source: gli/trunk/src/org/greenstone/gatherer/metadata/MetadataSetManager.java@ 19443

/**
 *############################################################################
 * A component of the Greenstone Librarian Interface, part of the Greenstone
 * digital library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: Michael Dewsnip, NZDL Project, University of Waikato, NZ
 *
 * Copyright (C) 2004 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.metadata;


import java.io.*;
import java.util.*;
import org.greenstone.gatherer.gui.MetadataImportMappingPrompt;


/** This class is a static class that manages the metadata sets */
public class MetadataSetManager
{
    static public final String EXTRACTED_METADATA_NAMESPACE = "ex";
    static public final String EXPLODED_METADATA_NAMESPACE = "exp";

    static private ArrayList metadata_sets = new ArrayList();


    static public void clearMetadataSets()
    {
    metadata_sets.clear();
    }


    static public int compareMetadataElements(MetadataElement metadata_element_a, MetadataElement metadata_element_b)
    {
    // First compare the namespaces of the two metadata elements
    if (!metadata_element_a.getNamespace().equals(metadata_element_b.getNamespace())) {
      if (metadata_element_a.getNamespace().equals(EXTRACTED_METADATA_NAMESPACE)) {
        return 1;
      }
      if (metadata_element_b.getNamespace().equals(EXTRACTED_METADATA_NAMESPACE)) {
        return -1;
      }
      return metadata_element_a.getNamespace().compareTo(metadata_element_b.getNamespace());
    }

    // Otherwise compare the two elements within the one set
    MetadataSet metadata_set = getMetadataSet(metadata_element_a.getNamespace());
    return metadata_set.compareMetadataElements(metadata_element_a, metadata_element_b);
    }


    static public ArrayList getEveryMetadataSetElement()
    {
    ArrayList every_metadata_set_element = new ArrayList();

    for (int i = 0; i < metadata_sets.size(); i++) {
        MetadataSet metadata_set = (MetadataSet) metadata_sets.get(i);
        every_metadata_set_element.addAll(metadata_set.getMetadataSetElements());
    }

    return every_metadata_set_element;
    }


    static public MetadataSet getMetadataSet(String metadata_set_namespace)
    {
    // Find the desired metadata set in the list
    for (int i = 0; i < metadata_sets.size(); i++) {
        MetadataSet metadata_set = (MetadataSet) metadata_sets.get(i);
        if (metadata_set.getNamespace().equals(metadata_set_namespace)) {
        return metadata_set;
        }
    }

    // Not found
    return null;
    }


    static public ArrayList getMetadataSets()
    {
    // We don't want anyone to modify the list, so return a copy of it
    return (ArrayList) metadata_sets.clone();
    }


    static public ArrayList listMetadataSets(File directory)
    {
    // Make sure the directory (metadata) exists
    if (directory.exists() == false) {
        return null;
    }

    // Load just those .mds files in this directory, and return them
    ArrayList directory_metadata_sets = new ArrayList();
    File[] directory_files = directory.listFiles();
    for (int i = 0; i < directory_files.length; i++) {
        File child_file = directory_files[i];
        if (!child_file.isDirectory() && child_file.getName().endsWith(".mds")) {
        MetadataSet metadata_set = new MetadataSet(child_file);
        directory_metadata_sets.add(metadata_set);
        }
    }

    return directory_metadata_sets;
    }


    static public void loadMetadataSets(File directory)
    {
    // Make sure the directory (metadata) exists
    if (directory.exists() == false) {
        return;
    }

    // Look recursively at each subfile of the directory for .mds files
    File[] directory_files = directory.listFiles();
    for (int i = 0; i < directory_files.length; i++) {
        File child_file = directory_files[i];
        if (child_file.isDirectory()) {
        loadMetadataSets(child_file);
        }
        else if (child_file.getName().endsWith(".mds")) {
        loadMetadataSet(child_file);
        }
    }
    }


    static public void loadMetadataSet(File metadata_set_file)
    {
    MetadataSet metadata_set = new MetadataSet(metadata_set_file);

    // Ignore legacy crap
    if (metadata_set.getNamespace().equals("hidden")) {
        return;
    }

    metadata_sets.add(metadata_set);
    }


    static public String mapUnloadedMetadataElement(String metadata_element_name_full)
    {
    // Check if we have an import mapping for this metadata element
    String target_metadata_element_name_full = ProfileXMLFileManager.getMetadataElementFor(metadata_element_name_full);
    if (target_metadata_element_name_full != null) {
        // Yes, so return it
        return target_metadata_element_name_full;
    }

    // If there are no metadata sets (except extracted) loaded then there is nothing to map the element into
    if (metadata_sets.size() <= 1) {
        return null;
    }

    // Ask the user how they want to deal with this element
    MetadataImportMappingPrompt metadata_import_mapping_prompt = new MetadataImportMappingPrompt(metadata_element_name_full);
    int result = metadata_import_mapping_prompt.getResult();

    // Add the element into an existing metadata set
    if (result == MetadataImportMappingPrompt.ADD_BUTTON_PRESSED) {
        MetadataSet target_metadata_set = metadata_import_mapping_prompt.getSelectedMetadataSet();
        String metadata_element_name = MetadataTools.getMetadataElementName(metadata_element_name_full);
        target_metadata_set.addMetadataElementForThisSession(metadata_element_name);
        target_metadata_element_name_full = target_metadata_set.getNamespace() + "." + metadata_element_name;
    }

    // Replace the element with an element in an existing metadata set
    if (result == MetadataImportMappingPrompt.MERGE_BUTTON_PRESSED) {
        MetadataElement target_metadata_element = metadata_import_mapping_prompt.getSelectedMetadataElement();
        target_metadata_element_name_full = target_metadata_element.getFullName();
    }

    // Ignore the element
    if (result == MetadataImportMappingPrompt.IGNORE_BUTTON_PRESSED) {
        target_metadata_element_name_full = "";
    }

    // Store this import mapping for future elements with the same name
    ProfileXMLFileManager.mapElement(metadata_element_name_full, target_metadata_element_name_full);

    return target_metadata_element_name_full;
    }


    static public void unloadMetadataSet(MetadataSet metadata_set)
    {
    // Find the metadata set in the list of loaded sets, and remove it
    for (int i = 0; i < metadata_sets.size(); i++) {
        if (metadata_set == (MetadataSet) metadata_sets.get(i)) {
        metadata_sets.remove(i);
        break;
        }
    }
    }
}