source: trunk/gsdl3/src/java/org/greenstone/gsdl3/service/GSDL2ClassifierServices.java@ 3567

Last change on this file since 3567 was 3567, checked in by kjdon, 21 years ago

tidied up a bit, using new Dictionary stuff
  • Property svn:keywords set to Author Date Id Revision
File size: 8.8 KB
Line 
1/*
2 * GSDL2ClassifierServices.java
3 * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19package org.greenstone.gsdl3.service;
20
21import org.greenstone.gdbm.*;
22import org.greenstone.gsdl3.util.*;
23
24import org.w3c.dom.Document;
25import org.w3c.dom.Node;
26import org.w3c.dom.Text;
27import org.w3c.dom.Element;
28import org.w3c.dom.NodeList;
29/**
30 * A ServicesImpl class for GSDL2-style Classifiers
31 *
32 * @author <a href="mailto:[email protected]">Katherine Don</a>
33 * @version $Revision: 3567 $
34 */
35public class GSDL2ClassifierServices
36 extends ServicesImpl {
37
38 // the services on offer
39 private static final String CLASSIFIER_SERVICE = "ClassifierBrowse";
40
41 /** gdbm wrapper */
42 private GDBMWrapper gdbm_src_=null;
43
44 public GSDL2ClassifierServices() {
45 gdbm_src_ = new GDBMWrapper();
46
47 }
48
49 /** creates a display element containing all the text strings needed to display the service page, in the language specified */
50 protected Element createServiceDisplay(String service, String lang) {
51 Element display = doc_.createElement(GSXML.DISPLAY_ELEM);
52 display.appendChild(GSXML.createTextElement(doc_, GSXML.DISPLAY_NAME_ELEM, getTextString(service+".name", lang)));
53 display.appendChild(GSXML.createTextElement(doc_, GSXML.DISPLAY_SUBMIT_ELEM, getTextString(service+".submit", lang)));
54
55 Element param;
56
57 return display;
58
59 }
60
61 /** processes the request */
62 protected Element processService(String name, Element request) {
63
64 if (!name.equals(CLASSIFIER_SERVICE)) {
65 System.err.println("GSDL2ClassifierServices:should never get here. service type wrong:"+name);
66 return null;
67 }
68 // the response element
69 Element result = doc_.createElement(GSXML.RESPONSE_ELEM);
70 String from = GSPath.appendLink(cluster_name_, CLASSIFIER_SERVICE);
71 result.setAttribute(GSXML.FROM_ATT, from);
72 result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_QUERY);
73 Element result_content = doc_.createElement(GSXML.CONTENT_ELEM);
74 result.appendChild(result_content);
75
76 // get the classifier name out of request content - assume only one for now
77 String path = GSXML.CONTENT_ELEM;
78 path = GSPath.appendLink(path, GSXML.RESOURCE_ELEM+GSXML.LIST_MODIFIER);
79 path = GSPath.appendLink(path, GSXML.RESOURCE_ELEM);
80
81 Element elem = (Element)GSXML.getNodeByPath(request, path);
82 String elem_name = elem.getAttribute(GSXML.NAME_ATT);
83 System.out.println("elem name="+elem_name);
84
85 if (OID.needsTranslating(elem_name)) {
86 System.out.println("translating oid");
87 elem_name = gdbm_src_.translateOID(elem_name);
88 }
89 // get the info from gdbm db
90 DBInfo info = gdbm_src_.getInfo(elem_name);
91
92 // build up the XML
93 Element classifier = doc_.createElement(GSXML.CLASSIFIER_ELEM);
94
95 String classifier_name = OID.getTop(elem_name);
96 classifier.setAttribute(GSXML.NAME_ATT, classifier_name);
97 result_content.appendChild(classifier);
98 DBInfo top_info;
99
100 if (elem_name.equals(classifier_name)) {
101 top_info = info;
102 } else {
103 top_info = gdbm_src_.getInfo(classifier_name);
104 }
105
106 // a substitute template - should be read from config file
107 //String extra = "<stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'><xsl:template match='resource' priority='3'><xsl:param name='collName'>coll-name</xsl:param><xsl:variable name='library' select='ancestor::page/config/library_name'/><td><a href='{$library}?a=r&amp;c={$collName}&amp;r={@name}'><img src='interfaces/default/images/book.gif' width='18' height='11' border='0'/></a></td><td>***</td><td><xsl:value-of select='metadataList/metadata[@name=\"Title\"]'/></td></xsl:template></stylesheet>";
108 //Element extra_doc = converter_.getDOM(extra).getDocumentElement();
109 //result.appendChild(doc_.importNode(extra_doc, true));
110
111 // get the classifier attributes
112 String type = top_info.getInfo("childtype");
113 if (type.equals("VList")) {
114
115 classifier.setAttribute("type", "vertical");
116 classifier.setAttribute("interleave", "true");
117 classifier.setAttribute("link", "icon");
118 }
119 else if (type.equals("HList")){
120 classifier.setAttribute("type", "horizontal");
121 classifier.setAttribute("interleave", "false");
122 classifier.setAttribute("link", "name");
123 } else {
124 System.out.println("unknown type!!! check this");
125 classifier.setAttribute("type", "vertical");
126 classifier.setAttribute("interleave", "true");
127 classifier.setAttribute("link", "icon");
128 }
129
130 Element this_node;
131 if (elem_name.equals(classifier_name)) {
132 this_node = classifier;
133 } else { // have to build up the parents
134 // the current node
135 this_node = doc_.createElement("node");
136 this_node.setAttribute("name", elem_name);
137 type = info.getInfo("childtype");
138 if (type.equals("VList")) {
139 this_node.setAttribute("type", "vertical");
140 } else {
141 this_node.setAttribute("type", "horzizontal");
142 }
143 String title = info.getInfo("Title");
144 Element meta_list = doc_.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
145 GSXML.addMetadata(doc_, meta_list, "Title", title);
146 this_node.appendChild(meta_list);
147
148 System.out.println("classifier_name="+classifier_name);
149 System.out.println("this name="+elem_name);
150 // the parents
151 String middle_name = OID.getParent(elem_name);
152 Element middle_node = this_node;
153 while (!middle_name.equals(classifier_name)) {
154 System.out.println("middle_name="+middle_name);
155 // add in a new node
156 Element temp_node = doc_.createElement("node");
157 temp_node.setAttribute("name", middle_name);
158
159 DBInfo i = gdbm_src_.getInfo(middle_name);
160 type = i.getInfo("childtype");
161 if (type.equals("VList")) {
162 temp_node.setAttribute("type", "vertical");
163 } else {
164 temp_node.setAttribute("type", "horzizontal");
165 }
166 title = i.getInfo("Title");
167 meta_list = doc_.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
168 GSXML.addMetadata(doc_, meta_list, "Title", title);
169 temp_node.appendChild(meta_list);
170
171 // link into the tree
172 temp_node.appendChild(middle_node);
173 middle_node = temp_node;
174 middle_name = OID.getParent(middle_name);
175 }
176 classifier.appendChild(middle_node);
177 }
178 // get the child nodes
179 String contains = info.getInfo("contains");
180 // replace the " with parent name
181 contains = OID.translateParent(contains, elem_name);
182 String [] children = contains.split(";");
183 for (int i=0; i<children.length; i++) {
184 String child = children[i];
185 DBInfo child_info = gdbm_src_.getInfo(child);
186 String title = child_info.getInfo("Title");
187 Element node;
188 if (child.startsWith("HASH")) {
189 // a resource
190 node = doc_.createElement(GSXML.RESOURCE_ELEM);
191 } else { // a node in the classification
192 node = doc_.createElement("node");
193
194 }
195
196 node.setAttribute(GSXML.NAME_ATT, child);
197 Element meta_list = doc_.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
198 GSXML.addMetadata(doc_, meta_list, "Title", title);
199 node.appendChild(meta_list);
200 this_node.appendChild(node);
201
202 }
203
204 return result;
205
206 }
207
208
209 /** configure this service */
210 public boolean configure(Element info) {
211
212 System.out.println("configuring GSDL2ClassifierServices");
213
214 Element e = null;
215 // these entries should reflect the build config file - some services may not be available depending on how the colleciton was built.
216 // set up short_service_info_ - for now just has name and type
217 e = doc_.createElement(GSXML.SERVICE_ELEM);
218 e.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_QUERY);
219 e.setAttribute(GSXML.NAME_ATT, CLASSIFIER_SERVICE);
220 short_service_info_.appendChild(e);
221
222 // set up service_info_map_ - for now, just has the same elements as above
223 // should have full details about each service incl params lists etc.
224 e = doc_.createElement(GSXML.SERVICE_ELEM);
225 e.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_QUERY);
226 e.setAttribute(GSXML.NAME_ATT, CLASSIFIER_SERVICE);
227
228 // get the classifier list out of the service info
229 Node classList = GSXML.getChildByTagName(info, GSXML.CLASSIFIER_ELEM+GSXML.LIST_MODIFIER);
230 e.appendChild(doc_.importNode(classList, true));
231
232 service_info_map_.put(CLASSIFIER_SERVICE, e);
233
234 if (gdbm_src_.openDatabase(GSFile.GDBMDatabaseFile(site_home_, cluster_name_), GDBMWrapper.READER)) {
235 return true;
236 }
237 else {
238 System.err.println("couldn't open gdbm database!");
239 return false;
240 }
241
242 }
243
244
245}
246
247
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