DrawEditorFeatureControl.java

/**
 * geo-platform
 * Rich webgis framework
 * http://geo-platform.org
 * ====================================================================
 * <p>
 * Copyright (C) 2008-2017 geoSDI Group (CNR IMAA - Potenza - ITALY).
 * <p>
 * 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, see http://www.gnu.org/licenses/
 * <p>
 * ====================================================================
 * <p>
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library. Thus, the terms and
 * conditions of the GNU General Public License cover the whole combination.
 * <p>
 * As a special exception, the copyright holders of this library give you permission
 * to link this library with independent modules to produce an executable, regardless
 * of the license terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided that you also meet,
 * for each linked independent module, the terms and conditions of the license of
 * that module. An independent module is a module which is not derived from or
 * based on this library. If you modify this library, you may extend this exception
 * to your version of the library, but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version.
 */
package org.geosdi.geoplatform.gui.client.editor.map.control;

import org.geosdi.geoplatform.gui.impl.map.control.GPVectorMapControl;
import org.gwtopenmaps.openlayers.client.control.DrawFeature;
import org.gwtopenmaps.openlayers.client.control.DrawFeatureOptions;
import org.gwtopenmaps.openlayers.client.feature.VectorFeature;
import org.gwtopenmaps.openlayers.client.handler.Handler;
import org.gwtopenmaps.openlayers.client.layer.Vector;

/**
 * @author Giuseppe La Scaleia - CNR IMAA geoSDI Group
 * @email giuseppe.lascaleia@geosdi.org
 */
public abstract class DrawEditorFeatureControl extends GPVectorMapControl {

    protected DrawFeature drawEditorControl;

    public DrawEditorFeatureControl(Vector vector, boolean lazy) {
        super(vector, lazy);
    }

    @Override
    protected DrawFeature initializeMapControl() {
        this.createControl();
        return this.drawEditorControl;
    }

    protected final DrawFeature.FeatureAddedListener createFeatureAddedListener() {
        return new DrawFeature.FeatureAddedListener() {

            @Override
            public void onFeatureAdded(VectorFeature vf) {
                manageAddedFeature(vf);
            }

        };
    }

    @Override
    public void createControl() {
        if (!initialized) {
            DrawFeatureOptions drawLineFeatureOption = new DrawFeatureOptions();
            drawLineFeatureOption.onFeatureAdded(this.createFeatureAddedListener());
            this.drawEditorControl = new DrawFeature(vector, buildHandler(), drawLineFeatureOption);
            initialized = true;
        }
    }

    @Override
    public DrawFeature getControl() {
        return (this.drawEditorControl != null) ? this.drawEditorControl
                : initializeMapControl();
    }

    @Override
    public void activateControl() {
        this.drawEditorControl.activate();
    }

    @Override
    public void deactivateControl() {
        this.drawEditorControl.deactivate();
    }

    @Override
    public boolean isEnabled() {
        return this.drawEditorControl.isActive();
    }

    /**
     * @param <H>
     * @return {@link H}
     */
    protected abstract <H extends Handler> H buildHandler();

    /**
     * <p>This method must be implemented by all Sub Classes.</>
     *
     * @param vf
     */
    protected abstract void manageAddedFeature(VectorFeature vf);

}