/*

 * Copyright (c) 2005, 2015, 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

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package com.sun.imageio.plugins.tiff;

import java.nio.ByteOrder;

import javax.imageio.metadata.IIOMetadata;

import javax.imageio.metadata.IIOMetadataNode;

import javax.imageio.metadata.IIOInvalidTreeException;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

public class TIFFStreamMetadata extends IIOMetadata {

    // package scope

    static final String NATIVE_METADATA_FORMAT_NAME =

        "javax_imageio_tiff_stream_1.0";

    static final String NATIVE_METADATA_FORMAT_CLASS_NAME =

        "javax.imageio.plugins.tiff.TIFFStreamMetadataFormat";

    private static final String bigEndianString =

        ByteOrder.BIG_ENDIAN.toString();

    private static final String littleEndianString =

        ByteOrder.LITTLE_ENDIAN.toString();

    public ByteOrder byteOrder = ByteOrder.BIG_ENDIAN;

    public TIFFStreamMetadata() {

        super(false,

              NATIVE_METADATA_FORMAT_NAME,

              NATIVE_METADATA_FORMAT_CLASS_NAME,

              null, null);

    }

    public boolean isReadOnly() {

        return false;

    }

    // Shorthand for throwing an IIOInvalidTreeException

    private static void fatal(Node node, String reason)

        throws IIOInvalidTreeException {

        throw new IIOInvalidTreeException(reason, node);

    }

    public Node getAsTree(String formatName) {

        IIOMetadataNode root = new IIOMetadataNode(nativeMetadataFormatName);

        IIOMetadataNode byteOrderNode = new IIOMetadataNode("ByteOrder");

        byteOrderNode.setAttribute("value", byteOrder.toString());

        root.appendChild(byteOrderNode);

        return root;

    }

//     public void setFromTree(String formatName, Node root) {

//     }

    private void mergeNativeTree(Node root) throws IIOInvalidTreeException {

        Node node = root;

        if (!node.getNodeName().equals(nativeMetadataFormatName)) {

            fatal(node, "Root must be " + nativeMetadataFormatName);

        }

        node = node.getFirstChild();

        if (node == null || !node.getNodeName().equals("ByteOrder")) {

            fatal(node, "Root must have \"ByteOrder\" child");

        }

        NamedNodeMap attrs = node.getAttributes();

        String order = attrs.getNamedItem("value").getNodeValue();

        if (order == null) {

            fatal(node, "ByteOrder node must have a \"value\" attribute");

        }

        if (order.equals(bigEndianString)) {

            this.byteOrder = ByteOrder.BIG_ENDIAN;

        } else if (order.equals(littleEndianString)) {

            this.byteOrder = ByteOrder.LITTLE_ENDIAN;

        } else {

            fatal(node, "Incorrect value for ByteOrder \"value\" attribute");

        }

    }

    public void mergeTree(String formatName, Node root)

        throws IIOInvalidTreeException {

        if (formatName.equals(nativeMetadataFormatName)) {

            if (root == null) {

                throw new NullPointerException("root == null!");

            }

            mergeNativeTree(root);

        } else {

            throw new IllegalArgumentException("Not a recognized format!");

        }

    }

    public void reset() {

        this.byteOrder = ByteOrder.BIG_ENDIAN;

    }

}