1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.net.www.protocol.jar; 27 28 import java.io.IOException; 29 import java.io.FileNotFoundException; 30 import java.net.URL; 31 import java.net.URLConnection; 32 import java.util.HashMap; 33 import java.util.jar.JarFile; 34 import java.security.Permission; 35 import sun.net.util.URLUtil; 36 37 /* A factory for cached JAR file. This class is used to both retrieve 38 * and cache Jar files. 39 * 40 * @author Benjamin Renaud 41 * @since JDK1.2 42 */ 43 class JarFileFactory implements URLJarFile.URLJarFileCloseController { 44 45 /* the url to file cache */ 46 private static final HashMap<String, JarFile> fileCache = new HashMap<>(); 47 48 /* the file to url cache */ 49 private static final HashMap<JarFile, URL> urlCache = new HashMap<>(); 50 51 private static final JarFileFactory instance = new JarFileFactory(); 52 JarFileFactory()53 private JarFileFactory() { } 54 getInstance()55 public static JarFileFactory getInstance() { 56 return instance; 57 } 58 getConnection(JarFile jarFile)59 URLConnection getConnection(JarFile jarFile) throws IOException { 60 URL u; 61 synchronized (instance) { 62 u = urlCache.get(jarFile); 63 } 64 if (u != null) 65 return u.openConnection(); 66 67 return null; 68 } 69 get(URL url)70 public JarFile get(URL url) throws IOException { 71 return get(url, true); 72 } 73 get(URL url, boolean useCaches)74 JarFile get(URL url, boolean useCaches) throws IOException { 75 76 JarFile result; 77 JarFile local_result; 78 79 if (useCaches) { 80 synchronized (instance) { 81 result = getCachedJarFile(url); 82 } 83 if (result == null) { 84 local_result = URLJarFile.getJarFile(url, this); 85 synchronized (instance) { 86 result = getCachedJarFile(url); 87 if (result == null) { 88 fileCache.put(URLUtil.urlNoFragString(url), local_result); 89 urlCache.put(local_result, url); 90 result = local_result; 91 } else { 92 if (local_result != null) { 93 local_result.close(); 94 } 95 } 96 } 97 } 98 } else { 99 result = URLJarFile.getJarFile(url, this); 100 } 101 if (result == null) 102 throw new FileNotFoundException(url.toString()); 103 104 return result; 105 } 106 107 /** 108 * Callback method of the URLJarFileCloseController to 109 * indicate that the JarFile is close. This way we can 110 * remove the JarFile from the cache 111 */ close(JarFile jarFile)112 public void close(JarFile jarFile) { 113 synchronized (instance) { 114 URL urlRemoved = urlCache.remove(jarFile); 115 if (urlRemoved != null) 116 fileCache.remove(URLUtil.urlNoFragString(urlRemoved)); 117 } 118 } 119 getCachedJarFile(URL url)120 private JarFile getCachedJarFile(URL url) { 121 assert Thread.holdsLock(instance); 122 JarFile result = fileCache.get(URLUtil.urlNoFragString(url)); 123 124 /* if the JAR file is cached, the permission will always be there */ 125 if (result != null) { 126 Permission perm = getPermission(result); 127 if (perm != null) { 128 SecurityManager sm = System.getSecurityManager(); 129 if (sm != null) { 130 try { 131 sm.checkPermission(perm); 132 } catch (SecurityException se) { 133 // fallback to checkRead/checkConnect for pre 1.2 134 // security managers 135 if ((perm instanceof java.io.FilePermission) && 136 perm.getActions().indexOf("read") != -1) { 137 sm.checkRead(perm.getName()); 138 } else if ((perm instanceof 139 java.net.SocketPermission) && 140 perm.getActions().indexOf("connect") != -1) { 141 sm.checkConnect(url.getHost(), url.getPort()); 142 } else { 143 throw se; 144 } 145 } 146 } 147 } 148 } 149 return result; 150 } 151 getPermission(JarFile jarFile)152 private Permission getPermission(JarFile jarFile) { 153 try { 154 URLConnection uc = getConnection(jarFile); 155 if (uc != null) 156 return uc.getPermission(); 157 } catch (IOException ioe) { 158 // gulp 159 } 160 161 return null; 162 } 163 } 164