GIFStreamMetadataFormat


1   /*
2    * @(#)GIFStreamMetadataFormat.java 1.7 04/03/23
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package com.sun.imageio.plugins.gif;
9   
10  import java.util.Arrays  ;
11  import javax.imageio.ImageTypeSpecifier  ;
12  import javax.imageio.metadata.IIOMetadataFormat  ;
13  import javax.imageio.metadata.IIOMetadataFormatImpl  ;
14  
15  public class GIFStreamMetadataFormat extends IIOMetadataFormatImpl   {
16  
17      private static IIOMetadataFormat   instance = null;
18  
19      private GIFStreamMetadataFormat() {
20          super(GIFStreamMetadata.nativeMetadataFormatName,
21                CHILD_POLICY_SOME);
22  
23          // root -> Version
24          addElement("Version", GIFStreamMetadata.nativeMetadataFormatName,
25                     CHILD_POLICY_EMPTY);
26          addAttribute("Version", "value", 
27                       DATATYPE_STRING, true, null,
28                       Arrays.asList(GIFStreamMetadata.versionStrings));
29  
30          // root -> LogicalScreenDescriptor
31          addElement("LogicalScreenDescriptor",
32                     GIFStreamMetadata.nativeMetadataFormatName,
33                     CHILD_POLICY_EMPTY);
34          addAttribute("LogicalScreenDescriptor", "logicalScreenWidth",
35                       DATATYPE_INTEGER, true, null,
36                       "1", "65535", true, true);
37          addAttribute("LogicalScreenDescriptor", "logicalScreenHeight",
38                       DATATYPE_INTEGER, true, null,
39                       "1", "65535", true, true);
40          addAttribute("LogicalScreenDescriptor", "colorResolution",
41                       DATATYPE_INTEGER, true, null,
42                       "1", "8", true, true);
43          addAttribute("LogicalScreenDescriptor", "pixelAspectRatio",
44                       DATATYPE_INTEGER, true, null,
45                       "0", "255", true, true);
46  
47          // root -> GlobalColorTable
48          addElement("GlobalColorTable",
49                     GIFStreamMetadata.nativeMetadataFormatName,
50                     2, 256);
51          addAttribute("GlobalColorTable", "sizeOfGlobalColorTable", 
52                       DATATYPE_INTEGER, true, null,
53                       Arrays.asList(GIFStreamMetadata.colorTableSizes));
54          addAttribute("GlobalColorTable", "backgroundColorIndex",
55                       DATATYPE_INTEGER, true, null,
56                       "0", "255", true, true);
57          addBooleanAttribute("GlobalColorTable", "sortFlag",
58                              false, false);
59  
60          // root -> GlobalColorTable -> ColorTableEntry
61          addElement("ColorTableEntry", "GlobalColorTable",
62                     CHILD_POLICY_EMPTY);
63          addAttribute("ColorTableEntry", "index",
64                       DATATYPE_INTEGER, true, null,
65                       "0", "255", true, true);
66          addAttribute("ColorTableEntry", "red",
67                       DATATYPE_INTEGER, true, null,
68                       "0", "255", true, true);
69          addAttribute("ColorTableEntry", "green",
70                       DATATYPE_INTEGER, true, null,
71                       "0", "255", true, true);
72          addAttribute("ColorTableEntry", "blue",
73                       DATATYPE_INTEGER, true, null,
74                       "0", "255", true, true);
75      }
76  
77      public boolean canNodeAppear(String   elementName,
78                                   ImageTypeSpecifier   imageType) {
79          return true;
80      }
81  
82      public static synchronized IIOMetadataFormat   getInstance() {
83          if (instance == null) {
84              instance = new GIFStreamMetadataFormat();
85          }
86          return instance;
87      }
88  }
89
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