/* 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.kml;
import org.geotools.map.MapContext;
import org.geotools.map.MapLayer;
import org.geotools.xml.transform.TransformerBase;
import org.geotools.xml.transform.Translator;
import org.vfny.geoserver.wms.WMSMapContext;
import org.xml.sax.ContentHandler;
import org.xml.sax.helpers.AttributesImpl;
import java.util.Map;
/**
* Encodes the legend for a map layer as a kml ScreenOverlay.
*
* @author Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org
*
*/
public class KMLLegendTransformer extends KMLTransformerBase {
WMSMapContext mapContext;
public KMLLegendTransformer(WMSMapContext mapContext) {
this.mapContext = mapContext;
setNamespaceDeclarationEnabled(false);
}
public Translator createTranslator(ContentHandler handler) {
return new KMLLegendTranslator(handler);
}
class KMLLegendTranslator extends KMLTranslatorSupport {
public KMLLegendTranslator(ContentHandler contentHandler) {
super(contentHandler);
}
/**
* Encodes a KML ScreenOverlay wihch depicts the legend of a map.
*/
public void encode(Object o) throws IllegalArgumentException {
MapLayer mapLayer = (MapLayer) o;
if ( isStandAlone() ) {
start( "kml" );
}
start("ScreenOverlay");
element("name", "Legend");
element("overlayXY", null,
KMLUtils.attributes(
new String[] { "x", "0", "y", "0", "xunits", "pixels", "yunits", "pixels" }));
element("screenXY", null,
KMLUtils.attributes(
new String[] { "x", "10", "y", "20", "xunits", "pixels", "yunits", "pixels" }));
start("Icon");
//reference the image as a remote wms call
String legendOptions = (String) mapContext.getRequest().getRawKvp().get("LEGEND_OPTIONS");
String[] kvpArray = null;
if (legendOptions != null) {
kvpArray = new String[] { "LEGEND_OPTIONS", legendOptions };
}
element("href", KMLUtils.getLegendGraphicUrl(mapContext, mapLayer, kvpArray));
end("Icon");
end("ScreenOverlay");
if ( isStandAlone() ) {
end( "kml" );
}
}
}
}