001/*
002 * $RCSfile: PNMMetadataFormat.java,v $
003 *
004 * 
005 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
006 * 
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions
009 * are met: 
010 * 
011 * - Redistribution of source code must retain the above copyright 
012 *   notice, this  list of conditions and the following disclaimer.
013 * 
014 * - Redistribution in binary form must reproduce the above copyright
015 *   notice, this list of conditions and the following disclaimer in 
016 *   the documentation and/or other materials provided with the
017 *   distribution.
018 * 
019 * Neither the name of Sun Microsystems, Inc. or the names of 
020 * contributors may be used to endorse or promote products derived 
021 * from this software without specific prior written permission.
022 * 
023 * This software is provided "AS IS," without a warranty of any 
024 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
025 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
026 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
028 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
029 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
031 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035 * POSSIBILITY OF SUCH DAMAGES. 
036 * 
037 * You acknowledge that this software is not designed or intended for 
038 * use in the design, construction, operation or maintenance of any 
039 * nuclear facility. 
040 *
041 * $Revision: 1.1 $
042 * $Date: 2005/02/11 05:01:41 $
043 * $State: Exp $
044 */
045package com.github.jaiimageio.impl.plugins.pnm;
046
047import java.util.Hashtable;
048import javax.imageio.metadata.*;
049import javax.imageio.ImageTypeSpecifier;
050
051public class PNMMetadataFormat extends IIOMetadataFormatImpl {
052    /** The table to link the child to its parent.
053     */
054    private static Hashtable parents = new Hashtable();
055
056    static {
057        //children for the root
058        parents.put("FormatName", "com_sun_media_imageio_plugins_pnm_image_1.0");
059        parents.put("Variant", "com_sun_media_imageio_plugins_pnm_image_1.0");
060        parents.put("Width", "com_sun_media_imageio_plugins_pnm_image_1.0");
061        parents.put("Height", "com_sun_media_imageio_plugins_pnm_image_1.0");
062        parents.put("MaximumSample", "com_sun_media_imageio_plugins_pnm_image_1.0");
063        parents.put("Comment", "com_sun_media_imageio_plugins_pnm_image_1.0");
064    }
065
066    private static PNMMetadataFormat instance;
067
068    public static synchronized PNMMetadataFormat getInstance() {
069        if (instance == null)
070            instance = new PNMMetadataFormat();
071        return instance;
072    }
073
074    String resourceBaseName = this.getClass().getName() + "Resources";
075
076    /** Constructs <code>PNMMetadataFormat</code>.  Calls the super
077     *  class constructor.  Sets the resource base name.  Adds the elements
078     *  into this format object based on the XML schema and DTD.
079     */
080    PNMMetadataFormat() {
081        super("com_sun_media_imageio_plugins_pnm_image_1.0", CHILD_POLICY_ALL);
082        setResourceBaseName(resourceBaseName);
083        addElements();
084    }
085
086    /** Adds the elements into this format object based on the XML
087     *  schema and DTD.
088     */
089    private void addElements() {
090        addElement("FormatName",
091                      getParent("FormatName"),
092                      CHILD_POLICY_EMPTY);
093
094        addElement("Variant",
095                      getParent("Variant"),
096                      CHILD_POLICY_EMPTY);
097        addElement("Width",
098                      getParent("Width"),
099                      CHILD_POLICY_EMPTY);
100        addElement("Height",
101                      getParent("Height"),
102                      CHILD_POLICY_EMPTY);
103        addElement("MaximumSample",
104                      getParent("MaximumSample"),
105                      CHILD_POLICY_EMPTY);
106        addElement("Comment",
107                      getParent("Comment"),
108                      CHILD_POLICY_EMPTY);
109    }
110
111    public String getParent(String elementName) {
112        return (String)parents.get(elementName);
113    }
114
115    public boolean canNodeAppear(String elementName,
116                                 ImageTypeSpecifier imageType) {
117        if (getParent(elementName) != null)
118            return true;
119        return false;
120    }
121}