1 | /*
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2 | * AbstractTextSearch.java
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3 | * Copyright (C) 2005 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.util.GSXML;
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23 | import org.greenstone.gsdl3.util.GSPath;
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24 |
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25 | // XML classes
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26 | import org.w3c.dom.Document;
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27 | import org.w3c.dom.Element;
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28 | import org.w3c.dom.NodeList;
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29 |
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30 | // java classes
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31 | import java.util.ArrayList;
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32 | import java.util.HashMap;
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33 |
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34 | import org.apache.log4j.*;
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35 |
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36 | /** Partially implements a generic search service
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37 | *
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38 | * @author <a href="mailto:[email protected]">Katherine Don</a>
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39 | */
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40 |
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41 | public abstract class AbstractTextSearch
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42 | extends AbstractSearch
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43 | {
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44 |
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45 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.AbstractTextSearch.class.getName());
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46 |
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47 |
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48 | // optional standard params - some of these have to be implemented
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49 | protected static final String INDEX_SUBCOLLECTION_PARAM = "indexSubcollection";
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50 | protected static final String INDEX_LANGUAGE_PARAM = "indexLanguage";
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51 |
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52 | protected static final String INDEX_SUBCOLLECTION_ELEM = "indexSubcollection";
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53 | protected static final String INDEX_LANGUAGE_ELEM = "indexLanguage";
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54 |
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55 |
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56 | // some other common params that may be used
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57 | protected static final String CASE_PARAM = "case";
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58 | protected static final String STEM_PARAM = "stem";
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59 | protected static final String ACCENT_PARAM="accent";
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60 |
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61 | protected static final String BOOLEAN_PARAM_ON = "1";
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62 | protected static final String BOOLEAN_PARAM_OFF = "0";
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63 | protected static final String MATCH_PARAM = "matchMode";
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64 | protected static final String MATCH_PARAM_ALL = "all";
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65 | protected static final String MATCH_PARAM_SOME = "some";
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66 |
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67 | protected String default_index_subcollection = "";
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68 |
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69 | protected String default_index_language = "";
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70 |
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71 | public AbstractTextSearch()
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72 | {
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73 | // the search service
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74 | QUERY_SERVICE = "TextQuery";
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75 | }
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76 |
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77 |
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78 | /** adds the standard query params into the service description */
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79 | protected void addStandardQueryParams(Element param_list, String lang)
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80 | {
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81 | if (!default_index_subcollection.equals("")){
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82 | createParameter(INDEX_SUBCOLLECTION_PARAM,param_list, lang);
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83 | }
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84 | if (!default_index_language.equals("")){
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85 | createParameter(INDEX_LANGUAGE_PARAM,param_list, lang);
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86 | }
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87 |
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88 | super.addStandardQueryParams(param_list,lang);
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89 | }
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90 |
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91 | /** Top up createParameterChain with TextQuery specific params:
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92 | * case, stem ...
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93 | */
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94 | protected boolean createParameterChain(String name, Element param_list, String lang, String default_value)
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95 | {
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96 | Element param = null;
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97 | String param_default = default_value;
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98 |
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99 | if (super.createParameterChain(name,param_list,lang,default_value)) {
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100 | // found a match, so can stop here
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101 | return true;
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102 | }
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103 | // otherwise look to see if it is a text specific parameter
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104 | else if (name.equals(INDEX_SUBCOLLECTION_PARAM)){
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105 | Element index_sub_list = (Element)GSXML.getChildByTagName(this.config_info, INDEX_SUBCOLLECTION_ELEM+GSXML.LIST_MODIFIER);
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106 | if (index_sub_list == null) return true; // processed, just not a very interesting result
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107 | ArrayList index_sub_ids = new ArrayList();
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108 | ArrayList index_sub_names = new ArrayList();
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109 | getIndexSubcollectionData(index_sub_ids, index_sub_names, lang);
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110 | String param_type = GSXML.PARAM_TYPE_ENUM_SINGLE;
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111 | if (does_multi_index_search) {
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112 | param_type = GSXML.PARAM_TYPE_ENUM_MULTI;
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113 | }
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114 | if (param_default == null) {
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115 | param_default = this.default_index_subcollection;
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116 | }
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117 | param = GSXML.createParameterDescription2(this.doc, INDEX_SUBCOLLECTION_PARAM, getTextString("param."+INDEX_SUBCOLLECTION_PARAM, lang), param_type, param_default, index_sub_ids, index_sub_names);
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118 | param_list.appendChild(param);
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119 | return true;
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120 | }
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121 | else if(name.equals(INDEX_LANGUAGE_PARAM)){
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122 | Element index_lang_list = (Element)GSXML.getChildByTagName(this.config_info, INDEX_LANGUAGE_ELEM+GSXML.LIST_MODIFIER);
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123 | if (index_lang_list == null) return true; // processed, just not a very interesting result
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124 | ArrayList index_lang_ids = new ArrayList();
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125 | ArrayList index_lang_names = new ArrayList();
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126 | getIndexLanguageData(index_lang_ids, index_lang_names, lang);
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127 | String param_type = GSXML.PARAM_TYPE_ENUM_SINGLE;
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128 | if (does_multi_index_search) {
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129 | param_type = GSXML.PARAM_TYPE_ENUM_MULTI;
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130 | }
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131 | if (param_default == null) {
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132 | param_default = this.default_index_language;
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133 | }
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134 | param = GSXML.createParameterDescription2(this.doc, INDEX_LANGUAGE_PARAM, getTextString("param."+INDEX_LANGUAGE_PARAM, lang), param_type, param_default, index_lang_ids, index_lang_names);
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135 | param_list.appendChild(param);
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136 | return true;
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137 | }
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138 |
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139 | // Get to there then none of the above params matched
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140 | // => return false so the chain can continue
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141 | return false;
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142 |
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143 | }
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144 |
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145 | /** do the actual query
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146 | * must be implemented by subclass */
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147 | abstract protected Element processTextQuery(Element request);
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148 |
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149 | /** get the details about the indexexSubcollections available
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150 | * might be implemented by subclass
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151 | */
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152 | protected void getIndexSubcollectionData(ArrayList index_ids, ArrayList index_names, String lang){}
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153 |
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154 | /** get the details about the indexes available
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155 | * might be implemented by subclass
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156 | */
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157 | protected void getIndexLanguageData(ArrayList index_ids, ArrayList index_names, String lang){}
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158 |
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159 |
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160 | }
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161 |
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