/*
* 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.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.FeatureType;
/**
* A feature iterator that completely delegates to a normal
* Iterator, simply allowing Java 1.4 code to escape the caste (sic)
* system.
* <p>
* This implementation is not suitable for use with collections
* that make use of system resources. As an alterantive please
* see ResourceFetaureIterator.
* </p>
* @author Jody Garnett, Refractions Research, Inc.
* @source $URL$
*/
public class DelegateFeatureIterator<F extends Feature> implements FeatureIterator<F> {
Iterator<F> delegate;
private FeatureCollection<? extends FeatureType, F> collection;
/**
* Wrap the provided iterator up as a FeatureIterator.
*
* @param iterator Iterator to be used as a delegate.
*/
public DelegateFeatureIterator( FeatureCollection<? extends FeatureType, F> collection, Iterator<F> iterator ){
delegate = iterator;
this.collection=collection;
}
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( collection!=null && delegate!=null)
collection.close(delegate);
collection =null;
delegate = null;
}
}