1 | /**
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2 | *############################################################################
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3 | * A component of the Greenstone Librarian Interface, part of the Greenstone
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4 | * digital library suite from the New Zealand Digital Library Project at the
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5 | * University of Waikato, New Zealand.
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6 | *
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7 | * Author: Michael Dewsnip, NZDL Project, University of Waikato, NZ
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8 | *
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9 | * Copyright (C) 2005 New Zealand Digital Library Project
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10 | *
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11 | * This program is free software; you can redistribute it and/or modify
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12 | * it under the terms of the GNU General Public License as published by
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13 | * the Free Software Foundation; either version 2 of the License, or
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14 | * (at your option) any later version.
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15 | *
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16 | * This program is distributed in the hope that it will be useful,
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | * GNU General Public License for more details.
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20 | *
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21 | * You should have received a copy of the GNU General Public License
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22 | * along with this program; if not, write to the Free Software
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23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | *############################################################################
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25 | */
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26 |
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27 | package org.greenstone.gatherer.metadata;
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28 |
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29 |
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30 | import java.io.*;
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31 | import java.util.*;
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32 | import org.greenstone.gatherer.DebugStream;
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33 | import org.greenstone.gatherer.Gatherer;
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34 | import org.greenstone.gatherer.collection.CollectionManager;
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35 | import org.greenstone.gatherer.collection.CollectionTreeNode;
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36 | import org.greenstone.gatherer.remote.RemoteGreenstoneServer;
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37 | import org.greenstone.gatherer.util.XMLTools;
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38 |
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39 | import org.greenstone.gatherer.util.Utility;
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40 |
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41 |
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42 | /** This class is a static class that manages the metadata.xml files */
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43 | public class MetadataXMLFileManager
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44 | {
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45 | static private ArrayList metadata_xml_files = new ArrayList();
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46 | /** The objects listening for MetadataChanged events. */
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47 | static private ArrayList metadata_changed_listeners = new ArrayList();
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48 | /** Keep track of which metadata.xml files have been modified so we can upload them to the server */
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49 | static private ArrayList modified_metadata_xml_files = new ArrayList();
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50 |
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51 | /** For non-accumulating metadata (gs.FilenameEncoding), need the metadata.xml files
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52 | * sorted in top-down folder level order, which is achieved through this Comparator.
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53 | * By declaring a static class member here, we avoid recreating this object for every
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54 | * comparison, which would otherwise have resulted in a constructor call each time. */
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55 | static private MetadataXMLFileComparator metadataXMLFileComparator = new MetadataXMLFileComparator();
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56 |
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57 |
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58 | static public void addMetadata(CollectionTreeNode file_node, ArrayList metadata_values)
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59 | {
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60 | addMetadata(new CollectionTreeNode[] { file_node }, metadata_values);
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61 | }
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62 |
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63 |
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64 | static public void addMetadata(CollectionTreeNode[] file_nodes, MetadataValue metadata_value)
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65 | {
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66 | ArrayList metadata_values = new ArrayList();
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67 | metadata_values.add(metadata_value);
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68 | addMetadata(file_nodes, metadata_values);
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69 | }
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70 |
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71 |
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72 | static public void addMetadata(CollectionTreeNode[] file_nodes, ArrayList metadata_values)
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73 | {
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74 | // Check the list of metadata values is non-empty
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75 | if (metadata_values.isEmpty()) {
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76 | return;
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77 | }
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78 |
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79 | // Add the metadata to each file node in turn
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80 | for (int i = 0; i < file_nodes.length; i++) {
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81 | File current_file = file_nodes[i].getFile();
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82 | DebugStream.println("Adding metadata to " + current_file.getAbsolutePath() + " - hex: " + Utility.debugUnicodeString(current_file.getAbsolutePath()));
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83 |
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84 | // Find which metadata.xml file needs editing
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85 | boolean applicable_metadata_xml_file_found = false;
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86 | File current_file_directory = (current_file.isDirectory() ? current_file : current_file.getParentFile());
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87 | String current_file_directory_path = current_file_directory.getAbsolutePath();
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88 | for (int j = 0; j < metadata_xml_files.size(); j++) {
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89 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(j);
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90 |
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91 | // This metadata.xml file is only applicable if it is at the same level as the file
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92 | if (current_file_directory_path.equals(metadata_xml_file.getParentFile().getAbsolutePath())) {
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93 | applicable_metadata_xml_file_found = true;
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94 | metadata_xml_file.addMetadata(file_nodes[i], metadata_values);
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95 | if (!modified_metadata_xml_files.contains(metadata_xml_file)) {
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96 | modified_metadata_xml_files.add(metadata_xml_file);
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97 | }
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98 | }
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99 | }
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100 |
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101 | // If no applicable metadata.xml file exists, we have to create a new one
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102 | if (!applicable_metadata_xml_file_found) {
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103 | // Create a new (empty) metadata.xml file in the file's directory...
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104 | File new_metadata_xml_file_file = new File(current_file_directory, "metadata.xml");
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105 | XMLTools.writeXMLFile(new_metadata_xml_file_file, XMLTools.parseXMLFile("xml/metadata.xml", true));
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106 |
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107 | // ...load it...
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108 | MetadataXMLFile new_metadata_xml_file = loadMetadataXMLFile(new_metadata_xml_file_file,true);
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109 |
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110 | // ...and add the metadata
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111 | new_metadata_xml_file.addMetadata(file_nodes[i], metadata_values);
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112 | if (!modified_metadata_xml_files.contains(new_metadata_xml_file)) {
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113 | modified_metadata_xml_files.add(new_metadata_xml_file);
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114 | }
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115 | }
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116 | }
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117 |
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118 | // Let any listeners know that the metadata has changed
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119 | fireMetadataChangedEvent(file_nodes);
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120 | }
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121 |
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122 |
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123 | static public void addMetadataChangedListener(MetadataChangedListener metadata_changed_listener)
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124 | {
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125 | metadata_changed_listeners.add(metadata_changed_listener);
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126 | }
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127 |
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128 |
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129 | static public void clearMetadataXMLFiles()
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130 | {
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131 | metadata_xml_files.clear();
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132 | }
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133 |
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134 |
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135 | static private void fireMetadataChangedEvent(CollectionTreeNode[] file_nodes)
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136 | {
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137 | // Send the event off to all the MetadataChangedListeners
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138 | for (int i = 0; i < metadata_changed_listeners.size(); i++) {
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139 | ((MetadataChangedListener) metadata_changed_listeners.get(i)).metadataChanged(file_nodes);
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140 | }
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141 | }
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142 |
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143 |
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144 | /** Returns the metadata assigned to a file outside the collection, excluding folder-level/inherited metadata. */
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145 | static public ArrayList getMetadataAssignedDirectlyToExternalFile(File file)
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146 | {
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147 | DebugStream.println("Getting metadata assigned directly to external file " + file + "...");
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148 |
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149 | // Build up a list of applicable metadata.xml files
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150 | ArrayList applicable_metadata_xml_files = new ArrayList();
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151 |
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152 | File directory = (file.isDirectory() ? file : file.getParentFile());
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153 | while (directory != null) {
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154 | File metadata_xml_file = new File(directory, "metadata.xml");
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155 | if (metadata_xml_file.exists() && !metadata_xml_file.isDirectory()) {
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156 | // It is very important that shallower files come before deeper ones
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157 | applicable_metadata_xml_files.add(0, new MetadataXMLFile(metadata_xml_file.getAbsolutePath()));
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158 | }
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159 |
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160 | directory = directory.getParentFile();
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161 | }
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162 |
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163 | // Get the metadata assigned to the specified file from the applicable metadata.xml files
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164 | ArrayList assigned_metadata = getMetadataAssignedToFile(file, applicable_metadata_xml_files, false);
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165 |
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166 | // Remove any folder-level metadata
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167 | for (int i = assigned_metadata.size() - 1; i >= 0; i--) {
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168 | if (((MetadataValue) assigned_metadata.get(i)).isInheritedMetadata()) {
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169 | assigned_metadata.remove(i);
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170 | }
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171 | }
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172 |
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173 | return assigned_metadata;
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174 | }
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175 |
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176 |
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177 | /** Returns the metadata assigned to a file inside the collection, excluding folder-level/inherited metadata. */
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178 | static public ArrayList getMetadataAssignedDirectlyToFile(File file)
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179 | {
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180 | return getMetadataAssignedDirectlyToFile(file, false);
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181 | }
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182 |
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183 | /** Returns the metadata assigned to a file inside the collection, excluding folder-level/inherited metadata. */
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184 | static public ArrayList getMetadataAssignedDirectlyToFile(File file, boolean filenameEncodingMetaOnly)
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185 | {
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186 |
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187 | // Get all the metadata assigned to the specified file...
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188 | ArrayList assigned_metadata = getMetadataAssignedToFile(file, filenameEncodingMetaOnly);
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189 |
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190 | // ...then remove any folder-level metadata
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191 | for (int i = assigned_metadata.size() - 1; i >= 0; i--) {
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192 | if (((MetadataValue) assigned_metadata.get(i)).isInheritedMetadata()) {
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193 | assigned_metadata.remove(i);
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194 | }
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195 | }
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196 |
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197 | return assigned_metadata;
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198 | /*
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199 | // Get all the metadata assigned to the specified file...
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200 | // Build up a list of applicable metadata.xml files - which in this case
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201 | // is exclusively the metadata file at this file/folder's own level.
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202 | ArrayList applicable_metadata_xml_files = new ArrayList();
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203 |
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204 | // Find the metadata.xml file (if any) that is at the same level as the file
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205 | String file_directory_path = (file.isDirectory() ? file : file.getParentFile()).getAbsolutePath() + File.separator;
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206 | for (int i = 0; i < metadata_xml_files.size(); i++) {
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207 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(i);
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208 |
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209 | if (file_directory_path.equals(metadata_xml_file.getParentFile().getAbsolutePath() + File.separator)) {
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210 | //System.err.println("Found metadata_xml_file: " + metadata_xml_file);
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211 | applicable_metadata_xml_files.add(metadata_xml_file);
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212 | }
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213 | }
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214 |
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215 | if(applicable_metadata_xml_files.size() == 0) {
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216 | return new ArrayList(0);
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217 | }
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218 |
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219 | // Return the metadata assigned to the specified file from the applicable metadata.xml files
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220 | return getMetadataAssignedToFile(file, applicable_metadata_xml_files, filenameEncodingMetaOnly);
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221 | */
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222 | }
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223 |
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224 |
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225 | /** Returns all the metadata assigned to a file inside the collection. */
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226 | static public ArrayList getMetadataAssignedToFile(File file)
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227 | {
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228 | return getMetadataAssignedToFile(file, false);
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229 | }
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230 |
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231 | /** Returns all the metadata assigned to a file inside the collection (or
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232 | * just gs.filenameEncoding if parameter filenameEncodingMetaOnly is true),
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233 | * including folder-level/inherited metadata.
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234 | */
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235 | static public ArrayList getMetadataAssignedToFile(File file, boolean filenameEncodingMetaOnly)
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236 | {
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237 | // Build up a list of applicable metadata.xml files
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238 | ArrayList applicable_metadata_xml_files = new ArrayList();
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239 |
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240 | // Look at each loaded metadata.xml file to see if it is potentially applicable
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241 | String file_directory_path = (file.isDirectory() ? file : file.getParentFile()).getAbsolutePath() + File.separator;
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242 | for (int i = 0; i < metadata_xml_files.size(); i++) {
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243 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(i);
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244 |
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245 | // This metadata.xml file is only potentially applicable if it is above or at the same level as the file
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246 | if (file_directory_path.startsWith(metadata_xml_file.getParentFile().getAbsolutePath() + File.separator)) {
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247 | applicable_metadata_xml_files.add(metadata_xml_file);
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248 | }
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249 | }
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250 |
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251 | // Sort the metadataxml files in order starting from those in the
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252 | // topmost folders down to the one in the lowest level folder.
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253 | Collections.sort(applicable_metadata_xml_files, metadataXMLFileComparator);
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254 | // Return the metadata assigned to the specified file from the applicable metadata.xml files
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255 | return getMetadataAssignedToFile(file, applicable_metadata_xml_files, filenameEncodingMetaOnly);
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256 | }
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257 |
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258 | // package access method
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259 | static ArrayList getMetadataAssignedToFile(File file, ArrayList applicable_metadata_xml_files,
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260 | boolean filenameEncodingMetaOnly)
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261 | {
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262 | // Build up a list of metadata values assigned to this file
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263 | ArrayList metadata_values_all = new ArrayList();
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264 |
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265 | // Look at each applicable metadata.xml file to see if it assigns metadata to this file
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266 | for (int i = 0; i < applicable_metadata_xml_files.size(); i++) {
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267 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) applicable_metadata_xml_files.get(i);
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268 | DebugStream.println("Applicable metadata.xml file: " + metadata_xml_file);
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269 |
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270 | ArrayList metadata_values = metadata_xml_file.getMetadataAssignedToFile(file, filenameEncodingMetaOnly);
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271 | for (int j = 0; j < metadata_values.size(); j++) {
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272 | MetadataValue metadata_value = (MetadataValue) metadata_values.get(j);
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273 |
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274 | // Overriding metadata: remove any values with this metadata element
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275 | if (metadata_value.isAccumulatingMetadata() == false) {
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276 | for (int k = metadata_values_all.size() - 1; k >= 0; k--) {
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277 | if (((MetadataValue) metadata_values_all.get(k)).getMetadataElement().equals(metadata_value.getMetadataElement())) {
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278 | metadata_values_all.remove(k);
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279 | }
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280 | }
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281 | }
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282 |
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283 | metadata_values_all.add(metadata_value);
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284 | }
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285 | }
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286 |
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287 | return metadata_values_all;
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288 | }
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289 |
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290 |
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291 | static public void loadMetadataXMLFiles(File directory, boolean skimfile)
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292 | {
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293 | // Make sure the directory (import) exists
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294 | if (directory.exists() == false) {
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295 | return;
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296 | }
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297 |
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298 | // Look recursively at each subfile of the directory for metadata.xml files
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299 | File[] directory_files = directory.listFiles();
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300 | for (int i = 0; i < directory_files.length; i++) {
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301 | File child_file = directory_files[i];
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302 | if (child_file.isDirectory()) {
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303 | loadMetadataXMLFiles(child_file,skimfile);
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304 | }
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305 | else if (child_file.getName().equals("metadata.xml")) {
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306 | loadMetadataXMLFile(child_file,skimfile);
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307 | }
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308 | }
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309 | }
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310 |
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311 |
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312 | static private MetadataXMLFile loadMetadataXMLFile(File metadata_xml_file_file, boolean skimfile)
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313 | {
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314 | MetadataXMLFile metadata_xml_file = new MetadataXMLFile(metadata_xml_file_file.getAbsolutePath());
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315 | if (metadata_xml_files.contains(metadata_xml_file)) {
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316 | // This metadata.xml file has already been loaded, so return the loaded object
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317 | return (MetadataXMLFile) metadata_xml_files.get(metadata_xml_files.indexOf(metadata_xml_file));
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318 | }
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319 | if(skimfile){
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320 | metadata_xml_file.skimFile();
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321 | }
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322 | metadata_xml_files.add(metadata_xml_file);
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323 | return metadata_xml_file;
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324 | }
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325 |
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326 |
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327 | static public void removeMetadata(CollectionTreeNode file_node, ArrayList metadata_values)
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328 | {
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329 | removeMetadata(new CollectionTreeNode[] { file_node }, metadata_values);
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330 | }
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331 |
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332 |
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333 | static public void removeMetadata(CollectionTreeNode[] file_nodes, MetadataValue metadata_value)
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334 | {
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335 | ArrayList metadata_values = new ArrayList();
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336 | metadata_values.add(metadata_value);
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337 | removeMetadata(file_nodes, metadata_values);
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338 | }
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339 |
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340 |
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341 | static public void removeMetadata(CollectionTreeNode[] file_nodes, ArrayList metadata_values)
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342 | {
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343 | // Check the list of metadata values is non-empty
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344 | if (metadata_values.isEmpty()) {
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345 | return;
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346 | }
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347 |
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348 | // Remove the metadata from each file node in turn
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349 | for (int i = 0; i < file_nodes.length; i++) {
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350 | File current_file = file_nodes[i].getFile();
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351 | DebugStream.println("Removing metadata from " + current_file.getAbsolutePath());
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352 |
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353 | // Find which metadata.xml file needs editing
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354 | File current_file_directory = (current_file.isDirectory() ? current_file : current_file.getParentFile());
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355 | String current_file_directory_path = current_file_directory.getAbsolutePath();
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356 | for (int j = 0; j < metadata_xml_files.size(); j++) {
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357 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(j);
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358 |
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359 | // This metadata.xml file is only potentially applicable if it is above or at the same level as the file
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360 | if (current_file_directory_path.startsWith(metadata_xml_file.getParentFile().getAbsolutePath())) {
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361 | metadata_xml_file.removeMetadata(file_nodes[i], metadata_values);
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362 | if (!modified_metadata_xml_files.contains(metadata_xml_file)) {
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363 | modified_metadata_xml_files.add(metadata_xml_file);
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364 | }
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365 | }
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366 | }
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367 | }
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368 |
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369 | // Let any listeners know that the metadata has changed
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370 | fireMetadataChangedEvent(file_nodes);
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371 | }
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372 |
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373 |
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374 | static public void removeMetadataChangedListener(MetadataChangedListener metadata_changed_listener)
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375 | {
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376 | metadata_changed_listeners.remove(metadata_changed_listener);
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377 | }
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378 |
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379 |
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380 | static public void replaceMetadata(CollectionTreeNode[] file_nodes, MetadataValue old_metadata_value, MetadataValue new_metadata_value)
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381 | {
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382 | // Replace the metadata in each file node in turn
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383 | for (int i = 0; i < file_nodes.length; i++) {
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384 | File current_file = file_nodes[i].getFile();
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385 | DebugStream.println("Replacing metadata in " + current_file.getAbsolutePath());
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386 |
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387 | // Find which metadata.xml file needs editing
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388 | File current_file_directory = (current_file.isDirectory() ? current_file : current_file.getParentFile());
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389 | String current_file_directory_path = current_file_directory.getAbsolutePath();
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390 | for (int j = 0; j < metadata_xml_files.size(); j++) {
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391 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(j);
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392 |
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393 | // This metadata.xml file is only applicable if it is at the same level as the file
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394 | if (current_file_directory_path.equals(metadata_xml_file.getParentFile().getAbsolutePath())) {
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395 | metadata_xml_file.replaceMetadata(file_nodes[i], old_metadata_value, new_metadata_value);
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396 | if (!modified_metadata_xml_files.contains(metadata_xml_file)) {
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397 | modified_metadata_xml_files.add(metadata_xml_file);
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398 | }
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399 | }
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400 | }
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401 | }
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402 |
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403 | // Let any listeners know that the metadata has changed
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404 | fireMetadataChangedEvent(file_nodes);
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405 | }
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406 |
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407 |
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408 | /** Ensures that all the metadata is written to metadata.xml files. */
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409 | static public void saveMetadataXMLFiles()
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410 | {
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411 | // Save the file currently loaded into memory out to disk
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412 | MetadataXMLFile.saveLoadedFile();
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413 |
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414 | // If the collection is stored on a remote server, upload all the modified files now
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415 | if (Gatherer.isGsdlRemote) {
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416 | if (modified_metadata_xml_files.isEmpty()) {
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417 | DebugStream.println("No modified metadata.xml files to upload.");
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418 | return;
|
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419 | }
|
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420 |
|
---|
421 | // Upload the files modified since last time, then reset the list
|
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422 | Gatherer.remoteGreenstoneServer.uploadCollectionFiles(
|
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423 | CollectionManager.getLoadedCollectionName(), (File[]) modified_metadata_xml_files.toArray(new File[0]));
|
---|
424 | modified_metadata_xml_files.clear();
|
---|
425 | }
|
---|
426 | }
|
---|
427 |
|
---|
428 |
|
---|
429 | static public void unloadMetadataXMLFile(File metadata_xml_file_file)
|
---|
430 | {
|
---|
431 | DebugStream.println("Unloading metadata.xml file " + metadata_xml_file_file);
|
---|
432 |
|
---|
433 | // Find the metadata.xml file in the list of loaded files, and remove it
|
---|
434 | for (int i = 0; i < metadata_xml_files.size(); i++) {
|
---|
435 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(i);
|
---|
436 | if (metadata_xml_file_file.getAbsolutePath().equals(metadata_xml_file.getAbsolutePath())) {
|
---|
437 | metadata_xml_files.remove(i);
|
---|
438 | break;
|
---|
439 | }
|
---|
440 | }
|
---|
441 | }
|
---|
442 |
|
---|
443 | static public void clearAllMetadataInCollection() {
|
---|
444 | for (int j = 0; j < metadata_xml_files.size(); j++) {
|
---|
445 | MetadataXMLFile metadata_xml_file = (MetadataXMLFile) metadata_xml_files.get(j);
|
---|
446 | metadata_xml_file.clearAllMetadataInFile();
|
---|
447 |
|
---|
448 | // Let any listeners know that the metadata has changed
|
---|
449 | //fireMetadataChangedEvent(file_nodes); // sadly don't have file_nodes needed to do this
|
---|
450 |
|
---|
451 | // all are modified
|
---|
452 | if (!modified_metadata_xml_files.contains(metadata_xml_file)) {
|
---|
453 | modified_metadata_xml_files.add(metadata_xml_file);
|
---|
454 | }
|
---|
455 | saveMetadataXMLFiles(); // saves final modified metaXML and then takes care of uploading all modified metaXML files to remote gsdl
|
---|
456 | }
|
---|
457 | }
|
---|
458 |
|
---|
459 | /**
|
---|
460 | * Comparator to order MetadataXMLFiles in ascending order from
|
---|
461 | * those in a higher level folder to those in a lower level folder
|
---|
462 | * It is based on the assumption that all MetadataXMLFiles sent to
|
---|
463 | * it to compare will be linear descendants of one toplevel folder
|
---|
464 | * E.g. /A/metadata.xml, /A/B/metadata.xml, /A/B/C/D/metadata.xml.
|
---|
465 | * In other words, that each is a substring of one of the others until
|
---|
466 | * the toplevel folder is reached.
|
---|
467 | */
|
---|
468 | private static class MetadataXMLFileComparator implements Comparator {
|
---|
469 |
|
---|
470 | public int compare(Object o1, Object o2) {
|
---|
471 | if(!(o1 instanceof MetadataXMLFile)) {
|
---|
472 | return -1;
|
---|
473 | } else if (!(o2 instanceof MetadataXMLFile)) {
|
---|
474 | return 1;
|
---|
475 | }
|
---|
476 |
|
---|
477 | // Both are MetadataXMLFiles objects. Remove the terminating
|
---|
478 | // "metadata.xml" from their filenames to get their containing folder
|
---|
479 | String filename1 = ((MetadataXMLFile)o1).getParentFile().getAbsolutePath();
|
---|
480 | String filename2 = ((MetadataXMLFile)o2).getParentFile().getAbsolutePath();
|
---|
481 |
|
---|
482 | // if 1 is a prefix of 2, then 1 < 2 in the ordering (1 comes before 2)
|
---|
483 | if(filename2.startsWith(filename1)) {
|
---|
484 | return -1;
|
---|
485 | } else if(filename1.startsWith(filename2)) {
|
---|
486 | return 1;
|
---|
487 | } else {
|
---|
488 | // unlikely that the metadata.xml files will be the same
|
---|
489 | // or that neither is a prefix of the other
|
---|
490 | return filename1.compareTo(filename2); // sorts in ascending order
|
---|
491 | }
|
---|
492 |
|
---|
493 | }
|
---|
494 |
|
---|
495 | public boolean equals(Object obj) {
|
---|
496 | if(!(obj instanceof MetadataXMLFileComparator)) {
|
---|
497 | return false;
|
---|
498 | }
|
---|
499 |
|
---|
500 | // else it is the same sort of comparator
|
---|
501 | return true;
|
---|
502 | }
|
---|
503 |
|
---|
504 | }
|
---|
505 |
|
---|
506 | }
|
---|