| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
| * |
| * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved. |
| * |
| * The contents of this file are subject to the terms of either the GNU |
| * General Public License Version 2 only ("GPL") or the Common Development |
| * and Distribution License("CDDL") (collectively, the "License"). You |
| * may not use this file except in compliance with the License. You can obtain |
| * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html |
| * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific |
| * language governing permissions and limitations under the License. |
| * |
| * When distributing the software, include this License Header Notice in each |
| * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt. |
| * Sun designates this particular file as subject to the "Classpath" exception |
| * as provided by Sun in the GPL Version 2 section of the License file that |
| * accompanied this code. If applicable, add the following below the License |
| * Header, with the fields enclosed by brackets [] replaced by your own |
| * identifying information: "Portions Copyrighted [year] |
| * [name of copyright owner]" |
| * |
| * Contributor(s): |
| * |
| * If you wish your version of this file to be governed by only the CDDL or |
| * only the GPL Version 2, indicate your decision by adding "[Contributor] |
| * elects to include this software in this distribution under the [CDDL or GPL |
| * Version 2] license." If you don't indicate a single choice of license, a |
| * recipient has the option to distribute your version of this file under |
| * either the CDDL, the GPL Version 2 or to extend the choice of license to |
| * its licensees as provided above. However, if you add GPL Version 2 code |
| * and therefore, elected the GPL Version 2 license, then the option applies |
| * only if the new code is made subject to such option by the copyright |
| * holder. |
| */ |
| |
| /* |
| * @(#)FileTypeMap.java 1.9 07/05/14 |
| */ |
| |
| package javax.activation; |
| |
| import java.io.File; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| /** |
| * The FileTypeMap is an abstract class that provides a data typing |
| * interface for files. Implementations of this class will |
| * implement the getContentType methods which will derive a content |
| * type from a file name or a File object. FileTypeMaps could use any |
| * scheme to determine the data type, from examining the file extension |
| * of a file (like the MimetypesFileTypeMap) to opening the file and |
| * trying to derive its type from the contents of the file. The |
| * FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap |
| * unless changed) to determine the content type of files. |
| * |
| * @see javax.activation.FileTypeMap |
| * @see javax.activation.FileDataSource |
| * @see javax.activation.MimetypesFileTypeMap |
| */ |
| |
| public abstract class FileTypeMap { |
| |
| private static FileTypeMap defaultMap = null; |
| private static Map<ClassLoader,FileTypeMap> map = |
| new WeakHashMap<ClassLoader,FileTypeMap>(); |
| |
| /** |
| * The default constructor. |
| */ |
| public FileTypeMap() { |
| super(); |
| } |
| |
| /** |
| * Return the type of the file object. This method should |
| * always return a valid MIME type. |
| * |
| * @param file A file to be typed. |
| * @return The content type. |
| */ |
| abstract public String getContentType(File file); |
| |
| /** |
| * Return the type of the file passed in. This method should |
| * always return a valid MIME type. |
| * |
| * @param filename the pathname of the file. |
| * @return The content type. |
| */ |
| abstract public String getContentType(String filename); |
| |
| /** |
| * Sets the default FileTypeMap for the system. This instance |
| * will be returned to callers of getDefaultFileTypeMap. |
| * |
| * @param map The FileTypeMap. |
| * @exception SecurityException if the caller doesn't have permission |
| * to change the default |
| */ |
| public static synchronized void setDefaultFileTypeMap(FileTypeMap map) { |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| try { |
| // if it's ok with the SecurityManager, it's ok with me... |
| security.checkSetFactory(); |
| } catch (SecurityException ex) { |
| // otherwise, we also allow it if this code and the |
| // factory come from the same (non-system) class loader (e.g., |
| // the JAF classes were loaded with the applet classes). |
| if (FileTypeMap.class.getClassLoader() == null || |
| FileTypeMap.class.getClassLoader() != |
| map.getClass().getClassLoader()) |
| throw ex; |
| } |
| } |
| // remove any per-thread-context-class-loader FileTypeMap |
| map.remove(SecuritySupport.getContextClassLoader()); |
| defaultMap = map; |
| } |
| |
| /** |
| * Return the default FileTypeMap for the system. |
| * If setDefaultFileTypeMap was called, return |
| * that instance, otherwise return an instance of |
| * <code>MimetypesFileTypeMap</code>. |
| * |
| * @return The default FileTypeMap |
| * @see javax.activation.FileTypeMap#setDefaultFileTypeMap |
| */ |
| public static synchronized FileTypeMap getDefaultFileTypeMap() { |
| if (defaultMap != null) |
| return defaultMap; |
| |
| // fetch per-thread-context-class-loader default |
| ClassLoader tccl = SecuritySupport.getContextClassLoader(); |
| FileTypeMap def = map.get(tccl); |
| if (def == null) { |
| def = new MimetypesFileTypeMap(); |
| map.put(tccl, def); |
| } |
| return def; |
| } |
| } |