1 /* 2 * Copyright (c) 1999, 2011, 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 if (url.getProtocol().equalsIgnoreCase("file")) { 65 // Deal with UNC pathnames specially. See 4180841 66 67 String host = url.getHost(); 68 if (host != null && !host.equals("") && 69 !host.equalsIgnoreCase("localhost")) { 70 71 url = new URL("file", "", "//" + host + url.getPath()); 72 } 73 } 74 75 JarFile result = null; 76 JarFile local_result = null; 77 78 if (useCaches) { 79 synchronized (this) { 80 result = getCachedJarFile(url); 81 } 82 if (result == null) { 83 local_result = URLJarFile.getJarFile(url, this); 84 synchronized (this) { 85 result = getCachedJarFile(url); 86 if (result == null) { 87 fileCache.put(URLUtil.urlNoFragString(url), local_result); 88 urlCache.put(local_result, url); 89 result = local_result; 90 } else { 91 if (local_result != null) { 92 local_result.close(); 93 } 94 } 95 } 96 } 97 } else { 98 result = URLJarFile.getJarFile(url, this); 99 } 100 if (result == null) 101 throw new FileNotFoundException(url.toString()); 102 103 return result; 104 } 105 106 /** 107 * Callback method of the URLJarFileCloseController to 108 * indicate that the JarFile is close. This way we can 109 * remove the JarFile from the cache 110 */ 111 public void close(JarFile jarFile) { 112 URL urlRemoved = urlCache.remove(jarFile); 113 if( urlRemoved != null) { 114 fileCache.remove(URLUtil.urlNoFragString(urlRemoved)); 115 } 116 } 117 118 private JarFile getCachedJarFile(URL url) { 119 JarFile result = fileCache.get(URLUtil.urlNoFragString(url)); 120 121 /* if the JAR file is cached, the permission will always be there */ 122 if (result != null) { 123 Permission perm = getPermission(result); 124 if (perm != null) { 125 SecurityManager sm = System.getSecurityManager(); 126 if (sm != null) { 127 try { 128 sm.checkPermission(perm); 129 } catch (SecurityException se) { 130 // fallback to checkRead/checkConnect for pre 1.2 131 // security managers 132 if ((perm instanceof java.io.FilePermission) && 133 perm.getActions().indexOf("read") != -1) { 134 sm.checkRead(perm.getName()); 135 } else if ((perm instanceof 136 java.net.SocketPermission) && 137 perm.getActions().indexOf("connect") != -1) { 138 sm.checkConnect(url.getHost(), url.getPort()); 139 } else { 140 throw se; 141 } 142 } 143 } 144 } 145 } 146 return result; 147 } 148 149 private Permission getPermission(JarFile jarFile) { 150 try { 151 URLConnection uc = getConnection(jarFile); 152 if (uc != null) 153 return uc.getPermission(); 154 } catch (IOException ioe) { 155 // gulp 156 } 157 158 return null; 159 } 160 }