001/*
002 * $RCSfile: EXIFParentTIFFTagSet.java,v $
003 *
004 * 
005 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
006 * 
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions
009 * are met: 
010 * 
011 * - Redistribution of source code must retain the above copyright 
012 *   notice, this  list of conditions and the following disclaimer.
013 * 
014 * - Redistribution in binary form must reproduce the above copyright
015 *   notice, this list of conditions and the following disclaimer in 
016 *   the documentation and/or other materials provided with the
017 *   distribution.
018 * 
019 * Neither the name of Sun Microsystems, Inc. or the names of 
020 * contributors may be used to endorse or promote products derived 
021 * from this software without specific prior written permission.
022 * 
023 * This software is provided "AS IS," without a warranty of any 
024 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
025 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
026 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
028 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
029 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
031 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035 * POSSIBILITY OF SUCH DAMAGES. 
036 * 
037 * You acknowledge that this software is not designed or intended for 
038 * use in the design, construction, operation or maintenance of any 
039 * nuclear facility. 
040 *
041 * $Revision: 1.4 $
042 * $Date: 2006/04/28 01:01:59 $
043 * $State: Exp $
044 */
045package com.github.jaiimageio.plugins.tiff;
046
047import java.util.ArrayList;
048import java.util.List;
049
050/**
051 * A class containing the TIFF tags used to reference the EXIF and GPS IFDs.
052 * This tag set should be added to the root tag set by means of the 
053 * {@link TIFFImageReadParam#addAllowedTagSet(TIFFTagSet)
054 * <code>TIFFImageReadParam.addAllowedTagSet</code>} method if EXIF
055 * support is desired.
056 */
057public class EXIFParentTIFFTagSet extends TIFFTagSet {
058
059    private static EXIFParentTIFFTagSet theInstance = null;
060
061    // 34665 - EXIF IFD Pointer                   (LONG/1)
062    /** Tag pointing to the EXIF IFD (type LONG). */
063    public static final int TAG_EXIF_IFD_POINTER = 34665;
064
065    /** Tag pointing to a GPS info IFD (type LONG). */
066    public static final int TAG_GPS_INFO_IFD_POINTER = 34853;
067
068    // To be inserted into parent (root) TIFFTagSet
069    static class EXIFIFDPointer extends TIFFTag {
070        
071        public EXIFIFDPointer() {
072            super("EXIFIFDPointer",
073                  TAG_EXIF_IFD_POINTER,
074                  1 << TIFFTag.TIFF_LONG,
075                  EXIFTIFFTagSet.getInstance());
076        }
077    }
078
079    // To be inserted into parent (root) TIFFTagSet
080    static class GPSInfoIFDPointer extends TIFFTag {
081        
082        public GPSInfoIFDPointer() {
083            super("GPSInfoIFDPointer",
084                  TAG_GPS_INFO_IFD_POINTER,
085                  1 << TIFFTag.TIFF_LONG,
086                  EXIFGPSTagSet.getInstance());
087        }
088    }
089
090    private static List tags;
091
092    private static void initTags() {
093        tags = new ArrayList(1);
094        tags.add(new EXIFParentTIFFTagSet.EXIFIFDPointer());
095        tags.add(new EXIFParentTIFFTagSet.GPSInfoIFDPointer());
096    }
097
098    private EXIFParentTIFFTagSet() {
099        super(tags);
100    }
101
102    /**
103     * Returns a shared instance of an <code>EXIFParentTIFFTagSet</code>.
104     *
105     * @return an <code>EXIFParentTIFFTagSet</code> instance.
106     */
107    public synchronized static EXIFParentTIFFTagSet getInstance() {
108        if (theInstance == null) {
109            initTags();
110            theInstance = new EXIFParentTIFFTagSet();
111            tags = null;
112        }
113        return theInstance;
114    }
115}