1 | package org.greenstone.gsdl3.action;
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2 |
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3 | import org.greenstone.gsdl3.core.ModuleInterface;
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4 | import org.greenstone.gsdl3.util.*;
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5 | // XML classes
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6 | import org.w3c.dom.Node;
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7 | import org.w3c.dom.NodeList;
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8 | import org.w3c.dom.Text;
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9 | import org.w3c.dom.Document;
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10 | import org.w3c.dom.Element;
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11 |
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12 | import java.util.HashMap;
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13 | import java.util.HashSet;
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14 | import java.util.Vector;
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15 | import java.util.Map;
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16 | import java.util.Iterator;
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17 | import java.io.File;
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18 |
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19 | import org.apache.log4j.*;
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20 |
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21 | /** action class for queries */
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22 | public class QueryAction extends Action
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23 | {
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24 |
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25 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.QueryAction.class.getName());
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26 |
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27 | /**
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28 | * process - processes a request.
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29 | */
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30 | public Node process(Node message_node)
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31 | {
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32 |
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33 | Element message = this.converter.nodeToElement(message_node);
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34 |
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35 | // get the request - assume there is only one
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36 | Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
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37 |
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38 | // create the return message
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39 | Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
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40 | Element response = basicQuery(request);
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41 | result.appendChild(this.doc.importNode(response, true));
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42 | return result;
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43 | }
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44 |
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45 | /**
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46 | * a generic query handler this gets the service description, does the query
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47 | * (just passes all the params to the service, then gets the titles for any
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48 | * results
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49 | */
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50 | protected Element basicQuery(Element request)
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51 | {
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52 |
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53 | // the result
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54 | Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
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55 |
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56 | // extract the params from the cgi-request, and check that we have a coll specified
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57 | Element cgi_param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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58 | HashMap params = GSXML.extractParams(cgi_param_list, false);
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59 |
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60 | String request_type = (String) params.get(GSParams.REQUEST_TYPE);
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61 | String service_name = (String) params.get(GSParams.SERVICE);
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62 | String collection = (String) params.get(GSParams.COLLECTION);
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63 |
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64 | // collection may be null or empty when we are doing cross coll services
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65 | if (collection == null || collection.equals(""))
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66 | {
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67 | collection = null;
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68 | }
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69 |
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70 | UserContext userContext = new UserContext(request);
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71 | String to = service_name;
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72 | if (collection != null)
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73 | {
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74 | to = GSPath.prependLink(to, collection);
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75 | }
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76 |
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77 | if (request_type.indexOf("d") != -1)
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78 | {
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79 | // we have been asked for the service description
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80 | Element mr_info_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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81 | Element mr_info_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, userContext);
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82 | mr_info_message.appendChild(mr_info_request);
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83 |
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84 | // process the message
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85 | Element mr_info_response = (Element) this.mr.process(mr_info_message);
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86 | // the response
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87 |
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88 | Element service_response = (Element) GSXML.getChildByTagName(mr_info_response, GSXML.RESPONSE_ELEM);
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89 |
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90 | Element service_description = (Element) this.doc.importNode(GSXML.getChildByTagName(service_response, GSXML.SERVICE_ELEM), true);
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91 | page_response.appendChild(service_description);
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92 | }
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93 |
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94 | if (request_type.indexOf("r") == -1)
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95 | {
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96 | // just a display request, no actual processing to do
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97 | //append site metadata
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98 | addSiteMetadata(page_response, userContext);
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99 | return page_response;
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100 | }
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101 |
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102 | // check that we have some service params
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103 | HashMap service_params = (HashMap) params.get("s1");
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104 | if (service_params == null)
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105 | { // no query
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106 | //append site metadata
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107 | addSiteMetadata(page_response, userContext);
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108 | return page_response;
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109 | }
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110 |
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111 | // create the query request
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112 | Element mr_query_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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113 | Element mr_query_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, userContext);
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114 | mr_query_message.appendChild(mr_query_request);
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115 |
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116 | Element query_param_list = this.doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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117 | GSXML.addParametersToList(this.doc, query_param_list, service_params);
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118 | mr_query_request.appendChild(query_param_list);
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119 |
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120 | // also get the format stuff now if there is some
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121 | Element format_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_FORMAT, to, userContext);
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122 | mr_query_message.appendChild(format_request);
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123 |
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124 | logger.debug(GSXML.xmlNodeToString(mr_query_message, false));
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125 |
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126 | // do the query
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127 | Element mr_query_response = (Element) this.mr.process(mr_query_message);
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128 |
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129 | // check for errors
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130 | if (processErrorElements(mr_query_response, page_response))
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131 | {
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132 | //append site metadata
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133 | addSiteMetadata(page_response, userContext);
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134 | return page_response;
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135 | }
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136 |
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137 | NodeList responses = mr_query_response.getElementsByTagName(GSXML.RESPONSE_ELEM);
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138 | Element query_response = (Element) responses.item(0);
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139 | Element format_response = (Element) responses.item(1);
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140 |
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141 | Element query_result_metadata_list = (Element) GSXML.getChildByTagName(query_response, GSXML.METADATA_ELEM + GSXML.LIST_MODIFIER);
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142 | if (query_result_metadata_list == null)
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143 | {
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144 | logger.error("No query result metadata.\n");
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145 | }
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146 | else
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147 | { // add it into the page response
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148 | page_response.appendChild(this.doc.importNode(query_result_metadata_list, true));
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149 | }
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150 |
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151 | Element query_term_info_list = (Element) GSXML.getChildByTagName(query_response, GSXML.TERM_ELEM + GSXML.LIST_MODIFIER);
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152 | if (query_term_info_list == null)
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153 | {
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154 | logger.error("No query term information.\n");
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155 | }
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156 | else
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157 | { // add it into the page response
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158 | page_response.appendChild(this.doc.importNode(query_term_info_list, true));
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159 | }
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160 |
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161 | // check that there are some documents - for now check the list, but later should use a numdocs metadata elem
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162 | Element document_list = (Element) GSXML.getChildByTagName(query_response, GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
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163 | // documentList not present if no docs found
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164 | if (document_list == null)
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165 | {
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166 | // add in a dummy doc node list - used by the display. need to think about this
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167 | page_response.appendChild(this.doc.createElement(GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER));
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168 | //append site metadata
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169 | addSiteMetadata(page_response, userContext);
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170 | return page_response;
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171 | }
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172 |
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173 | // now we check to see if there is metadata already - some search services return predefined metadata. if there is some, don't do a metadata request
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174 | NodeList doc_metadata = document_list.getElementsByTagName(GSXML.METADATA_ELEM + GSXML.LIST_MODIFIER);
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175 | if (doc_metadata.getLength() > 0)
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176 | {
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177 | logger.error("have already found metadata!");
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178 | // append the doc list to the result
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179 | page_response.appendChild(this.doc.importNode(document_list, true));
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180 | //append site metadata
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181 | addSiteMetadata(page_response, userContext);
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182 | return page_response;
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183 | }
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184 |
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185 | // get the metadata elements needed from the format statement if any
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186 | HashSet metadata_names = new HashSet();
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187 | metadata_names.add("Title");
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188 | // add in the format info to the stylesheet if there is any
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189 | Element format_elem = (Element) GSXML.getChildByTagName(format_response, GSXML.FORMAT_ELEM);
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190 | if (format_elem != null)
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191 | {
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192 | // set the format type
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193 | format_elem.setAttribute(GSXML.TYPE_ATT, "search");
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194 | // for now just add to the response
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195 | page_response.appendChild(this.doc.importNode(format_elem, true));
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196 | getRequiredMetadataNames(format_elem, metadata_names);
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197 | }
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198 |
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199 | // paging of the results is done here - we filter the list to remove unwanted entries before retrieving metadata
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200 | Element filtered_doc_list = filterDocList(params, service_params, document_list);
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201 |
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202 | // do the metadata request on the filtered list
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203 | Element mr_metadata_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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204 | to = "DocumentMetadataRetrieve";
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205 | if (collection != null)
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206 | {
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207 | to = GSPath.prependLink(to, collection);
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208 | }
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209 | Element mr_metadata_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, userContext);
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210 | mr_metadata_message.appendChild(mr_metadata_request);
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211 |
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212 | // just get all for now - the receptionist should perhaps pass in some
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213 | // metadata that it wants, and QueryAction should look through the format stuff to see if there is any other?
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214 |
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215 | Element dm_param_list = createMetadataParamList(metadata_names);
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216 |
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217 | mr_metadata_request.appendChild(dm_param_list);
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218 |
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219 | // add in the doc node list too
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220 | mr_metadata_request.appendChild(filtered_doc_list);
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221 |
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222 | Element mr_metadata_response = (Element) this.mr.process(mr_metadata_message);
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223 | // check for errors
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224 | processErrorElements(mr_metadata_response, page_response);
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225 |
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226 | Element metadata_response = (Element) GSXML.getChildByTagName(mr_metadata_response, GSXML.RESPONSE_ELEM);
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227 |
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228 | Element query_result_document_list = (Element) GSXML.getChildByTagName(metadata_response, GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
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229 |
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230 | if (query_result_document_list != null)
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231 | {
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232 | page_response.appendChild(this.doc.importNode(query_result_document_list, true));
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233 | }
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234 |
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235 | logger.debug("Query page:\n" + this.converter.getPrettyString(page_response));
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236 | //append site metadata
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237 | addSiteMetadata(page_response, userContext);
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238 | return page_response;
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239 | }
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240 |
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241 | /** this filters out some of the doc results for result paging */
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242 | protected Element filterDocList(HashMap params, HashMap service_params, Element orig_doc_list)
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243 | {
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244 |
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245 | // check the hits_per_page param - is it a service param??
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246 | String hits_pp = (String) service_params.get("hitsPerPage");
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247 | if (hits_pp == null)
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248 | {
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249 | // the service is doing the paging, so we want to display all of the returned docs(???)
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250 | // return (Element)this.doc.importNode(orig_doc_list, true);
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251 | // try hitsPerPage in the globle param
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252 | hits_pp = (String) params.get("hitsPerPage");
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253 | }
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254 |
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255 | int hits = 20;
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256 | if (hits_pp != null && !hits_pp.equals(""))
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257 | {
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258 | try
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259 | {
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260 | hits = Integer.parseInt(hits_pp);
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261 | }
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262 | catch (Exception e)
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263 | {
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264 | hits = 20;
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265 | }
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266 | }
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267 |
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268 | if (hits == -1)
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269 | { // all
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270 | return (Element) this.doc.importNode(orig_doc_list, true);
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271 | }
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272 | NodeList result_docs = orig_doc_list.getElementsByTagName(GSXML.DOC_NODE_ELEM);
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273 |
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274 | int num_docs = result_docs.getLength();
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275 | if (num_docs <= hits)
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276 | {
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277 | // too few docs to do paging
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278 | return (Element) this.doc.importNode(orig_doc_list, true);
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279 | }
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280 |
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281 | // now we need our own doc list
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282 | Element result_list = this.doc.createElement(GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
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283 |
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284 | String start_p = (String) service_params.get("startPage");
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285 | if (start_p == null)
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286 | {
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287 | start_p = (String) params.get("startPage");
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288 | }
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289 |
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290 | int start = 1;
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291 | if (start_p != null && !start_p.equals(""))
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292 | {
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293 | try
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294 | {
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295 | start = Integer.parseInt(start_p);
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296 | }
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297 | catch (Exception e)
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298 | {
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299 | start = 1;
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300 | }
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301 | }
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302 |
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303 | int start_from = (start - 1) * hits;
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304 | int end_at = (start * hits) - 1;
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305 |
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306 | if (start_from > num_docs)
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307 | {
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308 | // something has gone wrong
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309 | return result_list;
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310 | }
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311 |
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312 | if (end_at > num_docs)
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313 | {
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314 | end_at = num_docs - 1;
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315 | }
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316 |
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317 | // now we finally have the docs numbers to use
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318 | for (int i = start_from; i <= end_at; i++)
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319 | {
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320 | result_list.appendChild(this.doc.importNode(result_docs.item(i), true));
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321 | }
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322 |
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323 | return result_list;
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324 | }
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325 |
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326 | }
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