1. /*

  2.  * @(#)GIFStreamMetadataFormat.java	1.5 03/01/23

  3.  *

  4.  * Copyright 2003 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. 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. }