[8158] | 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.gsdl3.util.*;
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| 5 |
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| 6 | // XML classes
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| 7 | import org.w3c.dom.Element;
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| 8 | import org.w3c.dom.Document;
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| 9 | import org.w3c.dom.NodeList;
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| 10 |
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| 11 | import java.util.HashMap;
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| 12 | import java.io.File;
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| 13 | import java.io.InputStream;
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| 14 | import java.io.BufferedReader;
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| 15 | import java.io.InputStreamReader;
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| 16 | import java.io.IOException;
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| 17 | import java.net.HttpURLConnection;
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| 18 | import java.net.URLConnection;
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| 19 | import java.net.URL;
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| 20 | import java.net.Authenticator;
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| 21 | import java.net.MalformedURLException;
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| 22 |
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| 23 | /**
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| 24 | *
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| 25 | * @author <a href="mailto:[email protected]">Katherine Don</a>
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| 26 | * @version $Revision: 9874 $
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| 27 | */
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| 28 |
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| 29 | public class IViaProxy
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| 30 | extends ServiceRack {
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| 31 |
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| 32 | // the services on offer
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| 33 | // these strings must match what is found in the properties file
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| 34 | protected static final String TEXT_QUERY_SERVICE = "TextQuery";
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| 35 | protected static final String DOC_CONTENT_SERVICE = "DocumentContentRetrieve";
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| 36 | protected static final String DOC_META_SERVICE = "DocumentMetadataRetrieve";
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| 37 | protected static final String QUERY_PARAM = "query";
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| 38 | protected static final String FIELD_PARAM = "fields";
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| 39 | // have standard gs param names for hits per page, and start page
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| 40 | // these need to be mapped to iVia params
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| 41 | protected static final String GS_HITS_PARAM = "hitsPerPage";
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| 42 | protected static final String IM_HITS_PARAM = "no_of_records_per_page";
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| 43 | protected static final String GS_START_PAGE_PARAM = "startPage";
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| 44 | protected static final String IM_START_PAGE_PARAM = "start_page_no";
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| 45 |
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| 46 | protected String ivia_server_url = null;
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| 47 |
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| 48 | public boolean configure(Element info, Element extra_info) {
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| 49 |
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| 50 | Element server_elem = (Element)GSXML.getChildByTagName(info, "iViaServer");
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| 51 | if (server_elem == null) {
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| 52 | System.err.println("IViaProxy.configure error: no iViaServer element found");
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| 53 | return false;
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| 54 | }
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| 55 | ivia_server_url = server_elem.getAttribute("url");
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| 56 | if (ivia_server_url.equals("")) {
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| 57 | System.err.println("IViaProxy.configure error: no url for the iViaServer element");
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| 58 | return false;
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| 59 | }
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| 60 | Element tq_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 61 | tq_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_QUERY);
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| 62 | tq_service.setAttribute(GSXML.NAME_ATT, TEXT_QUERY_SERVICE);
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| 63 | this.short_service_info.appendChild(tq_service);
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| 64 |
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| 65 | Element dc_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 66 | dc_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 67 | dc_service.setAttribute(GSXML.NAME_ATT, DOC_CONTENT_SERVICE);
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| 68 | this.short_service_info.appendChild(dc_service);
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| 69 |
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| 70 | Element dm_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 71 | dm_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 72 | dm_service.setAttribute(GSXML.NAME_ATT, DOC_META_SERVICE);
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| 73 | this.short_service_info.appendChild(dm_service);
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| 74 |
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| 75 | //
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| 76 | // add some format info to service map if there is any
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| 77 | String path = GSPath.appendLink(GSXML.SEARCH_ELEM, GSXML.FORMAT_ELEM);
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| 78 | Element format = (Element) GSXML.getNodeByPath(extra_info, path);
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| 79 | if (format != null) {
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| 80 | this.format_info_map.put(TEXT_QUERY_SERVICE, this.doc.importNode(format, true));
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| 81 | }
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| 82 |
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| 83 |
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| 84 | // look for document display format
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| 85 | path = GSPath.appendLink(GSXML.DISPLAY_ELEM, GSXML.FORMAT_ELEM);
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| 86 | Element display_format = (Element)GSXML.getNodeByPath(extra_info, path);
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| 87 | if (display_format != null) {
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| 88 | this.format_info_map.put(DOC_CONTENT_SERVICE, this.doc.importNode(display_format, true));
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| 89 | // shoudl we make a copy?
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| 90 | }
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| 91 |
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| 92 | return true;
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| 93 |
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| 94 | }
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| 95 |
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| 96 | protected Element getServiceDescription(String service, String lang, String subset) {
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| 97 |
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| 98 | if (service.equals(TEXT_QUERY_SERVICE)) {
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| 99 | Element tq_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 100 | tq_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_QUERY);
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| 101 | tq_service.setAttribute(GSXML.NAME_ATT, TEXT_QUERY_SERVICE);
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| 102 | if (subset == null || subset.equals(GSXML.DISPLAY_TEXT_ELEM + GSXML.LIST_MODIFIER)) {
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| 103 | tq_service.appendChild(GSXML.createDisplayTextElement(this.doc, GSXML.DISPLAY_TEXT_NAME, getTextString(TEXT_QUERY_SERVICE+".name", lang)));
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| 104 | tq_service.appendChild(GSXML.createDisplayTextElement(this.doc, GSXML.DISPLAY_TEXT_SUBMIT, getTextString(TEXT_QUERY_SERVICE+".submit", lang)));
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| 105 | tq_service.appendChild(GSXML.createDisplayTextElement(this.doc, GSXML.DISPLAY_TEXT_DESCRIPTION, getTextString(TEXT_QUERY_SERVICE+".description", lang)));
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| 106 | }
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| 107 | if (subset == null || subset.equals(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER)) {
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| 108 | Element param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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| 109 | tq_service.appendChild(param_list);
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| 110 | Element param = GSXML.createParameterDescription(this.doc, QUERY_PARAM, getTextString("param."+QUERY_PARAM, lang), GSXML.PARAM_TYPE_STRING, null, null, null);
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| 111 | param_list.appendChild(param);
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| 112 | String [] field_ids = {"kw", "au", "su", "ti", "de", "fu"};
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| 113 | String [] field_names = {
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| 114 | getTextString("param."+FIELD_PARAM+".kw", lang),
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| 115 | getTextString("param."+FIELD_PARAM+".au", lang),
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| 116 | getTextString("param."+FIELD_PARAM+".su", lang),
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| 117 | getTextString("param."+FIELD_PARAM+".ti", lang),
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| 118 | getTextString("param."+FIELD_PARAM+".de", lang),
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| 119 | getTextString("param."+FIELD_PARAM+".fu", lang) };
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| 120 |
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| 121 | param = GSXML.createParameterDescription(this.doc, FIELD_PARAM, getTextString("param."+FIELD_PARAM, lang), GSXML.PARAM_TYPE_ENUM_MULTI, "kw,au,su,ti,de,fu", field_ids, field_names);
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| 122 | param_list.appendChild(param);
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| 123 |
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| 124 |
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| 125 | String [] hits_options = {"10", "30", "50"};
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| 126 | param = GSXML.createParameterDescription(this.doc, GS_HITS_PARAM, getTextString("param."+GS_HITS_PARAM, lang), GSXML.PARAM_TYPE_ENUM_SINGLE, "10", hits_options, hits_options);
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| 127 | param_list.appendChild(param);
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| 128 |
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| 129 | param = GSXML.createParameterDescription(this.doc, GS_START_PAGE_PARAM, "", GSXML.PARAM_TYPE_INVISIBLE, "1", null, null);
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| 130 | param_list.appendChild(param);
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| 131 | }
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| 132 | return tq_service;
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| 133 | }
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| 134 | if (service.equals(DOC_META_SERVICE)) {
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| 135 | Element dm_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 136 | dm_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 137 | dm_service.setAttribute(GSXML.NAME_ATT, DOC_META_SERVICE);
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| 138 | return dm_service;
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| 139 |
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| 140 | }
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| 141 | if (service.equals(DOC_CONTENT_SERVICE)) {
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| 142 | Element dc_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 143 | dc_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 144 | dc_service.setAttribute(GSXML.NAME_ATT, DOC_CONTENT_SERVICE);
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| 145 | return dc_service;
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| 146 |
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| 147 |
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| 148 | }
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| 149 | return null;
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| 150 | }
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| 151 |
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| 152 | /** Process a text query - implemented by concrete subclasses */
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| 153 | protected Element processTextQuery(Element request) {
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| 154 |
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| 155 | // Create a new (empty) result message
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| 156 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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| 157 | result.setAttribute(GSXML.FROM_ATT, TEXT_QUERY_SERVICE);
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| 158 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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| 159 | Element doc_node_list = this.doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 160 | result.appendChild(doc_node_list);
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| 161 |
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| 162 |
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| 163 | Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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| 164 | if (param_list == null) {
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| 165 | System.err.println("IViaProxy Error:: TextQuery request had no paramList.");
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| 166 | return result; // Return the empty result
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| 167 | }
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| 168 |
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| 169 | // Process the request parameters
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| 170 | HashMap params = GSXML.extractParams(param_list, false);
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| 171 |
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| 172 | // Make sure a query has been specified
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| 173 | String query = (String) params.get(QUERY_PARAM);
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| 174 | if (query == null || query.equals("")) {
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| 175 | return result; // Return the empty result
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| 176 | }
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| 177 | // tidy whitespace
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| 178 | query = query.replaceAll("\\s+", "+");
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| 179 | String url_string = ivia_server_url+"/cgi-bin/canned_search?theme=gsdl3&query="+query;
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| 180 |
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| 181 | // check for fields
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| 182 | String fields = (String) params.get(FIELD_PARAM);
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| 183 | if (fields != null && !fields.equals("")) {
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| 184 | url_string += "&fields="+fields;
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| 185 | }
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| 186 |
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| 187 | //check for hits per page
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| 188 | String hits_per_page = (String) params.get(GS_HITS_PARAM);
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| 189 | if (hits_per_page != null && !hits_per_page.equals("")) {
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| 190 | url_string += "&"+IM_HITS_PARAM+"="+hits_per_page;
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| 191 | }
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| 192 |
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| 193 | // check for start page
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| 194 | String start_page = (String) params.get(GS_START_PAGE_PARAM);
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| 195 | if (start_page != null && !start_page.equals("")) {
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| 196 | url_string += "&"+IM_START_PAGE_PARAM+"="+start_page;
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| 197 | }
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| 198 | String results_num = null;
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| 199 | String doc_ids = null;
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| 200 | try {
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| 201 | ///ystem.err.println("IViaProxy, sending "+url_string);
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| 202 | BufferedReader reader = makeConnection(url_string);
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| 203 | results_num = reader.readLine();
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| 204 | doc_ids = reader.readLine();
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| 205 |
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| 206 | } catch (Exception e) {
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| 207 | System.err.println("IViaProxy.TextQuery Error: exception happened during query");
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| 208 | e.printStackTrace();
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| 209 | return result;
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| 210 | }
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| 211 |
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| 212 | if (results_num.startsWith("Resources: ")) {
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| 213 | results_num = results_num.substring(11);
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| 214 | } else {
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| 215 | System.err.println("IViaProxy.TextQuery Error: badly formatted results line: "+results_num);
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| 216 | return result;
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| 217 | }
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| 218 | if (doc_ids.startsWith("Ids: ")) {
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| 219 | doc_ids = doc_ids.substring(5).trim();
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| 220 | } else {
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| 221 | System.err.println("IViaProxy.TextQuery Error: badly formatted docs line: "+doc_ids);
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| 222 | return result;
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| 223 | }
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| 224 |
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| 225 | // get the num docs and add to a metadata list
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| 226 | Element metadata_list = this.doc.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
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| 227 | result.appendChild(metadata_list);
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| 228 |
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| 229 | // Add a metadata element specifying the number of matching documents
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| 230 | long numdocs = Long.parseLong(results_num);
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| 231 | GSXML.addMetadata(this.doc, metadata_list, "numDocsMatched", ""+numdocs);
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| 232 | String [] ids = doc_ids.split(" ");
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| 233 |
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| 234 | for (int d=0; d<ids.length; d++) {
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| 235 | Element doc_node = this.doc.createElement(GSXML.DOC_NODE_ELEM);
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| 236 | doc_node.setAttribute(GSXML.NODE_ID_ATT, ids[d]);
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| 237 | doc_node_list.appendChild(doc_node);
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| 238 | }
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| 239 | ///ystem.err.println("IViaProxy result:");
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| 240 | ///ystem.err.println(this.converter.getString(result));
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| 241 | return result;
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| 242 |
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| 243 | }
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| 244 |
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| 245 | protected Element processDocumentMetadataRetrieve(Element request) {
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| 246 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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| 247 | result.setAttribute(GSXML.FROM_ATT, DOC_META_SERVICE);
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| 248 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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| 249 |
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| 250 | // Get the parameters of the request
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| 251 | Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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| 252 | if (param_list == null) {
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| 253 | System.err.println("IViaProxy.DocumentMetadataRetrieve Error: missing paramList.\n");
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| 254 | return result; // Return the empty result
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| 255 | }
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| 256 |
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| 257 | // The metadata information required
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| 258 | StringBuffer field_list = new StringBuffer();
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| 259 | Element param = (Element) param_list.getFirstChild();
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| 260 | while (param != null) {
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| 261 | // Identify the metadata information desired
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| 262 | if (param.getAttribute(GSXML.NAME_ATT).equals("metadata")) {
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| 263 | String metadata = GSXML.getValue(param);
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| 264 | if (isAcceptableMetadata(metadata)) {
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| 265 | field_list.append(metadata);
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| 266 | field_list.append(",");
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| 267 | }
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| 268 | }
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| 269 | param = (Element) param.getNextSibling();
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| 270 | }
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| 271 |
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| 272 | if (field_list.length()==0) {
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| 273 | System.err.println("IViaProxy.DocumentMetadataRetrieve Error: no metadata specified.\n");
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| 274 | return result;
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| 275 | }
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| 276 |
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| 277 | // Get the documents
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| 278 | Element request_node_list = (Element) GSXML.getChildByTagName(request, GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 279 | if (request_node_list == null) {
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| 280 | System.err.println("IViaProxy Error: DocumentMetadataRetrieve request had no "+GSXML.DOC_NODE_ELEM+"List.\n");
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| 281 | return result;
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| 282 | }
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| 283 |
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| 284 | StringBuffer record_id_list = new StringBuffer();
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| 285 |
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| 286 | NodeList request_nodes = request_node_list.getChildNodes();
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| 287 | for (int i = 0; i < request_nodes.getLength(); i++) {
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| 288 | Element request_node = (Element) request_nodes.item(i);
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| 289 | String node_id = request_node.getAttribute(GSXML.NODE_ID_ATT);
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| 290 | record_id_list.append(node_id);
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| 291 | record_id_list.append(",");
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| 292 | }
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| 293 |
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| 294 | // do the query to the iVia server
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| 295 | String url_string = ivia_server_url+"/cgi-bin/view_record_set?theme=gsdl3&record_id_list="+record_id_list.toString()+"&field_list="+field_list.toString();
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| 296 |
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| 297 | Element node_list = this.doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 298 | result.appendChild(node_list);
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| 299 | try {
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| 300 | BufferedReader reader = makeConnection(url_string);
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| 301 | String line;
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| 302 | while ((line = reader.readLine()) != null) {
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| 303 | if (!line.startsWith("Record:")) {
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| 304 | continue;
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| 305 | }
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| 306 | // the first line is the record
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| 307 | line=line.substring(8);
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| 308 | Element doc_node = this.doc.createElement(GSXML.DOC_NODE_ELEM);
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| 309 | doc_node.setAttribute(GSXML.NODE_ID_ATT, line);
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| 310 | Element meta_list = this.doc.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
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| 311 | doc_node.appendChild(meta_list);
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| 312 | while ((line = reader.readLine()) != null) {
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| 313 | //metadata entry
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| 314 | int col_pos = line.indexOf(':');
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| 315 | if (col_pos == -1) {
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| 316 | // end of the metadata for this doc
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| 317 | break;
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| 318 | }
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| 319 | String name = line.substring(0,col_pos);
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| 320 | String value = line.substring(col_pos+2); // includes a space
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| 321 | GSXML.addMetadata(this.doc, meta_list, name, value);
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| 322 | }
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| 323 | node_list.appendChild(doc_node);
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| 324 |
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| 325 | }
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| 326 | } catch (Exception e) {
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| 327 | System.err.println("IViaProxy Error:exception happened");
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| 328 | e.printStackTrace();
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| 329 | }
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| 330 | ///ystem.out.println("IViaProxy: returning result: ");
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| 331 | ///ystem.out.println(this.converter.getPrettyString(result));
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| 332 | return result;
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| 333 |
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| 334 | }
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| 335 |
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| 336 | protected Element processDocumentContentRetrieve(Element request) {
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| 337 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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| 338 | result.setAttribute(GSXML.FROM_ATT, DOC_CONTENT_SERVICE);
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| 339 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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| 340 |
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| 341 | // Get the request doc_list
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| 342 | Element query_doc_list = (Element) GSXML.getChildByTagName(request, GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 343 | if (query_doc_list == null) {
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| 344 | System.err.println("IViaProxy Error: DocumentContentRetrieve request specified no doc nodes.\n");
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| 345 | return result;
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| 346 | }
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| 347 |
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| 348 | Element doc_list = this.doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 349 | result.appendChild(doc_list);
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| 350 |
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| 351 | // Get the documents
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| 352 | String[] doc_ids = GSXML.getAttributeValuesFromList(query_doc_list,
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| 353 | GSXML.NODE_ID_ATT);
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| 354 | for (int i = 0; i < doc_ids.length; i++) {
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| 355 | String doc_id = doc_ids[i];
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| 356 | Element doc_node = getDocument(doc_id);
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| 357 | doc_list.appendChild(doc_node);
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| 358 | }
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| 359 | return result;
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| 360 |
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| 361 | }
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| 362 |
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| 363 |
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| 364 | /** gets a document by sending a request to iVia, then processes it and creates a documentNode around the text */
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| 365 | protected Element getDocument(String doc_id) {
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| 366 |
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| 367 | String url_string = ivia_server_url+"/cgi-bin/view_record?theme=gsdl3&record_id="+doc_id;
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| 368 | StringBuffer buffer = new StringBuffer();
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| 369 | try {
|
---|
| 370 | BufferedReader reader = makeConnection(url_string);
|
---|
| 371 |
|
---|
| 372 | String line;
|
---|
| 373 | while((line = reader.readLine())!= null) {
|
---|
| 374 | buffer.append(line);
|
---|
| 375 | }
|
---|
| 376 |
|
---|
| 377 |
|
---|
| 378 | } catch (Exception e) {
|
---|
| 379 | System.err.println("IViaProxy Error:exception happened");
|
---|
| 380 | e.printStackTrace();
|
---|
| 381 | }
|
---|
| 382 |
|
---|
| 383 | String node_content = buffer.toString();
|
---|
| 384 | String escaped_content = GSXML.xmlSafe(node_content);
|
---|
| 385 |
|
---|
| 386 | StringBuffer processed_content = new StringBuffer(escaped_content.length());
|
---|
| 387 | processed_content.append("<nodeContent>");
|
---|
| 388 | int pos = 0;
|
---|
| 389 | int lastpos = 0;
|
---|
| 390 | while ((pos = escaped_content.indexOf("<a ", lastpos))!= -1) {
|
---|
| 391 | processed_content.append(escaped_content.substring(lastpos, pos));
|
---|
| 392 | int endpos = escaped_content.indexOf("</a>", pos);
|
---|
| 393 | if (endpos == -1) {
|
---|
| 394 | break;
|
---|
| 395 | }
|
---|
| 396 | String link = escaped_content.substring(pos, endpos+10);
|
---|
| 397 | link = convertLink(link);
|
---|
| 398 | processed_content.append(link);
|
---|
| 399 | lastpos = endpos+10;
|
---|
| 400 | }
|
---|
| 401 | processed_content.append(escaped_content.substring(lastpos)); // get the last bit
|
---|
| 402 | processed_content.append("</nodeContent>");
|
---|
| 403 |
|
---|
| 404 | Element doc_node = this.doc.createElement(GSXML.DOC_NODE_ELEM);
|
---|
| 405 | doc_node.setAttribute(GSXML.NODE_ID_ATT, doc_id);
|
---|
| 406 |
|
---|
[9874] | 407 | Document content_doc = this.converter.getDOM(processed_content.toString());
|
---|
| 408 | if (content_doc != null) {
|
---|
| 409 | Element content_element = content_doc.getDocumentElement();
|
---|
| 410 | doc_node.appendChild(this.doc.importNode(content_element, true));
|
---|
| 411 | } else {
|
---|
| 412 | System.err.println("IViaProxy.getDocument Error: Couldn't parse the node content");
|
---|
| 413 | }
|
---|
[8158] | 414 | return doc_node;
|
---|
| 415 |
|
---|
| 416 | }
|
---|
| 417 |
|
---|
| 418 | /** converts a url from an <a> element into a greenstone suitable one */
|
---|
| 419 | protected String convertLink(String aref) {
|
---|
| 420 |
|
---|
| 421 | if (aref.indexOf("href="http") != -1) {
|
---|
| 422 | return aref; // an external link
|
---|
| 423 | }
|
---|
| 424 | String type = "other";
|
---|
| 425 | if (aref.indexOf("/cgi-bin/canned_search")!=-1) {
|
---|
| 426 | type="query";
|
---|
| 427 | } else if (aref.indexOf("/cgi-bin/click_through") != -1) {
|
---|
| 428 | type = "external";
|
---|
| 429 | } else if (aref.indexOf("/cgi-bin/view_record") != -1) {
|
---|
| 430 | type="document";
|
---|
| 431 | }
|
---|
| 432 |
|
---|
| 433 | int href_start = aref.indexOf("href="")+11;
|
---|
| 434 | int href_end = aref.indexOf(">", href_start);
|
---|
| 435 | String href = aref.substring(href_start, href_end);
|
---|
| 436 | String link_content = aref.substring(href_end+4, aref.length()-10);
|
---|
| 437 |
|
---|
| 438 | if (type.equals("external")) {
|
---|
| 439 | // the external link is everything after the http at the end.
|
---|
| 440 | String address = href.substring(href.lastIndexOf("http"));
|
---|
| 441 | address = address.replaceAll("%3[aA]", ":");
|
---|
| 442 | address = address.replaceAll("%2[fF]", "/");
|
---|
| 443 |
|
---|
| 444 | return "<a href=\""+address+"\">"+link_content+"</a>";
|
---|
| 445 | }
|
---|
| 446 | if (type.equals("other")) {
|
---|
| 447 | return "other type of link ("+link_content+")";
|
---|
| 448 | }
|
---|
| 449 | StringBuffer result = new StringBuffer();
|
---|
| 450 | result.append("<link type='");
|
---|
| 451 | result.append(type);
|
---|
| 452 | result.append("'");
|
---|
| 453 | if (type.equals("query")) {
|
---|
| 454 | result.append(" service='TextQuery'");
|
---|
| 455 | }
|
---|
| 456 | result.append(">");
|
---|
| 457 | // add in the parameters
|
---|
| 458 | href = href.substring(href.indexOf("?")+1);
|
---|
| 459 | String [] params = href.split("&");
|
---|
| 460 | for (int i=0; i<params.length; i++) {
|
---|
| 461 | String param = params[i];
|
---|
| 462 | int eq_pos = param.indexOf("=");
|
---|
| 463 | if (eq_pos != -1) {
|
---|
| 464 |
|
---|
| 465 | result.append("<param name='"+param.substring(0, eq_pos)+"' value='"+param.substring(eq_pos+1)+"'/>");
|
---|
| 466 | }
|
---|
| 467 | }
|
---|
| 468 | result.append(link_content);
|
---|
| 469 | result.append("</link>");
|
---|
| 470 |
|
---|
| 471 | return result.toString();
|
---|
| 472 |
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 475 | // iVia craps out if we ask for a metadata which is not valid. So need
|
---|
| 476 | // to make sure we only ask for acceptable fields.
|
---|
| 477 | protected boolean isAcceptableMetadata(String meta) {
|
---|
| 478 | String valid_metadata = ",title,url,ivia_description,keywords,subjects,";
|
---|
| 479 | if (valid_metadata.indexOf(","+meta+",")!=-1) {
|
---|
| 480 | return true;
|
---|
| 481 | }
|
---|
| 482 | return false;
|
---|
| 483 | }
|
---|
| 484 | protected BufferedReader makeConnection(String url_string) {
|
---|
| 485 | BufferedReader reader = null;
|
---|
| 486 | try {
|
---|
| 487 | URL url = new URL(url_string);
|
---|
| 488 | HttpURLConnection connection = (HttpURLConnection)url.openConnection();
|
---|
| 489 | InputStream input = connection.getInputStream();
|
---|
| 490 | reader = new BufferedReader(new InputStreamReader(input));
|
---|
| 491 | } catch (java.net.MalformedURLException e) {
|
---|
| 492 |
|
---|
| 493 | System.err.println("IViaProxy Error: Malformed URL: "+url_string);
|
---|
| 494 | } catch (java.io.IOException e) {
|
---|
| 495 | System.err.println("IViaProxy Error: An error occurred during IO to url "+url_string);
|
---|
| 496 | }
|
---|
| 497 | return reader;
|
---|
| 498 | }
|
---|
| 499 |
|
---|
| 500 | }
|
---|