| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.net.www.protocol.jar; |
| |
| import java.io.IOException; |
| import java.io.FileNotFoundException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.util.HashMap; |
| import java.util.jar.JarFile; |
| import java.security.Permission; |
| import sun.net.util.URLUtil; |
| |
| /* A factory for cached JAR file. This class is used to both retrieve |
| * and cache Jar files. |
| * |
| * @author Benjamin Renaud |
| * @since JDK1.2 |
| */ |
| class JarFileFactory implements URLJarFile.URLJarFileCloseController { |
| |
| /* the url to file cache */ |
| private static final HashMap<String, JarFile> fileCache = new HashMap<>(); |
| |
| /* the file to url cache */ |
| private static final HashMap<JarFile, URL> urlCache = new HashMap<>(); |
| |
| private static final JarFileFactory instance = new JarFileFactory(); |
| |
| private JarFileFactory() { } |
| |
| public static JarFileFactory getInstance() { |
| return instance; |
| } |
| |
| URLConnection getConnection(JarFile jarFile) throws IOException { |
| URL u; |
| synchronized (instance) { |
| u = urlCache.get(jarFile); |
| } |
| if (u != null) |
| return u.openConnection(); |
| |
| return null; |
| } |
| |
| public JarFile get(URL url) throws IOException { |
| return get(url, true); |
| } |
| |
| JarFile get(URL url, boolean useCaches) throws IOException { |
| if (url.getProtocol().equalsIgnoreCase("file")) { |
| // Deal with UNC pathnames specially. See 4180841 |
| |
| String host = url.getHost(); |
| if (host != null && !host.equals("") && |
| !host.equalsIgnoreCase("localhost")) { |
| |
| url = new URL("file", "", "//" + host + url.getPath()); |
| } |
| } |
| |
| JarFile result; |
| JarFile local_result; |
| |
| if (useCaches) { |
| synchronized (instance) { |
| result = getCachedJarFile(url); |
| } |
| if (result == null) { |
| local_result = URLJarFile.getJarFile(url, this); |
| synchronized (instance) { |
| result = getCachedJarFile(url); |
| if (result == null) { |
| fileCache.put(URLUtil.urlNoFragString(url), local_result); |
| urlCache.put(local_result, url); |
| result = local_result; |
| } else { |
| if (local_result != null) { |
| local_result.close(); |
| } |
| } |
| } |
| } |
| } else { |
| result = URLJarFile.getJarFile(url, this); |
| } |
| if (result == null) |
| throw new FileNotFoundException(url.toString()); |
| |
| return result; |
| } |
| |
| /** |
| * Callback method of the URLJarFileCloseController to |
| * indicate that the JarFile is close. This way we can |
| * remove the JarFile from the cache |
| */ |
| public void close(JarFile jarFile) { |
| synchronized (instance) { |
| URL urlRemoved = urlCache.remove(jarFile); |
| if (urlRemoved != null) |
| fileCache.remove(URLUtil.urlNoFragString(urlRemoved)); |
| } |
| } |
| |
| private JarFile getCachedJarFile(URL url) { |
| assert Thread.holdsLock(instance); |
| JarFile result = fileCache.get(URLUtil.urlNoFragString(url)); |
| |
| /* if the JAR file is cached, the permission will always be there */ |
| if (result != null) { |
| Permission perm = getPermission(result); |
| if (perm != null) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| try { |
| sm.checkPermission(perm); |
| } catch (SecurityException se) { |
| // fallback to checkRead/checkConnect for pre 1.2 |
| // security managers |
| if ((perm instanceof java.io.FilePermission) && |
| perm.getActions().indexOf("read") != -1) { |
| sm.checkRead(perm.getName()); |
| } else if ((perm instanceof |
| java.net.SocketPermission) && |
| perm.getActions().indexOf("connect") != -1) { |
| sm.checkConnect(url.getHost(), url.getPort()); |
| } else { |
| throw se; |
| } |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| private Permission getPermission(JarFile jarFile) { |
| try { |
| URLConnection uc = getConnection(jarFile); |
| if (uc != null) |
| return uc.getPermission(); |
| } catch (IOException ioe) { |
| // gulp |
| } |
| |
| return null; |
| } |
| } |