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 org.greenstone.gatherer.Gatherer;
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30 | import org.greenstone.gatherer.util.StaticStrings;
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31 | import org.greenstone.gatherer.util.Troolean;
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32 | import org.greenstone.gatherer.util.XMLTools;
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33 | import org.w3c.dom.*;
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34 |
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35 |
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36 | /** This class encapsulates one subcollection entry in the collection configuration file.
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37 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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38 | * @version 2.4
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39 | */
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40 | public class Subcollection
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41 | implements Comparable, DOMProxyListEntry {
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42 | /** A <i>boolean</i> which is <i>true</i> if the condition is an include one, <i>false</i> otherwise. */
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43 | private Troolean include = new Troolean();
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44 | /** The DOM Element this Subcollection is based upon. */
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45 | private Element element = null;
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46 | /** A String containing a Perl expression which is used as the pattern by which to filter this subcollection. */
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47 | private String pattern = null;
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48 | /** A series of flags to be used when matching the expression. */
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49 | private String flags = null;
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50 | /** A String which is a unique identifier of a subcollection. */
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51 | private String name = null;
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52 | /** Either the fully qualified name of the metadata whose value should be matched against the given expression, or <i>null</i> if you wish to match against the file name. */
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53 | private String source = null;
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54 | private String text = null;
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55 |
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56 | /** Default constructor which should only be used during DOMProxyListModel initialization. */
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57 | public Subcollection() {
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58 | }
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59 |
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60 | /** Constructor for representing an existing assigned Subcollection.
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61 | * @param element the Element this subcollection is based upon
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62 | */
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63 | public Subcollection(Element element) {
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64 | this.element = element;
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65 | }
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66 |
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67 | /** Constructor for assigning a brand new Subcollection.
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68 | * @param name a unique identifier for this collection as a String
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69 | * @param include true if this the pattern should be an inclusion filter, false for exclusion
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70 | * @param source either the fully qualified name of an element as a String, or null to filter filenames
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71 | * @param pattern the matching pattern as a String
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72 | * @param flags any flags to use while matching, as a String
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73 | */
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74 | public Subcollection(String name, boolean include, String source, String pattern, String flags) {
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75 | // Cache the details
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76 | this.flags = flags;
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77 | this.include.set(include);
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78 | this.name = name;
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79 | this.pattern = pattern;
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80 | if(source != null) {
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81 | this.source = source;
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82 | }
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83 | else {
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84 | this.source = StaticStrings.FILENAME_STR;
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85 | }
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86 | // Create a new DOM Element with the appropriate attributes and text value
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87 | element = CollectionDesignManager.collect_config.document.createElement(StaticStrings.SUBCOLLECTION_ELEMENT);
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88 | element.setAttribute(StaticStrings.CONTENT_ATTRIBUTE, source);
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89 | element.setAttribute(StaticStrings.NAME_ATTRIBUTE, name);
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90 | element.setAttribute(StaticStrings.OPTIONS_ATTRIBUTE, flags);
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91 | element.setAttribute(StaticStrings.TYPE_ATTRIBUTE, (include ? StaticStrings.INCLUDE_STR : StaticStrings.EXCLUDE_STR));
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92 | XMLTools.setValue(element, pattern);
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93 | }
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94 |
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95 | /** Method to compare two subcollections.
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96 | * @param object he other subcollection to compare to, as an Object
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97 | * @return an int which is >0, 0, or <0 if this subcollection is before, equal to, or after the target object respectively.
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98 | */
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99 | public int compareTo(Object object) {
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100 | if(object == null) {
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101 | return -1;
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102 | }
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103 | return getName().compareTo(((Subcollection)object).getName());
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104 | }
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105 |
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106 | public DOMProxyListEntry create(Element element) {
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107 | return new Subcollection(element);
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108 | }
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109 |
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110 | /** Method to check two subcollections for equality.
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111 | * @param object the other subcollection to compare to, as an Object
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112 | * @return true if the subcollections are equal, false otherwise.
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113 | */
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114 | public boolean equals(Object object) {
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115 | return (compareTo(object) == 0);
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116 | }
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117 |
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118 | /** Retrieve the DOM Element this Subcollection is based upon.
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119 | * @return an Element
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120 | */
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121 | public Element getElement() {
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122 | return element;
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123 | }
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124 |
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125 | /** Method to get the value of flags.
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126 | * @return the value of flags as a String
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127 | */
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128 | public String getFlags() {
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129 | if(flags == null && element != null) {
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130 | flags = element.getAttribute(StaticStrings.OPTIONS_ATTRIBUTE);
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131 | }
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132 | return flags;
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133 | }
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134 |
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135 | /** Method to get the value of name.
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136 | * @return String The value of name as a <strong>String</string>.
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137 | */
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138 | public String getName() {
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139 | if(name == null && element != null) {
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140 | name = element.getAttribute(StaticStrings.NAME_ATTRIBUTE);
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141 | }
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142 | return name;
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143 | }
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144 |
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145 | public String getPattern() {
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146 | if(pattern == null && element != null) {
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147 | pattern = XMLTools.getValue(element);
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148 | }
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149 | return pattern;
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150 | }
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151 |
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152 | /** Method to get the name of the source of the strings used in pattern matching.
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153 | * @return a String which is either the fully qualified name of a metadata element, or filename
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154 | */
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155 | public String getSource()
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156 | {
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157 | if (source == null && element != null) {
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158 | source = element.getAttribute(StaticStrings.CONTENT_ATTRIBUTE);
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159 | }
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160 |
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161 | return source;
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162 | }
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163 |
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164 | public boolean isAssigned() {
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165 | return (element != null && !element.getAttribute(CollectionConfiguration.ASSIGNED_ATTRIBUTE).equals(CollectionConfiguration.FALSE_STR));
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166 | }
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167 |
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168 | /** Method to get the value of include.
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169 | * @return boolean true if this is an inclusion filter, false otherwise
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170 | */
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171 | public boolean isInclusive() {
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172 | if(!include.isDecided() && element != null) {
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173 | include.set(element.getAttribute(StaticStrings.TYPE_ATTRIBUTE).equals(StaticStrings.INCLUDE_STR));
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174 | }
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175 | return include.isTrue();
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176 | }
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177 |
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178 | public void setAssigned(boolean assigned) {
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179 | if(element != null) {
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180 | element.setAttribute(CollectionConfiguration.ASSIGNED_ATTRIBUTE, (assigned ? CollectionConfiguration.TRUE_STR : CollectionConfiguration.FALSE_STR));
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181 | }
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182 | }
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183 |
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184 | public void setElement(Element element) {
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185 | this.element = element;
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186 | include.reset();
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187 | flags = null;
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188 | name = null;
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189 | pattern = null;
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190 | source = null;
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191 | text = null;
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192 | }
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193 |
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194 | public void setFlags(String new_flags) {
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195 | if(element != null) {
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196 | // Change element
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197 | element.setAttribute(StaticStrings.OPTIONS_ATTRIBUTE, new_flags);
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198 | flags = new_flags;
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199 | text = null;
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200 | }
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201 | }
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202 |
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203 | public void setInclusive(boolean new_include) {
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204 | if(element != null) {
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205 | // Change element
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206 | element.setAttribute(StaticStrings.TYPE_ATTRIBUTE, (new_include ? StaticStrings.INCLUDE_STR : StaticStrings.EXCLUDE_STR));
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207 | include.set(new_include);
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208 | text = null;
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209 | }
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210 | }
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211 |
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212 | public void setName(String new_name) {
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213 | if(element != null) {
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214 | // Change element
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215 | element.setAttribute(StaticStrings.NAME_ATTRIBUTE, new_name);
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216 | name = new_name;
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217 | text = null;
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218 | }
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219 | }
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220 |
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221 | public void setPattern(String new_pattern) {
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222 | if(element != null) {
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223 | // Change element
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224 | XMLTools.setValue(element, new_pattern);
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225 | pattern = new_pattern;
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226 | text = null;
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227 | }
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228 | }
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229 |
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230 | public void setSource(String new_source) {
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231 | if(element != null) {
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232 | // Change element
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233 | element.setAttribute(StaticStrings.CONTENT_ATTRIBUTE, new_source);
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234 | source = new_source;
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235 | text = null;
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236 | }
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237 | }
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238 |
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239 | /** Method to display the contents of this class as it would appear in the collection configuration file.
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240 | * @return a String representing this subcollection
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241 | */
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242 | public String toString() {
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243 | if(text == null && element != null) {
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244 | text = CollectionConfiguration.toString(element, true);
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245 | }
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246 | return text;
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247 | }
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248 | }
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