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1
15 package org.apache.hivemind.impl;
16
17 import java.io.BufferedInputStream  ;
18 import java.io.IOException ;
19 import java.io.InputStream ;
20 import java.net.URL ;
21 import java.util.ArrayList ;
22 import java.util.Collections ;
23 import java.util.HashMap ;
24 import java.util.Iterator ;
25 import java.util.List ;
26 import java.util.Locale ;
27 import java.util.Map ;
28 import java.util.Properties ;
29
30 import org.apache.hivemind.ApplicationRuntimeException;
31 import org.apache.hivemind.Resource;
32 import org.apache.hivemind.internal.MessageFinder;
33 import org.apache.hivemind.util.Defense;
34 import org.apache.hivemind.util.IOUtils;
35 import org.apache.hivemind.util.LocalizedNameGenerator;
36
37
41 public class MessageFinderImpl implements MessageFinder
42 {
43 private static final String EXTENSION = ".properties";
44
45 private static class Localization
46 {
47 private Locale _locale;
48
49 private Resource _resource;
50
51 Localization(Locale locale, Resource resource)
52 {
53 _locale = locale;
54 _resource = resource;
55 }
56
57 public Locale getLocale()
58 {
59 return _locale;
60 }
61
62 public Resource getResource()
63 {
64 return _resource;
65 }
66
67 }
68
69 private Resource _baseResource;
70
71 private String _baseName;
72
73 private Map _propertiesMap = new HashMap ();
74
75 private Properties _emptyProperties = new Properties ();
76
77 public MessageFinderImpl(Resource baseResource)
78 {
79 Defense.notNull(baseResource, "baseResource");
80
81 _baseResource = baseResource;
82
83
86 String name = _baseResource.getName();
87 int dotx = name.lastIndexOf('.');
88 if (dotx < 1) {
89 _baseName = name;
90 } else {
91 _baseName = name.substring(0, dotx);
92 }
93 }
94
95 public String getMessage(String key, Locale locale)
96 {
97 return findProperties(locale).getProperty(key);
98 }
99
100 private synchronized Properties findProperties(Locale locale)
101 {
102 Properties result = (Properties ) _propertiesMap.get(locale);
103
104
107 if (result == null)
108 result = buildProperties(locale);
109
110 return result;
111 }
112
113 private Properties buildProperties(Locale locale)
114 {
115 Properties result = _emptyProperties;
116
117 List localizations = findLocalizations(locale);
118
119 Iterator i = localizations.iterator();
120 while (i.hasNext())
121 {
122 Localization l = (Localization) i.next();
123
124 result = readProperties(l.getLocale(), l.getResource(), result);
125 }
126
127 return result;
128 }
129
130
135
136 private Properties readProperties(Locale locale, Resource propertiesResource, Properties parent)
137 {
138 Properties result = (Properties ) _propertiesMap.get(locale);
139
140 if (result != null)
141 return result;
142
143 URL url = propertiesResource.getResourceURL();
144
145 if (url == null)
146 result = parent;
147 else
148 result = readPropertiesFile(url, parent);
149
150 _propertiesMap.put(locale, result);
151
152 return result;
153 }
154
155 private Properties readPropertiesFile(URL url, Properties parent)
156 {
157 InputStream stream = null;
158
159 Properties result = new Properties (parent);
160
161 try
162 {
163 stream = new BufferedInputStream (url.openStream());
164
165 result.load(stream);
166
167 stream.close();
168
169 stream = null;
170 }
171 catch (IOException ex)
172 {
173 throw new ApplicationRuntimeException(ImplMessages.unableToReadMessages(url), ex);
174
175 }
176 finally
177 {
178 IOUtils.close(stream);
179 }
180
181 return result;
182 }
183
184
188
189 private List findLocalizations(Locale locale)
190 {
191 List result = new ArrayList ();
192
193 LocalizedNameGenerator g = new LocalizedNameGenerator(_baseName, locale, EXTENSION);
194
195 while (g.more())
196 {
197 String name = g.next();
198
199 Localization l = new Localization(g.getCurrentLocale(), _baseResource
200 .getRelativeResource(name));
201
202 result.add(l);
203 }
204
205 Collections.reverse(result);
206
207 return result;
208 }
209 } |
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