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src/share/jaf_classes/javax/activation/FileTypeMap.java@9c07ef4934dd (annotated)

src/share/jaf_classes/javax/activation/FileTypeMap.java

Thu, 31 Aug 2017 15:18:52 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:18:52 +0800

changeset 637

9c07ef4934dd

parent 494

2fcd3ddb57a6

parent 0

373ffda63c9a

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package javax.activation;
aoqi@0	27
aoqi@0	28	import java.io.File;
aoqi@0	29	import java.util.Map;
aoqi@0	30	import java.util.WeakHashMap;
aoqi@0	31
aoqi@0	32	/**
aoqi@0	33	* The FileTypeMap is an abstract class that provides a data typing
aoqi@0	34	* interface for files. Implementations of this class will
aoqi@0	35	* implement the getContentType methods which will derive a content
aoqi@0	36	* type from a file name or a File object. FileTypeMaps could use any
aoqi@0	37	* scheme to determine the data type, from examining the file extension
aoqi@0	38	* of a file (like the MimetypesFileTypeMap) to opening the file and
aoqi@0	39	* trying to derive its type from the contents of the file. The
aoqi@0	40	* FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap
aoqi@0	41	* unless changed) to determine the content type of files.
aoqi@0	42	*
aoqi@0	43	* @see javax.activation.FileTypeMap
aoqi@0	44	* @see javax.activation.FileDataSource
aoqi@0	45	* @see javax.activation.MimetypesFileTypeMap
aoqi@0	46	*
aoqi@0	47	* @since 1.6
aoqi@0	48	*/
aoqi@0	49
aoqi@0	50	public abstract class FileTypeMap {
aoqi@0	51
aoqi@0	52	private static FileTypeMap defaultMap = null;
aoqi@0	53	private static Map<ClassLoader,FileTypeMap> map =
aoqi@0	54	new WeakHashMap<ClassLoader,FileTypeMap>();
aoqi@0	55
aoqi@0	56	/**
aoqi@0	57	* The default constructor.
aoqi@0	58	*/
aoqi@0	59	public FileTypeMap() {
aoqi@0	60	super();
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	/**
aoqi@0	64	* Return the type of the file object. This method should
aoqi@0	65	* always return a valid MIME type.
aoqi@0	66	*
aoqi@0	67	* @param file A file to be typed.
aoqi@0	68	* @return The content type.
aoqi@0	69	*/
aoqi@0	70	abstract public String getContentType(File file);
aoqi@0	71
aoqi@0	72	/**
aoqi@0	73	* Return the type of the file passed in. This method should
aoqi@0	74	* always return a valid MIME type.
aoqi@0	75	*
aoqi@0	76	* @param filename the pathname of the file.
aoqi@0	77	* @return The content type.
aoqi@0	78	*/
aoqi@0	79	abstract public String getContentType(String filename);
aoqi@0	80
aoqi@0	81	/**
aoqi@0	82	* Sets the default FileTypeMap for the system. This instance
aoqi@0	83	* will be returned to callers of getDefaultFileTypeMap.
aoqi@0	84	*
aoqi@0	85	* @param fileTypeMap The FileTypeMap.
aoqi@0	86	* @exception SecurityException if the caller doesn't have permission
aoqi@0	87	* to change the default
aoqi@0	88	*/
aoqi@0	89	public static synchronized void setDefaultFileTypeMap(FileTypeMap fileTypeMap) {
aoqi@0	90	SecurityManager security = System.getSecurityManager();
aoqi@0	91	if (security != null) {
aoqi@0	92	try {
aoqi@0	93	// if it's ok with the SecurityManager, it's ok with me...
aoqi@0	94	security.checkSetFactory();
aoqi@0	95	} catch (SecurityException ex) {
aoqi@0	96	// otherwise, we also allow it if this code and the
aoqi@0	97	// factory come from the same (non-system) class loader (e.g.,
aoqi@0	98	// the JAF classes were loaded with the applet classes).
aoqi@0	99	if (FileTypeMap.class.getClassLoader() == null ||
aoqi@0	100	FileTypeMap.class.getClassLoader() !=
aoqi@0	101	fileTypeMap.getClass().getClassLoader())
aoqi@0	102	throw ex;
aoqi@0	103	}
aoqi@0	104	}
aoqi@0	105	// remove any per-thread-context-class-loader FileTypeMap
aoqi@0	106	map.remove(SecuritySupport.getContextClassLoader());
aoqi@0	107	defaultMap = fileTypeMap;
aoqi@0	108	}
aoqi@0	109
aoqi@0	110	/**
aoqi@0	111	* Return the default FileTypeMap for the system.
aoqi@0	112	* If setDefaultFileTypeMap was called, return
aoqi@0	113	* that instance, otherwise return an instance of
aoqi@0	114	* <code>MimetypesFileTypeMap</code>.
aoqi@0	115	*
aoqi@0	116	* @return The default FileTypeMap
aoqi@0	117	* @see javax.activation.FileTypeMap#setDefaultFileTypeMap
aoqi@0	118	*/
aoqi@0	119	public static synchronized FileTypeMap getDefaultFileTypeMap() {
aoqi@0	120	if (defaultMap != null)
aoqi@0	121	return defaultMap;
aoqi@0	122
aoqi@0	123	// fetch per-thread-context-class-loader default
aoqi@0	124	ClassLoader tccl = SecuritySupport.getContextClassLoader();
aoqi@0	125	FileTypeMap def = map.get(tccl);
aoqi@0	126	if (def == null) {
aoqi@0	127	def = new MimetypesFileTypeMap();
aoqi@0	128	map.put(tccl, def);
aoqi@0	129	}
aoqi@0	130	return def;
aoqi@0	131	}
aoqi@0	132	}