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) 2004 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.File;
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31 | import org.greenstone.gatherer.Configuration;
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32 | import org.greenstone.gatherer.util.XMLTools;
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33 | import org.greenstone.gatherer.util.StaticStrings;
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34 | import org.w3c.dom.*;
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35 |
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36 |
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37 | /** This class represents one Metadata element */
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38 | public class MetadataElement
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39 | {
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40 | // Language-independent metadata element name, with namespace (eg. dc.Subject)
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41 | private String metadata_element_name_full = null;
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42 | private Element metadata_element_element = null;
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43 | private MetadataValueTreeModel metadata_value_tree_model = null;
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44 | /* this is true if the metadata element comes with a pre defined set of values */
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45 | private boolean predefined_values = false;
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46 | /* This restricts the user to only the predefined values */
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47 | private boolean restricted_values = false;
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48 |
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49 | public MetadataElement(String metadata_element_name_full, Element metadata_element_element)
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50 | {
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51 | this.metadata_element_name_full = metadata_element_name_full;
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52 | this.metadata_element_element = metadata_element_element;
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53 | this.metadata_value_tree_model = new MetadataValueTreeModel(this);
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54 | if (metadata_element_element != null) {
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55 | if (metadata_element_element.getAttribute(StaticStrings.PREDEFINED_METADATA_ATTRIBUTE).equals("true")) {
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56 | predefined_values = true;
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57 | loadOptionList();
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58 | if (metadata_element_element.getAttribute(StaticStrings.RESTRICTED_METADATA_ATTRIBUTE).equals("true")) {
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59 | // cant have restricted values if no predefined values
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60 | restricted_values = true;
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61 | }
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62 | }
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63 | }
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64 | }
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65 |
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66 | // do this better
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67 | protected boolean loadOptionList() {
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68 | NodeList values = metadata_element_element.getElementsByTagName("Value");
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69 | for (int i=0; i<values.getLength(); i++) {
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70 | String val = XMLTools.getValue(values.item(i));
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71 | addMetadataValue(val);
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72 | }
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73 | return true;
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74 | }
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75 | public MetadataValueTreeNode addMetadataValue(String metadata_value)
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76 | {
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77 | return metadata_value_tree_model.addMetadataValue(metadata_value);
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78 | }
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79 |
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80 |
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81 | public String getAttribute(String attribute_name, String language_code)
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82 | {
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83 | // Some extracted metadata elements may not be in ex.mds, and so have no attributes
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84 | if (metadata_element_element == null) {
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85 | return null;
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86 | }
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87 |
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88 | Element parent_element = metadata_element_element;
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89 | boolean language_matches = false;
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90 |
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91 | NodeList language_elements_nodelist = metadata_element_element.getElementsByTagName("Language");
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92 | for (int i = 0; i < language_elements_nodelist.getLength(); i++) {
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93 | Element current_language_element = (Element) language_elements_nodelist.item(i);
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94 | String current_language_element_code = current_language_element.getAttribute("code");
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95 | if (current_language_element_code.equals(language_code)) {
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96 | // Found language; use it for the next step
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97 | parent_element = current_language_element;
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98 | language_matches = true;
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99 | break;
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100 | }
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101 | }
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102 |
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103 | NodeList attribute_elements_nodelist = parent_element.getElementsByTagName("Attribute");
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104 | for (int i = 0; i < attribute_elements_nodelist.getLength(); i++) {
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105 | Element current_attribute_element = (Element) attribute_elements_nodelist.item(i);
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106 | String current_attribute_element_name = current_attribute_element.getAttribute("name");
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107 | if (!current_attribute_element_name.equals(attribute_name)) {
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108 | // Move on to the next Attribute element if the name doesn't match
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109 | continue;
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110 | }
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111 |
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112 | // Check if the language matches
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113 | String current_attribute_element_language = current_attribute_element.getAttribute("language");
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114 | if (language_matches || current_attribute_element_language.equals(language_code)) {
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115 | // Found attribute; returns its value
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116 | return XMLTools.getElementTextValue(current_attribute_element);
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117 | }
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118 | }
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119 |
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120 | return null;
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121 | }
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122 |
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123 |
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124 | /** Returns language-dependent metadata element name, with namespace (eg. dc.Subject and Keywords) */
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125 | public String getDisplayName()
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126 | {
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127 | // now we use label, previously we used identifier
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128 | String metadata_element_display_name = MetadataTools.getMetadataElementAttribute(this, "label", Configuration.getLanguage(), "en");
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129 | if (metadata_element_display_name == null) {
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130 | // try identifier
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131 | metadata_element_display_name = MetadataTools.getMetadataElementAttribute(this, "identifier", Configuration.getLanguage(), "en");
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132 | }
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133 | // Root case (no subelements)
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134 | if (metadata_element_name_full.indexOf(MetadataTools.SUBELEMENT_SEPARATOR) == -1) {
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135 | if (metadata_element_display_name != null) {
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136 | return getNamespace() + "." + metadata_element_display_name;
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137 | }
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138 |
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139 | return metadata_element_name_full;
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140 | }
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141 |
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142 | // Recursive case (hierarchical metadata elements)
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143 | else {
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144 | String parent_metadata_element_name_full = metadata_element_name_full.substring(0, metadata_element_name_full.lastIndexOf(MetadataTools.SUBELEMENT_SEPARATOR));
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145 | MetadataElement parent_metadata_element = MetadataTools.getMetadataElementWithName(parent_metadata_element_name_full);
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146 |
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147 | String parent_metadata_element_display_name = parent_metadata_element_name_full;
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148 | if (parent_metadata_element != null) {
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149 | parent_metadata_element_display_name = parent_metadata_element.getDisplayName();
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150 | }
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151 |
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152 | if (metadata_element_display_name != null) {
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153 | return parent_metadata_element_display_name + MetadataTools.SUBELEMENT_SEPARATOR + metadata_element_display_name;
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154 | }
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155 |
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156 | return parent_metadata_element_display_name + metadata_element_name_full.substring(parent_metadata_element_name_full.length());
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157 | }
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158 | }
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159 |
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160 |
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161 | public MetadataValueTreeModel getMetadataValueTreeModel()
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162 | {
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163 | return metadata_value_tree_model;
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164 | }
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165 |
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166 |
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167 | public MetadataValueTreeNode getMetadataValueTreeNode(String metadata_value)
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168 | {
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169 | return metadata_value_tree_model.getMetadataValueTreeNode(metadata_value);
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170 | }
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171 |
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172 |
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173 | /** Returns language-independent metadata element name, with namespace (eg. dc.Subject) */
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174 | public String getFullName()
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175 | {
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176 | return metadata_element_name_full;
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177 | }
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178 |
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179 |
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180 | public String getNamespace()
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181 | {
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182 | return MetadataTools.getMetadataSetNamespace(metadata_element_name_full);
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183 | }
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184 |
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185 |
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186 | /** Returns language-independent metadata element name, *without* namespace (eg. Subject) */
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187 | public String getName()
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188 | {
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189 | return MetadataTools.getMetadataElementName(metadata_element_name_full);
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190 | }
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191 |
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192 |
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193 | public boolean isExtractedMetadataElement()
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194 | {
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195 | return getNamespace().equals(MetadataSetManager.EXTRACTED_METADATA_NAMESPACE);
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196 | }
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197 |
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198 | public boolean isPredefined() {
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199 | return predefined_values;
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200 | }
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201 |
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202 | public boolean isRestricted() {
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203 | return restricted_values;
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204 | }
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205 |
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206 | public boolean isSubelement()
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207 | {
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208 | return (metadata_element_name_full.indexOf(MetadataTools.SUBELEMENT_SEPARATOR) != -1);
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209 | }
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210 |
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211 |
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212 | /** This is used to display the element in the metadata value table */
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213 | public String toString()
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214 | {
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215 | return getDisplayName();
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216 | }
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217 | }
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