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8  * particular file as subject to the "Classpath" exception as provided
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12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
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24  */
25 package javax.imageio.plugins.tiff;
26 
27 import java.util.ArrayList;
28 import java.util.List;
29 
30 /**
31  * A class containing the TIFF tags used to reference the Exif and GPS IFDs.
32  * This tag set should be added to the root tag set by means of the
33  * {@link TIFFImageReadParam#addAllowedTagSet(TIFFTagSet)
34  * TIFFImageReadParam.addAllowedTagSet} method if Exif
35  * support is desired.
36  *
37  * @since 9
38  */
39 public final class ExifParentTIFFTagSet extends TIFFTagSet {
40 
41     private static ExifParentTIFFTagSet theInstance = null;
42 
43     // 34665 - Exif IFD Pointer                   (LONG/1)
44     /** Tag pointing to the Exif IFD (type LONG). */
45     public static final int TAG_EXIF_IFD_POINTER = 34665;
46 
47     /** Tag pointing to a GPS info IFD (type LONG). */
48     public static final int TAG_GPS_INFO_IFD_POINTER = 34853;
49 
50     // To be inserted into parent (root) TIFFTagSet
51     static class ExifIFDPointer extends TIFFTag {
52 
ExifIFDPointer()53         public ExifIFDPointer() {
54             super("ExifIFDPointer",
55                   TAG_EXIF_IFD_POINTER,
56                   ExifTIFFTagSet.getInstance());
57         }
58     }
59 
60     // To be inserted into parent (root) TIFFTagSet
61     static class GPSInfoIFDPointer extends TIFFTag {
62 
GPSInfoIFDPointer()63         public GPSInfoIFDPointer() {
64             super("GPSInfoIFDPointer",
65                   TAG_GPS_INFO_IFD_POINTER,
66                   ExifGPSTagSet.getInstance());
67         }
68     }
69 
70     private static List<TIFFTag> tags;
71 
initTags()72     private static void initTags() {
73         tags = new ArrayList<TIFFTag>(1);
74         tags.add(new ExifParentTIFFTagSet.ExifIFDPointer());
75         tags.add(new ExifParentTIFFTagSet.GPSInfoIFDPointer());
76     }
77 
ExifParentTIFFTagSet()78     private ExifParentTIFFTagSet() {
79         super(tags);
80     }
81 
82     /**
83      * Returns a shared instance of an {@code ExifParentTIFFTagSet}.
84      *
85      * @return an {@code ExifParentTIFFTagSet} instance.
86      */
getInstance()87     public synchronized static ExifParentTIFFTagSet getInstance() {
88         if (theInstance == null) {
89             initTags();
90             theInstance = new ExifParentTIFFTagSet();
91             tags = null;
92         }
93         return theInstance;
94     }
95 }
96