Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * 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 2

 * 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.

 *

 */

package org.gvsig.fmap.dal.feature.impl.featureset;

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

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

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

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

import org.gvsig.tools.dispose.DisposableIterator;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.dynobject.DynObjectSet;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.observer.Observable;

import org.gvsig.tools.observer.Observer;

import org.gvsig.tools.observer.impl.BaseWeakReferencingObservable;

import org.gvsig.tools.visitor.VisitCanceledException;

import org.gvsig.tools.visitor.Visitor;

/**

 * {@link DynObject} implementation to facade of a {@link FeatureSet} and allow

 * to be used as a {@link DynObjectSet}.

 * 

 * @author gvSIG Team

 * @version $Id$

 */

public class DynObjectSetFeatureSetFacade extends BaseWeakReferencingObservable

    implements DynObjectSet, Observer {

    private final FeatureSet featureSet;

    private final FeatureStore store;

    private final DynObjectFeatureFacade featureFacade =

        new DynObjectFeatureFacade();

    private final boolean fast;

    /**

     * Creates a new facade over a given feature set, with fast dynobject

     * iteration.

     * 

     * @param featureSet

     *            to facade

     */

    public DynObjectSetFeatureSetFacade(FeatureSet featureSet,

        FeatureStore store) {

        this(featureSet, store, true);

    }

    /**

     * Creates a new facade over a given feature set, with fast dynobject

     * iteration.

     * 

     * @param featureSet

     *            to facade

     * @param fast

     *            if true try to reuse objects as much as possible to make the

     *            object iteration faster. If true, DynObjects got through the

     *            returned set must not be stored unless cloned.

     */

    public DynObjectSetFeatureSetFacade(FeatureSet featureSet,

        FeatureStore store, boolean fast) {

        this.featureSet = featureSet;

        this.store = store;

        store.addObserver(this);

        this.fast = fast;

    }

    public void dispose() {

        store.deleteObserver(this);

    }

    public void accept(final Visitor visitor, long firstValueIndex)

        throws BaseException {

        featureSet.accept(new Visitor() {

            public void visit(Object obj) throws VisitCanceledException,

                BaseException {

                DynObjectFeatureFacade feature;

                if (fast) {

                    feature = featureFacade;

                } else {

                    feature = new DynObjectFeatureFacade();

                }

                feature.setFeatureCopy((Feature) obj);

                visitor.visit(feature);

            }

        }, firstValueIndex);

    }

    public void accept(final Visitor visitor) throws BaseException {

        featureSet.accept(new Visitor() {

            public void visit(Object obj) throws VisitCanceledException,

                BaseException {

                featureFacade.setFeatureCopy((Feature) obj);

                visitor.visit(featureFacade);

            }

        });

    }

    public long getSize() throws BaseException {

        return featureSet.getSize();

    }

    public DisposableIterator iterator(long index) throws BaseException {

        if (fast) {

            return new DynObjectIteratorFeatureIteratorFacade(

                featureSet.fastIterator(index), featureFacade);

        } else {

            return new DynObjectIteratorFeatureIteratorFacade(

                featureSet.fastIterator(index));

        }

    }

    public DisposableIterator iterator() throws BaseException {

        if (fast) {

            return new DynObjectIteratorFeatureIteratorFacade(

                featureSet.fastIterator(), featureFacade);

        } else {

            return new DynObjectIteratorFeatureIteratorFacade(

                featureSet.fastIterator());

        }

    }

    public boolean isEmpty() throws BaseException {

        return featureSet.isEmpty();

    }

    public boolean isDeleteEnabled() {

        return store.isEditing();

    }

    public void delete(DynObject dynObject) throws BaseException {

        DynObjectFeatureFacade facade = (DynObjectFeatureFacade) dynObject;

        featureSet.delete(facade.getFeature());

    }

    public boolean isUpdateEnabled() {

        return store.isEditing();

    }

    public void update(DynObject dynObject) throws BaseException {

        DynObjectFeatureFacade facade = (DynObjectFeatureFacade) dynObject;

        featureSet.update(facade.getEditable());

    }

    public void update(Observable observable, Object notification) {

        if (observable.equals(store)

            && notification instanceof FeatureStoreNotification) {

            FeatureStoreNotification event =

                (FeatureStoreNotification) notification;

            if (event.getType() == FeatureStoreNotification.AFTER_STARTEDITING

                || event.getType() == FeatureStoreNotification.AFTER_FINISHEDITING

                || event.getType() == FeatureStoreNotification.AFTER_CANCELEDITING) {

                setChanged();

                notify(this, new Notification() {

                    public String getType() {

                        return Notification.EDITION_STATUS_CHANGE;

                    }

                });

            }

        }

    }

}