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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    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.io.Closeable;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.geotools.data.DataUtilities;
import org.geotools.feature.FeatureIterator;
import org.opengis.feature.Feature;

/**
 * A feature iterator that completely delegates to a normal Iterator, simply allowing Java 1.4 code
 * to escape the caste (sic) system.
 *
 * This implementation checks the iterator to see if it implements {@link Closeable} in order to
 * allow for collections that make use of system resources.
 *
 * @author Jody Garnett, Refractions Research, Inc.
 */
public class DelegateFeatureIterator implements FeatureIterator {
    Iterator delegate;
    /**
     * Wrap the provided iterator up as a FeatureIterator.
     *
     * @param iterator Iterator to be used as a delegate.
     */
    public DelegateFeatureIterator(Iterator 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() {
        DataUtilities.close(delegate);
        delegate = null;
    }
}