file);
        Reader in_reader = new InputStreamReader(istream, ENCODING);
        BufferedReader in = new BufferedReader(in_reader);
        String command_str = null;
        while((command_str = in.readLine()) != null) {
        boolean append_element = true;
        Element command_element = null;
        // A command may be broken over several lines.
        command_str = command_str.trim();
        boolean eof = false;
        while(!eof && command_str.endsWith(NEWLINE_CHARACTER)) {
            String next_line = in.readLine();
            if(next_line != null) {
            next_line = next_line.trim();
            if(next_line.length() > 0) {
                // Remove the new line character
                command_str = command_str.substring(0, command_str.lastIndexOf(NEWLINE_CHARACTER));
                // And append the next line, which due to the test above must be non-zero length
                command_str = command_str + next_line;
            }
            next_line = null;
            }
            // If we've reached the end of the file theres nothing more we can do
            else {
            eof = true;
            }
        }
        // If there is still a new line character, then we remove it and hope for the best
        if(command_str.endsWith(NEWLINE_CHARACTER)) {
            command_str = command_str.substring(0, command_str.lastIndexOf(NEWLINE_CHARACTER));
        }
        // Now we've either got a command to parse...
        if(command_str.length() != 0) {
            // Start trying to figure out what it is
            //StringTokenizer tokenizer = new StringTokenizer(command_str);
            // Instead of a standard string tokenizer I'm going to use the new version of CommandTokenizer, which is not only smart enough to correctly notice speech marks and correctly parse them out, but now also takes the input stream so it can rebuild tokens that stretch over several lines.
            CommandTokenizer tokenizer = new CommandTokenizer(command_str, in);
            String command_type = tokenizer.nextToken().toLowerCase();
            // Why can't you switch on strings eh? We pass it to the various subparsers who each have a bash at parsing the command. If none can parse the command, an unknown element is created
            if(command_element == null && command_type.equals(CLASSIFY_STR)) {
            command_element = parseClassify(command_str);
            }
            if(command_element == null && command_type.equals(FORMAT_STR)) {
            command_element = parseFormat(tokenizer); // Revised to handle multiple lines
            }
            if(command_element == null && (command_type.equals(INDEX_STR)  || command_type.equals(COMMENTED_INDEXES_STR))) {
            command_element = parseIndex(command_str);
            }
            if(command_element == null && (command_type.equals(INDEX_DEFAULT_STR) || command_type.equals(COMMENTED_INDEX_DEFAULT_STR))) {
            
            command_element = parseIndexDefault(command_str);
            }
            if(command_element == null && command_type.equals(LANGUAGES_STR)) {
            command_element = parseLanguage(command_str);
            }
            if(command_element == null && command_type.equals(LANGUAGE_DEFAULT_STR)) {
            command_element = parseLanguageDefault(command_str);
            }
            if(command_element == null && (command_type.equals(LEVELS_STR) || command_type.equals(COMMENTED_LEVELS_STR))) {
            command_element = parseLevels(command_str);
            }
            if(command_element == null && (command_type.equals(LEVEL_DEFAULT_STR) || command_type.equals(COMMENTED_LEVEL_DEFAULT_STR))) {
            
            command_element = parseLevelDefault(command_str);
            }

            if(command_element == null && command_type.equals(COLLECTIONMETADATA_STR)) {
            command_element = parseMetadata(tokenizer); // Revised to handle multiple lines
            }
            if(command_element == null && (command_type.equals(COLLECTIONMETADATA_PUBLIC_STR) || command_type.equals(COLLECTIONMETADATA_CREATOR_STR) || command_type.equals(COLLECTIONMETADATA_MAINTAINER_STR) || command_type.equals(BUILDTYPE_STR))) {
            command_element = parseMetadataSpecial(command_str);
            // pre 2.71 hack
            if (command_type.equals(BUILDTYPE_STR)) {
                build_types_parsed = true;
            }
            }
            if(command_element == null && command_type.equals(PLUGIN_STR)) {
            command_element = parsePlugin(command_str);
            }
            // leave here for backwards compatibility
            if(command_element == null && command_type.equals(SEARCHTYPE_STR)) {
            command_element = parseSearchType(command_str);
            // pre 2.71 hack
            search_types_parsed = true;
            
            }
            if(command_element == null && command_type.equals(SUBCOLLECTION_STR)) {
            command_element = parseSubCollection(command_str);
            }
            if(command_element == null && command_type.equals(SUBCOLLECTION_DEFAULT_INDEX_STR)) {
            command_element = parseSubCollectionDefaultIndex(command_str);
            }
            if(command_element == null && command_type.equals(SUBCOLLECTION_INDEX_STR)) {
            command_element = parseSubCollectionIndex(command_str);
            }
            if(command_element == null && (command_type.equals(SUPERCOLLECTION_STR) || command_type.equals(CCS_STR))) {
            command_element = parseSuperCollection(command_str);
            }
            // Doesn't match any known type
            command_type = null;
            if(command_element == null) {
            // No-one knows what to do with this command, so we create an Unknown command element
            command_element = document.createElement(UNKNOWN_ELEMENT);
            XMLTools.setValue(command_element, command_str);
            }
        }
        // Or an empty line to remember for later
        else {
            command_element = document.createElement(NEWLINE_ELEMENT);
        }
        // Now command element shouldn't be null so we append it to the collection config DOM, but only if we haven't been told not to add it
        //if(append_element) {
            collect_cfg_element.appendChild(command_element);
            //}
        }
        if (!build_types_parsed) {
        String buildtype_type = BuildTypeManager.BUILD_TYPE_MG;
        if (search_types_parsed) {
            buildtype_type = BuildTypeManager.BUILD_TYPE_MGPP;
        }
        Element command_element = parseMetadataSpecial(BUILDTYPE_STR+"  "+buildtype_type);
        Node target_node = findInsertionPoint(command_element);
        if(target_node != null) {
            collect_cfg_element.insertBefore(command_element, target_node);
        }
        else {
            collect_cfg_element.appendChild(command_element);
        }

        }
    }
    catch(Exception exception) {
        DebugStream.println("Error in CollectionConfiguration.parse(java.io.File): " + exception);
        DebugStream.printStackTrace(exception);
    }
    }
    
 
    private Element parseClassify(String command_str) {
    Element command_element = null;
    try {
        CommandTokenizer tokenizer = new CommandTokenizer(command_str);
        // Check the token count. The token count from a command tokenizer isn't guarenteed to be correct, but it does give the maximum number of available tokens according to the underlying StringTokenizer (some of which may actually be append together by the CommandTokenizer as being a single argument).
        if(tokenizer.countTokens() >= 2) {  // Must support "classify Phind" (no args)
        command_element = document.createElement(CLASSIFY_ELEMENT);
        // First token is classify
        tokenizer.nextToken();
        // The next token is the classifier type
        command_element.setAttribute(TYPE_ATTRIBUTE, tokenizer.nextToken());
        // Now we parse out the remaining arguments into a hashmapping from name to value
        HashMap arguments = parseArguments(tokenizer);
        // Assign the arguments as Option elements, but watch out for the metadata argument as we treat that differently
        Iterator names = arguments.keySet().iterator();
        while(names.hasNext()) {
            String name = (String) names.next();
            String value = (String) arguments.get(name); // Can be null
            // The metadata argument gets added as the content attribute
            if (name.equals(METADATA_ARGUMENT) && value != null) {
            // Add the extracted namespace onto un-namespaced metadata names
            StringTokenizer string_tokenizer = new StringTokenizer(value, ",");
            value = "";
            while (string_tokenizer.hasMoreElements()) {
                String token = (String) string_tokenizer.nextElement();

                if (token.indexOf(StaticStrings.NS_SEP) == -1) {
                token = StaticStrings.EXTRACTED_NAMESPACE + token;
                }
                else {
                MetadataElement metadata_element = MetadataTools.getMetadataElementWithName(token);
                if (metadata_element != null) {
                    token = metadata_element.getDisplayName();
                }
                }

                if (!value.equals("")) {
                value = value + ",";
                }
                value = value + token;
            }
            }
            // Everything else is an Option Element
            Element option_element = document.createElement(OPTION_ELEMENT);
            option_element.setAttribute(NAME_ATTRIBUTE, name.substring(1));
            if(value != null) {
            // Remove any speech marks appended in strings containing whitespace
            if(value.startsWith(SPEECH_CHARACTER) && value.endsWith(SPEECH_CHARACTER)) {
                value = value.substring(1, value.length() - 1);
            }
            XMLTools.setValue(option_element, value);
            }
            option_element.setAttribute(ASSIGNED_ATTRIBUTE, TRUE_STR);
            option_element.setAttribute(CUSTOM_ATTRIBUTE, TRUE_STR);
            command_element.appendChild(option_element);
            option_element = null;
            name = null;
            value = null;
        }
        names = null;
        arguments = null;
        }
        tokenizer = null;
    }
    catch(Exception error) {
    }
    return command_element;
    }

    private Element parseFormat(CommandTokenizer tokenizer) {
    Element command_element = null;
    try {
        command_element = document.createElement(FORMAT_ELEMENT);
        String name_str = tokenizer.nextToken();
        String value_str = tokenizer.nextToken();
        if(name_str != null && value_str != null) {
        command_element.setAttribute(NAME_ATTRIBUTE, name_str);
        // If the value is true or false we add it as an attribute
        if(value_str.equalsIgnoreCase(TRUE_STR) || value_str.equalsIgnoreCase(FALSE_STR)) {
            command_element.setAttribute(VALUE_ATTRIBUTE, value_str.toLowerCase());
        }
        // Otherwise it gets added as a text node
        else {
            // Ready the value str (which can contain all sorts of funky characters) for writing as a DOM value
            value_str = Codec.transform(value_str, Codec.GREENSTONE_TO_DOM);
            XMLTools.setValue(command_element, value_str);
        }
        }
        else {
        command_element = null;
        }
        name_str = null;
        value_str = null;
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
        command_element = null;
    }
    return command_element;
    }

    private Element parseIndex(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        String command = tokenizer.nextToken();
        command_element = document.createElement(INDEXES_ELEMENT);
        command_element.setAttribute(ASSIGNED_ATTRIBUTE, (command.equals(INDEX_STR) ? TRUE_STR : FALSE_STR));
        command = null;
        if(!tokenizer.hasMoreTokens()) {

        // there are no indexes
        command_element.setAttribute(ASSIGNED_ATTRIBUTE, FALSE_STR);
        command_element.setAttribute(MGPP_ATTRIBUTE, FALSE_STR); // for now
        tokenizer = null;
        return command_element;
        }

        while(tokenizer.hasMoreTokens()) {
        Element index_element = document.createElement(INDEX_ELEMENT);
        String index_str = tokenizer.nextToken();
        // There are two types of index we have to consider. Old G2.38 and earlier use level:source tuplets while G2.39+ have just a single, non-comma separated list where order is important.
        boolean old_index;
        if(index_str.indexOf(COLON_CHARACTER) != -1) {
            old_index = true;
            index_element.setAttribute(LEVEL_ATTRIBUTE, index_str.substring(0, index_str.indexOf(StaticStrings.COLON_CHARACTER)));
            index_str = index_str.substring(index_str.indexOf(StaticStrings.COLON_CHARACTER) + 1);
            command_element.setAttribute(MGPP_ATTRIBUTE, FALSE_STR);
        }
        else {
            command_element.setAttribute(MGPP_ATTRIBUTE, TRUE_STR);
            old_index = false;
        }
        StringTokenizer content_tokenizer = new StringTokenizer(index_str, StaticStrings.COMMA_CHARACTER);
        while(content_tokenizer.hasMoreTokens()) {
            Element content_element = document.createElement(CONTENT_ELEMENT);
            String content_str = content_tokenizer.nextToken();
            // Since the contents of indexes have to be certain keywords, or metadata elements, if the content isn't a keyword and doesn't yet have a namespace, append the extracted metadata namespace.
            if(content_str.indexOf(StaticStrings.NS_SEP) == -1) {
            if(content_str.equals(StaticStrings.TEXT_STR) || (!old_index && content_str.equals(StaticStrings.ALLFIELDS_STR))) {
                // Our special strings are OK.
            }
            else {
                content_str = StaticStrings.EXTRACTED_NAMESPACE + content_str;
            }
            }
            content_element.setAttribute(NAME_ATTRIBUTE, content_str);
            index_element.appendChild(content_element);
            content_element = null;
        }
        content_tokenizer = null;
        index_str = null;
        command_element.appendChild(index_element);
        index_element = null;
        }
        tokenizer = null;
    }
    catch (Exception exception) {
        exception.printStackTrace();
    }
    return command_element;
    }

    private Element parseIndexDefault(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        if(tokenizer.countTokens() >= 2) {
        command_element = document.createElement(INDEX_DEFAULT_ELEMENT);
        command_element.setAttribute(ASSIGNED_ATTRIBUTE, ((tokenizer.nextToken()).equals(INDEX_DEFAULT_STR) ? TRUE_STR : FALSE_STR));
        String index_str = tokenizer.nextToken();
        command_element.setAttribute(LEVEL_ATTRIBUTE, index_str.substring(0, index_str.indexOf(StaticStrings.COLON_CHARACTER)));
        String content_str = index_str.substring(index_str.indexOf(StaticStrings.COLON_CHARACTER) + 1);
        StringTokenizer content_tokenizer = new StringTokenizer(content_str, StaticStrings.COMMA_CHARACTER);
        while(content_tokenizer.hasMoreTokens()) {
            Element content_element = document.createElement(CONTENT_ELEMENT);
            content_element.setAttribute(NAME_ATTRIBUTE, content_tokenizer.nextToken());
            command_element.appendChild(content_element);
            content_element = null;
        }
        content_tokenizer = null;
        content_str = null;
        content_str = null;
        index_str = null;
        }
        tokenizer = null;
    }
    catch (Exception exception) {
    }
    return command_element;
    }

    private Element parseLanguage(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        tokenizer.nextToken();
        if(tokenizer.hasMoreTokens()) {
        command_element = document.createElement(LANGUAGES_ELEMENT);
        while(tokenizer.hasMoreTokens()) {
            Element language_element = document.createElement(LANGUAGE_ELEMENT);
            language_element.setAttribute(NAME_ATTRIBUTE, tokenizer.nextToken());
            command_element.appendChild(language_element);
            language_element = null;
        }
        }
        tokenizer = null;
    }
    catch (Exception exception) {
    }
    return command_element;
    }

    private Element parseLanguageDefault(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        if(tokenizer.countTokens() >= 2) {
        command_element = document.createElement(LANGUAGE_DEFAULT_ELEMENT);
        tokenizer.nextToken();
        String default_language_str = tokenizer.nextToken();
        command_element.setAttribute(NAME_ATTRIBUTE, default_language_str);
        command_element.setAttribute(ASSIGNED_ATTRIBUTE, StaticStrings.TRUE_STR);
        default_language_str = null;
        }
        tokenizer = null;
    }
    catch (Exception exception) {
    }
    return command_element;
    }

    private Element parseLevels(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        // First token is command type (levels)
        String command = tokenizer.nextToken();
        if(tokenizer.hasMoreTokens()) {
        command_element = document.createElement(LEVELS_ELEMENT);
        command_element.setAttribute(ASSIGNED_ATTRIBUTE, (command.equals(LEVELS_STR) ? TRUE_STR : FALSE_STR));
        while(tokenizer.hasMoreTokens()) {
            Element level_element = document.createElement(LEVEL_ELEMENT);
            level_element.setAttribute(NAME_ATTRIBUTE, tokenizer.nextToken());
            command_element.appendChild(level_element);
            level_element = null;
        }
        }
        command = null;
    }
    catch(Exception exception) {
    }
    return command_element;
    }

    private Element parseLevelDefault(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        if(tokenizer.countTokens() >= 2) {
        command_element = document.createElement(LEVEL_DEFAULT_ELEMENT);
        command_element.setAttribute(ASSIGNED_ATTRIBUTE, ((tokenizer.nextToken()).equals(LEVEL_DEFAULT_STR) ? TRUE_STR : FALSE_STR)); // is it commented out or not?
        command_element.setAttribute(NAME_ATTRIBUTE, tokenizer.nextToken());
        }
        
        tokenizer = null;
    }
    catch (Exception exception) {
    }
    return command_element;
    }

    private Element parseMetadata(CommandTokenizer tokenizer) {
    Element command_element = null;
    try {
        command_element = document.createElement(COLLECTIONMETADATA_ELEMENT);
        String name_str = tokenizer.nextToken();
        String value_str = tokenizer.nextToken();
        if(name_str != null && value_str != null) {
        String language_str = Configuration.getLanguage();
        // Check if the value string is actually a language string
        if(value_str.startsWith(LBRACKET_CHARACTER) && value_str.endsWith(RBRACKET_CHARACTER)) {
            language_str = value_str.substring(value_str.indexOf(LANGUAGE_ARGUMENT) + 2, value_str.length() - 1);
            value_str = tokenizer.nextToken();
        }
        if(value_str != null) {
            // Ready the value str (which can contain all sorts of funky characters) for writing as a DOM value
            value_str = Codec.transform(value_str, Codec.GREENSTONE_TO_DOM);
            command_element.setAttribute(NAME_ATTRIBUTE, name_str);
            command_element.setAttribute(LANGUAGE_ATTRIBUTE, language_str);
            command_element.setAttribute(ASSIGNED_ATTRIBUTE, TRUE_STR);
            XMLTools.setValue(command_element, value_str);
        }
        else {
            command_element = null;
        }
        language_str = null;
        }
        else {
        command_element = null;
        }
        name_str = null;
        value_str = null;
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
        command_element = null;
    }
    return command_element;
    }

    private Element parseMetadataSpecial(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        if(tokenizer.countTokens() >= 2) {
        String name_str = tokenizer.nextToken();
        String value_str = tokenizer.nextToken();
        if (name_str.equals(COLLECTIONMETADATA_CREATOR_STR)) {
            command_element = document.createElement(COLLECTIONMETADATA_CREATOR_ELEMENT);
        }
        else if(name_str.equals(COLLECTIONMETADATA_MAINTAINER_STR)) {
            command_element = document.createElement(COLLECTIONMETADATA_MAINTAINER_ELEMENT);
        }
        else if(name_str.equals(COLLECTIONMETADATA_PUBLIC_STR)) {
            command_element = document.createElement(COLLECTIONMETADATA_PUBLIC_ELEMENT);
        }
        else if (name_str.equals(BUILDTYPE_STR)) {
            command_element = document.createElement(BUILDTYPE_ELEMENT);
        }
        if(command_element != null) {
            command_element.setAttribute(NAME_ATTRIBUTE, name_str);
            command_element.setAttribute(LANGUAGE_ATTRIBUTE, ENGLISH_LANGUAGE_STR);
            command_element.setAttribute(SPECIAL_ATTRIBUTE, TRUE_STR);
            command_element.setAttribute(ASSIGNED_ATTRIBUTE, TRUE_STR);
            if(value_str.startsWith(SPEECH_CHARACTER) && value_str.endsWith(SPEECH_CHARACTER)) {
            value_str = value_str.substring(1, value_str.length() - 1);
            }
            XMLTools.setValue(command_element, value_str);
        }
        value_str = null;
        name_str = null;
        }
        tokenizer = null;
    }
    catch (Exception exception) {
    }
    return command_element;
    }

    private Element parsePlugin(String command_str) {
    Element command_element = null;
    boolean use_metadata_files = false;
    try {
        CommandTokenizer tokenizer = new CommandTokenizer(command_str);
        // Check the token count. The token count from a command tokenizer isn't guarenteed to be correct, but it does give the maximum number of available tokens according to the underlying StringTokenizer (some of which may actually be append together by the CommandTokenizer as being a single argument).
        if(tokenizer.countTokens() >= 2) {
        command_element = document.createElement(PLUGIN_ELEMENT);
        // First token is plugin
        tokenizer.nextToken();
        // The next token is the type
        String type = tokenizer.nextToken();
        command_element.setAttribute(TYPE_ATTRIBUTE, type);
        // Now we parse out the remaining arguments into a hashmapping from name to value
        HashMap arguments = parseArguments(tokenizer);
        // Assign the arguments as Option elements, but watch out for the metadata argument as we treat that differently
        Iterator names = arguments.keySet().iterator();
        while(names.hasNext()) {
            String name = (String) names.next();
            String value = (String) arguments.get(name); // Can be null
            Element option_element = document.createElement(OPTION_ELEMENT);
            if(name.substring(1).equals(USE_METADATA_FILES_ARGUMENT)) {
            use_metadata_files = true;
            }
            option_element.setAttribute(NAME_ATTRIBUTE, name.substring(1));
            option_element.setAttribute(ASSIGNED_ATTRIBUTE, TRUE_STR);
            option_element.setAttribute(CUSTOM_ATTRIBUTE, TRUE_STR); // All arguments are considered to be custom until matched against base plugins arguments
            if(value != null) {
            // Remove any speech marks appended in strings containing whitespace
            if(value.startsWith(SPEECH_CHARACTER) && value.endsWith(SPEECH_CHARACTER)) {
                value = value.substring(1, value.length() - 1);
            }
            if(name.equals(METADATA_ARGUMENT)) {
                // The metadata argument must be the fully qualified name of a metadata element, so if it doesn't yet have a namespace, append the extracted metadata namespace.
                if(value.indexOf(StaticStrings.NS_SEP) == -1) {
                value = StaticStrings.EXTRACTED_NAMESPACE + value;
                }
            }
            XMLTools.setValue(option_element, value);
            }
            command_element.appendChild(option_element);
            option_element = null;
            name = null;
            value = null;
        }

        // We must have some RecPlug options: use_metadata_files
        if (type.equals(RECPLUG_STR)) {
            if (!use_metadata_files) {
            Element option_element = document.createElement(OPTION_ELEMENT);
            option_element.setAttribute(NAME_ATTRIBUTE, USE_METADATA_FILES_ARGUMENT);
            option_element.setAttribute(ASSIGNED_ATTRIBUTE, TRUE_STR);
            option_element.setAttribute(CUSTOM_ATTRIBUTE, TRUE_STR);
            command_element.appendChild(option_element);
            option_element = null;
            }
        }
        type = null;
        names = null;
        arguments = null;
        }
        tokenizer = null;
    }
    catch(Exception exception) {
    }
    return command_element;
    }

    /* search types are now handled as formats - leave this here to convert in case we have an old config file */
    private Element parseSearchType(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        // First token is command type (searchtype)
        tokenizer.nextToken();
        if(tokenizer.hasMoreTokens()) {
        command_element = document.createElement(FORMAT_ELEMENT);
        command_element.setAttribute(NAME_ATTRIBUTE, "SearchTypes");
        String value = tokenizer.nextToken();
        while(tokenizer.hasMoreTokens()) {
            value += ","+tokenizer.nextToken();
        }
        value = Codec.transform(value, Codec.GREENSTONE_TO_DOM);
        XMLTools.setValue(command_element, value);      
        }
    }
    catch(Exception exception) {
    }
    return command_element;
    }

    private Element parseSubCollection(String command_str) {
    Element command_element = null;
    try {
        CommandTokenizer tokenizer = new CommandTokenizer(command_str);
        if(tokenizer.countTokens() >= 3) {
        command_element = document.createElement(SUBCOLLECTION_ELEMENT);
        // First token is command type
        tokenizer.nextToken();
        // Then subcollection identifier
        command_element.setAttribute(NAME_ATTRIBUTE, tokenizer.nextToken());
        // Then finally the pattern used to build the subcollection partition
        String full_pattern_str = tokenizer.nextToken();
        // Set inclusion/exclusion flag and remove any exclamation mark
        boolean exclusion = full_pattern_str.startsWith(EXCLAMATION_CHARACTER);
        if (exclusion) {
            full_pattern_str = full_pattern_str.substring(1, full_pattern_str.length());
            command_element.setAttribute(TYPE_ATTRIBUTE, EXCLUDE_STR);
        }
        else {
            command_element.setAttribute(TYPE_ATTRIBUTE, INCLUDE_STR);
        }
        StringTokenizer pattern_tokenizer = new StringTokenizer(full_pattern_str, SEPARATOR_CHARACTER);
        if(pattern_tokenizer.countTokens() >= 2) {
            String content_str = pattern_tokenizer.nextToken();
            // Since the contents of indexes have to be certain keywords, or metadata elements, if the content isn't a keyword and doesn't yet have a namespace, append the extracted metadata namespace.
            if(!content_str.equals(StaticStrings.FILENAME_STR) && content_str.indexOf(StaticStrings.NS_SEP) == -1) {
            content_str = StaticStrings.EXTRACTED_NAMESPACE + content_str;
            }
            command_element.setAttribute(CONTENT_ATTRIBUTE, content_str);
            XMLTools.setValue(command_element, pattern_tokenizer.nextToken());
            if(pattern_tokenizer.hasMoreTokens()) {
            command_element.setAttribute(OPTIONS_ATTRIBUTE, pattern_tokenizer.nextToken());
            }
        }
        pattern_tokenizer = null;
        }
    }
    catch(Exception exception) {
        exception.printStackTrace();
    }
    return command_element;
    }

    private Element parseSubCollectionDefaultIndex(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        if(tokenizer.countTokens() == 2) {
        command_element = document.createElement(SUBCOLLECTION_DEFAULT_INDEX_ELEMENT);
        tokenizer.nextToken();
        //command_element.setAttribute(CONTENT_ATTRIBUTE, tokenizer.nextToken());
        String content_str = tokenizer.nextToken();
        StringTokenizer content_tokenizer = new StringTokenizer(content_str, StaticStrings.COMMA_CHARACTER);
        while(content_tokenizer.hasMoreTokens()) {
            Element content_element = document.createElement(CONTENT_ELEMENT);
            content_element.setAttribute(NAME_ATTRIBUTE, content_tokenizer.nextToken());
            command_element.appendChild(content_element);
            content_element = null;
        }
        content_tokenizer = null;
        content_str = null;
        }
        tokenizer = null;
    }
    catch(Exception exception) {
    }
    return command_element;
    }

    private Element parseSubCollectionIndex(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        tokenizer.nextToken();
        if(tokenizer.hasMoreTokens()) {
        command_element = document.createElement(SUBCOLLECTION_INDEXES_ELEMENT);
        }
        while(tokenizer.hasMoreTokens()) {
        Element subcollectionindex_element = document.createElement(INDEX_ELEMENT);
        //command_element.setAttribute(CONTENT_ATTRIBUTE, tokenizer.nextToken());
        String content_str = tokenizer.nextToken();
        StringTokenizer content_tokenizer = new StringTokenizer(content_str, StaticStrings.COMMA_CHARACTER);
        while(content_tokenizer.hasMoreTokens()) {
            Element content_element = document.createElement(CONTENT_ELEMENT);
            content_element.setAttribute(NAME_ATTRIBUTE, content_tokenizer.nextToken());
            subcollectionindex_element.appendChild(content_element);
            content_element = null;
        }
        content_tokenizer = null;
        content_str = null;
        command_element.appendChild(subcollectionindex_element);
        subcollectionindex_element = null;
        }
        tokenizer = null;
    }
    catch (Exception exception) {
    }
    return command_element;
    }

    private Element parseSuperCollection(String command_str) {
    Element command_element = null;
    try {
        StringTokenizer tokenizer = new StringTokenizer(command_str);
        if(tokenizer.countTokens() >= 3) {
        command_element = document.createElement(SUPERCOLLECTION_ELEMENT);
        tokenizer.nextToken();
        while(tokenizer.hasMoreTokens()) {
            Element collection_element = document.createElement(COLLECTION_ELEMENT);
            collection_element.setAttribute(NAME_ATTRIBUTE, tokenizer.nextToken());
            command_element.appendChild(collection_element);
            collection_element = null;
        }
        }
        tokenizer = null;
    }
    catch(Exception exception) {
    }
    return command_element;
    }

    static private String pluginToString(Element command_element, boolean show_extracted_namespace) {
    StringBuffer text = new StringBuffer();
    if(!command_element.getAttribute(SEPARATOR_ATTRIBUTE).equals(TRUE_STR)) {
        text.append(PLUGIN_STR);
        text.append(TAB_CHARACTER);
        text.append(TAB_CHARACTER);
        text.append(command_element.getAttribute(TYPE_ATTRIBUTE));
        // Retrieve, and output, the arguments
        NodeList option_elements = command_element.getElementsByTagName(OPTION_ELEMENT);
        int option_elements_length = option_elements.getLength();
        if(option_elements_length > 0) {
        text.append(SPACE_CHARACTER);
        for(int j = 0; j < option_elements_length; j++) {
            Element option_element = (Element) option_elements.item(j);
            if(option_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(TRUE_STR)) {
            text.append(StaticStrings.MINUS_CHARACTER);
            text.append(option_element.getAttribute(NAME_ATTRIBUTE));
            String value_str = XMLTools.getValue(option_element);
            if(!show_extracted_namespace && value_str.startsWith(StaticStrings.EXTRACTED_NAMESPACE)) {
                value_str = value_str.substring(StaticStrings.EXTRACTED_NAMESPACE.length());
            }
            if(value_str.length() > 0) {
                text.append(SPACE_CHARACTER);
                if(value_str.indexOf(SPACE_CHARACTER) == -1) {
                text.append(value_str);
                }
                else {
                text.append(SPEECH_CHARACTER);
                text.append(value_str);
                text.append(SPEECH_CHARACTER);
                }
            }
            value_str = null;
            if(j < option_elements_length - 1) {
                text.append(SPACE_CHARACTER);
            }
            }
            option_element = null;
        }
        }
        option_elements = null;
    }
    return text.toString();
    }

    static private String searchtypeToString(Element command_element) {
    if(command_element.getAttribute(ASSIGNED_ATTRIBUTE).equals(TRUE_STR)) {
        StringBuffer text = new StringBuffer(SEARCHTYPE_STR);
        text.append(TAB_CHARACTER);
        NodeList search_elements = command_element.getElementsByTagName(CONTENT_ELEMENT);
        int search_elements_length = search_elements.getLength();
        for(int i = 0; i < search_elements_length; i++) {
        Element search_element = (Element) search_elements.item(i);
        text.append(search_element.getAttribute(NAME_ATTRIBUTE));
        text.append(SPACE_CHARACTER);
        }
        return text.substring(0, text.length() - 1);
    }
    else {
        return null;
    }
    }

    static private String subcollectionToString(Element command_element, boolean show_extracted_namespace) {
    StringBuffer text = new StringBuffer(SUBCOLLECTION_STR);
    text.append(SPACE_CHARACTER);
    text.append(command_element.getAttribute(NAME_ATTRIBUTE));
    text.append(SPACE_CHARACTER);
    text.append(TAB_CHARACTER);
    text.append(SPEECH_CHARACTER);
    if(command_element.getAttribute(TYPE_ATTRIBUTE).equals(EXCLUDE_STR)) {
        text.append(EXCLAMATION_CHARACTER);
    }
    String content_str = command_element.getAttribute(CONTENT_ATTRIBUTE);
    if(!show_extracted_namespace && content_str.startsWith(StaticStrings.EXTRACTED_NAMESPACE)) {
        content_str = content_str.substring(StaticStrings.EXTRACTED_NAMESPACE.length());
    }
    text.append(content_str);
    content_str = null;
    text.append(SEPARATOR_CHARACTER);
    text.append(XMLTools.getValue(command_element));
    text.append(SEPARATOR_CHARACTER);
    String options_str = command_element.getAttribute(OPTIONS_ATTRIBUTE);
    if(options_str.length() > 0) {
        text.append(options_str);
    }
    options_str = null;
    text.append(SPEECH_CHARACTER);
    return text.toString();
    }

    static private String subcollectionDefaultIndexToString(Element command_element) {
    StringBuffer text = new StringBuffer(SUBCOLLECTION_DEFAULT_INDEX_STR);
    text.append(TAB_CHARACTER);
    NodeList content_elements = command_element.getElementsByTagName(CONTENT_ELEMENT);
    int content_elements_length = content_elements.getLength();
    for(int j = 0; j < content_elements_length; j++) {
        Element content_element = (Element) content_elements.item(j);
        text.append(content_element.getAttribute(NAME_ATTRIBUTE));
        if(j < content_elements_length - 1) {
        text.append(StaticStrings.COMMA_CHARACTER);
        }
    }
    return text.toString();
    }

    static private String subcollectionIndexesToString(Element command_element) {
    StringBuffer text = new StringBuffer(SUBCOLLECTION_INDEX_STR);
    text.append(TAB_CHARACTER);
    // Retrieve all of the subcollection index partitions
    NodeList subcollectionindex_elements = command_element.getElementsByTagName(INDEX_ELEMENT);
    int subcollectionindex_elements_length = subcollectionindex_elements.getLength();
    if(subcollectionindex_elements_length == 0) {
        return null;
    }
    for(int j = 0; j < subcollectionindex_elements_length; j++) {
        Element subcollectionindex_element = (Element) subcollectionindex_elements.item(j);
        NodeList content_elements = subcollectionindex_element.getElementsByTagName(CONTENT_ELEMENT);
        int content_elements_length = content_elements.getLength();
        for(int k = 0; k < content_elements_length; k++) {
        Element content_element = (Element) content_elements.item(k);
        text.append(content_element.getAttribute(NAME_ATTRIBUTE));
        if(k < content_elements_length - 1) {
            text.append(StaticStrings.COMMA_CHARACTER);
        }
        }
        if(j < subcollectionindex_elements_length - 1) {
        text.append(SPACE_CHARACTER);
        }
    }
    return text.toString();
    }

    static private String supercollectionToString(Element command_element) {
    NodeList content_elements = command_element.getElementsByTagName(COLLECTION_ELEMENT);
    int content_elements_length = content_elements.getLength();
    if(content_elements_length > 1) {
        StringBuffer text = new StringBuffer(SUPERCOLLECTION_STR);
        text.append(TAB_CHARACTER);
        for(int j = 0; j < content_elements_length; j++) {
        Element content_element = (Element) content_elements.item(j);
        text.append(content_element.getAttribute(NAME_ATTRIBUTE));
        if(j < content_elements_length - 1) {
            text.append(SPACE_CHARACTER);
        }
        }
        return text.toString();
    }
    return null;
    }

    static private String unknownToString(Element command_element) {
    return XMLTools.getValue(command_element);
    }

    /** Write the text to the buffer. This is used so we don't have to worry about storing intermediate String values just so we can calaulate length and offset.
     * @param writer the BufferedWriter to which the str will be written
     * @param str the String to be written
     */
    private void write(BufferedWriter writer, String str)
    throws IOException {
    writer.write(str, 0, str.length());
    }
}