Examples of org.vfny.geoserver.wms.GetLegendGraphicProducerSpi

org.vfny.geoserver.wms.GetLegendGraphicProducerSpi
Constructs a live GetLegendGraphicProducer.
An instance of this interface should exist for all legend producers which want to take advantage of the dynamic plugin system. In addition to implementing this interface GetLegendGraphic producers should have a services file:

org.vfny.geoserver.responses.wms.GetLegendGraphicProducerSpi

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

example:
e.g. org.vfny.geoserver.responses.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 GetLegendGraphicProducer capable of generating a legend graphic image in GIF format and send the generated legend to a file:
```
 GetLegendGraphicProducerSpi glf = null; Iterator it = FactoryFinder.factories(GetLegendGraphicProducerSpi.class); while (it.hasNext()) { GetLegendGraphicProducerSpi tmpGlf = (GetLegendGraphicProducerSpi) it.next(); if (tmpGlf.canProduce("image/gif")) { glf = tmpGlf; break; } } GetLegendGraphicProducer producer = glf.createLegendProducer("image/gif"); GetLegendGraphicRequest request = ... producer.produceLegendGraphic(request); OutputStream out = new FileOutputStream("/legend.gif"); producer.writeTo(out); 
```
@author Gabriel Roldan, Axios Engineering @version $Revision: 1.1 $

     *             instantiated
     */
    private GetLegendGraphicProducer getDelegate(String outputFormat)
        throws WmsException {
        Collection producers = GeoServerExtensions.extensions(GetLegendGraphicProducerSpi.class);
        GetLegendGraphicProducerSpi factory;


        for (Iterator iter = producers.iterator(); iter.hasNext();) {
            factory = (GetLegendGraphicProducerSpi) iter.next();


            if (factory.canProduce(outputFormat)) {
                return factory.createLegendProducer(outputFormat);
            }
        }


        throw new WmsException("There is no support for creating legends in " + outputFormat
            + " format", "InvalidFormat");

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     * point and returning the set of available image formats.
     */
    private static Set loadLegendFormats() {
        Collection producers = GeoServerExtensions.extensions(GetLegendGraphicProducerSpi.class);
        Set formats = new HashSet();
        GetLegendGraphicProducerSpi producer;


        for (Iterator iter = producers.iterator(); iter.hasNext();) {
            producer = (GetLegendGraphicProducerSpi) iter.next();
            formats.addAll(producer.getSupportedFormats());
        }


        return formats;
    }

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     *
     * @throws ServiceException DOCUMENT ME!
     */
    public void execute(Request req) throws ServiceException {
        GetLegendGraphicRequest request = (GetLegendGraphicRequest) req;
        GetLegendGraphicProducerSpi glf = getProducerFactory(request.getFormat());
        this.producer = glf.createLegendProducer(request.getFormat());
        this.producer.produceLegendGraphic(request);
    }

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     * @return DOCUMENT ME!
     */
    private static GetLegendGraphicProducerSpi getProducerFactory(
        String mimeType) {
        Iterator it = FactoryFinder.factories(GetLegendGraphicProducerSpi.class);
        GetLegendGraphicProducerSpi glf = null;


        while (it.hasNext()) {
            GetLegendGraphicProducerSpi tmpGlf = (GetLegendGraphicProducerSpi) it
                .next();


            if (tmpGlf.canProduce(mimeType)) {
                glf = tmpGlf;


                break;
            }
        }

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

org.vfny.geoserver.wms.responses.GetLegendGraphicResponse

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