/*
 * Copyright (c) 2001, 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.jpeg;

import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.plugins.jpeg.JPEGQTable;
import javax.imageio.plugins.jpeg.JPEGHuffmanTable;

import java.util.List;
import java.util.ArrayList;

abstract class JPEGMetadataFormat extends IIOMetadataFormatImpl {
    // 2-byte length reduces max to 65533
    private static final int MAX_JPEG_DATA_SIZE = 65533;

    String resourceBaseName = this.getClass().getName() + "Resources";

    JPEGMetadataFormat(String formatName, int childPolicy) {
        super(formatName, childPolicy);
        setResourceBaseName(resourceBaseName);
    }

    // Format shared between image and stream formats
    void addStreamElements(String parentName) {
        addElement("dqt", parentName, 1, 4);

        addElement("dqtable", "dqt", CHILD_POLICY_EMPTY);

        addAttribute("dqtable",
                     "elementPrecision",
                     DATATYPE_INTEGER,
                     false,
                     "0");
        List tabids = new ArrayList();
        tabids.add("0");
        tabids.add("1");
        tabids.add("2");
        tabids.add("3");
        addAttribute("dqtable",
                     "qtableId",
                     DATATYPE_INTEGER,
                     true,
                     null,
                     tabids);
        addObjectValue("dqtable",
                       JPEGQTable.class,
                       true,
                       null);

        addElement("dht", parentName, 1, 4);
        addElement("dhtable", "dht", CHILD_POLICY_EMPTY);
        List classes = new ArrayList();
        classes.add("0");
        classes.add("1");
        addAttribute("dhtable",
                     "class",
                     DATATYPE_INTEGER,
                     true,
                     null,
                     classes);
        addAttribute("dhtable",
                     "htableId",
                     DATATYPE_INTEGER,
                     true,
                     null,
                     tabids);
        addObjectValue("dhtable",
                       JPEGHuffmanTable.class,
                       true,
                       null);


        addElement("dri", parentName, CHILD_POLICY_EMPTY);
        addAttribute("dri",
                     "interval",
                     DATATYPE_INTEGER,
                     true,
                     null,
                     "0", "65535",
                     true, true);

        addElement("com", parentName, CHILD_POLICY_EMPTY);
        addAttribute("com",
                     "comment",
                     DATATYPE_STRING,
                     false,
                     null);
        addObjectValue("com", byte[].class, 1, MAX_JPEG_DATA_SIZE);

        addElement("unknown", parentName, CHILD_POLICY_EMPTY);
        addAttribute("unknown",
                     "MarkerTag",
                     DATATYPE_INTEGER,
                     true,
                     null,
                     "0", "255",
                     true, true);
        addObjectValue("unknown", byte[].class, 1, MAX_JPEG_DATA_SIZE);
    }

    public boolean canNodeAppear(String elementName,
                                 ImageTypeSpecifier imageType) {
        // Just check if it appears in the format
        if (isInSubtree(elementName, getRootName())){
            return true;
        }
        return false;
    }

    
Returns true if the named element occurs in the
subtree of the format starting with the node named by
subtreeName, including the node
itself.  subtreeName may be any node in
the format.  If it is not, an
IllegalArgumentException is thrown.
/**
     * Returns <code>true</code> if the named element occurs in the
     * subtree of the format starting with the node named by
     * <code>subtreeName</code>, including the node
     * itself.  <code>subtreeName</code> may be any node in
     * the format.  If it is not, an
     * <code>IllegalArgumentException</code> is thrown.
     */
    protected boolean isInSubtree(String elementName,
                                  String subtreeName) {
        if (elementName.equals(subtreeName)) {
            return true;
        }
        String [] children = getChildNames(elementName);
        for (int i=0; i < children.length; i++) {
            if (isInSubtree(elementName, children[i])) {
                return true;
            }
        }
        return false;
    }

}