| /* gnu.classpath.tools.FileSystemClassLoader |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.classpath.tools; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.StreamTokenizer; |
| import java.io.StringReader; |
| |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.ArrayList; |
| import java.util.StringTokenizer; |
| |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.jar.Manifest; |
| import java.util.jar.Attributes; |
| |
| /** |
| * A <code>ClassLoader</code> implementation which looks for classes |
| * on the local filesystem given a standard search path. |
| */ |
| public class FileSystemClassLoader extends ClassLoader { |
| |
| private File[] pathComponents; |
| |
| /** |
| * Initialize the class loader with a normal path string. The path |
| * string should contain path components separated by {@link |
| * File.pathSeparator}. Each path component should either denote a |
| * directory or a .jar or .zip file. |
| */ |
| public FileSystemClassLoader(String path) |
| { |
| List components = new ArrayList(); |
| for (StringTokenizer st = new StringTokenizer(path, File.pathSeparator); st.hasMoreTokens(); ) { |
| File pathComponent = new File(st.nextToken()); |
| components.add(pathComponent); |
| if (pathComponent.exists() && !pathComponent.isDirectory()) { |
| List subComponents = tryGetJarFileClassPathComponents(pathComponent); |
| if (null != subComponents) { |
| components.addAll(subComponents); |
| } |
| } |
| } |
| File[] componentArray = new File[components.size()]; |
| this.pathComponents = (File[])components.toArray(componentArray); |
| } |
| |
| /** |
| * Initialize the class loader with an array of path |
| * components. Each path component should either denote a |
| * directory or a .jar or .zip file. |
| */ |
| public FileSystemClassLoader(File[] pathComponents) |
| { |
| this.pathComponents = pathComponents; |
| for (int i = 0; i < pathComponents.length; ++i) { |
| if (!pathComponents[i].exists()) { |
| System.err.println("WARNING: Path component '" + pathComponents[i] + "' not found."); |
| } |
| } |
| } |
| |
| public Class loadClass(String name) |
| throws ClassNotFoundException { |
| |
| return super.loadClass(name); |
| } |
| |
| public Class findClass(String name) |
| throws ClassNotFoundException { |
| |
| byte[] b = loadClassData(name); |
| return defineClass(name, b, 0, b.length); |
| } |
| |
| public URL findResource(String name) |
| { |
| StreamInfo streamInfo = getResourceStream(name); |
| if (null == streamInfo) { |
| return super.findResource(name); |
| } |
| else { |
| try { |
| return streamInfo.getURL(); |
| } |
| catch (MalformedURLException e) { |
| System.err.println("WARNING: In FileSystemClassLoader: could not derive URL from file or jar entry: " + e.toString()); |
| return null; |
| } |
| } |
| } |
| |
| private byte[] readFromStream(InputStream in, long size) |
| throws IOException |
| { |
| byte[] result = new byte[(int)size]; |
| int nread = 0; |
| int offset = 0; |
| while (offset < size && (nread = in.read(result, offset, (int)(size - offset))) >= 0) { |
| offset += nread; |
| } |
| in.close(); |
| return result; |
| } |
| |
| private byte[] readFromStream(StreamInfo streamInfo) |
| throws IOException |
| { |
| InputStream in = streamInfo.openStream(); |
| long size = streamInfo.getSize(); |
| |
| byte[] result = new byte[(int)size]; |
| int nread = 0; |
| int offset = 0; |
| while (offset < size && (nread = in.read(result, offset, (int)(size - offset))) >= 0) { |
| offset += nread; |
| } |
| in.close(); |
| return result; |
| } |
| |
| private static interface StreamInfo |
| { |
| public InputStream openStream() |
| throws IOException; |
| public long getSize(); |
| public URL getURL() |
| throws MalformedURLException; |
| } |
| |
| private static class FileStreamInfo |
| implements StreamInfo |
| { |
| File file; |
| |
| FileStreamInfo(File file) |
| { |
| this.file = file; |
| } |
| |
| public InputStream openStream() |
| throws IOException |
| { |
| return new FileInputStream(file); |
| } |
| |
| public long getSize() |
| { |
| return file.length(); |
| } |
| |
| public URL getURL() |
| throws MalformedURLException |
| { |
| return file.toURL(); |
| } |
| } |
| |
| private static class JarStreamInfo |
| implements StreamInfo |
| { |
| private File file; |
| private JarFile jarFile; |
| private JarEntry jarEntry; |
| |
| JarStreamInfo(File file, JarFile jarFile, JarEntry jarEntry) |
| { |
| this.file = file; |
| this.jarFile = jarFile; |
| this.jarEntry = jarEntry; |
| } |
| |
| public InputStream openStream() |
| throws IOException |
| { |
| return jarFile.getInputStream(jarEntry); |
| } |
| |
| public long getSize() |
| { |
| return jarEntry.getSize(); |
| } |
| |
| public URL getURL() |
| throws MalformedURLException |
| { |
| String urlString = "jar:" + file.toURL() + "!/" + jarEntry.getName(); |
| return new URL(urlString); |
| } |
| } |
| |
| private StreamInfo getResourceStream(String path) |
| { |
| for (int i = 0; i < pathComponents.length; ++i) { |
| try { |
| File parent = pathComponents[i]; |
| if (parent.isDirectory()) { |
| File file = new File(parent, path); |
| if (file.exists()) { |
| return new FileStreamInfo(file); |
| } |
| } |
| else { |
| JarFile jarFile = new JarFile(parent, false, JarFile.OPEN_READ); |
| JarEntry jarEntry = jarFile.getJarEntry(path); |
| if (null != jarEntry) { |
| return new JarStreamInfo(parent, jarFile, jarEntry); |
| } |
| } |
| } |
| catch (IOException ignore) { |
| } |
| } |
| return null; |
| } |
| |
| private byte[] loadClassData(String className) |
| throws ClassNotFoundException |
| { |
| String classFileName = className.replace('.', File.separatorChar) + ".class"; |
| StreamInfo streamInfo = getResourceStream(classFileName); |
| |
| try { |
| if (null != streamInfo) { |
| return readFromStream(streamInfo); |
| } |
| } |
| catch (IOException ignore) { |
| } |
| |
| throw new ClassNotFoundException(className); |
| } |
| |
| private static List tryGetJarFileClassPathComponents(File file) |
| { |
| try { |
| JarFile jarFile = new JarFile(file, false, JarFile.OPEN_READ); |
| Manifest manifest = jarFile.getManifest(); |
| if (null != manifest) { |
| Attributes mainAttributes = manifest.getMainAttributes(); |
| if (null != mainAttributes) { |
| String classPath = mainAttributes.getValue(Attributes.Name.CLASS_PATH); |
| if (null != classPath) { |
| List result = new LinkedList(); |
| StreamTokenizer tokenizer = new StreamTokenizer(new StringReader(classPath)); |
| tokenizer.resetSyntax(); |
| tokenizer.wordChars(0, Integer.MAX_VALUE); |
| tokenizer.whitespaceChars(9, 9); // tab |
| tokenizer.whitespaceChars(10, 10); // lf |
| tokenizer.whitespaceChars(13, 13); // cr |
| tokenizer.whitespaceChars(32, 32); // space |
| tokenizer.quoteChar('"'); |
| int token; |
| while ((token = tokenizer.nextToken()) != StreamTokenizer.TT_EOF) { |
| if (StreamTokenizer.TT_WORD == token) { |
| result.add(new File(file.getParentFile(), tokenizer.sval)); |
| } |
| } |
| return result; |
| } |
| } |
| } |
| } |
| catch (IOException ignore) { |
| } |
| return null; |
| } |
| } |