1 | /*
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2 | * PhindServices.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 | import org.greenstone.gsdl3.util.*;
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22 |
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23 | import org.greenstone.mgpp.*;
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24 | import org.w3c.dom.Document;
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25 | import org.w3c.dom.Node;
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26 | import org.w3c.dom.Element;
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27 | import org.w3c.dom.Text;
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28 |
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29 | import java.util.Vector;
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30 | import java.util.HashMap;
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31 | import java.io.File;
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32 |
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33 | import org.apache.log4j.*;
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34 |
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35 | /**
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36 | * PhindServices - the phind phrase browsing 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 | * @version $Revision: 14483 $
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40 | */
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41 | public class PhindPhraseBrowse
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42 | extends ServiceRack {
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43 |
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44 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.PhindPhraseBrowse.class.getName());
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45 |
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46 | // the services on offer
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47 | private static final String PHIND_SERVICE = "PhindApplet";
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48 |
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49 | private static MGPPRetrieveWrapper mgpp_retrieve_src=null;
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50 | private static MGPPSearchWrapper mgpp_search_src=null;
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51 | private String basepath = null;
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52 |
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53 | private Element applet_description = null;
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54 |
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55 | public PhindPhraseBrowse() {
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56 | if(this.mgpp_retrieve_src == null) {
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57 | this.mgpp_retrieve_src = new MGPPRetrieveWrapper();
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58 | }
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59 | if(this.mgpp_search_src == null) {
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60 | this.mgpp_search_src = new MGPPSearchWrapper();
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61 | }
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62 | // set up the default params
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63 | this.mgpp_search_src.setQueryLevel("Document");
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64 | this.mgpp_search_src.setReturnLevel("Document");
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65 | this.mgpp_search_src.setMaxDocs(5);
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66 | this.mgpp_search_src.setStem(false);
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67 | this.mgpp_search_src.setCase(true);
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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.mgpp_retrieve_src.unloadIndexData();
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73 | this.mgpp_search_src.unloadIndexData();
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74 | }
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75 |
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76 | /** configure the service module
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77 | *
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78 | * @param info a DOM Element containing any config info for the service
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79 | * @return true if configured
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80 | */
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81 | public boolean configure(Element info, Element extra_info) {
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82 |
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83 | if (!super.configure(info, extra_info)){
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84 | return false;
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85 | }
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86 |
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87 | logger.info("configuring PhindPhraseBrowse");
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88 |
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89 | // set up short_service_info_ - for now just has name and type
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90 | Element e = this.doc.createElement(GSXML.SERVICE_ELEM);
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91 | e.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_APPLET);
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92 | e.setAttribute(GSXML.NAME_ATT, PHIND_SERVICE);
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93 | this.short_service_info.appendChild(e);
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94 |
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95 | // set up the static applet description
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96 |
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97 | applet_description = this.doc.createElement(GSXML.SERVICE_ELEM);
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98 | applet_description.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_APPLET);
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99 | applet_description.setAttribute(GSXML.NAME_ATT, PHIND_SERVICE);
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100 |
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101 | // add in the applet info for the phind applet
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102 | // need to make this dynamic - library names etc
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103 | // change the applet params - have a single param with the library name
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104 | // this is left blank at this end, and must be filled in by applet action - if the library name is not needed, this param is left out
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105 | // phindcgi param now is not complete - library must be prepended to it.
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106 | String app_info = "<"+GSXML.APPLET_ELEM+" CODEBASE='applet' CODE='org.greenstone.applet.phind.Phind.class' ARCHIVE='phind.jar, xercesImpl.jar, xml-apis.jar' WIDTH='500' HEIGHT='400'><PARAM NAME='library' VALUE=''/> <PARAM NAME='phindcgi' VALUE='?";
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107 | app_info += GSParams.ACTION +"=a&"+GSParams.REQUEST_TYPE +"=r&"+GSParams.SERVICE+"="+PHIND_SERVICE+"&"+GSParams.OUTPUT+"=xml&"+GSParams.RESPONSE_ONLY+"=1'/>";
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108 | app_info +="<PARAM NAME='collection' VALUE='";
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109 | app_info += this.cluster_name;
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110 | app_info += "'/> <PARAM NAME='classifier' VALUE='1'/> <PARAM NAME='orientation' VALUE='vertical'/> <PARAM NAME='depth' VALUE='2'/> <PARAM NAME='resultorder' VALUE='L,l,E,e,D,d'/> <PARAM NAME='backdrop' VALUE='interfaces/default/images/phindbg1.jpg'/><PARAM NAME='fontsize' VALUE='10'/> <PARAM NAME='blocksize' VALUE='10'/>The Phind java applet.</"+GSXML.APPLET_ELEM+">";
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111 |
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112 | Document dom = this.converter.getDOM(app_info);
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113 | if (dom==null) {
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114 | logger.error("Couldn't parse applet info");
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115 | return false;
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116 | }
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117 | Element app_elem = dom.getDocumentElement();
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118 | applet_description.appendChild(this.doc.importNode(app_elem, true));
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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 | protected Element getServiceDescription(String service, String lang, String subset) {
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124 | if (!service.equals(PHIND_SERVICE)) {
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125 | return null;
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126 | }
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127 | Element describe = (Element) applet_description.cloneNode(true);
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128 | describe.appendChild(GSXML.createDisplayTextElement(this.doc, GSXML.DISPLAY_TEXT_NAME, getTextString(PHIND_SERVICE+".name", lang)));
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129 | describe.appendChild(GSXML.createDisplayTextElement(this.doc, GSXML.DISPLAY_TEXT_DESCRIPTION, getTextString(PHIND_SERVICE+".description", lang)));
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130 | return describe;
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131 | }
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132 |
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133 | protected Element processPhindApplet(Element request) {
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134 |
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135 | Element param_elem = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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136 | HashMap params = GSXML.extractParams(param_elem, false);
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137 |
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138 | long first_e = Long.parseLong((String)params.get("pfe"));
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139 | long last_e = Long.parseLong((String)params.get("ple"));
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140 | long first_l = Long.parseLong((String)params.get("pfl"));
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141 | long last_l = Long.parseLong((String)params.get("pll"));
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142 | long first_d = Long.parseLong((String)params.get("pfd"));
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143 | long last_d = Long.parseLong((String)params.get("pld"));
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144 |
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145 | long phrase;
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146 | String phrase_str = (String)params.get("ppnum");
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147 | if (phrase_str == null || phrase_str.equals("")) {
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148 | phrase=0;
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149 | } else {
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150 | phrase = Long.parseLong(phrase_str);
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151 | }
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152 | String word = (String)params.get("pptext");
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153 | String phind_index = (String)params.get("pc");
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154 | // the location of the mgpp database files
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155 | this.basepath = GSFile.phindBaseDir(this.site_home, this.cluster_name, phind_index);
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156 |
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157 | // the result element
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158 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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159 | result.setAttribute(GSXML.FROM_ATT, PHIND_SERVICE);
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160 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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161 |
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162 | // applet result info must be in appletInfo element
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163 | Element applet_data = this.doc.createElement(GSXML.APPLET_DATA_ELEM);
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164 | result.appendChild(applet_data);
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165 | Element phind_data = this.doc.createElement("phindData");
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166 | applet_data.appendChild(phind_data);
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167 |
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168 |
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169 | // if we dont know the phrase number, look it up
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170 | if (phrase == 0) {
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171 | if (word==null || word.equals("")) {
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172 | Element error = phindError("no word or phrase");
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173 | phind_data.appendChild(error);
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174 | return result;
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175 | }
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176 | phrase = findPhraseNumberFromWord( word);
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177 | }
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178 | if (phrase==0) {
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179 | // the word is not in the collection
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180 | // return a phind error string
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181 | Element error = phindError("the term "+word+" is not in the collection");
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182 | phind_data.appendChild(error);
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183 | return result;
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184 | }
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185 |
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186 | // get the phrase data into the phind_data node
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187 | getPhraseData(phind_data, phrase, first_l, last_l,
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188 | first_e, last_e, first_d, last_d);
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189 | return result;
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190 |
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191 |
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192 | }// processPhindApplet
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193 |
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194 | protected long findPhraseNumberFromWord(String word) {
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195 | synchronized (mgpp_search_src) {
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196 | // set the mgpp index data - we are looking up pword
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197 | mgpp_search_src.loadIndexData(this.basepath+File.separatorChar+"pword");
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198 |
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199 | mgpp_search_src.runQuery(word);
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200 |
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201 | MGPPQueryResult res = mgpp_search_src.getQueryResult();
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202 | Vector docs = res.getDocs();
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203 | if (docs.size()==0) {
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204 | // phrase not found
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205 | return 0;
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206 | }
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207 | MGPPDocInfo doc = (MGPPDocInfo)docs.firstElement();
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208 | return doc.num_;
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209 | }
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210 | }
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211 |
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212 | protected boolean getPhraseData(Element phind_data,
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213 | long phrase, long first_l, long last_l,
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214 | long first_e, long last_e, long first_d,
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215 | long last_d) {
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216 |
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217 | synchronized (mgpp_retrieve_src) {
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218 | String record = this.mgpp_retrieve_src.getDocument(this.basepath+File.separatorChar+"pdata", "Document",
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219 | phrase);
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220 | if (record.equals("")) {
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221 | Element error = phindError("somethings gone wrong - we haven't got a record for phrase number "+phrase);
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222 | phind_data.appendChild(error);
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223 | return false;
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224 | }
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225 |
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226 | // parse the record - its in gordons cryptic form
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227 | // ":word:tf:ef:df:el:dl:lf:ll"
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228 | // el: e,e,e
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229 | // dl: d;f,d;f,
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230 | // lf and ll may be null
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231 | // l: type,dest, dest; type,dest,dest
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232 |
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233 | // ignore everything up to and including first colon (has
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234 | // <Document>3505: at the start)
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235 | record = record.substring(record.indexOf(':')+1);
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236 |
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237 | // split on ':'
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238 | String [] fields = record.split(":");
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239 | String word = fields[0];
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240 | String tf = fields[1];
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241 | String ef = fields[2];
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242 | String df = fields[3];
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243 |
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244 |
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245 | String expansions = fields[4];
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246 | String documents = fields[5];
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247 | String lf = "0";
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248 | String linklist = "";
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249 | if (fields.length > 7) {// have thesaurus stuff
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250 | lf =fields[6];
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251 | linklist = fields[7];
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252 | }
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253 |
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254 | // the phindData attributes and phrase
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255 | phind_data.setAttribute("id", Long.toString(phrase));
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256 | phind_data.setAttribute("df", df);
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257 | phind_data.setAttribute("ef", ef);
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258 | phind_data.setAttribute("lf", lf);
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259 | phind_data.setAttribute("tf", tf);
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260 | GSXML.createTextElement(this.doc, "phrase", word);
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261 |
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262 | addExpansionList(phind_data, expansions, word, ef, first_e, last_e);
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263 | addDocumentList(phind_data, documents, word, df, first_d, last_d);
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264 | if (!lf.equals("0")) {
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265 | addThesaurusList(phind_data, linklist, word, lf, first_l, last_l);
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266 | }
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267 | return true;
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268 | }
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269 | }
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270 |
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271 | protected boolean addExpansionList( Element phind_data, String record,
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272 | String word,
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273 | String freq,
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274 | long first, long last) {
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275 |
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276 | Element expansion_list = this.doc.createElement("expansionList");
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277 | phind_data.appendChild(expansion_list);
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278 | expansion_list.setAttribute("length", freq);
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279 | expansion_list.setAttribute("start", Long.toString(first));
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280 | expansion_list.setAttribute("end", Long.toString(last));
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281 |
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282 | // get the list of strings
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283 | String [] expansions = record.split(",");
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284 | int length = expansions.length;
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285 | if (length < last) last = length;
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286 | for (long i = first; i < last; i++) {
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287 | long num = Long.parseLong(expansions[(int)i]);
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288 | Element expansion = getExpansion( num, word);
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289 | expansion.setAttribute("num", Long.toString(i));
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290 | expansion_list.appendChild(expansion);
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291 | }
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292 | return true;
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293 | }
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294 |
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295 | protected Element getExpansion(long phrase_num,
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296 | String orig_phrase) {
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297 |
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298 | // look up the phrase in the pdata thingy
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299 | String record = this.mgpp_retrieve_src.getDocument(this.basepath+File.separatorChar+"pdata", "Document",
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300 | phrase_num);
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301 |
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302 | if (record ==null || record.equals("")) return null;
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303 |
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304 | // ignore everything up to and including first colon
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305 | record = record.substring(record.indexOf(':')+1);
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306 |
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307 | String [] fields = record.split(":");
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308 | String phrase = fields[0];
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309 | String tf = fields[1];
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310 | //String ef = fields[2]; dont use this
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311 | String df = fields[3];
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312 |
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313 | Element expansion = this.doc.createElement("expansion");
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314 | expansion.setAttribute("tf", tf);
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315 | expansion.setAttribute("df", df);
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316 | expansion.setAttribute("id", Long.toString(phrase_num));
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317 |
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318 | // get teh suffix and prefix
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319 | String [] ends = splitPhraseOnWord(phrase, orig_phrase);
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320 | if (!ends[0].equals("")) {
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321 | expansion.appendChild(GSXML.createTextElement(this.doc, "prefix", ends[0]));
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322 | }
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323 | if (!ends[1].equals("")) {
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324 | expansion.appendChild(GSXML.createTextElement(this.doc, "suffix", ends[1]));
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325 | }
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326 |
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327 | return expansion;
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328 |
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329 | }
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330 |
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331 | protected boolean addDocumentList(Element phind_data, String record,
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332 | String word,
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333 | String freq,
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334 | long first, long last) {
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335 |
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336 | Element document_list = this.doc.createElement("documentList");
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337 | phind_data.appendChild(document_list);
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338 | document_list.setAttribute("length", freq);
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339 | document_list.setAttribute("start", Long.toString(first));
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340 | document_list.setAttribute("end", Long.toString(last));
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341 |
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342 | // get the list of doc,freq
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343 | String [] doc_freqs = record.split(";");
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344 | int length = doc_freqs.length;
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345 | if (length<last) last=length;
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346 |
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347 | for (long i = first; i < last; i++) {
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348 | String doc_elem = doc_freqs[(int)i];
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349 | int p = doc_elem.indexOf(',');
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350 | long doc_num;
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351 | String doc_freq;
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352 | if (p == -1) { // there is no freq in the record
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353 | doc_num =Long.parseLong(doc_elem);
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354 | doc_freq = "1";
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355 | } else {
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356 | doc_num = Long.parseLong(doc_elem.substring(0,p));
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357 | doc_freq = doc_elem.substring(p+1);
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358 | }
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359 | Element document = getDocument( doc_num);
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360 | document.setAttribute("freq", doc_freq);
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361 | document.setAttribute("num", Long.toString(i));
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362 | document_list.appendChild(document);
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363 | }
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364 |
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365 |
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366 | return true;
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367 | }
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368 |
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369 |
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370 | protected Element getDocument(long doc_num) {
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371 |
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372 | // look up the phrase in the docs thingy
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373 | String record = this.mgpp_retrieve_src.getDocument(this.basepath+File.separatorChar+"docs", "Document",
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374 | doc_num);
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375 |
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376 | if (record ==null || record.equals("")) return null;
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377 |
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378 | // ignore everything up to and including first \t
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379 | record = record.substring(record.indexOf('\t')+1);
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380 |
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381 | String [] fields = record.split("\t");
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382 | String hash = fields[0];
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383 | String title = fields[1];
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384 |
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385 | Element d = this.doc.createElement("document");
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386 | d.setAttribute("hash", hash);
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387 | d.appendChild(GSXML.createTextElement(this.doc, "title", title));
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388 |
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389 | return d;
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390 |
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391 | }
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392 | protected boolean addThesaurusList(Element phind_data, String record,
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393 | String word,
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394 | String freq,
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395 | long first, long last) {
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396 |
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397 |
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398 | Element thesaurus_list = this.doc.createElement("thesaurusList");
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399 | phind_data.appendChild(thesaurus_list);
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400 | thesaurus_list.setAttribute("length", freq);
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401 | thesaurus_list.setAttribute("start", Long.toString(first));
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402 | thesaurus_list.setAttribute("end", Long.toString(last));
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403 |
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404 | // get the list of type,dest,dest
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405 | String [] links = record.split(";");
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406 | int length = links.length;
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407 | long index = 0;
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408 | for (int i = 0; i < length; i++) { // go through the entries
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409 | String link_info = links[(int)i];
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410 | String [] items = link_info.split(",");
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411 | // the first entry is teh type
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412 | String type = items[0];
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413 | for (int j = 1; j<items.length; j++, index++) {
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414 | if (index >= first && index < last) { // only output the ones we want
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415 | long phrase = Long.parseLong(items[j]);
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416 | Element t = getThesaurus(phrase);
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417 | t.setAttribute("type", type);
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418 | thesaurus_list.appendChild(t);
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419 | }
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420 | }
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421 | }
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422 |
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423 | return true;
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424 | }
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425 |
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426 | protected Element getThesaurus(long phrase_num) {
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427 |
|
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428 | // look up the phrase in the pdata thingy
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429 | String record = this.mgpp_retrieve_src.getDocument(this.basepath+File.separatorChar+"pdata", "Document",
|
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430 | phrase_num);
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431 |
|
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432 | if (record ==null || record.equals("")) return null;
|
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433 |
|
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434 | // ignore everything up to and including first colon
|
---|
435 | record = record.substring(record.indexOf(':')+1);
|
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436 |
|
---|
437 | String [] fields = record.split(":");
|
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438 | String phrase = fields[0];
|
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439 | String tf = fields[1];
|
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440 | //String ef = fields[2]; dont use this
|
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441 | String df = fields[3];
|
---|
442 |
|
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443 | Element thesaurus = this.doc.createElement("thesaurus");
|
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444 | thesaurus.setAttribute("tf", tf);
|
---|
445 | thesaurus.setAttribute("df", df);
|
---|
446 | thesaurus.setAttribute("id", Long.toString(phrase_num));
|
---|
447 | thesaurus.appendChild(GSXML.createTextElement(this.doc, "phrase", phrase));
|
---|
448 | return thesaurus;
|
---|
449 |
|
---|
450 | }
|
---|
451 |
|
---|
452 | /** returns an array of two elements - the prefix and the suffix*/
|
---|
453 | protected String [] splitPhraseOnWord(String phrase, String word) {
|
---|
454 |
|
---|
455 | if (word.equals("")) {
|
---|
456 |
|
---|
457 | String [] res = {phrase, ""};
|
---|
458 | return res;
|
---|
459 | }
|
---|
460 | // use 2 so that we only split on the first occurrance. trailing empty strings should be included
|
---|
461 | String [] result = phrase.split(word, 2);
|
---|
462 | return result;
|
---|
463 |
|
---|
464 | }
|
---|
465 |
|
---|
466 | protected Element phindError(String message) {
|
---|
467 | Element e = this.doc.createElement("phindError");
|
---|
468 | Text t = this.doc.createTextNode(message);
|
---|
469 | e.appendChild(t);
|
---|
470 | return e;
|
---|
471 | }
|
---|
472 |
|
---|
473 | }
|
---|
474 |
|
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