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.EditableFeature;

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

import org.gvsig.tools.dynobject.DynClass;

import org.gvsig.tools.dynobject.DynObject;

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

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

/**

 * {@link DynObject} implementation to facade a Feature and allow to be used

 * as a {@link DynObject}.

 * 

 * This implementation may be reused to be used with many {@link Feature}

 * objects, but not at the same time.

 * 

 * @author gvSIG Team

 * @version $Id$

 */

public class DynObjectFeatureFacade implements DynObject {

    private Feature feature;

    private EditableFeature editable;

    private final Object lock = new Object();

    /**

     * Empty constructor.

     */

    public DynObjectFeatureFacade() {

        // Nothing to do

    }

    /**

     * Creates a facade over a {@link Feature}.

     */

    public DynObjectFeatureFacade(Feature feature) {

        setFeatureCopy(feature);

    }

    public DynClass getDynClass() {

        return getFeature().getType();

    }

    public Object getDynValue(String name) throws DynFieldNotFoundException {

        return getFeature().get(name);

    }

    public void setDynValue(String name, Object value)

        throws DynFieldNotFoundException {

        synchronized (lock) {

            if (editable == null) {

                editable = feature.getEditable();

            }            

        }

        editable.set(name, value);

    }

    public boolean hasDynValue(String name) {

        return getFeature().get(name) != null;

    }

    public Object invokeDynMethod(String name, DynObject context)

        throws DynMethodException {

        throw new UnsupportedOperationException();

    }

    public Object invokeDynMethod(int code, DynObject context)

        throws DynMethodException {

        throw new UnsupportedOperationException();

    }

    public void implement(DynClass dynClass) {

        throw new UnsupportedOperationException();

    }

    public void delegate(DynObject dynObject) {

        throw new UnsupportedOperationException();

    }

    public void clear() {

        // Nothing to do

    }

    public Feature getFeature() {

        return editable == null ? feature : editable;

    }

    public void setFeatureCopy(Feature feature) {

        synchronized (lock) {

            this.feature = feature.getCopy();

            this.editable = null;

        }

    }

    public void setFeature(Feature feature) {

        synchronized (lock) {

            this.feature = feature;

            this.editable = null;

        }

    }

    public EditableFeature getEditable() {

        return editable;

    }

}