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	/*
	* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.sun.imageio.plugins.gif;

	/*
	* The source for this class was copied verbatim from the source for
	* package com.sun.imageio.plugins.gif.GIFImageMetadata and then modified
	* to make the class read-write capable.
	*/

	import javax.imageio.ImageTypeSpecifier;
	import javax.imageio.metadata.IIOInvalidTreeException;
	import javax.imageio.metadata.IIOMetadata;
	import javax.imageio.metadata.IIOMetadataNode;
	import javax.imageio.metadata.IIOMetadataFormat;
	import javax.imageio.metadata.IIOMetadataFormatImpl;
	import org.w3c.dom.Node;

	class GIFWritableStreamMetadata extends GIFStreamMetadata {

	// package scope
	static final String
	NATIVE_FORMAT_NAME = "javax_imageio_gif_stream_1.0";

	public GIFWritableStreamMetadata() {
	super(true,
	NATIVE_FORMAT_NAME,
	"com.sun.imageio.plugins.gif.GIFStreamMetadataFormat", // XXX J2SE
	null, null);

	// initialize metadata fields by default values
	reset();
	}

	public boolean isReadOnly() {
	return false;
	}

	public void mergeTree(String formatName, Node root)
	throws IIOInvalidTreeException {
	if (formatName.equals(nativeMetadataFormatName)) {
	if (root == null) {
	throw new IllegalArgumentException("root == null!");
	}
	mergeNativeTree(root);
	} else if (formatName.equals
	(IIOMetadataFormatImpl.standardMetadataFormatName)) {
	if (root == null) {
	throw new IllegalArgumentException("root == null!");
	}
	mergeStandardTree(root);
	} else {
	throw new IllegalArgumentException("Not a recognized format!");
	}
	}

	public void reset() {
	version = null;

	logicalScreenWidth = UNDEFINED_INTEGER_VALUE;
	logicalScreenHeight = UNDEFINED_INTEGER_VALUE;
	colorResolution = UNDEFINED_INTEGER_VALUE;
	pixelAspectRatio = 0;

	backgroundColorIndex = 0;
	sortFlag = false;
	globalColorTable = null;
	}

	protected void mergeNativeTree(Node root) throws IIOInvalidTreeException {
	Node node = root;
	if (!node.getNodeName().equals(nativeMetadataFormatName)) {
	fatal(node, "Root must be " + nativeMetadataFormatName);
	}

	node = node.getFirstChild();
	while (node != null) {
	String name = node.getNodeName();

	if (name.equals("Version")) {
	version = getStringAttribute(node, "value", null,
	true, versionStrings);
	} else if (name.equals("LogicalScreenDescriptor")) {
	/* NB: At the moment we use empty strings to support undefined
	* integer values in tree representation.
	* We need to add better support for undefined/default values
	* later.
	*/
	logicalScreenWidth = getIntAttribute(node,
	"logicalScreenWidth",
	UNDEFINED_INTEGER_VALUE,
	true,
	true, 1, 65535);

	logicalScreenHeight = getIntAttribute(node,
	"logicalScreenHeight",
	UNDEFINED_INTEGER_VALUE,
	true,
	true, 1, 65535);

	colorResolution = getIntAttribute(node,
	"colorResolution",
	UNDEFINED_INTEGER_VALUE,
	true,
	true, 1, 8);

	pixelAspectRatio = getIntAttribute(node,
	"pixelAspectRatio",
	0, true,
	true, 0, 255);
	} else if (name.equals("GlobalColorTable")) {
	int sizeOfGlobalColorTable =
	getIntAttribute(node, "sizeOfGlobalColorTable",
	true, 2, 256);
	if (sizeOfGlobalColorTable != 2 &&
	sizeOfGlobalColorTable != 4 &&
	sizeOfGlobalColorTable != 8 &&
	sizeOfGlobalColorTable != 16 &&
	sizeOfGlobalColorTable != 32 &&
	sizeOfGlobalColorTable != 64 &&
	sizeOfGlobalColorTable != 128 &&
	sizeOfGlobalColorTable != 256) {
	fatal(node,
	"Bad value for GlobalColorTable attribute sizeOfGlobalColorTable!");
	}

	backgroundColorIndex = getIntAttribute(node,
	"backgroundColorIndex",
	0, true,
	true, 0, 255);

	sortFlag = getBooleanAttribute(node, "sortFlag", false, true);

	globalColorTable = getColorTable(node, "ColorTableEntry",
	true, sizeOfGlobalColorTable);
	} else {
	fatal(node, "Unknown child of root node!");
	}

	node = node.getNextSibling();
	}
	}

	protected void mergeStandardTree(Node root)
	throws IIOInvalidTreeException {
	Node node = root;
	if (!node.getNodeName()
	.equals(IIOMetadataFormatImpl.standardMetadataFormatName)) {
	fatal(node, "Root must be " +
	IIOMetadataFormatImpl.standardMetadataFormatName);
	}

	node = node.getFirstChild();
	while (node != null) {
	String name = node.getNodeName();

	if (name.equals("Chroma")) {
	Node childNode = node.getFirstChild();
	while(childNode != null) {
	String childName = childNode.getNodeName();
	if (childName.equals("Palette")) {
	globalColorTable = getColorTable(childNode,
	"PaletteEntry",
	false, -1);

	} else if (childName.equals("BackgroundIndex")) {
	backgroundColorIndex = getIntAttribute(childNode,
	"value",
	-1, true,
	true, 0, 255);
	}
	childNode = childNode.getNextSibling();
	}
	} else if (name.equals("Data")) {
	Node childNode = node.getFirstChild();
	while(childNode != null) {
	String childName = childNode.getNodeName();
	if (childName.equals("BitsPerSample")) {
	colorResolution = getIntAttribute(childNode,
	"value",
	-1, true,
	true, 1, 8);
	break;
	}
	childNode = childNode.getNextSibling();
	}
	} else if (name.equals("Dimension")) {
	Node childNode = node.getFirstChild();
	while(childNode != null) {
	String childName = childNode.getNodeName();
	if (childName.equals("PixelAspectRatio")) {
	float aspectRatio = getFloatAttribute(childNode,
	"value");
	if (aspectRatio == 1.0F) {
	pixelAspectRatio = 0;
	} else {
	int ratio = (int)(aspectRatio*64.0F - 15.0F);
	pixelAspectRatio =
	Math.max(Math.min(ratio, 255), 0);
	}
	} else if (childName.equals("HorizontalScreenSize")) {
	logicalScreenWidth = getIntAttribute(childNode,
	"value",
	-1, true,
	true, 1, 65535);
	} else if (childName.equals("VerticalScreenSize")) {
	logicalScreenHeight = getIntAttribute(childNode,
	"value",
	-1, true,
	true, 1, 65535);
	}
	childNode = childNode.getNextSibling();
	}
	} else if (name.equals("Document")) {
	Node childNode = node.getFirstChild();
	while(childNode != null) {
	String childName = childNode.getNodeName();
	if (childName.equals("FormatVersion")) {
	String formatVersion =
	getStringAttribute(childNode, "value", null,
	true, null);
	for (int i = 0; i < versionStrings.length; i++) {
	if (formatVersion.equals(versionStrings[i])) {
	version = formatVersion;
	break;
	}
	}
	break;
	}
	childNode = childNode.getNextSibling();
	}
	}

	node = node.getNextSibling();
	}
	}

	public void setFromTree(String formatName, Node root)
	throws IIOInvalidTreeException
	{
	reset();
	mergeTree(formatName, root);
	}
	}

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