DecoratingFeatureIterator.java

/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2005-2008, 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.feature.collection;

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.opengis.feature.Feature;
import org.opengis.feature.type.FeatureType;

/**
 * A feature iterator that completely delegates to another FeatureIterator.
 * 
 * @author Jody Garnett
 *
 *
 * @source $URL$
 */
public class DecoratingFeatureIterator<F extends Feature> implements FeatureIterator<F> {
	FeatureIterator<F> delegate;
	
	/**
	 * Wrap the provided FeatureIterator.
	 * 
	 * @param iterator Iterator to be used as a delegate.
	 */
	public DecoratingFeatureIterator( FeatureIterator<F> iterator ){
		delegate = iterator;
	}

	public boolean hasNext() {
		return delegate != null && delegate.hasNext();
	}
	
	public F next() throws NoSuchElementException {
		if( delegate == null ) throw new NoSuchElementException();
		return  delegate.next();
	}
	
	public void close() {
		if( delegate!=null ){
			delegate.close();
		}
		delegate = null;		
	}
}