Examples of org.vfny.geoserver.wms.GetMapProducerFactorySpi

org.vfny.geoserver.wms.GetMapProducerFactorySpi

Constructs a live GetMapProducer.

An instance of this interface should exist for all map producers which want to take advantage of the dynamic plugin system. In addition to implementing this interface GetMap producers should have a services file:

org.vfny.geoserver.responses.wms.GetMapProducerFactorySpi

The file should contain a single line which gives the full name of the implementing class.

example:
e.g. org.vfny.geoserver.wms.GIFLegendGraphicProducerSpi

The factories are never called directly by client code, instead the GeoTools' FactoryFinder class is used.

The following example shows how a user might obtain GetMapProducer capable of generating a map image in GIF format and send the generated legend to a file:

 WMSConfig config = getServletContext().getAttribute(WMSConfig.CONFIG_KEY); GetMapProducerSpi gmpf = null; Iterator it = FactoryFinder.factories(GeMapProducerFactorySpi.class); while (it.hasNext()) { GeMapProducerFactorySpi tmpGmpf = (GeMapProducerFactorySpi) it.next(); if (tmpGmpf.canProduce("image/gif")) { gmpf = tmpGmpf; break; } }  ... GetMapProducer producer = gmpf.createMapProducer("image/gif"); WMSMapContext ctx = ... producer.produceMap(ctx); OutputStream out = new FileOutputStream("/map.gif"); producer.writeTo(out);

@author Gabriel Roldan, Axios Engineering @version $Id$

     */
    static GetMapProducer getDelegate(String outputFormat, WMSConfig config)
        throws WmsException {
        LOGGER.finer("request format is " + outputFormat);


        GetMapProducerFactorySpi mpf = null;
        Iterator mpfi = FactoryFinder.factories(GetMapProducerFactorySpi.class);


        while (mpfi.hasNext()) {
            mpf = (GetMapProducerFactorySpi) mpfi.next();


            if (mpf.canProduce(outputFormat)) {
                break;
            }


            mpf = null;
        }


        if (mpf == null) {
            throw new WmsException("There is no support for creating maps in "
                + outputFormat + " format", "InvalidFormat");
        }


        
        GetMapProducer producer = mpf.createMapProducer(outputFormat,config);


        return producer;
    }

     *
     * @return a Set&lt;String&gt; with the supported mime types.
     */
    public static Set getMapFormats() {
        Set mapFormats = new HashSet();
        GetMapProducerFactorySpi mpf;
        Iterator mpfi = FactoryFinder.factories(GetMapProducerFactorySpi.class);


        while (mpfi.hasNext()) {
            mpf = (GetMapProducerFactorySpi) mpfi.next();
            mapFormats.addAll(mpf.getSupportedFormats());
        }


        return mapFormats;
    }

Examples of org.vfny.geoserver.wms.GetMapProducerFactorySpi

Related Classes of org.vfny.geoserver.wms.GetMapProducerFactorySpi