1 | /*
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2 | * AbstractGS2DocumentRetrieve.java
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3 | * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
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4 | *
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5 | * This program is free software; you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation; either version 2 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 | */
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19 | package org.greenstone.gsdl3.service;
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20 |
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21 | // Greenstone classes
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22 | import org.greenstone.gsdl3.core.GSException;
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23 | import org.greenstone.gsdl3.util.GSXML;
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24 | import org.greenstone.gsdl3.util.GSFile;
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25 | import org.greenstone.gsdl3.util.OID;
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26 | import org.greenstone.gsdl3.util.MacroResolver;
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27 | import org.greenstone.gsdl3.util.GS2MacroResolver;
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28 | import org.greenstone.gsdl3.util.GSConstants;
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29 | import org.greenstone.gsdl3.util.SimpleCollectionDatabase;
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30 | import org.greenstone.gsdl3.util.DBInfo;
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31 | // XML classes
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32 | import org.w3c.dom.Document;
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33 | import org.w3c.dom.Element;
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34 | import org.w3c.dom.NodeList;
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35 |
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36 | // General Java classes
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37 | import java.io.File;
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38 | import java.util.StringTokenizer;
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39 | import java.util.Vector;
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40 | import java.util.Set;
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41 | import java.util.Iterator;
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42 | import java.util.ArrayList;
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43 |
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44 | import org.apache.log4j.*;
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45 |
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46 | /** Implements the generic retrieval and classifier services for GS2
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47 | * collections.
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48 | *
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49 | * @author <a href="mailto:[email protected]">Katherine Don</a>
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50 | * @author <a href="mailto:[email protected]">Michael Dewsnip</a>
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51 | */
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52 |
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53 | public abstract class AbstractGS2DocumentRetrieve
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54 | extends AbstractDocumentRetrieve {
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55 |
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56 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.AbstractGS2DocumentRetrieve.class.getName());
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57 |
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58 | // protected static final String EXTLINK_PARAM = "ext"; here or in base??
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59 | protected String index_stem = null;
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60 |
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61 | protected SimpleCollectionDatabase coll_db = null;
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62 |
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63 |
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64 | /** constructor */
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65 | protected AbstractGS2DocumentRetrieve()
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66 | {
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67 | this.macro_resolver = new GS2MacroResolver();
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68 | }
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69 |
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70 | public void cleanUp() {
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71 | super.cleanUp();
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72 | this.coll_db.closeDatabase();
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73 | }
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74 | /** configure this service */
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75 | public boolean configure(Element info, Element extra_info)
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76 | {
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77 | if (!super.configure(info, extra_info)){
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78 | return false;
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79 | }
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80 |
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81 | logger.info("Configuring AbstractGS2DocumentRetrieve...");
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82 | //this.config_info = info;
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83 |
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84 | // the index stem is either specified in the config file or is the collection name
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85 | Element index_stem_elem = (Element) GSXML.getChildByTagName(info, GSXML.INDEX_STEM_ELEM);
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86 | if (index_stem_elem != null) {
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87 | this.index_stem = index_stem_elem.getAttribute(GSXML.NAME_ATT);
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88 | }
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89 | if (this.index_stem == null || this.index_stem.equals("")) {
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90 | logger.error("AbstractGS2DocumentRetrieve.configure(): indexStem element not found, stem will default to collection name");
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91 | this.index_stem = this.cluster_name;
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92 | }
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93 |
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94 | // find out what kind of database we have
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95 | Element database_type_elem = (Element) GSXML.getChildByTagName(info, GSXML.DATABASE_TYPE_ELEM);
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96 | String database_type = null;
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97 | if (database_type_elem != null) {
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98 | database_type = database_type_elem.getAttribute(GSXML.NAME_ATT);
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99 | }
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100 | if (database_type == null || database_type.equals("")) {
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101 | database_type = "gdbm"; // the default
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102 | }
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103 | coll_db = new SimpleCollectionDatabase(database_type);
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104 | if (coll_db == null) {
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105 | logger.error("Couldn't create the collection database of type "+database_type);
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106 | return false;
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107 | }
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108 |
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109 | // Open database for querying
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110 | String coll_db_file = GSFile.collectionDatabaseFile(this.site_home, this.cluster_name, this.index_stem, database_type);
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111 | if (!this.coll_db.openDatabase(coll_db_file, SimpleCollectionDatabase.READ)) {
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112 | logger.error("Could not open collection database!");
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113 | return false;
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114 | }
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115 |
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116 | // we need to set the database for our GS2 macro resolver
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117 | GS2MacroResolver gs2_macro_resolver = (GS2MacroResolver)this.macro_resolver;
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118 | gs2_macro_resolver.setDB(this.coll_db);
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119 |
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120 | return true;
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121 | }
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122 |
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123 | /** if id ends in .fc, .pc etc, then translate it to the correct id */
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124 | protected String translateId(String node_id) {
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125 | return this.coll_db.translateOID(node_id);
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126 | }
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127 |
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128 | /** if an id is not a greenstone id (an external id) then translate
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129 | it to a greenstone one*/
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130 | protected String translateExternalId(String node_id){
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131 | return this.coll_db.externalId2OID(node_id);
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132 | }
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133 |
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134 | /** returns the id of the root node of the document containing node node_id. . may be the same as node_id */
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135 | protected String getRootId(String node_id) {
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136 | return OID.getTop(node_id);
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137 | }
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138 | /** returns a list of the child ids in order, null if no children */
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139 | protected ArrayList getChildrenIds(String node_id) {
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140 | DBInfo info = this.coll_db.getInfo(node_id);
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141 | if (info == null) {
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142 | return null;
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143 | }
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144 |
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145 | String contains = info.getInfo("contains");
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146 | if (contains.equals("")) {
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147 | return null;
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148 | }
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149 | ArrayList children = new ArrayList();
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150 | StringTokenizer st = new StringTokenizer(contains, ";");
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151 | while (st.hasMoreTokens()) {
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152 | String child_id = st.nextToken().replaceAll("\"", node_id);
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153 | children.add(child_id);
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154 | }
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155 | return children;
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156 |
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157 | }
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158 | /** returns the node id of the parent node, null if no parent */
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159 | protected String getParentId(String node_id){
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160 | String parent = OID.getParent(node_id);
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161 | if (parent.equals(node_id)) {
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162 | return null;
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163 | }
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164 | return parent;
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165 | }
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166 |
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167 | /** get the metadata for the classifier node node_id
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168 | * returns a metadataList element:
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169 | * <metadataList><metadata name="xxx">value</metadata></metadataList>
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170 | */
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171 | // assumes only one value per metadata
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172 | protected Element getMetadataList(String node_id, boolean all_metadata,
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173 | ArrayList metadata_names)
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174 | throws GSException {
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175 | Element metadata_list = this.doc.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
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176 | DBInfo info = this.coll_db.getInfo(node_id);
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177 | if (info == null) {
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178 | return null;
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179 | }
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180 | String lang = "en"; // why do we need this??
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181 | if (all_metadata) {
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182 | // return everything out of the database
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183 | Set keys = info.getKeys();
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184 | Iterator it = keys.iterator();
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185 | while(it.hasNext()) {
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186 | String key = (String)it.next();
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187 | //String value = info.getInfo(key);
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188 | Vector values = info.getMultiInfo(key);
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189 | for(int i=0; i<values.size(); i++) {
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190 | GSXML.addMetadata(this.doc, metadata_list, key, this.macro_resolver.resolve((String)values.elementAt(i), lang, MacroResolver.SCOPE_META, node_id));
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191 | }
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192 | }
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193 |
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194 | } else {
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195 | for (int i=0; i<metadata_names.size(); i++) {
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196 | String meta_name = (String) metadata_names.get(i);
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197 | String value = getMetadata(node_id, info, meta_name, lang);
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198 | GSXML.addMetadata(this.doc, metadata_list, meta_name, value);
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199 | }
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200 | }
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201 | return metadata_list;
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202 | }
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203 |
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204 | /** returns the structural information asked for.
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205 | * info_type may be one of
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206 | * INFO_NUM_SIBS, INFO_NUM_CHILDREN, INFO_SIB_POS
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207 | */
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208 | protected String getStructureInfo(String doc_id, String info_type) {
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209 | String value="";
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210 | if (info_type.equals(INFO_NUM_SIBS)) {
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211 | String parent_id = OID.getParent(doc_id);
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212 | if (parent_id.equals(doc_id)) {
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213 | value="0";
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214 | } else {
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215 | value = String.valueOf(getNumChildren(parent_id));
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216 | }
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217 | return value;
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218 | }
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219 |
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220 | if (info_type.equals(INFO_NUM_CHILDREN)) {
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221 | return String.valueOf(getNumChildren(doc_id));
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222 | }
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223 |
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224 |
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225 | if (info_type.equals(INFO_SIB_POS)) {
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226 | String parent_id = OID.getParent(doc_id);
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227 | if (parent_id.equals(doc_id)) {
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228 | return "-1";
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229 | }
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230 |
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231 | DBInfo info = this.coll_db.getInfo(parent_id);
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232 | if (info==null) {
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233 | return "-1";
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234 | }
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235 |
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236 | String contains = info.getInfo("contains");
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237 | contains = contains.replaceAll("\"", parent_id);
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238 | String [] children = contains.split(";");
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239 | for (int i=0;i<children.length;i++) {
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240 | String child_id = children[i];
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241 | if (child_id.equals(doc_id)) {
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242 | return String.valueOf(i+1); // make it from 1 to length
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243 |
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244 | }
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245 | }
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246 |
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247 | return "-1";
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248 | } else {
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249 | return null;
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250 | }
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251 |
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252 | }
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253 |
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254 | protected int getNumChildren(String node_id) {
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255 | DBInfo info = this.coll_db.getInfo(node_id);
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256 | if (info == null) {
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257 | return 0;
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258 | }
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259 | String contains = info.getInfo("contains");
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260 | if (contains.equals("")) {
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261 | return 0;
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262 | }
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263 | String [] children = contains.split(";");
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264 | return children.length;
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265 | }
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266 |
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267 | /** returns the document type of the doc that the specified node
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268 | belongs to. should be one of
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269 | GSXML.DOC_TYPE_SIMPLE,
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270 | GSXML.DOC_TYPE_PAGED,
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271 | GSXML.DOC_TYPE_HIERARCHY
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272 | */
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273 | protected String getDocType(String node_id) {
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274 | DBInfo info = this.coll_db.getInfo(node_id);
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275 | if (info == null) {
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276 | return GSXML.DOC_TYPE_SIMPLE;
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277 | }
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278 | String doc_type = info.getInfo("doctype");
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279 | if (!doc_type.equals("")&&!doc_type.equals("doc")) {
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280 | return doc_type;
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281 | }
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282 |
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283 | String top_id = OID.getTop(node_id);
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284 | boolean is_top = (top_id.equals(node_id) ? true : false);
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285 |
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286 | String children = info.getInfo("contains");
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287 | boolean is_leaf = (children.equals("") ? true : false);
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288 |
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289 | if (is_top && is_leaf) { // a single section document
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290 | return GSXML.DOC_TYPE_SIMPLE;
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291 | }
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292 |
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293 | // now we just check the top node
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294 | if (!is_top) { // we need to look at the top info
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295 | info = this.coll_db.getInfo(top_id);
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296 | }
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297 | if (info == null) {
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298 | return GSXML.DOC_TYPE_HIERARCHY;
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299 | }
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300 |
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301 | String childtype = info.getInfo("childtype");
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302 | if (childtype.equals("Paged")) {
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303 | return GSXML.DOC_TYPE_PAGED;
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304 | }
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305 | return GSXML.DOC_TYPE_HIERARCHY;
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306 | }
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307 |
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308 | /** returns the content of a node
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309 | * should return a nodeContent element:
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310 | * <nodeContent>text content or other elements</nodeContent>
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311 | */
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312 | abstract protected Element getNodeContent(String doc_id, String lang) throws GSException;
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313 |
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314 | protected String getMetadata(String node_id, DBInfo info,
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315 | String metadata, String lang) {
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316 | boolean multiple = false;
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317 | String relation = "";
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318 | String separator = ", ";
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319 | int pos = metadata.indexOf(GSConstants.META_RELATION_SEP);
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320 | if (pos ==-1) {
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321 | Vector values = info.getMultiInfo(metadata);
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322 | if (values !=null){
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323 | // just a plain meta entry eg dc.Title
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324 | StringBuffer result = new StringBuffer();
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325 | boolean first = true;
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326 | for (int i=0; i<values.size(); i++) {
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327 | if (first) {
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328 | first = false;
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329 | } else {
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330 | result.append(separator);
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331 | }
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332 | result.append(this.macro_resolver.resolve((String)values.elementAt(i), lang, MacroResolver.SCOPE_META, node_id));
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333 | }
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334 | return result.toString();
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335 | }
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336 | else{
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337 | String result = info.getInfo(metadata);
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338 | return this.macro_resolver.resolve(result, lang, MacroResolver.SCOPE_META, node_id);
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339 | }
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340 | }
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341 |
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342 | String temp = metadata.substring(0, pos);
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343 | metadata = metadata.substring(pos+1);
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344 | // check for all on the front
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345 | if (temp.equals("all")) {
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346 | multiple=true;
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347 | pos = metadata.indexOf(GSConstants.META_RELATION_SEP);
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348 | if (pos ==-1) {
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349 | temp = "";
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350 | } else {
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351 | temp = metadata.substring(0, pos);
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352 | metadata = metadata.substring(pos+1);
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353 | }
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354 | }
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355 |
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356 | // now check for relational info
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357 | if (temp.equals("parent") || temp.equals("root") || temp.equals( "ancestors")) { // "current" "siblings" "children" "descendants"
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358 | relation = temp;
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359 | pos = metadata.indexOf(GSConstants.META_RELATION_SEP);
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360 | if (pos == -1) {
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361 | temp = "";
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362 | } else {
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363 | temp = metadata.substring(0, pos);
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364 | metadata = metadata.substring(pos+1);
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365 | }
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366 | }
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367 |
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368 | // now look for separator info
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369 | if (temp.startsWith(GSConstants.META_SEPARATOR_SEP) && temp.endsWith(GSConstants.META_SEPARATOR_SEP)) {
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370 | separator = temp.substring(1, temp.length()-1);
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371 |
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372 | }
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373 |
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374 | String relation_id = node_id;
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375 | if (relation.equals("parent") || relation.equals("ancestors")) {
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376 | relation_id = OID.getParent(node_id);
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377 | // parent or ancestor does not include self
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378 | if (relation_id.equals(node_id)){
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379 | return "";
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380 | }
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381 | } else if (relation.equals("root")) {
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382 | relation_id = OID.getTop(node_id);
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383 | }
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384 |
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385 | // now we either have a single node, or we have ancestors
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386 | DBInfo relation_info;
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387 | if (relation_id.equals(node_id)) {
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388 | relation_info = info;
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389 | } else {
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390 | relation_info = this.coll_db.getInfo(relation_id);
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391 | }
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392 | if (relation_info == null) {
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393 | return "";
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394 | }
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395 |
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396 | StringBuffer result = new StringBuffer();
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397 |
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398 | if (!multiple) {
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399 | result.append(this.macro_resolver.resolve(relation_info.getInfo(metadata), lang, MacroResolver.SCOPE_META, relation_id));
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400 | } else {
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401 | // we have multiple meta
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402 | Vector values = relation_info.getMultiInfo(metadata);
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403 | if (values != null) {
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404 | boolean first = true;
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405 | for (int i=0; i<values.size(); i++) {
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406 | if (first) {
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407 | first = false;
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408 | } else {
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409 | result.append(separator);
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410 | }
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411 | result.append(this.macro_resolver.resolve((String)values.elementAt(i), lang, MacroResolver.SCOPE_META, relation_id));
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412 | }
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413 | }
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414 | logger.info(result);
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415 | }
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416 | // if not ancestors, then this is all we do
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417 | if (!relation.equals("ancestors")) {
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418 | return result.toString();
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419 | }
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420 |
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421 | // now do the ancestors
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422 | String current_id = relation_id;
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423 | relation_id = OID.getParent(current_id);
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424 | while (!relation_id.equals(current_id)) {
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425 | relation_info = this.coll_db.getInfo(relation_id);
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426 | if (relation_info == null) return result.toString();
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427 | if (!multiple) {
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428 | result.insert(0, separator);
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429 | result.insert(0, this.macro_resolver.resolve(relation_info.getInfo(metadata), lang, MacroResolver.SCOPE_META, relation_id));
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430 | } else {
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431 | Vector values = relation_info.getMultiInfo(metadata);
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432 | if (values != null) {
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433 | for (int i=values.size()-1; i>=0; i--) {
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434 | result.insert(0, separator);
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435 | result.insert(0, this.macro_resolver.resolve((String)values.elementAt(i), lang, MacroResolver.SCOPE_META, relation_id));
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436 | }
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437 | }
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438 |
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439 | }
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440 | current_id = relation_id;
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441 | relation_id = OID.getParent(current_id);
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442 | }
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443 | return result.toString();
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444 | }
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445 |
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446 |
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447 | /** needs to get info from collection database - if the calling code gets it already it may pay to pass it in instead */
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448 | protected String resolveTextMacros(String doc_content, String doc_id, String lang)
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449 | {
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450 | // resolve any collection specific macros
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451 | doc_content = macro_resolver.resolve(doc_content, lang, MacroResolver.SCOPE_TEXT, doc_id);
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452 | return doc_content;
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453 | }
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454 |
|
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455 | protected Element getInfo(String doc_id, String info_type) {
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456 |
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457 | String value="";
|
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458 | if (info_type.equals(INFO_NUM_SIBS)) {
|
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459 | String parent_id = OID.getParent(doc_id);
|
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460 | if (parent_id.equals(doc_id)) {
|
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461 | value="0";
|
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462 | } else {
|
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463 | value = String.valueOf(getNumChildren(parent_id));
|
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464 | }
|
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465 | } else if (info_type.equals(INFO_NUM_CHILDREN)) {
|
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466 | value = String.valueOf(getNumChildren(doc_id));
|
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467 | } else if (info_type.equals(INFO_SIB_POS)) {
|
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468 | String parent_id = OID.getParent(doc_id);
|
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469 | if (parent_id.equals(doc_id)) {
|
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470 | value="-1";
|
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471 | } else {
|
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472 | DBInfo info = this.coll_db.getInfo(parent_id);
|
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473 | if (info==null) {
|
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474 | value ="-1";
|
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475 | } else {
|
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476 | String contains = info.getInfo("contains");
|
---|
477 | contains = contains.replaceAll("\"", parent_id);
|
---|
478 | String [] children = contains.split(";");
|
---|
479 | for (int i=0;i<children.length;i++) {
|
---|
480 | String child_id = children[i];
|
---|
481 | if (child_id.equals(doc_id)) {
|
---|
482 | value = String.valueOf(i+1); // make it from 1 to length
|
---|
483 | break;
|
---|
484 | }
|
---|
485 | }
|
---|
486 | }
|
---|
487 | }
|
---|
488 | } else {
|
---|
489 | return null;
|
---|
490 | }
|
---|
491 | Element info_elem = this.doc.createElement("info");
|
---|
492 | info_elem.setAttribute(GSXML.NAME_ATT, info_type);
|
---|
493 | info_elem.setAttribute(GSXML.VALUE_ATT, value);
|
---|
494 | return info_elem;
|
---|
495 | }
|
---|
496 |
|
---|
497 | protected String getHrefOID(String href_url){
|
---|
498 | return this.coll_db.docnum2OID(href_url);
|
---|
499 | }
|
---|
500 |
|
---|
501 | }
|
---|