1 /* 2 * Copyright (c) 1997, 2006, 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 HashMap<String, JarFile> fileCache = new HashMap<String, JarFile>(); 47 48 /* the file to url cache */ 49 private static HashMap<JarFile, URL> urlCache = new HashMap<JarFile, URL>(); 50 51 URLConnection getConnection(JarFile jarFile) throws IOException { 52 URL u = urlCache.get(jarFile); 53 if (u != null) 54 return u.openConnection(); 55 56 return null; 57 } 58 59 public JarFile get(URL url) throws IOException { 60 return get(url, true); 61 } 62 63 JarFile get(URL url, boolean useCaches) throws IOException { 64 65 JarFile result = null; 66 JarFile local_result = null; 67 68 if (useCaches) { 69 synchronized (this) { 70 result = getCachedJarFile(url); 71 } 72 if (result == null) { 73 local_result = URLJarFile.getJarFile(url, this); 74 synchronized (this) { 75 result = getCachedJarFile(url); 76 if (result == null) { 77 fileCache.put(URLUtil.urlNoFragString(url), local_result); 78 urlCache.put(local_result, url); 79 result = local_result; 80 } else { 81 if (local_result != null) { 82 local_result.close(); 83 } 84 } 85 } 86 } 87 } else { 88 result = URLJarFile.getJarFile(url, this); 89 } 90 if (result == null) 91 throw new FileNotFoundException(url.toString()); 92 93 return result; 94 } 95 96 /** 97 * Callback method of the URLJarFileCloseController to 98 * indicate that the JarFile is close. This way we can 99 * remove the JarFile from the cache 100 */ 101 public void close(JarFile jarFile) { 102 URL urlRemoved = urlCache.remove(jarFile); 103 if( urlRemoved != null) { 104 fileCache.remove(URLUtil.urlNoFragString(urlRemoved)); 105 } 106 } 107 108 109 private JarFile getCachedJarFile(URL url) { 110 JarFile result = fileCache.get(URLUtil.urlNoFragString(url)); 111 112 /* if the JAR file is cached, the permission will always be there */ 113 if (result != null) { 114 Permission perm = getPermission(result); 115 if (perm != null) { 116 SecurityManager sm = System.getSecurityManager(); 117 if (sm != null) { 118 try { 119 sm.checkPermission(perm); 120 } catch (SecurityException se) { 121 // fallback to checkRead/checkConnect for pre 1.2 122 // security managers 123 if ((perm instanceof java.io.FilePermission) && 124 perm.getActions().indexOf("read") != -1) { 125 sm.checkRead(perm.getName()); 126 } else if ((perm instanceof 127 java.net.SocketPermission) && 128 perm.getActions().indexOf("connect") != -1) { 129 sm.checkConnect(url.getHost(), url.getPort()); 130 } else { 131 throw se; 132 } 133 } 134 } 135 } 136 } 137 return result; 138 } 139 140 private Permission getPermission(JarFile jarFile) { 141 try { 142 URLConnection uc = getConnection(jarFile); 143 if (uc != null) 144 return uc.getPermission(); 145 } catch (IOException ioe) { 146 // gulp 147 } 148 149 return null; 150 } 151 } --- EOF ---