| gvSIG desktop 1

import java.util.ArrayList;

import java.util.Iterator;

import com.hardcode.gdbms.engine.data.driver.DriverException;

import com.iver.cit.gvsig.fmap.MapContext;

import com.iver.cit.gvsig.fmap.layers.LayerDrawEvent;

 * Abstract class for the classes that make able 

public abstract class ComposedLayer {

	ArrayList pendingLayersEvents= new ArrayList(); 

	MapContext mapContext = null; 

	public ComposedLayer(){

	}

	public void setMapContext(MapContext mapContext) {

		this.mapContext = mapContext;

	}

	public abstract boolean canAdd(FLayer layer);

	 * Adds the layer to the draw group. 

	 * You have to implements the doAdd(FLayer) method.

	 * 

	 * 

	public final void add(FLayer layer) throws Exception {

		if (this.mapContext == null){

			this.mapContext =layer.getMapContext();

		}

        doAdd(layer);

    	pendingLayersEvents.add(layer);		

	}

	 * You have to implements the doDraw method. 

    public final void draw(BufferedImage image, Graphics2D g, ViewPort viewPort,

			Cancellable cancel,double scale) throws ReadDriverException {

    	doDraw(image, g, viewPort, cancel, scale);

    	fireLayerDrawingEvents(g,viewPort);

		pendingLayersEvents.clear();    	

    }

	/**

	 * Fires the event LayerDrawEvent.LAYER_AFTER_DRAW for every

	 * layers of the group.

	 * 

	 *  

	 *  @see com.iver.cit.gvsig.fmap.layers.LayerDrawEvent

	 * 

	 */

	private void fireLayerDrawingEvents(Graphics2D g, ViewPort viewPort) {

		Iterator iter = pendingLayersEvents.iterator();

		LayerDrawEvent afterEvent;

		FLayer layer = null ;

		while (iter.hasNext()) {

			layer =(FLayer)iter.next();

			afterEvent = new LayerDrawEvent(layer, g, viewPort, LayerDrawEvent.LAYER_AFTER_DRAW);

			System.out.println("+++ evento " + afterEvent.getLayer().getName());

			mapContext.fireLayerDrawingEvent(afterEvent);

		}

	}

	/**

	 * Adds the layer to the draw group.

	 * Specific implementation. 

	 * 

	 * @see com.iver.cit.gvsig.fmap.layers.layerOperations.ComposedLayer#add(FLayer)

	 * 

	 * @see com.iver.cit.gvsig.fmap.layers.layerOperations.ComposedLayer#canAdd(FLayer)

	 * 

	 * @param layer

	 * @throws Exception 

	 */

	protected abstract void doAdd(FLayer layer) throws Exception ;

	/**

	 * Draws all the group in one pass.

	 * Specific implementation. 

	 *

	 * @see  com.iver.cit.gvsig.fmap.layers.layerOperations.ComposedLayer#draw(BufferedImage, Graphics2D, ViewPort, Cancellable, double)

	 *

	 * @see  com.iver.cit.gvsig.fmap.layers.FLayer#draw(BufferedImage, Graphics2D, ViewPort, Cancellable, double)

	 */	

	protected abstract void doDraw(BufferedImage image, Graphics2D g, ViewPort viewPort,

			Cancellable cancel,double scale) throws ReadDriverException ;