1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/jaf_classes/javax/activation/FileTypeMap.java Wed Apr 27 01:27:09 2016 +0800
1.3 @@ -0,0 +1,132 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package javax.activation;
1.30 +
1.31 +import java.io.File;
1.32 +import java.util.Map;
1.33 +import java.util.WeakHashMap;
1.34 +
1.35 +/**
1.36 + * The FileTypeMap is an abstract class that provides a data typing
1.37 + * interface for files. Implementations of this class will
1.38 + * implement the getContentType methods which will derive a content
1.39 + * type from a file name or a File object. FileTypeMaps could use any
1.40 + * scheme to determine the data type, from examining the file extension
1.41 + * of a file (like the MimetypesFileTypeMap) to opening the file and
1.42 + * trying to derive its type from the contents of the file. The
1.43 + * FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap
1.44 + * unless changed) to determine the content type of files.
1.45 + *
1.46 + * @see javax.activation.FileTypeMap
1.47 + * @see javax.activation.FileDataSource
1.48 + * @see javax.activation.MimetypesFileTypeMap
1.49 + *
1.50 + * @since 1.6
1.51 + */
1.52 +
1.53 +public abstract class FileTypeMap {
1.54 +
1.55 + private static FileTypeMap defaultMap = null;
1.56 + private static Map<ClassLoader,FileTypeMap> map =
1.57 + new WeakHashMap<ClassLoader,FileTypeMap>();
1.58 +
1.59 + /**
1.60 + * The default constructor.
1.61 + */
1.62 + public FileTypeMap() {
1.63 + super();
1.64 + }
1.65 +
1.66 + /**
1.67 + * Return the type of the file object. This method should
1.68 + * always return a valid MIME type.
1.69 + *
1.70 + * @param file A file to be typed.
1.71 + * @return The content type.
1.72 + */
1.73 + abstract public String getContentType(File file);
1.74 +
1.75 + /**
1.76 + * Return the type of the file passed in. This method should
1.77 + * always return a valid MIME type.
1.78 + *
1.79 + * @param filename the pathname of the file.
1.80 + * @return The content type.
1.81 + */
1.82 + abstract public String getContentType(String filename);
1.83 +
1.84 + /**
1.85 + * Sets the default FileTypeMap for the system. This instance
1.86 + * will be returned to callers of getDefaultFileTypeMap.
1.87 + *
1.88 + * @param fileTypeMap The FileTypeMap.
1.89 + * @exception SecurityException if the caller doesn't have permission
1.90 + * to change the default
1.91 + */
1.92 + public static synchronized void setDefaultFileTypeMap(FileTypeMap fileTypeMap) {
1.93 + SecurityManager security = System.getSecurityManager();
1.94 + if (security != null) {
1.95 + try {
1.96 + // if it's ok with the SecurityManager, it's ok with me...
1.97 + security.checkSetFactory();
1.98 + } catch (SecurityException ex) {
1.99 + // otherwise, we also allow it if this code and the
1.100 + // factory come from the same (non-system) class loader (e.g.,
1.101 + // the JAF classes were loaded with the applet classes).
1.102 + if (FileTypeMap.class.getClassLoader() == null ||
1.103 + FileTypeMap.class.getClassLoader() !=
1.104 + fileTypeMap.getClass().getClassLoader())
1.105 + throw ex;
1.106 + }
1.107 + }
1.108 + // remove any per-thread-context-class-loader FileTypeMap
1.109 + map.remove(SecuritySupport.getContextClassLoader());
1.110 + defaultMap = fileTypeMap;
1.111 + }
1.112 +
1.113 + /**
1.114 + * Return the default FileTypeMap for the system.
1.115 + * If setDefaultFileTypeMap was called, return
1.116 + * that instance, otherwise return an instance of
1.117 + * <code>MimetypesFileTypeMap</code>.
1.118 + *
1.119 + * @return The default FileTypeMap
1.120 + * @see javax.activation.FileTypeMap#setDefaultFileTypeMap
1.121 + */
1.122 + public static synchronized FileTypeMap getDefaultFileTypeMap() {
1.123 + if (defaultMap != null)
1.124 + return defaultMap;
1.125 +
1.126 + // fetch per-thread-context-class-loader default
1.127 + ClassLoader tccl = SecuritySupport.getContextClassLoader();
1.128 + FileTypeMap def = map.get(tccl);
1.129 + if (def == null) {
1.130 + def = new MimetypesFileTypeMap();
1.131 + map.put(tccl, def);
1.132 + }
1.133 + return def;
1.134 + }
1.135 +}
