API Overview API Index Package Overview Direct link to this page
JDK 1.6
  javax.activation. FileTypeMap View Javadoc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103

/*
 * @(#)FileTypeMap.java	1.9 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package javax.activation;

import java.io.File;

/**
 * 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
 *
 * @since 1.6
 */

public abstract class FileTypeMap {

    private static FileTypeMap defaultMap = null;

    /**
     * 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 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 class loader (e.g.,
		// the JAF classes were loaded with the applet classes).
		if (FileTypeMap.class.getClassLoader() !=
			map.getClass().getClassLoader())
		    throw ex;
	    }
	}
	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 FileTypeMap getDefaultFileTypeMap() {
	// XXX - probably should be synchronized
	if (defaultMap == null)
	    defaultMap = new MimetypesFileTypeMap();
	return defaultMap;
    }
}

Generated By: JavaOnTracks Doclet 0.1.4     ©Thibaut Colar