1 package org.apache.bcel.util;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache BCEL" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache BCEL", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.util.*;
58 import java.util.zip.*;
59 import java.io.*;
60
61 /***
62 * Responsible for loading (class) files from the CLASSPATH. Inspired by
63 * sun.tools.ClassPath.
64 *
65 * @version $Id: ClassPath.java,v 1.7 2002/11/10 18:30:05 mdahm Exp $
66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67 */
68 public class ClassPath implements Serializable {
69 public static final ClassPath SYSTEM_CLASS_PATH = new ClassPath();
70
71 private PathEntry[] paths;
72 private String class_path;
73
74 /***
75 * Search for classes in given path.
76 */
77 public ClassPath(String class_path) {
78 this.class_path = class_path;
79
80 ArrayList vec = new ArrayList();
81
82 for(StringTokenizer tok=new StringTokenizer(class_path,
83 System.getProperty("path.separator"));
84 tok.hasMoreTokens();)
85 {
86 String path = tok.nextToken();
87
88 if(!path.equals("")) {
89 File file = new File(path);
90
91 try {
92 if(file.exists()) {
93 if(file.isDirectory())
94 vec.add(new Dir(path));
95 else
96 vec.add(new Zip(new ZipFile(file)));
97 }
98 } catch(IOException e) {
99 System.err.println("CLASSPATH component " + file + ": " + e);
100 }
101 }
102 }
103
104 paths = new PathEntry[vec.size()];
105 vec.toArray(paths);
106 }
107
108 /***
109 * Search for classes in CLASSPATH.
110 * @deprecated Use SYSTEM_CLASS_PATH constant
111 */
112 public ClassPath() {
113 this(getClassPath());
114 }
115
116 /*** @return used class path string
117 */
118 public String toString() {
119 return class_path;
120 }
121
122 public int hashCode() {
123 return class_path.hashCode();
124 }
125
126 public boolean equals(Object o) {
127 if(o instanceof ClassPath) {
128 return class_path.equals(((ClassPath)o).class_path);
129 }
130
131 return false;
132 }
133
134 private static final void getPathComponents(String path, ArrayList list) {
135 if(path != null) {
136 StringTokenizer tok = new StringTokenizer(path, File.pathSeparator);
137
138 while(tok.hasMoreTokens()) {
139 String name = tok.nextToken();
140 File file = new File(name);
141
142 if(file.exists())
143 list.add(name);
144 }
145 }
146 }
147
148 /*** Checks for class path components in the following properties:
149 * "java.class.path", "sun.boot.class.path", "java.ext.dirs"
150 *
151 * @return class path as used by default by BCEL
152 */
153 public static final String getClassPath() {
154 String class_path = System.getProperty("java.class.path");
155 String boot_path = System.getProperty("sun.boot.class.path");
156 String ext_path = System.getProperty("java.ext.dirs");
157
158 ArrayList list = new ArrayList();
159
160 getPathComponents(class_path, list);
161 getPathComponents(boot_path, list);
162
163 ArrayList dirs = new ArrayList();
164 getPathComponents(ext_path, dirs);
165
166 for(Iterator e = dirs.iterator(); e.hasNext(); ) {
167 File ext_dir = new File((String)e.next());
168 String[] extensions = ext_dir.list(new FilenameFilter() {
169 public boolean accept(File dir, String name) {
170 name = name.toLowerCase();
171 return name.endsWith(".zip") || name.endsWith(".jar");
172 }
173 });
174
175 if(extensions != null)
176 for(int i=0; i < extensions.length; i++)
177 list.add(ext_path + File.separatorChar + extensions[i]);
178 }
179
180 StringBuffer buf = new StringBuffer();
181
182 for(Iterator e = list.iterator(); e.hasNext(); ) {
183 buf.append((String)e.next());
184
185 if(e.hasNext())
186 buf.append(File.pathSeparatorChar);
187 }
188
189 return buf.toString().intern();
190 }
191
192 /***
193 * @param name fully qualified class name, e.g. java.lang.String
194 * @return input stream for class
195 */
196 public InputStream getInputStream(String name) throws IOException {
197 return getInputStream(name, ".class");
198 }
199
200 /***
201 * Return stream for class or resource on CLASSPATH.
202 *
203 * @param name fully qualified file name, e.g. java/lang/String
204 * @param suffix file name ends with suff, e.g. .java
205 * @return input stream for file on class path
206 */
207 public InputStream getInputStream(String name, String suffix) throws IOException {
208 InputStream is = null;
209
210 try {
211 is = getClass().getClassLoader().getResourceAsStream(name + suffix);
212 } catch(Exception e) { }
213
214 if(is != null)
215 return is;
216
217 return getClassFile(name, suffix).getInputStream();
218 }
219
220 /***
221 * @param name fully qualified file name, e.g. java/lang/String
222 * @param suffix file name ends with suff, e.g. .java
223 * @return class file for the java class
224 */
225 public ClassFile getClassFile(String name, String suffix) throws IOException {
226 for(int i=0; i < paths.length; i++) {
227 ClassFile cf;
228
229 if((cf = paths[i].getClassFile(name, suffix)) != null)
230 return cf;
231 }
232
233 throw new IOException("Couldn't find: " + name + suffix);
234 }
235
236 /***
237 * @param name fully qualified class name, e.g. java.lang.String
238 * @return input stream for class
239 */
240 public ClassFile getClassFile(String name) throws IOException {
241 return getClassFile(name, ".class");
242 }
243
244 /***
245 * @param name fully qualified file name, e.g. java/lang/String
246 * @param suffix file name ends with suffix, e.g. .java
247 * @return byte array for file on class path
248 */
249 public byte[] getBytes(String name, String suffix) throws IOException {
250 InputStream is = getInputStream(name, suffix);
251
252 if(is == null)
253 throw new IOException("Couldn't find: " + name + suffix);
254
255 DataInputStream dis = new DataInputStream(is);
256 byte[] bytes = new byte[is.available()];
257 dis.readFully(bytes);
258 dis.close(); is.close();
259
260 return bytes;
261 }
262
263 /***
264 * @return byte array for class
265 */
266 public byte[] getBytes(String name) throws IOException {
267 return getBytes(name, ".class");
268 }
269
270 /***
271 * @param name name of file to search for, e.g. java/lang/String.java
272 * @return full (canonical) path for file
273 */
274 public String getPath(String name) throws IOException {
275 int index = name.lastIndexOf('.');
276 String suffix = "";
277
278 if(index > 0) {
279 suffix = name.substring(index);
280 name = name.substring(0, index);
281 }
282
283 return getPath(name, suffix);
284 }
285
286 /***
287 * @param name name of file to search for, e.g. java/lang/String
288 * @param suffix file name suffix, e.g. .java
289 * @return full (canonical) path for file, if it exists
290 */
291 public String getPath(String name, String suffix) throws IOException {
292 return getClassFile(name, suffix).getPath();
293 }
294
295 private static abstract class PathEntry implements Serializable {
296 abstract ClassFile getClassFile(String name, String suffix) throws IOException;
297 }
298
299 /*** Contains information about file/ZIP entry of the Java class.
300 */
301 public interface ClassFile {
302 /*** @return input stream for class file.
303 */
304 public abstract InputStream getInputStream() throws IOException;
305
306 /*** @return canonical path to class file.
307 */
308 public abstract String getPath();
309
310 /*** @return base path of found class, i.e. class is contained relative
311 * to that path, which may either denote a directory, or zip file
312 */
313 public abstract String getBase();
314
315 /*** @return modification time of class file.
316 */
317 public abstract long getTime();
318
319 /*** @return size of class file.
320 */
321 public abstract long getSize();
322 }
323
324 private static class Dir extends PathEntry {
325 private String dir;
326
327 Dir(String d) { dir = d; }
328
329 ClassFile getClassFile(String name, String suffix) throws IOException {
330 final File file = new File(dir + File.separatorChar +
331 name.replace('.', File.separatorChar) + suffix);
332
333 return file.exists()? new ClassFile() {
334 public InputStream getInputStream() throws IOException { return new FileInputStream(file); }
335
336 public String getPath() { try {
337 return file.getCanonicalPath();
338 } catch(IOException e) { return null; }
339
340 }
341 public long getTime() { return file.lastModified(); }
342 public long getSize() { return file.length(); }
343 public String getBase() { return dir; }
344
345 } : null;
346 }
347
348 public String toString() { return dir; }
349 }
350
351 private static class Zip extends PathEntry {
352 private ZipFile zip;
353
354 Zip(ZipFile z) { zip = z; }
355
356 ClassFile getClassFile(String name, String suffix) throws IOException {
357 final ZipEntry entry = zip.getEntry(name.replace('.', '/') + suffix);
358
359 return (entry != null)? new ClassFile() {
360 public InputStream getInputStream() throws IOException { return zip.getInputStream(entry); }
361 public String getPath() { return entry.toString(); }
362 public long getTime() { return entry.getTime(); }
363 public long getSize() { return entry.getSize(); }
364 public String getBase() {
365 return zip.getName();
366 }
367 } : null;
368 }
369 }
370 }
371
372
This page was automatically generated by Maven