jpegmapproducerfactory.java

来自「电子地图服务器,搭建自己的地图服务」· Java 代码 · 共 70 行

/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
 * This code is licensed under the GPL 2.0 license, availible at the root
 * application directory.
 */
package org.vfny.geoserver.wms.responses.map.jpeg;

import org.vfny.geoserver.global.WMS;
import org.vfny.geoserver.wms.GetMapProducer;
import org.vfny.geoserver.wms.GetMapProducerFactorySpi;
import java.util.Collections;
import java.util.Map;
import java.util.Set;


/**
 * Factory for a JPEG writer.
 *
 * @author Simone Giannecchini
 * @since 1.4.x
 */
public final class JPEGMapProducerFactory implements GetMapProducerFactorySpi {
    /** the only MIME type this map producer supports */
    static final String MIME_TYPE = "image/jpeg";

    public boolean canProduce(String mapFormat) {
        return MIME_TYPE.equalsIgnoreCase(mapFormat);
    }

    public GetMapProducer createMapProducer(String mapFormat, WMS wms)
        throws IllegalArgumentException {
        if (!canProduce(mapFormat)) {
            throw new IllegalArgumentException(new StringBuffer(mapFormat).append(
                    " not supported by this map producer").toString());
        }

        return new JPEGMapProducer(MIME_TYPE, wms);
    }

    public JPEGMapProducerFactory() {
        super();
    }

    public String getName() {
        return "Joint Photographic Experts Group";
    }

    public Set getSupportedFormats() {
        return Collections.singleton(MIME_TYPE);
    }

    public boolean isAvailable() {
        try {
            return (Class.forName("com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageWriter") != null)
            || (Class.forName("com.sun.imageio.plugins.jpeg.JPEGImageWriter") != null);
        } catch (ClassNotFoundException e) {
            return false;
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see org.geotools.factory.Factory#getImplementationHints() This just
     *      returns java.util.Collections.EMPTY_MAP
     */
    public Map getImplementationHints() {
        return java.util.Collections.EMPTY_MAP;
    }
}