Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/jdeps/ClassFileReader.java@a51b7fd0543b
src/share/classes/com/sun/tools/jdeps/ClassFileReader.java
Fri, 18 Jul 2014 10:43:41 -0700
- author
- mchung
- date
- Fri, 18 Jul 2014 10:43:41 -0700
- changeset 2539
- a51b7fd0543b
- parent 2538
- 1e39ae45d8ac
- child 2702
- 9ca8d8713094
- child 3368
- f206126308bc
- permissions
- -rw-r--r--
8050804: (jdeps) Recommend supported API to replace use of JDK internal API
Reviewed-by: dfuchs
1 /*
2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package com.sun.tools.jdeps;
27 import com.sun.tools.classfile.ClassFile;
28 import com.sun.tools.classfile.ConstantPoolException;
29 import com.sun.tools.classfile.Dependencies.ClassFileError;
30 import java.io.*;
31 import java.nio.file.FileVisitResult;
32 import java.nio.file.Files;
33 import java.nio.file.Path;
34 import java.nio.file.SimpleFileVisitor;
35 import java.nio.file.attribute.BasicFileAttributes;
36 import java.util.*;
37 import java.util.jar.JarEntry;
38 import java.util.jar.JarFile;
40 /**
41 * ClassFileReader reads ClassFile(s) of a given path that can be
42 * a .class file, a directory, or a JAR file.
43 */
44 public class ClassFileReader {
45 /**
46 * Returns a ClassFileReader instance of a given path.
47 */
48 public static ClassFileReader newInstance(Path path) throws IOException {
49 if (!Files.exists(path)) {
50 throw new FileNotFoundException(path.toString());
51 }
53 if (Files.isDirectory(path)) {
54 return new DirectoryReader(path);
55 } else if (path.getFileName().toString().endsWith(".jar")) {
56 return new JarFileReader(path);
57 } else {
58 return new ClassFileReader(path);
59 }
60 }
62 /**
63 * Returns a ClassFileReader instance of a given JarFile.
64 */
65 public static ClassFileReader newInstance(Path path, JarFile jf) throws IOException {
66 return new JarFileReader(path, jf);
67 }
69 protected final Path path;
70 protected final String baseFileName;
71 protected final List<String> skippedEntries = new ArrayList<>();
72 protected ClassFileReader(Path path) {
73 this.path = path;
74 this.baseFileName = path.getFileName() != null
75 ? path.getFileName().toString()
76 : path.toString();
77 }
79 public String getFileName() {
80 return baseFileName;
81 }
83 public List<String> skippedEntries() {
84 return skippedEntries;
85 }
87 /**
88 * Returns the ClassFile matching the given binary name
89 * or a fully-qualified class name.
90 */
91 public ClassFile getClassFile(String name) throws IOException {
92 if (name.indexOf('.') > 0) {
93 int i = name.lastIndexOf('.');
94 String pathname = name.replace('.', File.separatorChar) + ".class";
95 if (baseFileName.equals(pathname) ||
96 baseFileName.equals(pathname.substring(0, i) + "$" +
97 pathname.substring(i+1, pathname.length()))) {
98 return readClassFile(path);
99 }
100 } else {
101 if (baseFileName.equals(name.replace('/', File.separatorChar) + ".class")) {
102 return readClassFile(path);
103 }
104 }
105 return null;
106 }
108 public Iterable<ClassFile> getClassFiles() throws IOException {
109 return new Iterable<ClassFile>() {
110 public Iterator<ClassFile> iterator() {
111 return new FileIterator();
112 }
113 };
114 }
116 protected ClassFile readClassFile(Path p) throws IOException {
117 InputStream is = null;
118 try {
119 is = Files.newInputStream(p);
120 return ClassFile.read(is);
121 } catch (ConstantPoolException e) {
122 throw new ClassFileError(e);
123 } finally {
124 if (is != null) {
125 is.close();
126 }
127 }
128 }
130 class FileIterator implements Iterator<ClassFile> {
131 int count;
132 FileIterator() {
133 this.count = 0;
134 }
135 public boolean hasNext() {
136 return count == 0 && baseFileName.endsWith(".class");
137 }
139 public ClassFile next() {
140 if (!hasNext()) {
141 throw new NoSuchElementException();
142 }
143 try {
144 ClassFile cf = readClassFile(path);
145 count++;
146 return cf;
147 } catch (IOException e) {
148 throw new ClassFileError(e);
149 }
150 }
152 public void remove() {
153 throw new UnsupportedOperationException("Not supported yet.");
154 }
155 }
157 public String toString() {
158 return path.toString();
159 }
161 private static class DirectoryReader extends ClassFileReader {
162 DirectoryReader(Path path) throws IOException {
163 super(path);
164 }
166 public ClassFile getClassFile(String name) throws IOException {
167 if (name.indexOf('.') > 0) {
168 int i = name.lastIndexOf('.');
169 String pathname = name.replace('.', File.separatorChar) + ".class";
170 Path p = path.resolve(pathname);
171 if (!Files.exists(p)) {
172 p = path.resolve(pathname.substring(0, i) + "$" +
173 pathname.substring(i+1, pathname.length()));
174 }
175 if (Files.exists(p)) {
176 return readClassFile(p);
177 }
178 } else {
179 Path p = path.resolve(name + ".class");
180 if (Files.exists(p)) {
181 return readClassFile(p);
182 }
183 }
184 return null;
185 }
187 public Iterable<ClassFile> getClassFiles() throws IOException {
188 final Iterator<ClassFile> iter = new DirectoryIterator();
189 return new Iterable<ClassFile>() {
190 public Iterator<ClassFile> iterator() {
191 return iter;
192 }
193 };
194 }
196 private List<Path> walkTree(Path dir) throws IOException {
197 final List<Path> files = new ArrayList<Path>();
198 Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
199 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
200 throws IOException {
201 if (file.getFileName().toString().endsWith(".class")) {
202 files.add(file);
203 }
204 return FileVisitResult.CONTINUE;
205 }
206 });
207 return files;
208 }
210 class DirectoryIterator implements Iterator<ClassFile> {
211 private List<Path> entries;
212 private int index = 0;
213 DirectoryIterator() throws IOException {
214 entries = walkTree(path);
215 index = 0;
216 }
218 public boolean hasNext() {
219 return index != entries.size();
220 }
222 public ClassFile next() {
223 if (!hasNext()) {
224 throw new NoSuchElementException();
225 }
226 Path path = entries.get(index++);
227 try {
228 return readClassFile(path);
229 } catch (IOException e) {
230 throw new ClassFileError(e);
231 }
232 }
234 public void remove() {
235 throw new UnsupportedOperationException("Not supported yet.");
236 }
237 }
238 }
240 static class JarFileReader extends ClassFileReader {
241 private final JarFile jarfile;
242 JarFileReader(Path path) throws IOException {
243 this(path, new JarFile(path.toFile(), false));
244 }
246 JarFileReader(Path path, JarFile jf) throws IOException {
247 super(path);
248 this.jarfile = jf;
249 }
251 public ClassFile getClassFile(String name) throws IOException {
252 if (name.indexOf('.') > 0) {
253 int i = name.lastIndexOf('.');
254 String entryName = name.replace('.', '/') + ".class";
255 JarEntry e = jarfile.getJarEntry(entryName);
256 if (e == null) {
257 e = jarfile.getJarEntry(entryName.substring(0, i) + "$"
258 + entryName.substring(i + 1, entryName.length()));
259 }
260 if (e != null) {
261 return readClassFile(jarfile, e);
262 }
263 } else {
264 JarEntry e = jarfile.getJarEntry(name + ".class");
265 if (e != null) {
266 return readClassFile(jarfile, e);
267 }
268 }
269 return null;
270 }
272 protected ClassFile readClassFile(JarFile jarfile, JarEntry e) throws IOException {
273 InputStream is = null;
274 try {
275 is = jarfile.getInputStream(e);
276 return ClassFile.read(is);
277 } catch (ConstantPoolException ex) {
278 throw new ClassFileError(ex);
279 } finally {
280 if (is != null)
281 is.close();
282 }
283 }
285 public Iterable<ClassFile> getClassFiles() throws IOException {
286 final Iterator<ClassFile> iter = new JarFileIterator(this, jarfile);
287 return new Iterable<ClassFile>() {
288 public Iterator<ClassFile> iterator() {
289 return iter;
290 }
291 };
292 }
293 }
295 class JarFileIterator implements Iterator<ClassFile> {
296 protected final JarFileReader reader;
297 protected Enumeration<JarEntry> entries;
298 protected JarFile jf;
299 protected JarEntry nextEntry;
300 protected ClassFile cf;
301 JarFileIterator(JarFileReader reader) {
302 this(reader, null);
303 }
304 JarFileIterator(JarFileReader reader, JarFile jarfile) {
305 this.reader = reader;
306 setJarFile(jarfile);
307 }
309 void setJarFile(JarFile jarfile) {
310 if (jarfile == null) return;
312 this.jf = jarfile;
313 this.entries = jf.entries();
314 this.nextEntry = nextEntry();
315 }
317 public boolean hasNext() {
318 if (nextEntry != null && cf != null) {
319 return true;
320 }
321 while (nextEntry != null) {
322 try {
323 cf = reader.readClassFile(jf, nextEntry);
324 return true;
325 } catch (ClassFileError | IOException ex) {
326 skippedEntries.add(nextEntry.getName());
327 }
328 nextEntry = nextEntry();
329 }
330 return false;
331 }
333 public ClassFile next() {
334 if (!hasNext()) {
335 throw new NoSuchElementException();
336 }
337 ClassFile classFile = cf;
338 cf = null;
339 nextEntry = nextEntry();
340 return classFile;
341 }
343 protected JarEntry nextEntry() {
344 while (entries.hasMoreElements()) {
345 JarEntry e = entries.nextElement();
346 String name = e.getName();
347 if (name.endsWith(".class")) {
348 return e;
349 }
350 }
351 return null;
352 }
354 public void remove() {
355 throw new UnsupportedOperationException("Not supported yet.");
356 }
357 }
358 }
