1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/jaf_classes/javax/activation/FileTypeMap.java Tue Mar 06 16:09:35 2012 -0800
1.3 @@ -0,0 +1,118 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2005, 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 +
1.33 +/**
1.34 + * The FileTypeMap is an abstract class that provides a data typing
1.35 + * interface for files. Implementations of this class will
1.36 + * implement the getContentType methods which will derive a content
1.37 + * type from a file name or a File object. FileTypeMaps could use any
1.38 + * scheme to determine the data type, from examining the file extension
1.39 + * of a file (like the MimetypesFileTypeMap) to opening the file and
1.40 + * trying to derive its type from the contents of the file. The
1.41 + * FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap
1.42 + * unless changed) to determine the content type of files.
1.43 + *
1.44 + * @see javax.activation.FileTypeMap
1.45 + * @see javax.activation.FileDataSource
1.46 + * @see javax.activation.MimetypesFileTypeMap
1.47 + *
1.48 + * @since 1.6
1.49 + */
1.50 +
1.51 +public abstract class FileTypeMap {
1.52 +
1.53 + private static FileTypeMap defaultMap = null;
1.54 +
1.55 + /**
1.56 + * The default constructor.
1.57 + */
1.58 + public FileTypeMap() {
1.59 + super();
1.60 + }
1.61 +
1.62 + /**
1.63 + * Return the type of the file object. This method should
1.64 + * always return a valid MIME type.
1.65 + *
1.66 + * @param file A file to be typed.
1.67 + * @return The content type.
1.68 + */
1.69 + abstract public String getContentType(File file);
1.70 +
1.71 + /**
1.72 + * Return the type of the file passed in. This method should
1.73 + * always return a valid MIME type.
1.74 + *
1.75 + * @param filename the pathname of the file.
1.76 + * @return The content type.
1.77 + */
1.78 + abstract public String getContentType(String filename);
1.79 +
1.80 + /**
1.81 + * Sets the default FileTypeMap for the system. This instance
1.82 + * will be returned to callers of getDefaultFileTypeMap.
1.83 + *
1.84 + * @param map The FileTypeMap.
1.85 + * @exception SecurityException if the caller doesn't have permission
1.86 + * to change the default
1.87 + */
1.88 + public static void setDefaultFileTypeMap(FileTypeMap map) {
1.89 + SecurityManager security = System.getSecurityManager();
1.90 + if (security != null) {
1.91 + try {
1.92 + // if it's ok with the SecurityManager, it's ok with me...
1.93 + security.checkSetFactory();
1.94 + } catch (SecurityException ex) {
1.95 + // otherwise, we also allow it if this code and the
1.96 + // factory come from the same class loader (e.g.,
1.97 + // the JAF classes were loaded with the applet classes).
1.98 + if (FileTypeMap.class.getClassLoader() !=
1.99 + map.getClass().getClassLoader())
1.100 + throw ex;
1.101 + }
1.102 + }
1.103 + defaultMap = map;
1.104 + }
1.105 +
1.106 + /**
1.107 + * Return the default FileTypeMap for the system.
1.108 + * If setDefaultFileTypeMap was called, return
1.109 + * that instance, otherwise return an instance of
1.110 + * <code>MimetypesFileTypeMap</code>.
1.111 + *
1.112 + * @return The default FileTypeMap
1.113 + * @see javax.activation.FileTypeMap#setDefaultFileTypeMap
1.114 + */
1.115 + public static FileTypeMap getDefaultFileTypeMap() {
1.116 + // XXX - probably should be synchronized
1.117 + if (defaultMap == null)
1.118 + defaultMap = new MimetypesFileTypeMap();
1.119 + return defaultMap;
1.120 + }
1.121 +}
