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1
11 package org.eclipse.help.internal.search;
12
13 import java.io.UnsupportedEncodingException  ;
14 import java.net.URLEncoder ;
15
16 import org.eclipse.core.runtime.*;
17 import org.eclipse.help.IHelpResource;
18 import org.eclipse.help.internal.base.HelpBaseResources;
19 import org.eclipse.help.search.ISearchEngine;
20 import org.eclipse.help.search.ISearchEngineResult;
21 import org.eclipse.help.search.ISearchEngineResultCollector;
22 import org.eclipse.help.search.ISearchScope;
23
24
41 public final class WebSearch implements ISearchEngine {
42 private static final char C_START = '{';
43
44 private static final char C_STOP = '}';
45
46 public static class Scope implements ISearchScope {
47 private String urlTemplate;
48
49 public Scope(String urlTemplate) {
50 this.urlTemplate = urlTemplate;
51 }
52
53 public String getURLTemplate() {
54 return urlTemplate;
55 }
56 }
57
58 private static class SearchResult implements ISearchEngineResult {
59 private String query;
60
61 private String urlTemplate;
62
63 public SearchResult(String query, String urlTemplate) {
64 this.query = query;
65 this.urlTemplate = urlTemplate;
66 }
67
68 public String getDescription() {
69 return HelpBaseResources.WebSearch_click;
70 }
71
72 public String getHref() {
73 String href = null;
74 String equery;
75 try {
76 equery = URLEncoder.encode(query, "UTF-8");
78 } catch (UnsupportedEncodingException e) {
79 equery = query;
80 }
81 href = composeURL(equery, urlTemplate);
82 return href;
83 }
84
85 public String getLabel() {
86 return HelpBaseResources.WebSearch_label;
87 }
88
89 public float getScore() {
90 return 1;
91 }
92
93
98 public IHelpResource getCategory() {
99 return null;
100 }
101
102 public boolean getForceExternalWindow() {
103 return true;
104 }
105
106 public String toAbsoluteHref(String href, boolean frames) {
107 return href;
108 }
109 }
110
111
119 public void run(String query, ISearchScope scope,
120 ISearchEngineResultCollector collector, IProgressMonitor monitor)
121 throws CoreException {
122
123 collector
124 .accept(new SearchResult(query, ((Scope) scope).getURLTemplate()));
125 }
126
127 private static String composeURL(String query, String urlTemplate) {
128 StringBuffer result = new StringBuffer ();
129 boolean inSubstitution = false;
130 int varStart = -1;
131 for (int i = 0; i < urlTemplate.length(); i++) {
132 char c = urlTemplate.charAt(i);
133 if (c == C_START && !inSubstitution) {
134 if (i < urlTemplate.length() - 1) {
135 char c2 = urlTemplate.charAt(i + 1);
137 if (c2 == C_START) {
138 result.append(c);
139 i++;
140 continue;
141 }
142 }
143 inSubstitution = true;
144 varStart = i;
145 continue;
146 } else if (c == C_STOP && inSubstitution) {
147 if (i < urlTemplate.length() - 1) {
148 char c2 = urlTemplate.charAt(i + 1);
150 if (c2 == C_STOP) {
151 result.append(c);
152 i++;
153 continue;
154 }
155 }
156 if (varStart != -1) {
157 String key = urlTemplate.substring(varStart + 1, i);
158 String value = getVariable(key, query);
159 result.append(value);
160 }
161 inSubstitution = false;
162 } else if (!inSubstitution) {
163 result.append(c);
164 }
165 }
166 return result.toString();
167 }
168
169 private static String getVariable(String key, String query) {
170 if (key.equals("expression")) return query;
172 return key;
173 }
174 }
175 |
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