source: trunk/gli/src/org/greenstone/gatherer/Configuration.java@ 10610

/**
 *#########################################################################
 * Configuration
 * 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.
 *
 * <BR><BR>
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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;

import java.awt.*;
import java.io.*;
import java.lang.ref.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.*;
import org.greenstone.gatherer.util.StaticStrings;
import org.greenstone.gatherer.util.XMLTools;
import org.w3c.dom.*;

/** This class stores the various configurable settings inside the Gatherer, both during a session, and between sessions in the form of XML. However not all data members are retained during xml serialization. To further improve efficiency, the property-name -> DOM Element pairs are stored in a SoftReferenced Hashtable.
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.3
 */
public class Configuration
    extends Hashtable {

    static final public boolean COLLECTION_SPECIFIC = true;
    static final public boolean GENERAL_SETTING = true;

    static final public int ASSISTANT_MODE = 1;
    static final public int LIBRARIAN_MODE = 2;
    static final public int SYSTEMS_MODE   = 3;
    static final public int EXPERT_MODE    = 4; 

    /** The string identifying an argument's name attribute. */
    static final private String ARGUMENT_NAME = "name";
    /** The name of the general Gatherer configuration file. */
    static public String CONFIG_XML = "config.xml";
    /** The name of the general Gatherer configuration file for running with GS3. */
    static public String GS3_CONFIG_XML = "config3.xml";

    /** The name of the root element of the subtree containing gatherer configuration options. This is required as the document itself may contain several other subtrees of settings (such as in the case of a '.col' file). */
    static final private String GATHERER_CONFIG = "GathererConfig";
    /** The string identifying an argument element. */
    static final private String GATHERER_CONFIG_ARGUMENT = "Argument";

    static final private String GENERAL_EMAIL_SETTING = "general.email";
    /** the lang attribute of the other element */
    static final private String LANGUAGE = "lang";
    /** The name of a Name Element. */
    static final private String NAME = "Name";
    /** The name of the other arguments element. */
    static final private String OTHER = "Other";
    /** The name of an information Element within the Other subtree. */
    static final private String OTHER_INFO = "Info";
    /** The name of the general Gatherer configuration template. */
    static public String TEMPLATE_CONFIG_XML = "xml/config.xml";
    /** The first of three patterns used during tokenization, this pattern handles a comma separated list. */
    static final private String TOKENIZER_PATTERN1 = " ,\n\t";
    /** The second of three patterns used during tokenization, this pattern handles an underscore separated list. */
    static final private String TOKENIZER_PATTERN2 = "_\n\t";
    /** The last of three patterns used during tokenization, this pattern handles an comma separated list containing spaces. */
    static final private String TOKENIZER_PATTERN3 = ",\n\t";

    static public Configuration self = null;
    static private String gli_user_directory_path = null;

    static public boolean just_updated_config_xml_file = false;
    /** The path to the Greenstone Suite installation directory. */
    static public String gsdl_path = "";
    /** If we are using GLI in Greenstone 3, the path to gsdl3 home (== web dir) */
    static public String gsdl3_path = "";
    /** If we are using GLI in Greenstone 3, the path to gsdl3 src directory (== gsdl3 dir)*/
    static public String gsdl3_src_path = "";
    /** The path to the PERL executable, up to and including Perl.exe. */
    static public String perl_path = "";
    /** The password for the proxy server indicated above. */
    static public String proxy_pass = null;
    /** The username for the proxy server indicated above. */
    static public String proxy_user = null;
    /** The screen size of the desktop the Gatherer will be displayed on. */
    static public Dimension screen_size = Toolkit.getDefaultToolkit().getScreenSize();
    /** The site name if we are using GS3 */
    static public String site_name = "";
    /** The servlet path if we are using GS3 */
    static public String servlet_path = "";
    /** Collection level configuration (which in some cases overrides general configuration. */
    static private Document collection_config;
    /** The general configuration settings. */
    static private Document general_config;

    /** The element, from glis config file, that contains the various directory mappings. */
    static private Element directory_mappings_element;

    static private int cache_hit = 0;
    static private int cache_miss = 0;

    static private String wget_path = null;
    static private String wget_version_str = StaticStrings.NO_WGET_STR;

    static public URL gliserver_url = null;
    static public URL library_url = null;


    /** Constructor.
     * @param gsdl_path The path to the Greenstone directory as a <strong>String</strong>.
     * @param gsdl3_path The path to the Greenstone 3 home (web) directory as a <strong>String</strong>.
     * @param gsdl3_src_path The path to the Greenstone 3 src directory as a <strong>String</strong>.
     * @param site_name The name of the Greenstone 3 site currently in use.
     */
    public Configuration(String gli_user_directory_path, String gsdl_path, String gsdl3_path, String gsdl3_src_path, String site_name)
    {
    super();
    self = this;

    this.gli_user_directory_path = gli_user_directory_path;
    this.gsdl_path = gsdl_path;
    this.gsdl3_path = gsdl3_path;
    this.gsdl3_src_path = gsdl3_src_path;
    this.site_name = site_name;

    // Try to load the configuration file from the user specific location
    String config_xml_file_name = CONFIG_XML;
    if (gsdl3_path != null) {
        config_xml_file_name = GS3_CONFIG_XML;
    }

    // If the existing user config.xml file isn't recent enough, backup the old version and update it
    File config_xml_file = new File(gli_user_directory_path + config_xml_file_name);
    if (config_xml_file != null && config_xml_file.exists()) {
        just_updated_config_xml_file = updateUserConfigXMLFileIfNecessary(config_xml_file);
        general_config = XMLTools.parseXMLFile(config_xml_file);
    }

    // Create a new config from the default configuration file from our xml library
    if (general_config == null) {
        general_config = XMLTools.parseXMLFile(TEMPLATE_CONFIG_XML, true);
        just_updated_config_xml_file = true;
    }

    // Determine the Directory Mappings element
    directory_mappings_element = (Element) XMLTools.getNodeFromNamed(general_config.getDocumentElement(), StaticStrings.DIRECTORY_MAPPINGS_ELEMENT);

    // Re-establish the color settings.
    updateUI();

    // Read the Greenstone library URL from the config file
    String library_url_string = getString("general.library_url", true);
    if (!library_url_string.equals("")) {
        try {
        library_url = new URL(library_url_string);
        }
        catch (MalformedURLException exception) {
        DebugStream.printStackTrace(exception);
        }
    }

    // Read the Greenstone gliserver URL from the config file, if using a remote Greenstone
    if (Gatherer.isGsdlRemote) {
        String gliserver_url_string = getString("general.gliserver_url", true);
        if (!gliserver_url_string.equals("")) {
        try {
            gliserver_url = new URL(gliserver_url_string);
        }
        catch (MalformedURLException exception) {
            DebugStream.printStackTrace(exception);
        }
        }
    }

    if (gsdl3_path != null) {
        if (this.site_name == null || this.site_name.equals("")) {
        this.site_name = getString("general.site_name", true);
        this.servlet_path = getString("general.servlet_path", true);
        if (this.site_name.equals("")) {
            this.site_name = "localsite"; // can we assume these??
            this.servlet_path = "/library";
            setString("general.site_name", true, this.site_name);
            setString("general.servlet_path", true, this.servlet_path);
        }
        
        } else {
        // we set the current one in the config
        setString("general.site_name", true, this.site_name);
        if (this.servlet_path != null && !this.servlet_path.equals("")) {
            setString("general.servlet_path", true, this.servlet_path);
        }
        }
    }
    }


    static private boolean updateUserConfigXMLFileIfNecessary(File config_xml_file)
    {
    // Check if the configuration file actually needs updating by looking at the version numbers
    Document new_document = XMLTools.parseXMLFile(TEMPLATE_CONFIG_XML, true);
    Document old_document = XMLTools.parseXMLFile(config_xml_file);

    String new_version = new_document.getDocumentElement().getAttribute(StaticStrings.VERSION_ATTRIBUTE);
    String old_version = old_document.getDocumentElement().getAttribute(StaticStrings.VERSION_ATTRIBUTE);
    if (new_version.compareTo(old_version) <= 0) {
        // Don't need to update file
        return false;
    }

    System.err.println("Updating user config.xml from version " + old_version + " to version " + new_version + "...");

    // Build up the new user config.xml file from the template config.xml with the user's preferences added
    // Make a backup of the old config.xml file first
    config_xml_file.renameTo(new File(config_xml_file.getAbsolutePath() + ".old"));

    // Check all of the Argument elements in the new config.xml file
    NodeList new_argument_elements_nodelist = new_document.getElementsByTagName("Argument");
    NodeList old_argument_elements_nodelist = old_document.getElementsByTagName("Argument");
    for (int i = 0; i < new_argument_elements_nodelist.getLength(); i++) {
        Element new_argument_element = (Element) new_argument_elements_nodelist.item(i);
        String new_argument_element_name = new_argument_element.getAttribute("name");
        String new_argument_element_value = XMLTools.getElementTextValue(new_argument_element);

        // Did this Argument have a non-default value set?
        for (int j = old_argument_elements_nodelist.getLength() - 1; j >= 0; j--) {
        Element old_argument_element = (Element) old_argument_elements_nodelist.item(j);
        String old_argument_element_name = old_argument_element.getAttribute("name");

        // Argument found
        if (old_argument_element_name.equals(new_argument_element_name)) {
            String old_argument_element_value = XMLTools.getElementTextValue(old_argument_element);
            if (!old_argument_element_value.equals(new_argument_element_value)) {
            XMLTools.setElementTextValue(new_argument_element, old_argument_element_value);
            }

            // We don't care about this option any more
            old_argument_element.getParentNode().removeChild(old_argument_element);
            break;
        }
        }
    }

    // Are there any old Argument elements left over? Keep these around for old time's sake
    old_argument_elements_nodelist = old_document.getElementsByTagName("Argument");
    if (old_argument_elements_nodelist.getLength() > 0) {
        NodeList new_gathererconfig_elements_nodelist = new_document.getElementsByTagName("GathererConfig");
        if (new_gathererconfig_elements_nodelist.getLength() > 0) {
        Element new_gathererconfig_element = (Element) new_gathererconfig_elements_nodelist.item(0);
        new_gathererconfig_element.appendChild(new_document.createComment(" Legacy options "));

        // Add the legacy Arguments to the GathererConfig element
        for (int i = 0; i < old_argument_elements_nodelist.getLength(); i++) {
            Element old_argument_element = (Element) old_argument_elements_nodelist.item(i);
            new_gathererconfig_element.appendChild(new_document.importNode(old_argument_element, true));
        }
        }
    }

    // Keep all the Mapping elements
    NodeList new_directorymappings_elements_nodelist = new_document.getElementsByTagName("DirectoryMappings");
    if (new_directorymappings_elements_nodelist.getLength() > 0) {
        Element new_directorymappings_element = (Element) new_directorymappings_elements_nodelist.item(0);

        NodeList old_mapping_elements_nodelist = old_document.getElementsByTagName("Mapping");
        for (int i = 0; i < old_mapping_elements_nodelist.getLength(); i++) {
        Element old_mapping_element = (Element) old_mapping_elements_nodelist.item(i);
        new_directorymappings_element.appendChild(new_document.importNode(old_mapping_element, true));
        }
    }

    // Check all of the Associations elements in the new config.xml file
    NodeList new_entry_elements_nodelist = new_document.getElementsByTagName("Entry");
    NodeList old_entry_elements_nodelist = old_document.getElementsByTagName("Entry");
    for (int i = 0; i < new_entry_elements_nodelist.getLength(); i++) {
        Element new_entry_element = (Element) new_entry_elements_nodelist.item(i);
        String new_entry_element_name = new_entry_element.getAttribute("extension");
        String new_entry_element_value = XMLTools.getElementTextValue(new_entry_element);

        // Did this Entry have a non-default value set?
        for (int j = old_entry_elements_nodelist.getLength() - 1; j >= 0; j--) {
        Element old_entry_element = (Element) old_entry_elements_nodelist.item(j);
        String old_entry_element_name = old_entry_element.getAttribute("extension");

        // Entry found
        if (old_entry_element_name.equals(new_entry_element_name)) {
            String old_entry_element_value = XMLTools.getElementTextValue(old_entry_element);
            if (!old_entry_element_value.equals(new_entry_element_value)) {
            XMLTools.setElementTextValue(new_entry_element, old_entry_element_value);
            }

            // We don't care about this option any more
            old_entry_element.getParentNode().removeChild(old_entry_element);
            break;
        }
        }
    }

    // Are there any old Entry elements left over? We want to keep these
    old_entry_elements_nodelist = old_document.getElementsByTagName("Entry");
    if (old_entry_elements_nodelist.getLength() > 0) {
        NodeList new_associations_elements_nodelist = new_document.getElementsByTagName("Associations");
        if (new_associations_elements_nodelist.getLength() > 0) {
        Element new_associations_element = (Element) new_associations_elements_nodelist.item(0);

        // Add the legacy Entries to the Associations element
        for (int i = 0; i < old_entry_elements_nodelist.getLength(); i++) {
            Element old_entry_element = (Element) old_entry_elements_nodelist.item(i);
            new_associations_element.appendChild(new_document.importNode(old_entry_element, true));
        }
        }
    }

    // Write out the updated config.xml file
    XMLTools.writeXMLFile(config_xml_file, new_document);
    return true;
    }


    /** Add a special directory mapping. */
    static public boolean addDirectoryMapping(String name, File file) {
    boolean result = false;
    try {
        // Ensure the name isn't already in use.
        boolean found = false;
        NodeList mappings = directory_mappings_element.getElementsByTagName(StaticStrings.MAPPING_ELEMENT);
        for(int i = 0; !found && i < mappings.getLength(); i++) {
        Element mapping_element = (Element) mappings.item(i);
        if(mapping_element.getAttribute(StaticStrings.NAME_ATTRIBUTE).equalsIgnoreCase(name)) {
            found = true;
        }
        mapping_element = null;
        }
        // Otherwise add the mapping.
        if(!found) {
        Element mapping_element = general_config.createElement(StaticStrings.MAPPING_ELEMENT);
        mapping_element.setAttribute(StaticStrings.NAME_ATTRIBUTE, name);
        mapping_element.setAttribute(StaticStrings.FILE_ATTRIBUTE, file.toString());
        directory_mappings_element.appendChild(mapping_element);
        result = true;
        mapping_element = null;
        }
        mappings = null;
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return result;
    } /** addDirectoryMapping(String name, String file) **/

    /** The default get action retrieves the named property from the desired configuration, and returns a true or false. */
    static public boolean get(String property, boolean general) {
    String raw = getString(property, general);
    return (raw != null && raw.equalsIgnoreCase("true"));
    }

    /** Retrieve all of the configuration preferences which match a certain string. They are returned as a hash map of property names to String objects. */
    static public HashMap getAll(String property_pattern, boolean general) {
    HashMap properties = new HashMap();
    try {
        // Locate the appropriate element
        Element document_element = null;
        if(general) {
        document_element = general_config.getDocumentElement();
        }
        else if(collection_config != null) {
        document_element = collection_config.getDocumentElement();
        }
        if(document_element != null) {
        // Retrieve the Gatherer element
        Element gatherer_element = (Element) XMLTools.getNodeFromNamed(document_element, GATHERER_CONFIG);
        NodeList arguments = gatherer_element.getElementsByTagName(GATHERER_CONFIG_ARGUMENT);
        for(int i = 0; i < arguments.getLength(); i++) {
            Element argument_element = (Element) arguments.item(i);
            if(argument_element.getAttribute(ARGUMENT_NAME).matches(property_pattern)) {
            String result = XMLTools.getValue(argument_element);
            // Store a mapping in the cache. Sometimes we will overwrite an existing value (say for collection and general level workflow options) but the processing overhead of detecting these clashes far exceeds any savings.
            self.put(argument_element.getAttribute(ARGUMENT_NAME) + general, new SoftReference(argument_element));
            // Add mapping to the properties we're going to return
            properties.put(argument_element.getAttribute(ARGUMENT_NAME), result);
            }
        }
        }
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return properties;
    }

    /** Retrieve the information subtree containing the arguments for the desired external program. If the program has marked superclasses append their arguments as well. */
    static public Element getArguments(String filename) {
    Element argument_element = null;
    try {
        // Retrieve the other information subtree.
        Element document_element = general_config.getDocumentElement();
        Element other_element = (Element) XMLTools.getNodeFromNamed(document_element, OTHER);
        NodeList argument_elements = other_element.getElementsByTagName(OTHER_INFO);
        for(int i = 0; argument_element == null && i < argument_elements.getLength(); i++) {
        Element possible_element = (Element) argument_elements.item(i);
        Element possible_name_element = (Element) XMLTools.getNodeFromNamed(possible_element, NAME);
        String possible_name = XMLTools.getValue(possible_name_element);
        ///ystem.err.println("Does " + possible_name + " equal " + filename);
        if(possible_name.equalsIgnoreCase(filename)) {
            argument_element = possible_element;
        }
        possible_name = null;
        possible_name_element = null;
        possible_element = null;
        }
        argument_elements = null;
        other_element = null;
        document_element = null;
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return argument_element;
    }

    /** Gets the language for the other arguments subtree 
     @return empty string if no language specified */
    static public String getArgumentsLanguage() {
    Element document_element = general_config.getDocumentElement();
    Element other_element = (Element) XMLTools.getNodeFromNamed(document_element, OTHER);
    String lang = other_element.getAttribute(LANGUAGE);
    if (lang == null) {
        lang = "en";
    }
    return lang;
    }

    /** Retrieve the value of the named property as a Rectangle. */
    static public Rectangle getBounds(String property, boolean general) {
    Rectangle result = null;
    try {
        String raw = getString(property, general);
        // Rectangle is (x, y, width, height)
        StringTokenizer tokenizer = new StringTokenizer(raw, TOKENIZER_PATTERN1);
        int x = Integer.parseInt(tokenizer.nextToken());
        int y = Integer.parseInt(tokenizer.nextToken());
        int width = Integer.parseInt(tokenizer.nextToken());
        int height = Integer.parseInt(tokenizer.nextToken());
        result = new Rectangle(x, y, width, height);
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return result;
    }

    /** Retrieve the value of the named property as a Color. */
    static public Color getColor(String property, boolean general) {
    Color result = Color.white; // Default
    try {
        String raw = getString(property, general);
        // Color is a RGB triplet list, comma separated (also remove whitespace)
        StringTokenizer tokenizer = new StringTokenizer(raw, TOKENIZER_PATTERN1);
        int red = Integer.parseInt(tokenizer.nextToken());
        int green = Integer.parseInt(tokenizer.nextToken());
        int blue = Integer.parseInt(tokenizer.nextToken());
        result = new Color(red, green, blue);
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return result;
    }


    /** Retrieve the special directory mappings associated with this collection.
     * @return A <strong>HashMap</strong> containing mappings from names to directories.
     */
    static public HashMap getDirectoryMappings() {
    HashMap special_directories = new HashMap();
    try {
        // Ensure the name isn't already in use.
        boolean found = false;
        NodeList mappings = directory_mappings_element.getElementsByTagName(StaticStrings.MAPPING_ELEMENT);
        for(int i = 0; !found && i < mappings.getLength(); i++) {
        Element mapping_element = (Element) mappings.item(i);
        String name = mapping_element.getAttribute(StaticStrings.NAME_ATTRIBUTE);
        File file = new File(mapping_element.getAttribute(StaticStrings.FILE_ATTRIBUTE));
        special_directories.put(name, file);
        file = null;
        name = null;
        mapping_element = null;
        }
        mappings = null;
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return special_directories;
    } /** getDirectoryMappings() */

    /** Retrieve the current users email. These are always stored in the general settings.
     * @return the email address, if it is set, as a String
     */
    static public String getEmail() {
    String email = getString(GENERAL_EMAIL_SETTING, true);
    return (email.length() > 0 ? email : null);
    }

    static public Element getFileAssociations() {
    NodeList file_association_elements = general_config.getDocumentElement().getElementsByTagName(StaticStrings.ASSOCIATIONS_ELEMENT);
    return (Element) file_association_elements.item(0);
    }

    /** Retrieve the value of the named property as a FontUIResource. */
    static public FontUIResource getFont(String property, boolean general) {
    FontUIResource result = new FontUIResource("Times New Roman", Font.PLAIN, 10);
    try {
        String raw = getString(property, general);
        // Font is a face, style, size triplet.
        StringTokenizer tokenizer = new StringTokenizer(raw, TOKENIZER_PATTERN3);
        String face = tokenizer.nextToken().trim();
        ///ystem.err.println("Face:  " + face);
        int style = Font.PLAIN;
        String temp = tokenizer.nextToken().toUpperCase().trim();
        ///ystem.err.println("Style: " + temp);
        if(temp.equals("BOLD")) {
        style = Font.BOLD;
        }
        else if(temp.equals("ITALIC")) {
        style = Font.ITALIC;
        }
        int size = Integer.parseInt(tokenizer.nextToken().trim());
        ///ystem.err.println("Size:  " + size);
        result = new FontUIResource(face, style, size);
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return result;
    }

    /** Retrieve the value of the named property as an integer. */
    static public int getInt(String property, boolean general) {
    int result = 0;
    try {
        String raw = getString(property, general);
        result = Integer.parseInt(raw);
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return result;
    }

    /** Retrieves the current interface language two letter code. */
    static public String getLanguage() {
    Locale locale = getLocale("general.locale", GENERAL_SETTING);
    String code = "en"; // Default
    if(locale != null) {
        code = locale.getLanguage();
    }
    return code;
    }

    /** Retrieve the value of the named property as a Locale. */
    static public Locale getLocale(String property, boolean general) {
    Locale result = Locale.getDefault();
    try {
        String raw = getString(property, general);
        // Locale is a underscore separated code.
        StringTokenizer tokenizer = new StringTokenizer(raw, TOKENIZER_PATTERN2);
        String language = tokenizer.nextToken();
        if(tokenizer.hasMoreTokens()) {
        String country = tokenizer.nextToken();
        result = new Locale(language, country);
        }
        else {
        result = new Locale(language);
        }
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return result;
    }

    /** Because modes will soon be an integral part of GLI, they get their own easy to remember methods such as this one to get the mode.
     * @return an int representing the mode
     */
    static public int getMode() {
    return getInt("general.mode", GENERAL_SETTING);
    }

    /** Return the current mode as a string for use in title bar etc
     * @return the mode as a String
     */
    static public String getModeAsString() {
    String result;
    switch(getInt("general.mode", GENERAL_SETTING)) {
    case ASSISTANT_MODE:
        result = Dictionary.get("Preferences.Mode.Assistant");
        break;
    case SYSTEMS_MODE:
        result = Dictionary.get("Preferences.Mode.Systems");
        break;
    case EXPERT_MODE:
        result = Dictionary.get("Preferences.Mode.Expert");
        break;
    default:
        result = Dictionary.get("Preferences.Mode.Librarian");
    }
    return result;
    }

    static public String getPreviewCommand() {
    return getString("general.preview_program", GENERAL_SETTING);
    }

    static public String getServletPath() {
    return servlet_path;
    }

    /** Retrieve the value of the named property, and noting whether we consult the general or collection specific configuration. */
    static public String getString(String property, boolean general) {
    // Its up to this method to find the appropriate node and retrieve the data itself.
    String result = "";
    try {
        // First of all we look in the cache to see if we have a match.
        SoftReference reference = (SoftReference) self.get(property + general);
        if(reference != null) {
        Element argument_element = (Element) reference.get();
        if(argument_element != null) {
            cache_hit++;
            result = XMLTools.getValue(argument_element);
        }
        }
        // We may have missed in the cache, or the reference may have been consumed.
        if(result.length() == 0) {
        cache_miss++;
        // Locate the appropriate element
        Element document_element = null;
        if(general) {
            document_element = general_config.getDocumentElement();
        }
        else if(collection_config != null) {
            document_element = collection_config.getDocumentElement();
        }
        if(document_element != null) {
            // Retrieve the Gatherer element
            Element gatherer_element = (Element) XMLTools.getNodeFromNamed(document_element, GATHERER_CONFIG);
            NodeList arguments = gatherer_element.getElementsByTagName(GATHERER_CONFIG_ARGUMENT);
            for(int i = 0; result.length() == 0 && i < arguments.getLength(); i++) {
            Element argument_element = (Element) arguments.item(i);
            if(argument_element.getAttribute(ARGUMENT_NAME).equalsIgnoreCase(property)) {
                result = XMLTools.getValue(argument_element);
                // Store a mapping in the cache. Sometimes we will overwrite an existing value (say for collection and general level workflow options) but the processing overhead of detecting these clashes far exceeds any savings.
                self.put(property + general, new SoftReference(argument_element));
            }
            }
        }
        }
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    // If we still have no result, and the search was made in the collection configuration, retrieve the general one instead.
    if(result.length() == 0 && !general) {
        result = getString(property, true);
    }
    return result;
    }

    static public String getGS3ScriptPath() {
    return gsdl3_src_path + "bin" + File.separator + "script" + File.separator;
    }

    static public String getWGetPath() {
    return (wget_path != null ? wget_path : "");
    }

    static public String getWGetVersion() {
    return (wget_version_str != null ? wget_version_str : StaticStrings.NO_WGET_STR);
    }

    /** Remove a previously defined special directory mapping.
     * @param name The name of the mapping to remove as a <strong>String</strong>.
     * @return The <strong>File</strong> of the mapping removed.
     */
    static public File removeDirectoryMapping(String name) {
    File file = null;
    try {
        // Ensure the name isn't already in use.
        boolean found = false;
        NodeList mappings = directory_mappings_element.getElementsByTagName(StaticStrings.MAPPING_ELEMENT);
        for(int i = 0; !found && i < mappings.getLength(); i++) {
        Element mapping_element = (Element) mappings.item(i);
        if(mapping_element.getAttribute(StaticStrings.NAME_ATTRIBUTE).equalsIgnoreCase(name)) {
            file = new File(XMLTools.getValue(mapping_element));
            directory_mappings_element.removeChild(mapping_element);
            found = true;
        }
        mapping_element = null;
        }
        mappings = null;
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    return file;
    } /** removeDirectoryMapping(String name) */

    /** Export the general configuration to file. */
    static public void save() {
    ///ystem.err.println("Hits " + cache_hit + " vs Misses " + cache_miss);
    // We first try exporting to a user specific place
    File user_config_xml = null;
    String config_xml_name = CONFIG_XML;
    if (gsdl3_path!=null) {
        config_xml_name = GS3_CONFIG_XML;
    }
    try {
        user_config_xml = new File(gli_user_directory_path + config_xml_name);
        ///ystem.err.println("Trying to save to: " + user_config_xml.getAbsolutePath());
        ///ystem.err.println("Writing.");
        user_config_xml.getParentFile().mkdirs();
        XMLTools.writeXMLFile(new File(user_config_xml.getAbsolutePath()), general_config);
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
        user_config_xml = null;
    }
    }

    /** Set the named property, from the specified configuration, using the given boolean value. */
    static public void set(String property, boolean general, boolean value) {
    if(property.startsWith("workflow")) {
        DebugStream.println("Set property: " + property + ", general=" + general + ", value=" + value);
    }
    setString(property, general, (value ? "true" : "false"));
    }

    /** Add a subtree of argument information to the other arguments part of the general configuration. This overwrites any such existing subtree. */
    static public void setArguments(Element arguments_element) {
    try {
        Element document_element = general_config.getDocumentElement();
        Element other_element = (Element) XMLTools.getNodeFromNamed(document_element, OTHER);
        // Retrieve the name of the information
        Element arguments_name_element = (Element)XMLTools.getNodeFromNamed(arguments_element, NAME);
        String filename = XMLTools.getValue(arguments_element);
        // Find any argument information subtree starting with the same name
        Element obsolete_arguments_element = getArguments(filename);
        // Create a copy of the arguments_element within our tree (import).
        Element our_arguments_element = (Element) general_config.importNode(arguments_element, true);
        // Now we insert this new node into the tree. If a previous node exists we replace it instead.
        if(obsolete_arguments_element == null) {
        other_element.appendChild(our_arguments_element);
        }
        else {
        other_element.replaceChild(our_arguments_element, obsolete_arguments_element);
        }
        our_arguments_element = null;
        obsolete_arguments_element = null;
        filename = null;
        arguments_name_element = null;
        other_element = null;
        document_element = null;
    }
    catch (Exception exception) {
        DebugStream.println("Error in Configuration.setArguments(): " + exception);
        DebugStream.printStackTrace(exception);
    }
    }

    /** Sets the language for the other arguments subtree */
    static public void setArgumentsLanguage(String lang) {
    Element document_element = general_config.getDocumentElement();
    Element other_element = (Element) XMLTools.getNodeFromNamed(document_element, OTHER);
    other_element.setAttribute(LANGUAGE, lang);
    }

    
    /** Set the collection configuration. */
    static public void setCollectionConfiguration(Document collection_config) {
    // clear the cached values
    self.clear();
    collection_config = collection_config;
    updateUI();
    ///atherer.println("Collection configuration set.");
    }

    /** Set the named property, from the specified configuration, using the given Rectangle value. */
    static public void setBounds(String property, boolean general, Rectangle value) {
    StringBuffer text = new StringBuffer("");
    text.append(value.x);
    text.append(", ");
    text.append(value.y);
    text.append(", ");
    text.append(value.width);
    text.append(", ");
    text.append(value.height);
    setString(property, general, text.toString());
    }

    /** Set the named property, from the specified configuration, using the given Color value. */
    static public void setColor(String property, boolean general, Color value) {
    StringBuffer text = new StringBuffer("");
    text.append(value.getRed());
    text.append(", ");
    text.append(value.getGreen());
    text.append(", ");
    text.append(value.getBlue());
    setString(property, general, text.toString());
    }

    /** Establish the current users email.
     * @param email the email as a String
     */
    static public void setEmail(String email) {
    setString(GENERAL_EMAIL_SETTING, true, email);
    }

    /** Set the named property, from the specified configuration, using the given Font value. */
    static public void setFont(String property, boolean general, Font value) {
    StringBuffer text = new StringBuffer("");
    text.append(value.getName());
    text.append(", ");
    switch(value.getStyle()) {
    case Font.BOLD:
        text.append("BOLD");
        break;
    case Font.ITALIC:
        text.append("ITALIC");
        break;
    default:
        text.append("PLAIN");
    }
    text.append(", ");
    text.append(value.getSize());
    setString(property, general, text.toString());
    }

    /** Set the named property, from the specified configuration, using the given integer value. */
    static public void setInt(String property, boolean general, int value) {
        setString(property, general, String.valueOf(value));
    } 

    /** Set the named property, from the specified configuration, using the given Locale value. */
    static public void setLocale(String property, boolean general, Locale value) {
    StringBuffer text = new StringBuffer("");
    text.append(value.getLanguage());
    String country = value.getCountry();
    if(country != null && country.length() > 0) {
        text.append("_");
        text.append(country);
    }
    country = null;
    setString(property, general, text.toString());
    }

    /** Because modes will soon be an integral part of GLI, they get their own easy to remember methods such as this one to set the mode.
     * @param value the new value for mode
     */
    static public void setMode(int value) {
    setInt("general.mode", GENERAL_SETTING, value);
    }

    static public void setPreviewCommand(String value) {
    setString("general.preview_program", GENERAL_SETTING, value);
    }

    static public void setSiteAndServlet(String site, String servlet) {
    site_name = site;
    servlet_path = servlet;
    setString("general.site_name", GENERAL_SETTING, site);
    setString("general.servlet_path", GENERAL_SETTING, servlet);
    
    }
    /** Sets the value of the named property argument using the given string. */
    static public void setString(String property, boolean general, String value) {
    DebugStream.println("Set configuration property: " + property + " = " + value + (general ? "" : " [Collection]"));
    try {
        Document document = general_config;
        if(!general && collection_config != null) {
        document = collection_config;
        }
        if(document != null) {
        Element argument_element = null;
        // Try to retrieve from cache
        SoftReference reference = (SoftReference) self.get(property + general);
        if(reference != null) {
            argument_element = (Element) reference.get();
        }
        if(argument_element == null) {
            Element document_element = document.getDocumentElement();
            Element gatherer_element = (Element) XMLTools.getNodeFromNamed(document_element, GATHERER_CONFIG);
            NodeList arguments = document_element.getElementsByTagName(GATHERER_CONFIG_ARGUMENT);
            boolean found = false;
            for(int i = 0; argument_element == null && i < arguments.getLength(); i++) {
            Element possible_element = (Element) arguments.item(i);
            if(possible_element.getAttribute(ARGUMENT_NAME).equalsIgnoreCase(property)) {
                argument_element = possible_element;
            }
            }
            // If argument element is still null, create it in the target document.
            if(argument_element == null) {
            argument_element = document.createElement(GATHERER_CONFIG_ARGUMENT);
            argument_element.setAttribute(ARGUMENT_NAME, property);
            gatherer_element.appendChild(argument_element);
            }
            // Update cache
            self.put(property + general, new SoftReference(argument_element));

        }
        if(value == null) {
            value = "";
        }
        // Now remove any current text node children.
        NodeList children = argument_element.getChildNodes();
        for(int i = 0; i < children.getLength(); i++) {
            argument_element.removeChild(children.item(i));
        }
        // Add a new text node child with the new value
        argument_element.appendChild(document.createTextNode(value));
        }
    }
    catch (Exception exception) {
        DebugStream.printStackTrace(exception);
    }
    }

    static public void setWGetPath(String path) {
    wget_path  = path;
    }

    static public void setWGetVersion(String version) {
    wget_version_str = version;
    }

    static private void updateUI() {
    // Buttons
    UIManager.put("Button.select", new ColorUIResource(getColor("coloring.button_selected_background", false)));
    UIManager.put("Button.background", new ColorUIResource(getColor("coloring.button_background", false)));
    UIManager.put("Button.foreground", new ColorUIResource(getColor("coloring.button_foreground", false)));

    UIManager.put("ToggleButton.background", new ColorUIResource(getColor("coloring.button_background", false)));
    UIManager.put("ToggleButton.foreground", new ColorUIResource(getColor("coloring.button_foreground", false)));
    UIManager.put("ToggleButton.select", new ColorUIResource(getColor("coloring.button_selected_background", false)));

    // All the things with a lovely Collection green background
    UIManager.put("OptionPane.background", new ColorUIResource(getColor("coloring.collection_heading_background", false)));
    UIManager.put("Panel.background", new ColorUIResource(getColor("coloring.collection_heading_background", false)));
    UIManager.put("Label.background", new ColorUIResource(getColor("coloring.collection_heading_background", false)));
    UIManager.put("TabbedPane.background", new ColorUIResource(getColor("coloring.collection_heading_background", false)));
    UIManager.put("SplitPane.background", new ColorUIResource(getColor("coloring.collection_heading_background", false)));
    UIManager.put("CheckBox.background", new ColorUIResource(getColor("coloring.collection_heading_background", false)));


    // Editable coloring
    UIManager.put("ComboBox.background", new ColorUIResource(getColor("coloring.collection_tree_background", false))); // Indicate clickable
    UIManager.put("Tree.background", new ColorUIResource(getColor("coloring.collection_tree_background", false)));
    UIManager.put("Tree.textBackground", new ColorUIResource(getColor("coloring.collection_tree_background", false)));
    UIManager.put("ProgressBar.background", new ColorUIResource(getColor("coloring.collection_tree_background", false)));
    UIManager.put("TextArea.background", new ColorUIResource(getColor("coloring.collection_tree_background", false)));
    UIManager.put("TextField.background", new ColorUIResource(getColor("coloring.editable_background", false)));
    UIManager.put("Table.background", new ColorUIResource(getColor("coloring.collection_tree_background", false)));
    UIManager.put("List.background", new ColorUIResource(getColor("coloring.collection_tree_background", false)));
    UIManager.put("RadioButton.background", new ColorUIResource(getColor("coloring.collection_tree_background", false)));

    // Selection color
    UIManager.put("TabbedPane.selected", new ColorUIResource(getColor("coloring.collection_selection_background", false)));
    UIManager.put("Tree.selectionBackground", new ColorUIResource(getColor("coloring.collection_selection_background", false)));
    UIManager.put("ComboBox.selectionBackground", new ColorUIResource(getColor("coloring.collection_selection_background", false)));
    UIManager.put("ProgressBar.selectionBackground", new ColorUIResource(getColor("coloring.collection_selection_background", false)));
    UIManager.put("TextArea.selectionBackground", new ColorUIResource(getColor("coloring.collection_selection_background", false)));
    UIManager.put("TextField.selectionBackground", new ColorUIResource(getColor("coloring.collection_selection_background", false)));
    UIManager.put("List.selectionBackground", new ColorUIResource(getColor("coloring.collection_selection_background", false)));

    // Scroll bar stuff
    UIManager.put("ScrollBar.background", new ColorUIResource(getColor("coloring.scrollbar_background", false)));
    UIManager.put("ScrollBar.thumb", new ColorUIResource(getColor("coloring.scrollbar_foreground", false)));
    }
}