001 /**
002 *
003 * Copyright 2005 The Apache Software Foundation
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.geronimo.kernel.classloader;
018
019 import java.io.File;
020 import java.io.IOException;
021 import java.io.FileNotFoundException;
022 import java.net.MalformedURLException;
023 import java.net.URL;
024 import java.net.URLConnection;
025 import java.net.URLStreamHandler;
026 import java.util.jar.JarEntry;
027 import java.util.jar.JarFile;
028
029 /**
030 * @version $Rev: 430581 $ $Date: 2006-08-10 16:16:47 -0700 (Thu, 10 Aug 2006) $
031 */
032 public class JarFileUrlStreamHandler extends URLStreamHandler {
033 public static URL createUrl(JarFile jarFile, JarEntry jarEntry) throws MalformedURLException {
034 return createUrl(jarFile, jarEntry, new File(jarFile.getName()).toURL());
035 }
036
037 public static URL createUrl(JarFile jarFile, JarEntry jarEntry, URL codeSource) throws MalformedURLException {
038 JarFileUrlStreamHandler handler = new JarFileUrlStreamHandler(jarFile, jarEntry);
039 URL url = new URL("jar", "", -1, codeSource + "!/" + jarEntry.getName(), handler);
040 handler.setExpectedUrl(url);
041 return url;
042 }
043
044 private URL expectedUrl;
045 private final JarFile jarFile;
046 private final JarEntry jarEntry;
047
048 public JarFileUrlStreamHandler(JarFile jarFile, JarEntry jarEntry) {
049 if (jarFile == null) throw new NullPointerException("jarFile is null");
050 if (jarEntry == null) throw new NullPointerException("jarEntry is null");
051
052 this.jarFile = jarFile;
053 this.jarEntry = jarEntry;
054 }
055
056 public void setExpectedUrl(URL expectedUrl) {
057 if (expectedUrl == null) throw new NullPointerException("expectedUrl is null");
058 this.expectedUrl = expectedUrl;
059 }
060
061 public URLConnection openConnection(URL url) throws IOException {
062 if (expectedUrl == null) throw new IllegalStateException("expectedUrl was not set");
063
064 // the caller copied the URL reusing a stream handler from a previous call
065 if (!expectedUrl.equals(url)) {
066 // the new url is supposed to be within our context, so it must have a jar protocol
067 if (!url.getProtocol().equals("jar")) {
068 throw new IllegalArgumentException("Unsupported protocol " + url.getProtocol());
069 }
070
071 // split the path at "!/" into the file part and entry part
072 String path = url.getPath();
073 String[] chunks = path.split("!/", 2);
074
075 // if we only got only one chunk, it didn't contain the required "!/" delimiter
076 if (chunks.length == 1) {
077 throw new MalformedURLException("Url does not contain a '!' character: " + url);
078 }
079
080 String file = chunks[0];
081 String entryPath = chunks[1];
082
083 // this handler only supports jars on the local file system
084 if (!file.startsWith("file:")) {
085 // let the system handler deal with this
086 return new URL(url.toExternalForm()).openConnection();
087 }
088 file = file.substring("file:".length());
089
090 // again the new url is supposed to be within our context so it must reference the same jar file
091 if (!jarFile.getName().equals(file)) {
092 // let the system handler deal with this
093 return new URL(url.toExternalForm()).openConnection();
094 }
095
096 // get the entry
097 JarEntry newEntry = jarFile.getJarEntry(entryPath);
098 if (newEntry == null) {
099 throw new FileNotFoundException("Entry not found: " + url);
100 }
101 return new JarFileUrlConnection(url, jarFile, newEntry);
102 }
103
104 return new JarFileUrlConnection(url, jarFile, jarEntry);
105 }
106 }