/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotools.data.store;

import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;

import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

import com.vividsolutions.jts.geom.Envelope;

public class EmptyFeatureCollection extends DataFeatureCollection {

	/**
	 * null bounds
	 */
	static ReferencedEnvelope bounds = new ReferencedEnvelope(new Envelope(),null);
	static {
		bounds.setToNull();
	}
	
	public EmptyFeatureCollection( SimpleFeatureType schema ) {
		super(null,schema);
	}
	
	
	public ReferencedEnvelope getBounds() {
		return bounds;
	}

	public int getCount() throws IOException {
		return 0;
	}

	protected Iterator openIterator() {
		return new EmptyIterator();
	}
	
	protected void closeIterator(Iterator close) {
		//do nothing
	}
	
	//read only access
	public boolean add(SimpleFeature object) {
		return false;
	}
	
	
	public boolean remove(Object object) {
		return false;
	}
	
	public boolean removeAll(Collection collection) {
		return false;
	}
	public boolean isValid() {
	    return true;
	}

}