svgmapproducerfactory.java

电子地图服务器,搭建自己的地图服务

/* 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.svg;

import org.vfny.geoserver.config.WMSConfig;
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;


/**
 * DOCUMENT ME!
 *
 * @author Gabriel Roldan, Axios Engineering
 * @version $Id: SvgMapProducerFactory.java 6326 2007-03-15 18:36:40Z jdeolive $
 */
public class SvgMapProducerFactory implements GetMapProducerFactorySpi {
    /**
     * this is just to check the requested mime type starts with this string,
     * since the most common error when performing the HTTP request is not to
     * escape the '+' sign in "image/svg+xml", which is decoded as a space
     * character at server side.
     */
    private static final String PRODUCE_TYPE = "image/svg";

    /** DOCUMENT ME! */
    static final String MIME_TYPE = "image/svg+xml";

    /** DOCUMENT ME! */
    private static final Set SUPPORTED_FORMATS = Collections.singleton(MIME_TYPE);

    /**
     * Creates a new SvgMapProducerFactory object.
     */
    public SvgMapProducerFactory() {
        super();
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public String getName() {
        return "Scalable Vector Graphics (SVG) map producer";
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public Set getSupportedFormats() {
        return SUPPORTED_FORMATS;
    }

    /**
     * By now SVG map producer does not have external dependencied (such as
     * Batik), so just returns <code>true</code>.
     *
     * <p>
     * It is most probable that this situation change in the future, like when
     * adding Styling support.
     * </p>
     *
     * @return <code>true</code>
     */
    public boolean isAvailable() {
        return true;
    }

    /**
     * evaluates if this Map producer can generate the map format specified by
     * <code>mapFormat</code>
     *
     * <p>
     * In this case, true if <code>mapFormat</code> starts with "image/svg", as
     * both <code>"image/svg"</code> and <code>"image/svg+xml"</code> are
     * commonly passed.
     * </p>
     *
     * @param mapFormat the mime type of the output map format requiered
     *
     * @return true if class can produce a map in the passed format.
     */
    public boolean canProduce(String mapFormat) {
        return (mapFormat != null) && mapFormat.startsWith(PRODUCE_TYPE);
    }

    /**
     * Returns an svg renderer based on the current wms configuration.
     *
     * @param mapFormat DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     *
     * @throws IllegalArgumentException DOCUMENT ME!
     */
    public GetMapProducer createMapProducer(String mapFormat, WMS wms)
        throws IllegalArgumentException {
        if (wms != null) {
            if (WMSConfig.SVG_SIMPLE.equals(wms.getSvgRenderer())) {
                return new SVGMapProducer();
            }

            if (WMSConfig.SVG_BATIK.equals(wms.getSvgRenderer())) {
                return new SVGBatikMapProducer(wms);
            }
        }

        //do the default
        return new SVGMapProducer();
    }

    /* (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;
    }
}