GrassBinaryImageMetadataFormat.java example

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geotools-old-master
/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2006-2011, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotools.gce.grassraster.metadata;

import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;

import org.geotools.gce.grassraster.JGrassRegion;
import org.geotools.gce.grassraster.core.GrassBinaryRasterReadHandler;

/**
 * Defines the structure of metadata documents describing Grass raster image metadata.
 * 
 * @author Andrea Antonello (www.hydrologis.com)
 * @since 3.0
 * @see GrassBinaryImageMetadata
 * @see GrassBinaryRasterReadHandler
 * @see JGrassRegion
 *
 * @source $URL: http://svn.osgeo.org/geotools/trunk/modules/plugin/grassraster/src/main/java/org/geotools/gce/grassraster/metadata/GrassBinaryImageMetadataFormat.java $
 */
public final class GrassBinaryImageMetadataFormat extends IIOMetadataFormatImpl {

    /**
     * The instance of {@linkplain GrassBinaryImageMetadataFormat}.
     */
    private static IIOMetadataFormat instance = null;

    /**
     * Default constructor.
     */
    protected GrassBinaryImageMetadataFormat() {
        super(GrassBinaryImageMetadata.nativeMetadataFormatName,
                IIOMetadataFormatImpl.CHILD_POLICY_ALL);

        // root -> EnvelopeDescriptor
        addElement(GrassBinaryImageMetadata.REGION_DESCRIPTOR,
                GrassBinaryImageMetadata.nativeMetadataFormatName, CHILD_POLICY_EMPTY);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.NORTH,
                DATATYPE_DOUBLE, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.SOUTH,
                DATATYPE_DOUBLE, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.EAST,
                DATATYPE_DOUBLE, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.WEST,
                DATATYPE_DOUBLE, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.XRES,
                DATATYPE_DOUBLE, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.YRES,
                DATATYPE_DOUBLE, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.NO_DATA,
                DATATYPE_DOUBLE, false, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.NROWS,
                DATATYPE_INTEGER, true, null);
        addAttribute(GrassBinaryImageMetadata.REGION_DESCRIPTOR, GrassBinaryImageMetadata.NCOLS,
                DATATYPE_INTEGER, true, null);

        // root-> ColorrulesDescriptor
        addElement(GrassBinaryImageMetadata.COLOR_RULES_DESCRIPTOR,
                GrassBinaryImageMetadata.nativeMetadataFormatName, CHILD_POLICY_EMPTY);
        addAttribute(GrassBinaryImageMetadata.COLOR_RULES_DESCRIPTOR,
                GrassBinaryImageMetadata.COLOR_RULES_DESCRIPTOR, DATATYPE_STRING, false, null);

        // root-> CategoriesDescriptor
        addElement(GrassBinaryImageMetadata.CATEGORIES_DESCRIPTOR,
                GrassBinaryImageMetadata.nativeMetadataFormatName, CHILD_POLICY_EMPTY);
        addAttribute(GrassBinaryImageMetadata.CATEGORIES_DESCRIPTOR,
                GrassBinaryImageMetadata.CATEGORIES_DESCRIPTOR, DATATYPE_STRING, false, null);

    }

    /**
     * Returns an instance of the {@link GrassBinaryImageMetadataFormat} class.
     * <p>
     * One instance is enough, therefore it is built as a singleton.
     * </p>
     * 
     * @return an instance of the {@link GrassBinaryImageMetadataFormat} class.
     */
    public static synchronized IIOMetadataFormat getInstance() {
        if (instance == null)
            instance = new GrassBinaryImageMetadataFormat();
        return instance;
    }

    public boolean canNodeAppear( String elementName, ImageTypeSpecifier imageType ) {
        return true;
    }
}