author | mkos |
Sun, 15 Dec 2013 23:35:45 +0100 | |
changeset 23959 | f37ffa18553c |
parent 22678 | ac1ea46be942 |
child 25685 | c4d4cbb36e12 |
permissions | -rw-r--r-- |
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/* |
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ac1ea46be942
8029237: Update copyright year to match last edit in jaxws repository for 2012
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parents:
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* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.activation; |
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import java.io.File; |
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import java.util.Map; |
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import java.util.WeakHashMap; |
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/** |
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* The FileTypeMap is an abstract class that provides a data typing |
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* interface for files. Implementations of this class will |
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* implement the getContentType methods which will derive a content |
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* type from a file name or a File object. FileTypeMaps could use any |
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* scheme to determine the data type, from examining the file extension |
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* of a file (like the MimetypesFileTypeMap) to opening the file and |
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* trying to derive its type from the contents of the file. The |
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* FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap |
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* unless changed) to determine the content type of files. |
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* |
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* @see javax.activation.FileTypeMap |
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* @see javax.activation.FileDataSource |
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* @see javax.activation.MimetypesFileTypeMap |
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* |
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* @since 1.6 |
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*/ |
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public abstract class FileTypeMap { |
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private static FileTypeMap defaultMap = null; |
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private static Map<ClassLoader,FileTypeMap> map = |
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new WeakHashMap<ClassLoader,FileTypeMap>(); |
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/** |
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* The default constructor. |
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*/ |
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public FileTypeMap() { |
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super(); |
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} |
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/** |
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* Return the type of the file object. This method should |
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* always return a valid MIME type. |
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* |
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* @param file A file to be typed. |
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* @return The content type. |
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*/ |
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abstract public String getContentType(File file); |
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/** |
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* Return the type of the file passed in. This method should |
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* always return a valid MIME type. |
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* |
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* @param filename the pathname of the file. |
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* @return The content type. |
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*/ |
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abstract public String getContentType(String filename); |
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/** |
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* Sets the default FileTypeMap for the system. This instance |
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* will be returned to callers of getDefaultFileTypeMap. |
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* |
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* @param fileTypeMap The FileTypeMap. |
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* @exception SecurityException if the caller doesn't have permission |
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* to change the default |
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*/ |
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public static synchronized void setDefaultFileTypeMap(FileTypeMap fileTypeMap) { |
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SecurityManager security = System.getSecurityManager(); |
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if (security != null) { |
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try { |
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// if it's ok with the SecurityManager, it's ok with me... |
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security.checkSetFactory(); |
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} catch (SecurityException ex) { |
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// otherwise, we also allow it if this code and the |
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// factory come from the same (non-system) class loader (e.g., |
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// the JAF classes were loaded with the applet classes). |
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if (FileTypeMap.class.getClassLoader() == null || |
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FileTypeMap.class.getClassLoader() != |
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fileTypeMap.getClass().getClassLoader()) |
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throw ex; |
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} |
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} |
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// remove any per-thread-context-class-loader FileTypeMap |
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map.remove(SecuritySupport.getContextClassLoader()); |
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defaultMap = fileTypeMap; |
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} |
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/** |
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* Return the default FileTypeMap for the system. |
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* If setDefaultFileTypeMap was called, return |
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* that instance, otherwise return an instance of |
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* <code>MimetypesFileTypeMap</code>. |
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* |
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* @return The default FileTypeMap |
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* @see javax.activation.FileTypeMap#setDefaultFileTypeMap |
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*/ |
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public static synchronized FileTypeMap getDefaultFileTypeMap() { |
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if (defaultMap != null) |
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return defaultMap; |
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// fetch per-thread-context-class-loader default |
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ClassLoader tccl = SecuritySupport.getContextClassLoader(); |
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FileTypeMap def = map.get(tccl); |
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if (def == null) { |
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def = new MimetypesFileTypeMap(); |
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map.put(tccl, def); |
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} |
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return def; |
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} |
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} |