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.Graphics2D;

import java.awt.Point;

import java.awt.image.BufferedImage;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

import java.util.ListIterator;

import java.util.Set;

import java.util.TreeSet;

import java.util.function.Predicate;

import org.apache.commons.lang3.StringUtils;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import org.gvsig.compat.print.PrintAttributes;

import org.gvsig.fmap.dal.DataStore;

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

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

import org.gvsig.fmap.dal.feature.FeatureSelection;

import org.gvsig.fmap.dal.feature.FeatureStore;

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

import org.gvsig.fmap.mapcontext.MapContext;

import org.gvsig.fmap.mapcontext.MapContextLocator;

import org.gvsig.fmap.mapcontext.MapContextRuntimeException;

import org.gvsig.fmap.mapcontext.Messages;

import org.gvsig.fmap.mapcontext.ViewPort;

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

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

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

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

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

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

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

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

import org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.ILabelable;

import org.gvsig.metadata.exceptions.MetadataException;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynObjectSet;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.dynobject.impl.MultiDynObjectSet;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.persistence.PersistenceManager;

import org.gvsig.tools.persistence.PersistentState;

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

import org.gvsig.tools.task.Cancellable;

import org.gvsig.tools.util.Callable;

import org.gvsig.tools.visitor.Visitor;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * <p>

 * Represents a generic collection of layers, that can be represented as a node

 * in a tree of nodes of layers.</p>

 *

 * <p>

 * Adapts the basic functionality implemented for a layer in the abstract class

 * <code>FLyrDefault</code>, to a collection of layers, implementing, as well,

 * specific methods for this kind of object, defined in the interfaces

 * <code>VectorialData</code>, <code>LayerCollection</code>, and

 * <code>InfoByPoint</code>.</p>

 *

 * @see FLyrDefault

 */

public class FLayers extends FLyrDefault implements LayerCollection,

        InfoByPoint, List<FLayer> {

    /**

     * List with all listeners registered for this kind of node.

     */

    protected ArrayList<LayerCollectionListener> layerCollectionListeners = null;

    /**

     * A synchronized list with the layers.

     */

    protected List<FLayer> layers = null;

    protected MapContext fmap;

    /**

     * Useful for debug the problems during the implementation.

     */

    private static final Logger LOGGER = LoggerFactory.getLogger(FLayers.class);

    public static final Predicate<FLayer> LAYER_ACTIVE = new Predicate<FLayer>() {

        @Override

        public boolean test(FLayer layer) {

            return layer.isActive();

        }

    };

    public static final Predicate<FLayer> LAYER_AVALAIBLE = new Predicate<FLayer>() {

        @Override

        public boolean test(FLayer layer) {

            return layer.isAvailable();

        }

    };

    public static Predicate<FLayer> LAYER_FLYRVECT = new Predicate<FLayer>() {

        @Override

        public boolean test(FLayer layer) {

            return layer instanceof FLyrVect;

        }

    };

    public static Predicate<FLayer> LAYER_SELECTION_AVAILABLE = new Predicate<FLayer>() {

        @Override

        public boolean test(FLayer layer) {

            if (layer instanceof FLyrVect) {

                try {

                    FeatureStore store = ((FLyrVect) layer).getFeatureStore();

                    if (store.isFeatureSelectionAvailable()) {

                        return true;

                    }

                } catch (Exception ex) {

                    return false;

                }

            }

            return false;

        }

    };

    public static Predicate<FLayer> LAYER_SELECTION_EMPTY = new Predicate<FLayer>() {

        @Override

        public boolean test(FLayer layer) {

            if (layer instanceof FLyrVect) {

                try {

                    FeatureStore store = ((FLyrVect) layer).getFeatureStore();

                    if (!store.isFeatureSelectionAvailable() || store.isFeatureSelectionEmpty()) {

                        return true;

                    }

                    return false;

                } catch (Exception ex) {

                    return true;

                }

            } else {

                return true;

            }

        }

    };

    public FLayers() {

        super();

        layerCollectionListeners = new ArrayList();

        layers = Collections.synchronizedList(new ArrayList());

    }

    @Override

    public void addLayerCollectionListener(LayerCollectionListener listener) {

        if (!layerCollectionListeners.contains(listener)) {

            layerCollectionListeners.add(listener);

        }

    }

    /*

     * (non-Javadoc)

     * @see com.iver.cit.gvsig.fmap.layers.layerOperations.LayerCollection#setAllVisibles(boolean)

     */

    @Override

    public void setAllVisibles(boolean visible) {

        FLayer lyr;

        for (int i = 0; i < layers.size(); i++) {

            lyr = ((FLayer) layers.get(i));

            lyr.setVisible(visible);

            if (lyr instanceof LayerCollection) {

                ((LayerCollection) lyr).setAllVisibles(visible);

            }

        }

    }

    @Override

    public void removeLayerCollectionListener(LayerCollectionListener listener) {

        layerCollectionListeners.remove(listener);

    }

    /**

     * Adds a layer on an specified position in this node.

     *

     * @param pos position in the inner list where the layer will be added

     * @param layer a layer

     */

    private void doAddLayer(int pos, FLayer layer) {

        layers.add(pos, layer);

        ToolsLocator.getDisposableManager().bind(layer);

        layer.setParentLayer(this);

        IProjection layerProj = layer.getProjection();

        if (layerProj != null && fmap != null) {

            IProjection mapContextProj = fmap.getProjection();

            // TODO REVISAR ESTO !!!!

            // Esta condici?n puede que no fuese exacta para todos los casos

            if (!layerProj.getAbrev().equals(mapContextProj.getAbrev())) {

                ICoordTrans ct = layerProj.getCT(mapContextProj);

                layer.setCoordTrans(ct);

            } else {

                layer.setCoordTrans(null);

            }

        }

        this.updateDrawVersion();

    }

    @Override

    public void addLayer(FLayer layer) {

        MapContext mco = this.getMapContext();

        if (mco != null) {

            /*

             * Get order manager from map context

             */

            int position = mco.getOrderManager().getPosition(this, layer);

            addLayer(position, layer);

        } else {

            /*

             * This happens when FLayers object is not in a

             * map context, so no order manager is available.

             */

            addLayer(layers.size(), layer);

        }

    }

    public void addLayer(DataStore store) {

        FLayer layer;

        try {

            layer = MapContextLocator.getMapContextManager().createLayer(

                    store.getName(),

                    store

            );

        } catch (LoadLayerException ex) {

            throw new RuntimeException("Can't create layer from store.", ex);

        }

        this.addLayer(layer);

    }

    /**

     * Adds a layer in an specified position in this node.

     *

     * @param pos

     * @param layer a layer

     */

    public void addLayer(int pos, FLayer layer) {

        try {

            if (layer instanceof FLayers) {

                FLayers layersToAdd = (FLayers) layer;

                if( fmap != null ) {

                    fmap.addAsCollectionListener(layersToAdd);

                }

            }

            callLayerAdding(LayerCollectionEvent.createLayerAddingEvent(layer));

            doAddLayer(pos, layer);

            callLayerAdded(LayerCollectionEvent.createLayerAddedEvent(layer));

        } catch (CancelationException e) {

            LOGGER.warn(e.getMessage());

        }

    }

    @Override

    public void moveTo(int from, int to) throws CancelationException {

        int newfrom = layers.size() - from - 1;

        int newto = layers.size() - to - 1;

        if (newfrom < 0 || newfrom >= layers.size() || newto < 0 || newto >= layers.size()) {

            return;

        }

        FLayer aux = (FLayer) layers.get(newfrom);

        callLayerMoving(LayerPositionEvent.createLayerMovingEvent(aux, newfrom, newto));

        layers.remove(newfrom);

        layers.add(newto, aux);

        this.updateDrawVersion();

        callLayerMoved(LayerPositionEvent.createLayerMovedEvent(aux, newfrom, newto));

    }

    /**

     * Removes an inner layer.

     *

     * @param lyr a layer

     */

    private void doRemoveLayer(FLayer lyr) {

        layers.remove(lyr);

        lyr.dispose();

        this.updateDrawVersion();

    }

    @Override

    public void removeLayer(FLayer lyr) throws CancelationException {

        callLayerRemoving(LayerCollectionEvent.createLayerRemovingEvent(lyr));

        doRemoveLayer(lyr);

        callLayerRemoved(LayerCollectionEvent.createLayerRemovedEvent(lyr));

    }

    @Override

    public void removeLayer(int idLayer) {

        FLayer lyr = (FLayer) layers.get(idLayer);

        callLayerRemoving(LayerCollectionEvent.createLayerRemovingEvent(lyr));

        this.doRemoveLayer(lyr);

//                layers.remove(idLayer);

//                this.updateDrawVersion();

        callLayerRemoved(LayerCollectionEvent.createLayerRemovedEvent(lyr));

    }

    @Override

    public void removeLayer(String layerName) {

        FLayer lyr;

        for (int i = 0; i < layers.size(); i++) {

            lyr = ((FLayer) layers.get(i));

            if (lyr.getName().compareToIgnoreCase(layerName) == 0) {

                removeLayer(i);

                break;

            }

        }

    }

    /**

     * Replace a layer identified by its name, by another.

     *

     * @param layerName the name of the layer to be replaced

     * @param layer the new layer

     * @throws org.gvsig.fmap.mapcontext.exceptions.LoadLayerException

     * @deprecated use {@link FLayers#replaceLayer(FLayer, FLayer)}

     */

    public void replaceLayer(String layerName, FLayer layer) throws LoadLayerException {

        replaceLayer(getLayer(layerName), layer);

    }

    /**

     * Replace a layer by another layer. It search recursively by all the

     * ILayerCollection nodes

     *

     * @param layer the layer to be replaced

     * @param newLayer the new layer

     * @throws org.gvsig.fmap.mapcontext.exceptions.LoadLayerException

     */

    public void replaceLayer(FLayer layer, FLayer newLayer) throws LoadLayerException {

        replaceLayer(this, layer, newLayer);

    }

    /**

     * Replace a layer by other layer. It search recursively by all the

     * ILayerCollection nodes

     *

     * @param parentLayer the parent layer

     * @param layer the layer to be replaced

     * @param newLayer the new layer

     * @throws LoadLayerException

     */

    private void replaceLayer(FLayers parentLayer, FLayer layer, FLayer newLayer) throws LoadLayerException {

        FLayer lyr;

        for (int i = 0; i < parentLayer.getLayersCount(); i++) {

            lyr = ((FLayer) parentLayer.getLayer(i));

            if (lyr.equals(layer)) {

                parentLayer.removeLayer(i);

                parentLayer.addLayer(i, newLayer);

                break;

            }

            if (lyr instanceof LayerCollection) {

                replaceLayer((FLayers) lyr, layer, newLayer);

            }

        }

    }

    @Override

    public FLayer[] getVisibles() {

        ArrayList array = new ArrayList();

        LayersIterator iter = new LayersIterator(this) {

            @Override

            public boolean evaluate(FLayer layer) {

                return layer.isVisible();

            }

        };

        while (iter.hasNext()) {

            array.add(iter.nextLayer());

        }

        return (FLayer[]) array.toArray(new FLayer[0]);

    }

    @Override

    public FLayer getLayer(int index) {

        return (FLayer) layers.get(index);

    }

    @Override

    public FLayer getLayer(final String layerName) {

        if( StringUtils.isBlank(layerName) ) {

            return null;

        }

        for (FLayer layer : this.layers) {

            if( layer!=null && StringUtils.equalsIgnoreCase(layer.getName(), layerName) ) {

                return layer;

            }

            if( layer instanceof FLayers ) {

                List<FLayer> theLayers = this.getLayers(new Predicate<FLayer>() {

                    @Override

                    public boolean test(FLayer layer) {

                        return StringUtils.equalsIgnoreCase(layer.getName(), layerName);

                    }

                });

                if( theLayers.isEmpty() ) {

                    return null;

                }

                return theLayers.get(0);

            }

        }

        return null;

    }

    @Override

    public FLayer getLayer(final DataStore store) {

        List<FLayer> theLayers = this.getLayers(new Predicate<FLayer>() {

            @Override

            public boolean test(FLayer layer) {

                return  layer instanceof SingleLayer && store == ((SingleLayer) layer).getDataStore();

            }

        });

        if( theLayers.isEmpty() ) {

            return null;

        }

        return theLayers.get(0);

    }

    private List<FLayer> toPlainList(FLayer layer) {

        return toPlainList(layer, new ArrayList<FLayer>(), null);

    }

    private List<FLayer> toPlainList(FLayer layer, Predicate<FLayer> filter) {

        return toPlainList(layer, new ArrayList<FLayer>(), filter);

    }

    private List<FLayer> toPlainList(FLayer layer, List<FLayer> result, Predicate<FLayer> filter) {

        if (layer instanceof FLayers) {

            FLayers layerGroup = (FLayers) layer;

            if (filter == null || filter.test(layer)) {

                result.add(layer);

            }

            for (int i = 0; i < layerGroup.getLayersCount(); i++) {

                toPlainList(layerGroup.getLayer(i), result, filter);

            }

        } else if( filter==null || filter.test(layer) ) {

            result.add(layer);

        }

        return result;

    }

    @Override

    public int getLayersCount() {

        return layers.size();

    }

    @Override

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

            Cancellable cancel, double scale) throws ReadException {

        // FIXME Arreglar este error

        throw new RuntimeException("Esto no deberia de llamarse");

    }

    /*

     * (non-Javadoc)

     *

     * @see com.iver.cit.gvsig.fmap.layers.FLayer#print(java.awt.Graphics2D,

     * com.iver.cit.gvsig.fmap.ViewPort,

     * com.iver.utiles.swing.threads.Cancellable, double,

     * javax.print.attribute.PrintAttributes)

     */

    @Override

    public void print(Graphics2D g, ViewPort viewPort, Cancellable cancel,

            double scale, PrintAttributes properties)

            throws ReadException {

        throw new RuntimeException("No deberia pasar por aqui");

    }

    public void print_old(Graphics2D g, ViewPort viewPort, Cancellable cancel,

            double scale, PrintAttributes properties)

            throws ReadException {

        this.print_old(g, viewPort, cancel, scale, properties, null);

    }

    /**

     * <p>

     * Checks all layers (each one as a sub-node of this node <i>collection of

     * layers</i>) of this collection and draws their requested properties. If a

     * node is a group of layers (<code>ComposedLayer</code>), executes it's

     * drawn.</p>

     *

     * <p>

     * All nodes which could group with the composed layer <code>group</code>,

     * will be drawn together. And once the <code>

     * group</code> is drawn, will be set to <code>null</code> if hasn't a

     * parent layer.</p>

     *

     * <p>

     * The particular implementation depends on the kind of each layer and

     * composed layer. And this process can be cancelled at any time by the

     * shared object <code>cancel</code>.</p>

     *

     * <p>

     * According the print quality, labels will be printed in different

     * resolution:

     * <ul>

     * <li><b>PrintQuality.DRAFT</b>: 72 dpi (dots per inch).</li>

     * <li><b>PrintQuality.NORMAL</b>: 300 dpi (dots per inch).</li>

     * <li><b>PrintQuality.HIGH</b>: 600 dpi (dots per inch).</li>

     * </ul>

     * </p>

     *

     * @param g for rendering 2-dimensional shapes, text and images on the

     * Java(tm) platform

     * @param viewPort the information for drawing the layers

     * @param cancel shared object that determines if this layer can continue

     * being drawn

     * @param scale the scale of the view. Must be between

     * {@linkplain FLayer#getMinScale()} and {@linkplain FLayer#getMaxScale()}.

     * @param properties properties that will be print

     * @param group a composed layer pending to paint; if this parameter is

     * <code>null</code>, the composed layer

     *

     * @return <code>null</code> if the layers in <code>group</code> had been

     * drawn or were <code>null</code>; otherwise, the <code>group</code>

     * @throws org.gvsig.fmap.dal.exception.ReadException

     *

     * @see FLayer#print(Graphics2D, ViewPort, Cancellable, double,

     * PrintAttributes)

     */

    public ComposedLayer print_old(Graphics2D g, ViewPort viewPort, Cancellable cancel, double scale, PrintAttributes properties, ComposedLayer group)

            throws ReadException {

        double dpi = 72;

        int resolution = properties.getPrintQuality();

        switch (resolution) {

            case PrintAttributes.PRINT_QUALITY_NORMAL:

                dpi = 300;

                break;

            case PrintAttributes.PRINT_QUALITY_HIGH:

                dpi = 600;

                break;

            case PrintAttributes.PRINT_QUALITY_DRAFT:

                dpi = 72;

                break;

            default:

                break;

        }

        // TODO: A la hora de imprimir, isWithinScale falla, porque est?

        // calculando la escala en pantalla, no para el layout.

        // Revisar esto.

        // TODO: We have to check when we have to call the drawLabels method when exists a ComposedLayer group.

        for (int i = 0; i < layers.size(); i++) {

            FLayer lyr = (FLayer) layers.get(i);

            if (!lyr.isVisible() || !lyr.isWithinScale(scale)) {

                continue;

            }

            try {

                // Checks for draw group (ComposedLayer)

                if (group != null) {

                    if (lyr instanceof FLayers) {

                        group = ((FLayers) lyr).print_old(g, viewPort, cancel, scale, properties, group);

                    } else {

                        // If layer can be added to the group, does it

                        if (lyr instanceof ILabelable

                                && ((ILabelable) lyr).isLabeled()

                                && ((ILabelable) lyr).getLabelingStrategy() != null

                                && ((ILabelable) lyr).getLabelingStrategy().shouldDrawLabels(scale)) {

                            group.add(lyr);

                        } else {

                            // draw the 'pending to draw' layer group

                            group.print(g, viewPort, cancel, scale, properties);

                            // gets a new group instance

                            if (lyr instanceof ILabelable

                                    && ((ILabelable) lyr).isLabeled()

                                    && ((ILabelable) lyr).getLabelingStrategy() != null

                                    && ((ILabelable) lyr).getLabelingStrategy().shouldDrawLabels(scale)) {

                                group = lyr.newComposedLayer();

                            } else {

                                group = null;

                            }

                            // if layer hasn't group, draws it inmediately

                            if (group == null) {

                                if (lyr instanceof FLayers) {

                                    group = ((FLayers) lyr).print_old(g, viewPort, cancel, scale, properties, group);

                                } else {

                                    lyr.print(g, viewPort, cancel, scale, properties);

                                    if (lyr instanceof ILabelable

                                            && ((ILabelable) lyr).isLabeled()

                                            && ((ILabelable) lyr).getLabelingStrategy() != null

                                            && ((ILabelable) lyr).getLabelingStrategy().shouldDrawLabels(scale)) {

                                        ILabelable lLayer = (ILabelable) lyr;

                                        lLayer.drawLabels(null, g, viewPort, cancel, scale, dpi);

                                    }

                                }

                            } else {

                                // add the layer to the group

                                group.setMapContext(fmap);

                                group.add(lyr);

                            }

                        }

                    }

                } else {

                    // gets a new group instance

                    group = lyr.newComposedLayer();

                    // if layer hasn't group, draws it inmediately

                    if (group == null) {

                        if (lyr instanceof FLayers) {

                            group = ((FLayers) lyr).print_old(g, viewPort, cancel, scale, properties, group);

                        } else {

                            lyr.print(g, viewPort, cancel, scale, properties);

                            if (lyr instanceof ILabelable && ((ILabelable) lyr).isLabeled()) {

                                ILabelable lLayer = (ILabelable) lyr;

                                lLayer.drawLabels(null, g, viewPort, cancel, scale, dpi);

                            }

                        }

                    } else {

                        // add the layer to the group

                        group.setMapContext(fmap);

                        group.add(lyr);

                    }

                }

            } catch (Exception e) {

                String mesg = Messages.getString("error_printing_layer") + " " + lyr.getName() + ": " + e.getMessage();

                if( fmap!=null ) {

                    fmap.addLayerError(mesg);

                }

                LOGGER.error(mesg, e);

            }

        }

        if (group != null && this.getParentLayer() == null) {

            //si tenemos un grupo pendiente de pintar, pintamos

            group.print(g, viewPort, cancel, scale, properties);

            group = null;

        }

        return group;

    }

    @Override

    @SuppressWarnings("UseSpecificCatch")

    public Envelope getFullEnvelope() {

        Envelope rAux = null;

        boolean first = true;

        for (FLayer capa : layers) {

            try {

                if (first) {

                    rAux = (Envelope) capa.getFullEnvelope().clone();

                    first = false;

                } else {

                    rAux.add(capa.getFullEnvelope());

                }

            } catch (Exception e) {

                LOGGER.warn("Can't calculate the envelope of the layer group '"+this.getName()+"'.",e);

            }

        }

        return rAux;

    }

    /**

     * Notifies all listeners associated to this collection of layers, that

     * another layer is going to be added or replaced in the internal list of

     * layers.

     *

     * @param event a layer collection event with the new layer

     */

    protected void callLayerAdding(LayerCollectionEvent event)

            throws CancelationException {

        ArrayList aux = (ArrayList) layerCollectionListeners.clone();

        for (Iterator iter = aux.iterator(); iter.hasNext();) {

            ((LayerCollectionListener) iter.next()).layerAdding(event);

        }

    }

    /**

     * Notifies all listeners associated to this collection of layers, that a

     * layer is going to be removed from the internal list of layers.

     *

     * @param event a layer collection event with the layer being removed

     *

     * @throws CancelationException any exception produced during the

     * cancellation of the driver.

     */

    protected void callLayerRemoving(LayerCollectionEvent event)

            throws CancelationException {

        ArrayList aux = (ArrayList) layerCollectionListeners.clone();

        for (Iterator iter = aux.iterator(); iter.hasNext();) {

            ((LayerCollectionListener) iter.next()).layerRemoving(event);

        }

    }

    /**

     * Notifies all listeners associated to this collection of layers, that a

     * layer is going to be moved in the internal list of layers.

     *

     * @param event a layer collection event with the layer being moved, and the

     * initial and final positions

     *

     * @throws CancelationException any exception produced during the

     * cancellation of the driver.

     */

    protected void callLayerMoving(LayerPositionEvent event)

            throws CancelationException {

        ArrayList aux = (ArrayList) layerCollectionListeners.clone();

        for (Iterator iter = aux.iterator(); iter.hasNext();) {

            ((LayerCollectionListener) iter.next()).layerMoving(event);

        }

    }

    /**

     * Notifies all listeners associated to this collection of layers, that

     * another layer has been added or replaced in the internal list of layers.

     *

     * @param event a layer collection event with the new layer

     */

    protected void callLayerAdded(LayerCollectionEvent event) {

        ArrayList aux = (ArrayList) layerCollectionListeners.clone();

        for (Iterator iter = aux.iterator(); iter.hasNext();) {

            ((LayerCollectionListener) iter.next()).layerAdded(event);

        }

    }

    /**

     * Notifies all listeners associated to this collection of layers, that

     * another layer has been removed from the internal list of layers.

     *

     * @param event a layer collection event with the layer removed

     */

    protected void callLayerRemoved(LayerCollectionEvent event) {

        ArrayList aux = (ArrayList) layerCollectionListeners.clone();

        for (Iterator iter = aux.iterator(); iter.hasNext();) {

            ((LayerCollectionListener) iter.next()).layerRemoved(event);

        }

    }

    /**

     * Notifies all listeners associated to this collection of layers, that

     * another layer has been moved in the internal list of layers.

     *

     * @param event a layer collection event with the layer moved, and the initial

     * and final positions

     */

    protected void callLayerMoved(LayerPositionEvent event) {

        ArrayList aux = (ArrayList) layerCollectionListeners.clone();

        for (Iterator iter = aux.iterator(); iter.hasNext();) {

            ((LayerCollectionListener) iter.next()).layerMoved(event);

        }

    }

    @Override

    public void saveToState(PersistentState state) throws PersistenceException {

        super.saveToState(state);

        state.set("mapContext", fmap);

        List layersToSave = new ArrayList();

        for (FLayer layer : this.layers) {

            if (!layer.isTemporary()) {

                layersToSave.add(layer);

            }

        }

        state.set("layers", layersToSave);

    }

    @Override

    public void loadFromState(PersistentState state) throws PersistenceException {

        super.loadFromState(state);

        setMapContext((MapContext) state.get("mapContext"));

        Iterator iter = state.getIterator("layers");

        while (iter.hasNext()) {

            FLayer item = (FLayer) iter.next();

            if(item == null){

                continue;

            }

            if (item instanceof FLayers) {

                FLayers layersToAdd = (FLayers) item;

                if (fmap != null) {

                    fmap.addAsCollectionListener(layersToAdd);

                }

            }

            // Cuando falla la carga de la capa desde la persistencia, puede

            // haberse perdido quien es el parent. Asi que lo asignamos aqui

            // por si acaso.

            item.setParentLayer(this);

            layers.add(item);

        }

    }

    @Override

    public MapContext getMapContext() {

        return fmap;

    }

    @Override

    public void setAllActives(boolean active) {

        FLayer lyr;

        for (int i = 0; i < layers.size(); i++) {

            lyr = ((FLayer) layers.get(i));

            lyr.setActive(active);

            if (lyr instanceof LayerCollection) {

                ((LayerCollection) lyr).setAllActives(active);

            }

        }

    }

    @Override

    public List<FLayer> getLayers(Predicate<FLayer> filter) {

        List<FLayer> theLayers = this.toPlainList(this, filter);

        return theLayers;

    }

    @Override

    public FLayer[] getActives() {

        List<FLayer> activeLayers = this.getLayers(new Predicate<FLayer>() {

            @Override

            public boolean test(FLayer layer) {

                return layer.isActive();

            }

        });

        return (FLayer[]) activeLayers.toArray(new FLayer[activeLayers.size()]);

    }

    @Override

    public double getMinScale() {

        return -1; // La visibilidad o no la controla cada capa

        // dentro de una colecci?n

    }

    @Override

    public double getMaxScale() {

        return -1;

    }

    @Override

    public void setMinScale(double minScale) {

        for (FLayer lyr : layers) {

            lyr.setMinScale(minScale);

        }

    }

    @Override

    public void setMaxScale(double maxScale) {

        for (FLayer lyr : layers) {

            lyr.setMinScale(maxScale);

        }

    }

    @Override

    public void setActive(boolean b) {

        super.setActive(b);

        for (FLayer layer : this.layers) {

            layer.setActive(b);

        }

    }

    public void setActive(boolean active, boolean applySublayers) {

        super.setActive(active);

        if(applySublayers){

            for (FLayer layer : this.layers) {

                layer.setActive(active);

            }

        }

    }

    @Override

    public boolean addLayerListener(LayerListener o) {

        for (FLayer layer : this.layers) {

            layer.addLayerListener(o);

        }

        return true;

    }

    @Override

    public DynObjectSet getInfo(Point p, double tolerance,

            Cancellable cancel) throws LoadLayerException, DataException {

        return getInfo(this.getMapContext().getViewPort().convertToMapPoint(p), tolerance);

    }

    @Override

    public DynObjectSet getInfo(Point p, double tolerance, Cancellable cancel,

            boolean fast) throws LoadLayerException, DataException {

        return getInfo(this.getMapContext().getViewPort().convertToMapPoint(p), tolerance);

    }

    @Override

    public DynObjectSet getInfo(org.gvsig.fmap.geom.primitive.Point p,

            double tolerance) throws LoadLayerException, DataException {

        int i;

        FLayer layer;

        List res = new ArrayList();

        for (i = 0; i < this.layers.size(); i++) {

            layer = (FLayer) layers.get(i);

            if (layer instanceof InfoByPoint) {

                InfoByPoint queryable_layer = (InfoByPoint) layer;

                res.add(queryable_layer.getInfo(p, tolerance));

            }

        }

        DynObjectSet[] innerSets

                = (DynObjectSet[]) res.toArray(new DynObjectSet[res.size()]);

        return new MultiDynObjectSet(innerSets);

    }