Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.mapcontext.layers;

import java.awt.Image;

import java.awt.geom.Point2D;

import java.net.URI;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.dal.DataTypes;

import org.gvsig.fmap.dal.exception.ReadException;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.fmap.mapcontext.MapContext;

import org.gvsig.fmap.mapcontext.MapContextLocator;

import org.gvsig.fmap.mapcontext.exceptions.LoadLayerException;

import org.gvsig.fmap.mapcontext.exceptions.ReloadLayerException;

import org.gvsig.fmap.mapcontext.exceptions.StartEditionLayerException;

import org.gvsig.fmap.mapcontext.impl.DefaultMapContextManager;

import org.gvsig.fmap.mapcontext.layers.operations.ComposedLayer;

import org.gvsig.fmap.mapcontext.rendering.legend.events.LegendChangedEvent;

import org.gvsig.fmap.mapcontext.rendering.legend.events.listeners.LegendListener;

import org.gvsig.metadata.MetadataContainer;

import org.gvsig.metadata.MetadataLocator;

import org.gvsig.metadata.MetadataManager;

import org.gvsig.metadata.exceptions.MetadataException;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dispose.impl.AbstractDisposable;

import org.gvsig.tools.dynobject.DynClass;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.dynobject.exception.DynFieldNotFoundException;

import org.gvsig.tools.dynobject.exception.DynMethodException;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.persistence.PersistenceManager;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

import org.gvsig.tools.util.Callable;

import org.slf4j.LoggerFactory;

/**

 * <p>Implementation of the common characteristics of all layers: visibility, activation, name, ...</p>

 *

 * <p>Represents the definition of a basic layer, implementing {@link FLayer FLayer}, and new functionality:

 * <ul>

 *  <li>Supports transparency.

 *  <li>Notification of evens produced using this layer.

 *  <li>Can have internal virtual layers.

 *  <li>Can have a text layer.

 *  <li>Supports an strategy for visit its geometries.

 *  <li>Can have an image in the <i>TOC (table of contents)</i> associated to the state of this layer.

 * </ul>

 * </p>

 *

 * <p>Each graphical layer will inherit from this class and adapt to its particular logic and model according

 *  its nature.</p>

 *

 * @see FLayer

 * @see FLayerStatus

 */

public abstract class FLyrDefault extends AbstractDisposable implements FLayer, FLayerHidesArea,

                LayerListener {

        /**

         * Useful for debug the problems during the implementation.

         */

        final static private org.slf4j.Logger logger = LoggerFactory.getLogger(FLyrDefault.class);

        private LayerChangeSupport layerChangeSupport = new LayerChangeSupport();

        /**

         * Flag to set the layer as a temporary layer.

         */

        private boolean temporary;

        /**

         * Path to the upper layer which this layer belongs.

         *

         * @see #getParentLayer()

         * @see #setParentLayer(FLayers)

         */

        private FLayers parentLayer = null;

        /**

         * Transparency level of this layer in the range 0-255. By default 255.

         * 0   --> Transparent

         * 255 --> Opaque

         *

         * @see #getTransparency()

         * @see #setTransparency(int)

         */

        private int transparency = 255;

        /**

         * Coordinate transformation.

         *

         * @see #getCoordTrans()

         * @see #setCoordTrans(ICoordTrans)

         */

        private ICoordTrans ct;

        /**

         * Minimum scale, >= 0 or -1 if not defined. By default -1.

         *

         * @see #getMinScale()

         * @see #setMinScale(double)

         */

        private double minScale = -1; // -1 indica que no se usa

        /**

         * Maximum scale, >= 0 or -1 if not defined. By default -1.

         *

         * @see #getMaxScale()

         * @see #setMaxScale(double)

         */

        private double maxScale = -1;

        //        private boolean isInTOC = true;

        /**

         * Array list with all listeners registered to this layer.

         *

         * @see #getLayerListeners()

         * @see #removeLayerListener(LayerListener)

         * @see #callEditionChanged(LayerEvent)

         */

        protected Set<LayerListener> layerListeners = new HashSet<>();

        //by default, all is active, visible and avalaible

        /**

         * Status of this layer.

         *

         * @see #getFLayerStatus()

         * @see #setFLayerStatus(FLayerStatus)

         * @see #isActive()

         * @see #setActive(boolean)

         * @see #isVisible()

         * @see #setVisible(boolean)

         * @see #visibleRequired()

         * @see #isEditing()

         * @see #setEditing(boolean)

         * @see #isInTOC()

         * @see #isCachingDrawnLayers()

         * @see #setCachingDrawnLayers(boolean)

         * @see #isDirty()

         * @see #setDirty(boolean)

         * @see #isAvailable()

         * @see #setAvailable(boolean)

         * @see #isOk()

         * @see #isWritable()

         * @see #getNumErrors()

         * @see #getError(int)

         * @see #getErrors()

         * @see #addError(BaseException)

         */

        private FLayerStatus status = new FLayerStatus();

        /**

         * Image drawn shown in the TOC according the status of this layer.

         *

         * @see #getTocStatusImage()

         * @see #setTocStatusImage(Image)

         */

        private Image tocStatusImage;

        protected MetadataContainer metadataContainer;

        /**

         * Draw version of the context. It's used for know when de componend has

         * changed any visualization property

         *

         *  @see getDrawVersion

         *  @see updateDrawVersion

         */

        private long drawVersion= 0L;

        private ExtendedPropertiesHelper properties = new ExtendedPropertiesHelper();

        public FLyrDefault(MetadataContainer metadataContainer) {

                this.metadataContainer = metadataContainer;

        }

        public FLyrDefault() {

                this(MetadataLocator

                        .getMetadataManager()

                                .createMetadataContainer(FLayer.METADATA_DEFINITION_NAME)

                );

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getProperty(java.lang.Object)

         */

        public Object getProperty(Object key) {

                return properties.getProperty(key);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setProperty(java.lang.Object, java.lang.Object)

         */

        public void setProperty(Object key, Object val) {

                properties.setProperty(key, val);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getExtendedProperties()

         */

        public Map getExtendedProperties() {

                return properties.getExtendedProperties();

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setActive(boolean)

         */

        public void setActive(boolean selected) {

                status.active = selected;

                callActivationChanged(LayerEvent.createActivationChangedEvent(this,

                "active"));

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isActive()

         */

        public boolean isActive() {

                return status.active;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setName(java.lang.String)

         */

        public void setName(String name) {

                this.metadataContainer.setDynValue(METADATA_NAME, name);

                callNameChanged(LayerEvent.createNameChangedEvent(this, "name"));

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getName()

         */

        public String getName() {

            String name = "(unknow)";

            try {

                name = (String) this.metadataContainer.getDynValue(METADATA_NAME);

            } catch( Throwable th) {

                logger.warn("Can't retrive the layer name.");

            }

            return name;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#load()

         */

    public void load() throws LoadLayerException {

        MetadataManager manager = MetadataLocator.getMetadataManager();

        try {

            manager.loadMetadata(this);

        } catch (MetadataException e) {

            throw new LoadLayerException("Can't load metadata.", e);

        }

        DefaultMapContextManager mcmanager = (DefaultMapContextManager) MapContextLocator.getMapContextManager();

        mcmanager.notifyLoadLayer(this);

    }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setVisible(boolean)

         */

        public void setVisible(boolean visibility) {

                if (status.visible != visibility){

                        status.visible = visibility;

                        this.updateDrawVersion();

                        //                        if (this.getMapContext() != null){

                        //                                this.getMapContext().clearAllCachingImageDrawnLayers();

                        //                        }

                        callVisibilityChanged(LayerEvent.createVisibilityChangedEvent(this,

                        "visible"));

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isVisible()

         */

        public boolean isVisible() {

                return status.visible && status.available;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getParentLayer()

         */

        public FLayers getParentLayer() {

                return parentLayer;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setParentLayer(com.iver.cit.gvsig.fmap.layers.FLayers)

         */

        public void setParentLayer(FLayers root) {

                if (this.parentLayer != root){

                        this.parentLayer = root;

                        this.updateDrawVersion();

                }

        }

        /**

         * <p>Inserts the projection to this layer.</p>

         *

         * @param proj information about the new projection

         *

         * @see #isReprojectable()

         * @see #reProject(MapControl)

         */

        public void setProjection(IProjection proj) {

                IProjection curProj = this.getProjection();

                if (curProj == proj) {

                        return;

                }

                if (curProj != null && curProj.equals(proj)){

                        return;

                }

                this.updateDrawVersion();

                this.metadataContainer.setDynValue(METADATA_CRS, proj);

                // Comprobar que la proyecci?n es la misma que la de FMap

                // Si no lo es, es una capa que est? reproyectada al vuelo

                if ((proj != null) && (getMapContext() != null)) {

                        if (proj != getMapContext().getProjection()) {

                                ICoordTrans ct = proj.getCT(getMapContext().getProjection());

                                setCoordTrans(ct);

                                logger.debug("Cambio proyecci?n: FMap con "

                                                + getMapContext().getProjection().getAbrev() + " y capa "

                                                + getName() + " con " + proj.getAbrev());

                        }

                }

        }

        /*

         * (non-Javadoc)

         * @see org.cresques.geo.Projected#getProjection()

         */

        public IProjection getProjection() {

                return (IProjection) this.metadataContainer.getDynValue(METADATA_CRS);

        }

        /**

         * <p>Changes the projection of this layer.</p>

         * <p>This method will be overloaded in each kind of layer, according its specific nature.</p>

         *

         * @param mapC <code>MapControl</code> instance that will reproject this layer

         *

         * @return <code>true<code> if the layer has been created calling {@link FLayers#addLayer(FLayer) FLayers#addLayer}. But returns <code>false</code>

         *  if the load control logic of this layer is in the reprojection method

         *

         * @see #isReprojectable()

         * @see #setProjection(IProjection)

         */

        public void reProject(ICoordTrans arg0) {

        }

        /**

         * Returns the transparency level of this layer, in the range 0-255 .

         *

         * @return the transparency level

         *

         * @see #setTransparency(int)

         */

        public int getTransparency() {

                return transparency;

        }

        /**

         * Inserts the transparency level for this layer, the range allowed is 0-255 .

         *

         * @param trans the transparency level

         *

         * @see #getTransparency()

         */

        public void setTransparency(int trans) {

                if (this.transparency != trans){

                        transparency = trans;

                        this.updateDrawVersion();

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getMapContext()

         */

        public MapContext getMapContext() {

                if (getParentLayer() != null) {

                        return getParentLayer().getMapContext();

                } else {

                        return null;

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#addLayerListener(com.iver.cit.gvsig.fmap.layers.LayerListener)

         */

        public boolean addLayerListener(LayerListener o) {

            if( o == null ) {

                return true;

            }

            return layerListeners.add(o);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getLayerListeners()

         */

        public LayerListener[] getLayerListeners() {

                return (LayerListener[])layerListeners.toArray(new LayerListener[0]);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#removeLayerListener(com.iver.cit.gvsig.fmap.layers.LayerListener)

         */

        public boolean removeLayerListener(LayerListener o) {

                return layerListeners.remove(o);

        }

        /**

         *

         */

        private void callDrawValueChanged(LayerEvent e) {

           for (LayerListener listener : this.layerListeners) {

               try {

                   listener.drawValueChanged(e);

               } catch (Exception ex) {

                   logger.warn("Error calling listener '"+listener.toString()+"'.", ex);

               }

           }                

        }

        /**

         * Called by the method {@linkplain #setName(String)}. Notifies all listeners associated to this layer,

         *  that its name has changed.

         *

         * @param e a layer event with the name of the property that has changed

         *

         * @see #setName(String)

         */

        private void callNameChanged(LayerEvent e) {

           for (LayerListener listener : this.layerListeners) {

               try {

                   listener.nameChanged(e);

               } catch (Exception ex) {

                   logger.warn("Error calling listener '"+listener.toString()+"'.", ex);

               }

           }                

        }

        /**

         * Called by the method {@linkplain #setVisible(boolean)}. Notifies all listeners associated to this layer,

         *  that its visibility has changed.

         *

         * @param e a layer event with the name of the property that has changed

         *

         * @see #setVisible(boolean)

         */

        private void callVisibilityChanged(LayerEvent e) {

           for (LayerListener listener : this.layerListeners) {

               try {

                   listener.visibilityChanged(e);

               } catch (Exception ex) {

                   logger.warn("Error calling listener '"+listener.toString()+"'.", ex);

               }

           }                                

        }

        /**

         * Called by the method {@linkplain #setActive(boolean)}. Notifies all listeners associated to this layer,

         *  that its active state has changed.

         *

         * @param e a layer event with the name of the property that has changed

         *

         * @see #setActive(boolean)

         */

       private void callActivationChanged(LayerEvent e) {

           for (LayerListener listener : this.layerListeners) {

               try {

                   listener.activationChanged(e);

               } catch (Exception ex) {

                   logger.warn("Error calling listener '"+listener.toString()+"'.", ex);

               }

           }

       }

        /**

         * Returns the virtual layers associated to this layer.

         *

         * @return a node with the layers

         *

         * @see #setVirtualLayers(FLayers)

         */

        //        public FLayers getVirtualLayers() {

        //                return virtualLayers;

        //        }

        /**

         * Inserts virtual layers to this layer.

         *

         * @param virtualLayers a node with the layers

         *

         * @see #getVirtualLayers()

         */

        //        public void setVirtualLayers(FLayers virtualLayers) {

        //                this.virtualLayers = virtualLayers;

        //        }

        /**

         * Sets transformation coordinates for this layer.

         *

         * @param ct an object that implements the <code>ICoordTrans</code> interface, and with the transformation coordinates

         *

         * @see #getCoordTrans()

         */

        public void setCoordTrans(ICoordTrans ct) {

                if (this.ct == ct){

                        return;

                }

                if (this.ct != null && this.ct.equals(ct)){

                        return;

                }

                this.ct = ct;

                this.updateDrawVersion();

        }

        /**

         * Returns the transformation coordinates of this layer.

         *

         * @return an object that implements the <code>ICoordTrans</code> interface, and with the transformation coordinates

         *

         * @see #setCoordTrans(ICoordTrans)

         */

        public ICoordTrans getCoordTrans() {

                return ct;

        }

        /**

         * <p>Method called by {@link FLayers FLayers} to notify this layer that is going to be added.

         *  This previous notification is useful for the layers that need do something before being added. For

         *  example, the raster needs reopen a file that could have been closed recently.</p>

         */

        public void wakeUp() throws LoadLayerException {

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getMinScale()

         */

        public double getMinScale() {

                return minScale;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getMaxScale()

         */

        public double getMaxScale() {

                return maxScale;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setMinScale(double)

         */

        public void setMinScale(double minScale) {

                if (this.minScale != minScale){

                        this.minScale = minScale;

                        this.updateDrawVersion();

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setMaxScale(double)

         */

        public void setMaxScale(double maxScale) {

                if (this.maxScale != maxScale){

                        this.maxScale = maxScale;

                        this.updateDrawVersion();

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isWithinScale(double)

         */

        public boolean isWithinScale(double scale) {

                boolean bVisible = true;

                if (getMinScale() != -1) {

                        if (scale < getMinScale()){

                                bVisible = false;

                        }

                }

                if (getMaxScale() != -1) {

                        if (scale > getMaxScale()) {

                                bVisible = false;

                        }

                }

                return bVisible;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setEditing(boolean)

         */

        public void setEditing(boolean b) throws StartEditionLayerException {

                status.editing = b;

        }

        /**

         * Called by some version of the method {@linkplain #setEditing(boolean)} overwritten. Notifies

         *  all listeners associated to this layer, that its edition state has changed.

         *

         * @param e a layer event with the name of the property that has changed

         *

         * @see #setEditing(boolean)

         */

        protected void callEditionChanged(LayerEvent e) {

           for (LayerListener listener : this.layerListeners) {

               try {

                   listener.editionChanged(e);

               } catch (Exception ex) {

                   logger.warn("Error calling listener '"+listener.toString()+"'.", ex);

               }

           } 

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isEditing()

         */

        public boolean isEditing() {

                return status.editing;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getTocImageIcon()

         */

        public String getTocImageIcon() {

                return "layer-icon";

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isInTOC()

         */

        public boolean isInTOC() {

                return status.inTOC;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setInTOC(boolean)

         */

        public void setInTOC(boolean b) {

                status.inTOC=b;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isAvailable()

         */

        public boolean isAvailable() {

                return status.available;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setAvailable(boolean)

         */

        public void setAvailable(boolean available) {

                if (status.available != available){

                        status.available = available;

                        this.updateDrawVersion();

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#reload()

         */

        public void reload() throws ReloadLayerException {

                this.setAvailable(true);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getFLayerStatus()

         */

        public FLayerStatus getFLayerStatus(){

                return status.cloneStatus();

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#setFLayerStatus(com.iver.cit.gvsig.fmap.layers.FLayerStatus)

         */

        public void setFLayerStatus(FLayerStatus status){

                if (!this.status.equals(status)){

                        this.status = status;

                        this.updateDrawVersion();

                }

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isOk()

         */

        public boolean isOk(){

                return status.isOk();

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getNumErrors()

         */

        public int getNumErrors(){

                return status.getNumErrors();

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getError(int)

         */

        public BaseException getError(int i){

                return status.getError(i);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getErrors()

         */

        public List getErrors(){

                return status.getErrors();

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#addError(BaseException)

         */

        @Override

        public void addError(BaseException exception){

                status.addLayerError(exception);

        }

        @Override

        public void setError(Exception ex) {

            this.status.setLayerError(ex);

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#visibleRequired()

         */

        public boolean visibleRequired() {

                return status.visible;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getInfoString()

         */

        public String getInfoString() {

                return null;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#isWritable()

         */

        public boolean isWritable() {

                return status.writable;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#cloneLayer()

         */

        public FLayer cloneLayer() throws Exception {

                return this;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.layers.FLayer#getTocStatusImage()

         */

        public Image getTocStatusImage() {

            return tocStatusImage;

        }

        /**

         * Inserts the image icon that will be shown in the TOC next to this layer, according its status.

         *

         * @param tocStatusImage the image

         *

         * @see #getTocStatusImage()

         */

        public void setTocStatusImage(Image tocStatusImage) {

                this.tocStatusImage = tocStatusImage;

                logger.debug("setTocStatusImage " + tocStatusImage + " sobre capa " + this.getName());

        }

        public ComposedLayer newComposedLayer() {

                return null;

        }

        public boolean allowLinks()

        {

                return false;

        }

        public AbstractLinkProperties getLinkProperties()

        {

                return null;

        }

        public URI[] getLink(Point2D point, double tolerance) throws ReadException{

                return null;

        }

        public void addLegendListener(LegendListener listener) {

            if( listener == null ) {

                return ;

            }

            layerChangeSupport.addLayerListener(listener);

        }

        /**

     * @param e

         * @see LayerChangeSupport#callLegendChanged(LegendChangedEvent)

         */

        protected void callLegendChanged(LegendChangedEvent e) {

                layerChangeSupport.callLegendChanged(e);

                if(parentLayer != null) {

                        parentLayer.callLegendChanged(e);

                }

        }

        /**

         * @see LayerChangeSupport#removeLayerListener(LegendListener)

         */

        public void removeLegendListener(LegendListener listener) {

                layerChangeSupport.removeLayerListener(listener);

        }

        public String getClassName() {

                return this.getClass().getName();

        }

        public void delegate(DynObject dynObject) {

                this.metadataContainer.delegate(dynObject);

        }

        public DynClass getDynClass() {

                return this.metadataContainer.getDynClass();

        }

        public Object getDynValue(String name) throws DynFieldNotFoundException {

                return this.metadataContainer.getDynValue(name);

        }

        public boolean hasDynValue(String name) {

                return this.metadataContainer.hasDynValue(name);

        }

        public void implement(DynClass dynClass) {

                this.metadataContainer.implement(dynClass);

        }

        public Object invokeDynMethod(int code, Object[] args)

        throws DynMethodException {

                return this.metadataContainer.invokeDynMethod(this, code, args);

        }

        public Object invokeDynMethod(String name, Object[] args)

        throws DynMethodException {

                return this.metadataContainer.invokeDynMethod(this, name, args);

        }

        public void setDynValue(String name, Object value)

        throws DynFieldNotFoundException {

                this.metadataContainer.setDynValue(name, value);

        }

        public long getDrawVersion() {

                return this.drawVersion;

        }

        protected void updateDrawVersion(){

                this.drawVersion++;

                this.callDrawValueChanged(LayerEvent.createDrawValuesChangedEvent(this, ""));

                if (this.parentLayer != null){

                        this.parentLayer.updateDrawVersion();

                }

        }

        public boolean hasChangedForDrawing(long value){

                return this.drawVersion > value;

        }

        public void activationChanged(LayerEvent e) {

        }

        public void drawValueChanged(LayerEvent e) {

                this.updateDrawVersion();

        }

        public void editionChanged(LayerEvent e) {

        }

        public void nameChanged(LayerEvent e) {

        }

        public void visibilityChanged(LayerEvent e) {

        }

        // ========================================================

        public void saveToState(PersistentState state) throws PersistenceException {

            try {

                state.set("parentLayer", (Persistent)parentLayer);

                state.set("status",status);

                state.set("minScale", minScale);

                state.set("maxScale", maxScale);

                state.set("transparency",transparency);

                state.set("coordTrans",ct);

                state.set("name", getName());

                state.set("crs", getProjection());

                state.set("properties",properties.getExtendedProperties());

            } catch(PersistenceException ex) {

                logger.warn("Can't save to persistent state the layer '"+this.getName()+"'.");

                throw ex;

            } catch(RuntimeException ex) {

                logger.warn("Can't save to persistent state the layer '"+this.getName()+"'.");

                throw ex;

            }

        }

        public void loadFromState(PersistentState state) throws PersistenceException {

            try {

                this.setDynValue(METADATA_NAME, state.getString("name"));

                this.setDynValue(METADATA_CRS, state.get("crs"));

                this.parentLayer = (FLayers) state.get("parentLayer");

                this.status = (FLayerStatus) state.get("status");

                this.minScale = state.getDouble("minScale");

                this.maxScale = state.getDouble("maxScale");

                this.transparency = state.getInt("transparency");

                this.ct = (ICoordTrans) state.get("coordTrans");

                this.properties.setExtendedProperties((Map)state.get("properties"));

            } catch(PersistenceException ex) {

                logger.warn("Can't load from persietent state the layer '"+this.getName()+"'.");

                throw ex;

            } catch(RuntimeException ex) {

                logger.warn("Can't load from persietent state the layer '"+this.getName()+"'.");

                throw ex;

            }

        }

    public static class RegisterPersistence implements Callable {

        public Object call() {

                PersistenceManager manager = ToolsLocator.getPersistenceManager();

                DynStruct definition = manager.addDefinition(

                                FLyrDefault.class,

                                "FLyrDefault",

                                "FLyrDefault Persistence definition",

                                null, 

                                null

                );

                definition.addDynFieldString("name").setMandatory(false);

                definition.addDynFieldInt("transparency").setMandatory(true);

                definition.addDynFieldDouble("minScale").setMandatory(true);

                definition.addDynFieldDouble("maxScale").setMandatory(true);

                definition.addDynFieldObject("crs").setClassOfValue(IProjection.class).setMandatory(false);

                definition.addDynFieldObject("parentLayer").setClassOfValue(FLayers.class).setMandatory(false);

                definition.addDynFieldObject("coordTrans").setClassOfValue(ICoordTrans.class).setMandatory(false);

                definition.addDynFieldObject("status").setClassOfValue(FLayerStatus.class).setMandatory(true);

                definition.addDynFieldMap("properties").setClassOfItems(Object.class)

                                .setMandatory(true);

            return Boolean.TRUE;

        }

    }

//        /**

//         * Splits string into an array of strings

//         * @param input input string

//         * @param sep separator string

//         * @return an array of strings

//         */

//        public static String[] splitString(String input, String sep) {

//                return Pattern.compile(sep).split(input, 0);

//        }

        public void clear() {

                if (metadataContainer != null) {

                        metadataContainer.clear();

                }

        }

    public String getMetadataName() throws MetadataException {

        return FLayer.METADATA_DEFINITION_NAME;

    }

        public static class RegisterMetadata implements Callable {

            public Object call() {

                MetadataManager metadataManager = MetadataLocator.getMetadataManager();

                DynStruct metadataDefinition = metadataManager.getDefinition(FLayer.METADATA_DEFINITION_NAME);

                if ( metadataDefinition == null ) {

                    try {

                        metadataDefinition = metadataManager.addDefinition(

                                FLayer.METADATA_DEFINITION_NAME,

                                FLayer.METADATA_DEFINITION_DESCRIPTION);

                        metadataDefinition.addDynField(FLayer.METADATA_NAME)

                                .setMandatory(true);

                        IProjection ipr

                                = MapContextLocator.getMapContextManager().getDefaultCRS();

                        metadataDefinition.addDynFieldObject(FLayer.METADATA_CRS)

                                .setType(DataTypes.CRS).setMandatory(true)

                                .setDefaultFieldValue(ipr);

                    } catch (MetadataException e) {

                        logger.warn("Can't create metadata definition for 'Layer'", e);

                    }

                }

                return Boolean.TRUE;

            }

        }

        public String toString() {

                return this.getName();

        }

        public boolean hidesThisArea(Envelope area) {

                return false;

        }

        public boolean isTemporary() {

            return this.temporary;

        }

        public void setTemporary(boolean temporary) {

            this.temporary = temporary;

        }

}