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- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist;
-
- import java.io.*;
- import java.util.zip.*;
-
- final class ClassPathList {
- ClassPathList next;
- ClassPath path;
-
- ClassPathList(ClassPath p, ClassPathList n) {
- next = n;
- path = p;
- }
- }
-
-
- final class SystemClassPath implements ClassPath {
- Class thisClass;
-
- SystemClassPath() {
- /* The value of thisClass was this.getClass() in early versions:
- *
- * thisClass = this.getClass();
- *
- * However, this made openClassfile() not search all the system
- * class paths if javassist.jar is put in jre/lib/ext/
- * (with JDK1.4).
- */
- thisClass = java.lang.Object.class;
- }
-
- public InputStream openClassfile(String classname) {
- String jarname = "/" + classname.replace('.', '/') + ".class";
- return thisClass.getResourceAsStream(jarname);
- }
-
- public void close() {}
-
- public String toString() {
- return "*system class path*";
- }
- }
-
-
- final class DirClassPath implements ClassPath {
- String directory;
-
- DirClassPath(String dirName) {
- directory = dirName;
- }
-
- public InputStream openClassfile(String classname) {
- try {
- char sep = File.separatorChar;
- String filename = directory + sep
- + classname.replace('.', sep) + ".class";
- return new FileInputStream(filename.toString());
- }
- catch (FileNotFoundException e) {}
- catch (SecurityException e) {}
- return null;
- }
-
- public void close() {}
-
- public String toString() {
- return directory;
- }
- }
-
-
- final class JarClassPath implements ClassPath {
- ZipFile jarfile;
-
- JarClassPath(String pathname) throws NotFoundException {
- try {
- jarfile = new ZipFile(pathname);
- return;
- }
- catch (ZipException e) {}
- catch (IOException e) {}
- throw new NotFoundException(pathname);
- }
-
- public InputStream openClassfile(String classname)
- throws NotFoundException
- {
- try {
- String jarname = classname.replace('.', '/') + ".class";
- ZipEntry ze = jarfile.getEntry(jarname);
- if (ze != null)
- return jarfile.getInputStream(ze);
- else
- return null; // not found
- }
- catch (ZipException e) {}
- catch (IOException e) {}
- throw new NotFoundException("broken jar file?: "
- + jarfile.getName());
- }
-
- public void close() {
- try {
- jarfile.close();
- jarfile = null;
- }
- catch (IOException e) {}
- }
-
- public String toString() {
- return jarfile == null ? "<null>" : jarfile.toString();
- }
- }
-
- final class ClassPoolTail extends ClassPool {
- protected ClassPathList pathList;
- private Class thisClass;
-
- public ClassPoolTail() {
- pathList = null;
- thisClass = getClass();
- }
-
- public String toString() {
- StringBuffer buf = new StringBuffer();
- buf.append("[class path: ");
- ClassPathList list = pathList;
- while (list != null) {
- buf.append(list.path.toString());
- buf.append(File.pathSeparatorChar);
- list = list.next;
- }
-
- buf.append(']');
- return buf.toString();
- }
-
- public byte[] write(String classname)
- throws NotFoundException, IOException
- {
- return readClassfile(classname);
- }
-
- public void write(String classname, DataOutputStream out)
- throws NotFoundException, CannotCompileException, IOException
- {
- byte[] b = write(classname);
- out.write(b, 0, b.length);
- }
-
- public CtClass get(String classname) throws NotFoundException {
- throw new RuntimeException("fatal error");
- }
-
- public CtClass makeClass(String classname) {
- throw new RuntimeException("fatal error");
- }
-
- void checkClassName(String classname)
- throws NotFoundException
- {
- InputStream fin = openClassfile(classname);
- try {
- fin.close();
- }
- catch (IOException e) { /* ignore */ }
- }
-
- public synchronized ClassPath insertClassPath(ClassPath cp) {
- pathList = new ClassPathList(cp, pathList);
- return cp;
- }
-
- public synchronized ClassPath appendClassPath(ClassPath cp) {
- ClassPathList tail = new ClassPathList(cp, null);
- ClassPathList list = pathList;
- if (list == null)
- pathList = tail;
- else {
- while (list.next != null)
- list = list.next;
-
- list.next = tail;
- }
-
- return cp;
- }
-
- public synchronized void removeClassPath(ClassPath cp) {
- ClassPathList list = pathList;
- if (list != null)
- if (list.path == cp)
- pathList = list.next;
- else {
- while (list.next != null)
- if (list.next.path == cp)
- list.next = list.next.next;
- else
- list = list.next;
- }
-
- cp.close();
- }
-
- public ClassPath appendSystemPath() {
- return appendClassPath(new SystemClassPath());
- }
-
- public ClassPath insertClassPath(String pathname)
- throws NotFoundException
- {
- return insertClassPath(makePathObject(pathname));
- }
-
- public ClassPath appendClassPath(String pathname)
- throws NotFoundException
- {
- return appendClassPath(makePathObject(pathname));
- }
-
- private static ClassPath makePathObject(String pathname)
- throws NotFoundException
- {
- int i = pathname.lastIndexOf('.');
- if (i >= 0) {
- String ext = pathname.substring(i).toLowerCase();
- if (ext.equals(".jar") || ext.equals(".zip"))
- return new JarClassPath(pathname);
- }
-
- return new DirClassPath(pathname);
- }
-
- /**
- * Obtains the contents of the class file for the class
- * specified by <code>classname</code>.
- *
- * @param classname a fully-qualified class name
- */
- byte[] readClassfile(String classname)
- throws NotFoundException, IOException
- {
- InputStream fin = openClassfile(classname);
- byte[] b = readStream(fin);
- fin.close();
- return b;
- }
-
- /**
- * Opens the class file for the class specified by
- * <code>classname</code>.
- *
- * @param classname a fully-qualified class name
- */
- public InputStream openClassfile(String classname)
- throws NotFoundException
- {
- ClassPathList list = pathList;
- InputStream ins = null;
- NotFoundException error = null;
- while (list != null) {
- try {
- ins = list.path.openClassfile(classname);
- }
- catch (NotFoundException e) {
- if (error == null)
- error = e;
- }
-
- if (ins == null)
- list = list.next;
- else
- return ins;
- }
-
- if (error != null)
- throw error;
- else
- throw new NotFoundException(classname);
- }
-
- /**
- * Reads an input stream until it reaches the end.
- *
- * @return the contents of that input stream
- */
- public static byte[] readStream(InputStream fin) throws IOException {
- byte[][] bufs = new byte[8][];
- int bufsize = 4096;
-
- for (int i = 0; i < 8; ++i) {
- bufs[i] = new byte[bufsize];
- int size = 0;
- int len = 0;
- do {
- len = fin.read(bufs[i], size, bufsize - size);
- if (len >= 0)
- size += len;
- else {
- byte[] result = new byte[bufsize - 4096 + size];
- int s = 0;
- for (int j = 0; j < i; ++j) {
- System.arraycopy(bufs[j], 0, result, s, s + 4096);
- s = s + s + 4096;
- }
-
- System.arraycopy(bufs[i], 0, result, s, size);
- return result;
- }
- } while (size < bufsize);
- bufsize *= 2;
- }
-
- throw new IOException("too much data");
- }
- }
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