1 | package org.greenstone.gsdl3.service;
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2 |
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3 | // Greenstone classes
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4 | import org.greenstone.util.Misc;
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5 | import org.greenstone.gsdl3.util.*;
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6 |
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7 | // XML classes
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8 | import org.w3c.dom.Element;
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9 | import org.w3c.dom.Document;
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10 | import org.w3c.dom.NodeList;
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11 |
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12 | //Java classes
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13 | import java.util.ArrayList;
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14 | import java.util.HashMap;
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15 | import java.io.File;
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16 | import java.io.BufferedReader;
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17 | import java.io.Serializable;
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18 | import java.net.Authenticator;
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19 |
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20 | import org.apache.log4j.*;
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21 |
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22 | /**
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23 | *
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24 | * @author Katherine Don
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25 | * @author Chi-Yu Huang
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26 | */
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27 |
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28 | public class IViaSearch
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29 | extends AbstractTextSearch {
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30 |
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31 |
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32 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.IViaSearch.class.getName());
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33 |
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34 | // have standard gs param names for hits per page, and start page
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35 | // these need to be mapped to iVia params
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36 | protected static final String IM_HITS_PARAM = "no_of_records_per_page";
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37 | protected static final String IM_START_PAGE_PARAM = "start_page_no";
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38 |
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39 | protected String ivia_server_url = null;
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40 | protected ArrayList<String> index_ids = null;
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41 | public IViaSearch()
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42 | {
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43 | }
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44 |
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45 | //Configure IViaSearch Service
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46 | public boolean configure(Element info, Element extra_info)
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47 | {
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48 | if (!super.configure(info, extra_info)){
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49 | return false;
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50 | }
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51 |
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52 | Element server_elem = (Element)GSXML.getChildByTagName(info, "iViaServer");
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53 | if (server_elem == null) {
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54 | logger.error("no iViaServer element found");
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55 | return false;
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56 | }
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57 | ivia_server_url = server_elem.getAttribute("url");
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58 | if (ivia_server_url.equals("")) {
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59 | logger.error("no url for the iViaServer element");
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60 | return false;
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61 | }
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62 | does_paging = true;
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63 | does_multi_index_search = true;
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64 | this.default_index = ",kw,au,su,ti,de,fu,"; // all of them
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65 | index_ids = new ArrayList<String>();
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66 | index_ids.add("kw");
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67 | index_ids.add("au");
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68 | index_ids.add("su");
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69 | index_ids.add("ti");
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70 | index_ids.add("de");
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71 | index_ids.add("fu");
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72 |
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73 | return true;
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74 | }
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75 |
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76 | /** Process a text query - implemented by concrete subclasses */
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77 | protected Element processTextQuery(Element request) {
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78 | Document result_doc = XMLConverter.newDOM();
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79 | // Create a new (empty) result message
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80 | Element result = result_doc.createElement(GSXML.RESPONSE_ELEM);
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81 | result.setAttribute(GSXML.FROM_ATT, QUERY_SERVICE);
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82 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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83 | Element doc_node_list = result_doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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84 | result.appendChild(doc_node_list);
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85 | Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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86 | if (param_list == null) {
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87 | logger.error("TextQuery request had no paramList.");
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88 | return result; // Return the empty result
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89 | }
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90 |
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91 | // Process the request parameters
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92 | HashMap<String, Serializable> params = GSXML.extractParams(param_list, false);
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93 |
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94 | // Make sure a query has been specified
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95 | String query = (String) params.get(QUERY_PARAM);
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96 | if (query == null || query.equals("")) {
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97 | return result; // Return the empty result
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98 | }
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99 |
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100 | // tidy whitespace
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101 | query = query.replaceAll("\\s+", "+");
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102 | String url_string = ivia_server_url+"/cgi-bin/canned_search?theme=gsdl3&query="+query;
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103 |
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104 | // check for fields
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105 | String fields = (String) params.get(INDEX_PARAM);
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106 | fields = checkFieldParam(fields); // removes invalid fields
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107 | if (!fields.equals("")) {
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108 | url_string += "&fields="+fields;
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109 | }
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110 | //check for hits per page
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111 | String hits_per_page = (String) params.get(HITS_PER_PAGE_PARAM);
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112 | if (hits_per_page != null && !hits_per_page.equals("")) {
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113 | url_string += "&"+IM_HITS_PARAM+"="+hits_per_page;
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114 | }
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115 |
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116 | // check for start page
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117 | String start_page = (String) params.get(START_PAGE_PARAM);
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118 | if (start_page != null && !start_page.equals("")) {
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119 | url_string += "&"+IM_START_PAGE_PARAM+"="+start_page;
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120 | }
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121 | String results_num = null;
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122 | String doc_ids = null;
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123 | BufferedReader reader = null;
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124 | try {
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125 | logger.debug("sending "+url_string);
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126 | reader = Misc.makeHttpConnection(url_string);
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127 | results_num = reader.readLine();
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128 | doc_ids = reader.readLine();
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129 | } catch (java.net.MalformedURLException e) {
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130 | GSXML.addError(result, "Malformed URL: "+url_string);
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131 | return result;
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132 | } catch (java.io.IOException e) {
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133 | GSXML.addError(result, "IOException during connection to "+url_string+": "+e.toString());
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134 | return result;
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135 | }
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136 |
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137 | if (results_num.startsWith("Resources: ") && doc_ids.startsWith("Ids: ")) {
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138 | results_num = results_num.substring(11);
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139 | doc_ids = doc_ids.substring(5).trim();
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140 |
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141 | } else {
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142 | logger.error("badly formatted results:");
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143 | StringBuffer result_string = new StringBuffer();
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144 | result_string.append("Error: badly formatted result from IVia server:\n ");
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145 | result_string.append(results_num);
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146 | result_string.append(doc_ids);
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147 | String line;
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148 | try {
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149 | while((line = reader.readLine()) != null) {
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150 | result_string.append(line);
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151 | }
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152 | } catch (Exception e) {
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153 | result_string.append("Exception: "+e);
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154 | }
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155 | GSXML.addError(result, result_string.toString());
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156 |
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157 | return result;
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158 | }
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159 |
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160 | // get the num docs and add to a metadata list
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161 | Element metadata_list = result_doc.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
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162 | result.appendChild(metadata_list);
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163 |
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164 | // Add a metadata element specifying the number of matching documents
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165 | long numdocs = Long.parseLong(results_num);
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166 | GSXML.addMetadata(metadata_list, "numDocsMatched", ""+numdocs);
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167 | String [] ids = doc_ids.split(" ");
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168 |
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169 | for (int d=0; d<ids.length; d++) {
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170 | Element doc_node = result_doc.createElement(GSXML.DOC_NODE_ELEM);
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171 | doc_node.setAttribute(GSXML.NODE_ID_ATT, ids[d]);
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172 | doc_node_list.appendChild(doc_node);
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173 | }
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174 | return result;
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175 | }
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176 |
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177 | protected String checkFieldParam(String fields) {
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178 |
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179 | if (fields == null) {
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180 | // return the default
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181 | return "";
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182 | }
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183 | StringBuffer new_fields = new StringBuffer();
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184 | String [] ids = fields.split(",");
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185 | for (int i=0; i<ids.length; i++) {
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186 | if(index_ids.contains(ids[i])) {
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187 | new_fields.append(ids[i]);
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188 | new_fields.append(",");
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189 | }
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190 | }
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191 | if (new_fields.length() == 0) {
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192 | return "";
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193 | }
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194 | return new_fields.toString();
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195 | }
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196 | /**
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197 | An IVia server has a fixed list of fields to search (I think) so we can hard code them here rather than reading them in from a config file
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198 | */
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199 | protected void getIndexData(ArrayList<String> index_ids, ArrayList<String> index_names,String lang){
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200 | index_ids.addAll(this.index_ids);
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201 | index_names.add(getTextString("param."+INDEX_PARAM+".kw", lang));
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202 | index_names.add(getTextString("param."+INDEX_PARAM+".au", lang));
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203 | index_names.add(getTextString("param."+INDEX_PARAM+".su", lang));
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204 | index_names.add(getTextString("param."+INDEX_PARAM+".ti", lang));
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205 | index_names.add(getTextString("param."+INDEX_PARAM+".de", lang));
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206 | index_names.add(getTextString("param."+INDEX_PARAM+".fu", lang));
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207 | }
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208 |
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209 | }
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