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1
11 package org.eclipse.help.internal.search;
12
13 import java.io.*;
14 import java.net.*;
15 import java.util.Hashtable  ;
16
17 import javax.xml.parsers.*;
18
19 import org.eclipse.core.runtime.*;
20 import org.eclipse.help.IHelpResource;
21 import org.eclipse.help.internal.base.*;
22 import org.eclipse.help.search.ISearchEngine;
23 import org.eclipse.help.search.ISearchEngineResult;
24 import org.eclipse.help.search.ISearchEngineResultCollector;
25 import org.eclipse.help.search.ISearchScope;
26 import org.w3c.dom.*;
27 import org.xml.sax.*;
28
29
46
47 public final class InfoCenter implements ISearchEngine {
48 private Hashtable tocs;
49
50 public static class Scope implements ISearchScope {
51 String url;
52
53 boolean searchSelected;
54
55 String [] tocs;
56
57 public Scope(String url, boolean searchSelected, String [] tocs) {
58 this.url = url;
59 this.searchSelected = searchSelected;
60 this.tocs = tocs;
61 }
62 }
63
64 private class InfoCenterResult implements ISearchEngineResult {
65 private IHelpResource category;
66
67 private Element node;
68
69 private String baseURL;
70
71 public InfoCenterResult(String baseURL, Element node) {
72 this.baseURL = baseURL;
73 this.node = node;
74 createCategory(node);
75 }
76
77 private void createCategory(Element node) {
78 final String href = node.getAttribute("toc"); final String label = node.getAttribute("toclabel"); if (href != null && label != null) {
81 category = (IHelpResource) tocs.get(href);
82 if (category == null) {
83 category = new IHelpResource() {
84 public String getLabel() {
85 return label;
86 }
87
88 public String getHref() {
89 return href;
90 }
91 };
92 tocs.put(href, category);
93 }
94 }
95 }
96
97 public String getLabel() {
98 return node.getAttribute("label"); }
100
101 public String getDescription() {
102 return null;
103 }
104
105 public IHelpResource getCategory() {
106 return category;
107 }
108
109 public String getHref() {
110 return node.getAttribute("href"); }
112
113 public float getScore() {
114 String value = node.getAttribute("score"); if (value != null)
116 return Float.parseFloat(value);
117 return (float) 0.0;
118 }
119
120 public boolean getForceExternalWindow() {
121 return false;
122 }
123
124 public String toAbsoluteHref(String href, boolean frames) {
125 String url = baseURL;
126 if (!url.endsWith("/")) url = url + "/"; if (frames) {
129 return url + "topic" + href; }
131 return url + "topic" + href + "&noframes=true"; }
133 }
134
135
138 public InfoCenter() {
139 tocs = new Hashtable ();
140 }
141
142
148 public void run(String query, ISearchScope scope,
149 ISearchEngineResultCollector collector, IProgressMonitor monitor)
150 throws CoreException {
151 URL url = createURL(query, (Scope) scope);
152 if (url == null)
153 return;
154 InputStream is = null;
155 tocs.clear();
156 try {
157 URLConnection connection = url.openConnection();
158 monitor.beginTask(HelpBaseResources.InfoCenter_connecting, 5);
159 is = connection.getInputStream();
160 BufferedReader reader = new BufferedReader(new InputStreamReader(
161 is, "utf-8")); monitor.worked(1);
163 load(((Scope) scope).url, reader, collector,
164 new SubProgressMonitor(monitor, 4));
165 reader.close();
166 } catch (FileNotFoundException e) {
167 reportError(HelpBaseResources.InfoCenter_fileNotFound, e, collector);
168 } catch (IOException e) {
169 reportError(HelpBaseResources.InfoCenter_io, e, collector);
170 } finally {
171 if (is != null) {
172 try {
173 is.close();
174 } catch (IOException e) {
175 }
176 }
177 }
178 }
179
180 private void reportError(String message, IOException e,
181 ISearchEngineResultCollector collector) {
182 Status status = new Status(IStatus.ERROR, HelpBasePlugin.PLUGIN_ID,
183 IStatus.OK, message, e);
184 collector.error(status);
185 }
186
187 private void load(String baseURL, Reader r,
188 ISearchEngineResultCollector collector, IProgressMonitor monitor) {
189 Document document = null;
190 try {
191 DocumentBuilder parser = DocumentBuilderFactory.newInstance()
192 .newDocumentBuilder();
193 if (monitor.isCanceled())
194 return;
195 monitor.beginTask("", 5); monitor.subTask(HelpBaseResources.InfoCenter_searching);
197 document = parser.parse(new InputSource(r));
198 if (monitor.isCanceled())
199 return;
200
201 Node root = document.getFirstChild();
203 while (root.getNodeType() == Node.COMMENT_NODE) {
204 document.removeChild(root);
205 root = document.getFirstChild();
206 if (monitor.isCanceled())
207 return;
208 }
209 monitor.worked(1);
210 load(baseURL, document, (Element) root, collector,
211 new SubProgressMonitor(monitor, 4));
212 } catch (ParserConfigurationException e) {
213 } catch (IOException e) {
215 } catch (SAXException e) {
217 }
219 }
220
221 private void load(String baseURL, Document doc, Element root,
222 ISearchEngineResultCollector collector, IProgressMonitor monitor) {
223 NodeList topics = root.getElementsByTagName("topic"); ISearchEngineResult[] results = new ISearchEngineResult[topics
225 .getLength()];
226 monitor.subTask(HelpBaseResources.InfoCenter_processing);
227 monitor.beginTask("", results.length); for (int i = 0; i < topics.getLength(); i++) {
229 Element el = (Element) topics.item(i);
230 if (monitor.isCanceled())
231 break;
232 results[i] = new InfoCenterResult(baseURL, el);
233 monitor.worked(1);
234 }
235 collector.accept(results);
236 }
237
238 private URL createURL(String query, Scope scope) {
239 StringBuffer buf = new StringBuffer ();
240 buf.append(scope.url);
241 if (!scope.url.endsWith("/")) buf.append("/search?searchWord="); else
244 buf.append("search?searchWord="); try {
246 buf.append(URLEncoder.encode(query, "UTF-8")); } catch (UnsupportedEncodingException e) {
248 buf.append(query);
249 }
250 buf.append("&locale="); buf.append(Platform.getNL());
252 if (scope.searchSelected && scope.tocs != null) {
253 buf.append("&scopedSearch=true"); for (int i = 0; i < scope.tocs.length; i++) {
255 String toc;
256 try {
257 toc = URLEncoder.encode(scope.tocs[i], "UTF-8"); } catch (UnsupportedEncodingException e) {
259 toc = scope.tocs[i];
260 }
261 buf.append("&scope="); buf.append(toc);
263 }
264 }
265 try {
266 return new URL(buf.toString());
267 } catch (MalformedURLException e) {
268 return null;
269 }
270 }
271 }
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