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comparison: mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/VersionInfo.java

mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/VersionInfo.java

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1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package ch.boye.httpclientandroidlib.util;
29
30 import java.io.IOException;
31 import java.io.InputStream;
32 import java.util.Map;
33 import java.util.Properties;
34 import java.util.ArrayList;
35
36
37 /**
38 * Provides access to version information for HTTP components.
39 * Static methods are used to extract version information from property
40 * files that are automatically packaged with HTTP component release JARs.
41 * <br/>
42 * All available version information is provided in strings, where
43 * the string format is informal and subject to change without notice.
44 * Version information is provided for debugging output and interpretation
45 * by humans, not for automated processing in applications.
46 *
47 * @since 4.0
48 */
49 public class VersionInfo {
50
51 /** A string constant for unavailable information. */
52 public final static String UNAVAILABLE = "UNAVAILABLE";
53
54 /** The filename of the version information files. */
55 public final static String VERSION_PROPERTY_FILE = "version.properties";
56
57 // the property names
58 public final static String PROPERTY_MODULE = "info.module";
59 public final static String PROPERTY_RELEASE = "info.release";
60 public final static String PROPERTY_TIMESTAMP = "info.timestamp";
61
62
63 /** The package that contains the version information. */
64 private final String infoPackage;
65
66 /** The module from the version info. */
67 private final String infoModule;
68
69 /** The release from the version info. */
70 private final String infoRelease;
71
72 /** The timestamp from the version info. */
73 private final String infoTimestamp;
74
75 /** The classloader from which the version info was obtained. */
76 private final String infoClassloader;
77
78
79 /**
80 * Instantiates version information.
81 *
82 * @param pckg the package
83 * @param module the module, or <code>null</code>
84 * @param release the release, or <code>null</code>
85 * @param time the build time, or <code>null</code>
86 * @param clsldr the class loader, or <code>null</code>
87 */
88 protected VersionInfo(String pckg, String module,
89 String release, String time, String clsldr) {
90 if (pckg == null) {
91 throw new IllegalArgumentException
92 ("Package identifier must not be null.");
93 }
94
95 infoPackage = pckg;
96 infoModule = (module != null) ? module : UNAVAILABLE;
97 infoRelease = (release != null) ? release : UNAVAILABLE;
98 infoTimestamp = (time != null) ? time : UNAVAILABLE;
99 infoClassloader = (clsldr != null) ? clsldr : UNAVAILABLE;
100 }
101
102
103 /**
104 * Obtains the package name.
105 * The package name identifies the module or informal unit.
106 *
107 * @return the package name, never <code>null</code>
108 */
109 public final String getPackage() {
110 return infoPackage;
111 }
112
113 /**
114 * Obtains the name of the versioned module or informal unit.
115 * This data is read from the version information for the package.
116 *
117 * @return the module name, never <code>null</code>
118 */
119 public final String getModule() {
120 return infoModule;
121 }
122
123 /**
124 * Obtains the release of the versioned module or informal unit.
125 * This data is read from the version information for the package.
126 *
127 * @return the release version, never <code>null</code>
128 */
129 public final String getRelease() {
130 return infoRelease;
131 }
132
133 /**
134 * Obtains the timestamp of the versioned module or informal unit.
135 * This data is read from the version information for the package.
136 *
137 * @return the timestamp, never <code>null</code>
138 */
139 public final String getTimestamp() {
140 return infoTimestamp;
141 }
142
143 /**
144 * Obtains the classloader used to read the version information.
145 * This is just the <code>toString</code> output of the classloader,
146 * since the version information should not keep a reference to
147 * the classloader itself. That could prevent garbage collection.
148 *
149 * @return the classloader description, never <code>null</code>
150 */
151 public final String getClassloader() {
152 return infoClassloader;
153 }
154
155
156 /**
157 * Provides the version information in human-readable format.
158 *
159 * @return a string holding this version information
160 */
161 public String toString() {
162 StringBuffer sb = new StringBuffer
163 (20 + infoPackage.length() + infoModule.length() +
164 infoRelease.length() + infoTimestamp.length() +
165 infoClassloader.length());
166
167 sb.append("VersionInfo(")
168 .append(infoPackage).append(':').append(infoModule);
169
170 // If version info is missing, a single "UNAVAILABLE" for the module
171 // is sufficient. Everything else just clutters the output.
172 if (!UNAVAILABLE.equals(infoRelease))
173 sb.append(':').append(infoRelease);
174 if (!UNAVAILABLE.equals(infoTimestamp))
175 sb.append(':').append(infoTimestamp);
176
177 sb.append(')');
178
179 if (!UNAVAILABLE.equals(infoClassloader))
180 sb.append('@').append(infoClassloader);
181
182 return sb.toString();
183 }
184
185
186 /**
187 * Loads version information for a list of packages.
188 *
189 * @param pckgs the packages for which to load version info
190 * @param clsldr the classloader to load from, or
191 * <code>null</code> for the thread context classloader
192 *
193 * @return the version information for all packages found,
194 * never <code>null</code>
195 */
196 public final static VersionInfo[] loadVersionInfo(String[] pckgs,
197 ClassLoader clsldr) {
198 if (pckgs == null) {
199 throw new IllegalArgumentException
200 ("Package identifier list must not be null.");
201 }
202
203 ArrayList vil = new ArrayList(pckgs.length);
204 for (int i=0; i<pckgs.length; i++) {
205 VersionInfo vi = loadVersionInfo(pckgs[i], clsldr);
206 if (vi != null)
207 vil.add(vi);
208 }
209
210 return (VersionInfo[]) vil.toArray(new VersionInfo[vil.size()]);
211 }
212
213
214 /**
215 * Loads version information for a package.
216 *
217 * @param pckg the package for which to load version information,
218 * for example "ch.boye.httpclientandroidlib".
219 * The package name should NOT end with a dot.
220 * @param clsldr the classloader to load from, or
221 * <code>null</code> for the thread context classloader
222 *
223 * @return the version information for the argument package, or
224 * <code>null</code> if not available
225 */
226 public final static VersionInfo loadVersionInfo(final String pckg,
227 ClassLoader clsldr) {
228 if (pckg == null) {
229 throw new IllegalArgumentException
230 ("Package identifier must not be null.");
231 }
232
233 if (clsldr == null)
234 clsldr = Thread.currentThread().getContextClassLoader();
235
236 Properties vip = null; // version info properties, if available
237 try {
238 // ch.boye.httpclientandroidlib becomes
239 // org/apache/http/version.properties
240 InputStream is = clsldr.getResourceAsStream
241 (pckg.replace('.', '/') + "/" + VERSION_PROPERTY_FILE);
242 if (is != null) {
243 try {
244 Properties props = new Properties();
245 props.load(is);
246 vip = props;
247 } finally {
248 is.close();
249 }
250 }
251 } catch (IOException ex) {
252 // shamelessly munch this exception
253 }
254
255 VersionInfo result = null;
256 if (vip != null)
257 result = fromMap(pckg, vip, clsldr);
258
259 return result;
260 }
261
262
263 /**
264 * Instantiates version information from properties.
265 *
266 * @param pckg the package for the version information
267 * @param info the map from string keys to string values,
268 * for example {@link java.util.Properties}
269 * @param clsldr the classloader, or <code>null</code>
270 *
271 * @return the version information
272 */
273 protected final static VersionInfo fromMap(String pckg, Map info,
274 ClassLoader clsldr) {
275 if (pckg == null) {
276 throw new IllegalArgumentException
277 ("Package identifier must not be null.");
278 }
279
280 String module = null;
281 String release = null;
282 String timestamp = null;
283
284 if (info != null) {
285 module = (String) info.get(PROPERTY_MODULE);
286 if ((module != null) && (module.length() < 1))
287 module = null;
288
289 release = (String) info.get(PROPERTY_RELEASE);
290 if ((release != null) && ((release.length() < 1) ||
291 (release.equals("${pom.version}"))))
292 release = null;
293
294 timestamp = (String) info.get(PROPERTY_TIMESTAMP);
295 if ((timestamp != null) &&
296 ((timestamp.length() < 1) ||
297 (timestamp.equals("${mvn.timestamp}")))
298 )
299 timestamp = null;
300 } // if info
301
302 String clsldrstr = null;
303 if (clsldr != null)
304 clsldrstr = clsldr.toString();
305
306 return new VersionInfo(pckg, module, release, timestamp, clsldrstr);
307 }
308
309 } // class VersionInfo

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