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/*
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.net.www.protocol.jar;
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import java.io.IOException;
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import java.io.FileNotFoundException;
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import java.net.URL;
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import java.net.URLConnection;
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import java.util.HashMap;
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import java.util.jar.JarFile;
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import java.security.Permission;
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import sun.net.util.URLUtil;
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/* A factory for cached JAR file. This class is used to both retrieve
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* and cache Jar files.
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*
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* @author Benjamin Renaud
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* @since JDK1.2
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*/
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class JarFileFactory implements URLJarFile.URLJarFileCloseController {
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/* the url to file cache */
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private static HashMap<String, JarFile> fileCache = new HashMap<String, JarFile>();
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/* the file to url cache */
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private static HashMap<JarFile, URL> urlCache = new HashMap<JarFile, URL>();
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URLConnection getConnection(JarFile jarFile) throws IOException {
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URL u = urlCache.get(jarFile);
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if (u != null)
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return u.openConnection();
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return null;
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}
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public JarFile get(URL url) throws IOException {
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return get(url, true);
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}
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JarFile get(URL url, boolean useCaches) throws IOException {
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JarFile result = null;
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JarFile local_result = null;
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if (useCaches) {
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synchronized (this) {
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result = getCachedJarFile(url);
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}
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if (result == null) {
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local_result = URLJarFile.getJarFile(url, this);
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synchronized (this) {
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result = getCachedJarFile(url);
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if (result == null) {
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fileCache.put(URLUtil.urlNoFragString(url), local_result);
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urlCache.put(local_result, url);
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result = local_result;
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} else {
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if (local_result != null) {
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local_result.close();
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}
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}
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}
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}
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} else {
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result = URLJarFile.getJarFile(url, this);
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}
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if (result == null)
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throw new FileNotFoundException(url.toString());
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return result;
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}
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/**
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* Callback method of the URLJarFileCloseController to
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* indicate that the JarFile is close. This way we can
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* remove the JarFile from the cache
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*/
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public void close(JarFile jarFile) {
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URL urlRemoved = urlCache.remove(jarFile);
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if( urlRemoved != null) {
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fileCache.remove(URLUtil.urlNoFragString(urlRemoved));
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}
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}
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private JarFile getCachedJarFile(URL url) {
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JarFile result = fileCache.get(URLUtil.urlNoFragString(url));
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/* if the JAR file is cached, the permission will always be there */
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if (result != null) {
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Permission perm = getPermission(result);
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if (perm != null) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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try {
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sm.checkPermission(perm);
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} catch (SecurityException se) {
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// fallback to checkRead/checkConnect for pre 1.2
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// security managers
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if ((perm instanceof java.io.FilePermission) &&
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perm.getActions().indexOf("read") != -1) {
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sm.checkRead(perm.getName());
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} else if ((perm instanceof
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java.net.SocketPermission) &&
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perm.getActions().indexOf("connect") != -1) {
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sm.checkConnect(url.getHost(), url.getPort());
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} else {
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throw se;
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}
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}
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}
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}
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}
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return result;
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}
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private Permission getPermission(JarFile jarFile) {
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try {
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URLConnection uc = getConnection(jarFile);
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if (uc != null)
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return uc.getPermission();
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} catch (IOException ioe) {
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// gulp
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}
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return null;
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}
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}
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