1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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9 | *
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10 | * Copyright (C) 1999 New Zealand Digital Library Project
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *########################################################################
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26 | */
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27 | package org.greenstone.gatherer.cdm;
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28 |
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29 | import java.util.*;
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30 | import org.greenstone.gatherer.DebugStream;
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31 | import org.greenstone.gatherer.Gatherer;
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32 | import org.greenstone.gatherer.metadata.MetadataElement;
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33 | import org.greenstone.gatherer.metadata.MetadataTools;
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34 | import org.greenstone.gatherer.util.StaticStrings;
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35 | import org.greenstone.gatherer.util.XMLTools;
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36 | import org.w3c.dom.*;
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37 |
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38 | /** This class encapsulates a single index. MGPP/Lucene/SOLR
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39 | * Can be subclassed for Sort fields and facet fields
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40 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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41 | * @version 2.3d
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42 | */
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43 | public class Index
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44 | implements Comparable, DOMProxyListEntry {
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45 |
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46 | protected ArrayList sources = null;
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47 |
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48 | /** The element this index is based upon. */
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49 | protected Element element = null;
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50 | /** The name for our elements */
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51 | static final String index_element = StaticStrings.INDEX_ELEMENT;
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52 | /** The name for the default element */
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53 | static final String default_index_element = StaticStrings.INDEX_DEFAULT_ELEMENT;
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54 | /** The unique, if cryptic, identifier of an index. */
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55 | protected String id = null;
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56 |
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57 | /** Default constructor, which should only be used during DOMProxyListModel creation. */
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58 | public Index() {
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59 | }
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60 |
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61 | /** Constructor. */
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62 | public Index(Element element) {
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63 | this.element = element;
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64 | }
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65 |
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66 | /** Constructor for a newly assigned index. */
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67 | public Index(ArrayList sources) {
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68 | this.sources = sources;
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69 | // Create a new element
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70 | this.element = CollectionConfiguration.createElement(getElementName());
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71 | // For each source add a content element
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72 | int size = sources.size();
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73 | for(int i = 0; i < size; i++) {
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74 | Element content_element = CollectionConfiguration.createElement(StaticStrings.CONTENT_ELEMENT);
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75 | Object source_object = sources.get(i);
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76 | if (source_object instanceof MetadataElement) {
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77 | // System.err.println("Constructing new Index with MetadataElement source...");
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78 | content_element.setAttribute(StaticStrings.NAME_ATTRIBUTE, ((MetadataElement) source_object).getFullName());
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79 | }
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80 | else {
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81 | // System.err.println("Constructing new Index with String source...");
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82 | content_element.setAttribute(StaticStrings.NAME_ATTRIBUTE, source_object.toString());
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83 | }
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84 | element.appendChild(content_element);
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85 | content_element = null;
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86 | }
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87 | }
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88 |
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89 | protected String getElementName() {
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90 | return index_element;
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91 | }
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92 |
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93 | protected String getDefaultElementName() {
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94 | return default_index_element;
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95 | }
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96 |
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97 | /** Method to compare two indexes.
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98 | * @param object The other index as an <strong>Object</strong>.
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99 | * @return An <i>int</i> which indicates how the indexes compare.
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100 | * @see java.lang.String
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101 | */
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102 | public int compareTo(Object object) {
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103 | if(object == null) {
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104 | return -1;
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105 | }
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106 | String id = getID();
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107 | return id.compareTo(((Index)object).getID());
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108 | }
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109 |
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110 | public DOMProxyListEntry create(Element element) {
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111 | return new Index(element);
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112 | }
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113 | public DOMProxyListEntry create(ArrayList sources) {
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114 | return new Index(sources);
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115 | }
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116 |
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117 | /** Method to test for the equality of two indexes.
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118 | * @param object The other index as an <strong>Object</strong>.
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119 | * @return A <i>boolean</i> which is <i>true</i> if the two indexes are equal, <i>false</i> otherwise.
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120 | */
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121 | public boolean equals(Object object) {
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122 | return (compareTo(object) == 0);
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123 | }
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124 |
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125 | public Element getElement() {
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126 | return element;
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127 | }
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128 |
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129 | public String getID() {
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130 | if(element == null) {
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131 | id="";
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132 | }
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133 | else if(id == null) {
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134 | StringBuffer id_buffer = new StringBuffer();
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135 | // Write data information. Retrieve each of the content sources and add them in a comma separated list.
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136 | ArrayList sources = getSources();
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137 | int sources_size = sources.size();
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138 | for(int i = 0; i < sources_size; i++) {
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139 | Object source_object = sources.get(i);
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140 | if (source_object instanceof MetadataElement) {
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141 | String full_element_name = ((MetadataElement)source_object).getFullName();
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142 | if(full_element_name.startsWith(StaticStrings.EXTRACTED_NAMESPACE) && full_element_name.indexOf(StaticStrings.NS_SEP, StaticStrings.EXTRACTED_NAMESPACE.length()) == -1) {
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143 | id_buffer.append(full_element_name.substring(StaticStrings.EXTRACTED_NAMESPACE.length()));
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144 | }
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145 | else {
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146 | id_buffer.append(full_element_name);
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147 | }
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148 | }
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149 | else {
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150 | id_buffer.append(source_object.toString());
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151 | }
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152 | id_buffer.append(StaticStrings.COMMA_CHARACTER);
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153 | }
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154 | sources = null;
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155 | if (id_buffer.length()==0) {
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156 | id = "";
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157 | } else {
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158 | id = id_buffer.substring(0, id_buffer.length() - 1);
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159 | }
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160 | }
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161 | return id;
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162 | }
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163 |
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164 |
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165 | /** Retrieve the sources of this index.
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166 | * @return the sources as an ArrayList
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167 | */
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168 | public ArrayList getSources() {
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169 | if(sources == null) {
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170 | sources = new ArrayList();
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171 | NodeList content_elements = element.getElementsByTagName(StaticStrings.CONTENT_ELEMENT);
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172 | int content_elements_length = content_elements.getLength();
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173 | for(int i = 0; i < content_elements_length; i++) {
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174 | Element content_element = (Element) content_elements.item(i);
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175 | String metadata_element_name_full = (String) content_element.getAttribute(StaticStrings.NAME_ATTRIBUTE);
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176 | MetadataElement metadata_element = MetadataTools.getMetadataElementWithName(metadata_element_name_full);
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177 | if (metadata_element != null) {
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178 | sources.add(metadata_element);
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179 | }
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180 | else {
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181 | sources.add(metadata_element_name_full);
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182 | }
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183 | }
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184 | content_elements = null;
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185 | }
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186 | return sources;
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187 | }
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188 | /** used for determining type of associated collection meta
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189 | * should be overridden by subclasses */
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190 | public String getType() {
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191 | return SearchMeta.TYPE_INDEX;
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192 | }
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193 | public boolean isAssigned() {
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194 | return (element != null && !element.getAttribute(StaticStrings.ASSIGNED_ATTRIBUTE).equals(StaticStrings.FALSE_STR));
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195 | }
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196 |
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197 | public void setAssigned(boolean assigned) {
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198 | if(element != null) {
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199 | element.setAttribute(StaticStrings.ASSIGNED_ATTRIBUTE, (assigned ? StaticStrings.TRUE_STR : StaticStrings.FALSE_STR));
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200 | }
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201 | }
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202 |
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203 | public void setElement(Element element) {
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204 | this.element = element;
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205 | this.id = null;
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206 | this.sources = null;
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207 | }
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208 |
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209 | /** Method to set the sources for this index which can only be used for the default index.
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210 | * @param sources an ArrayList of source names
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211 | */
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212 | public void setSources(ArrayList sources) {
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213 | if(element != null && element.getNodeName().equals(getDefaultElementName())) {
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214 | // Erase old sources
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215 | XMLTools.clear(element);
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216 | // For each entry in the sources array add a new content element.
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217 | int size = sources.size();
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218 | for(int i = 0; i < size; i++) {
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219 | Element content_element = element.getOwnerDocument().createElement(StaticStrings.CONTENT_ELEMENT);
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220 | Object source_object = sources.get(i);
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221 | if (source_object instanceof MetadataElement) {
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222 | String name = ((MetadataElement) source_object).getFullName();
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223 | content_element.setAttribute(StaticStrings.NAME_ATTRIBUTE, name);
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224 | name = null;
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225 | }
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226 | else {
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227 | //DebugStream.println("Found String as source: " + source_object.toString());
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228 | content_element.setAttribute(StaticStrings.NAME_ATTRIBUTE, source_object.toString());
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229 | }
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230 | source_object = null;
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231 | element.appendChild(content_element);
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232 | content_element = null;
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233 | }
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234 | this.id = null; // Regenerate ID.
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235 | this.sources = sources;
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236 | }
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237 | else {
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238 | DebugStream.println("Error! Called setSource() of index other than the default.");
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239 | }
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240 | }
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241 |
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242 | /** Method to turn this object into a string representation ready to be placed in the collection configuration file.
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243 | * @return A <strong>String</strong> containing the information of this class.
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244 | */
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245 | public String toString() {
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246 | StringBuffer text_buffer = new StringBuffer("");
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247 | // Generate language dependant id (include extracted metadata namespace)
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248 | // Write data information. Retrieve each of the content sources and add them in a comma separated list.
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249 | ArrayList sources = getSources();
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250 | int sources_size = sources.size();
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251 | for(int i = 0; i < sources_size; i++) {
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252 | String source_name = (sources.get(i)).toString();
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253 | text_buffer.append(source_name);
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254 | if(i < sources_size - 1) {
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255 | text_buffer.append(StaticStrings.COMMA_CHARACTER);
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256 | }
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257 | }
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258 | sources = null;
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259 | return text_buffer.toString();
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260 | }
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261 | }
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