/*
* 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.data.collection;
import java.io.IOException;
import java.util.NoSuchElementException;
import org.geotools.data.DataSourceException;
import org.geotools.data.FeatureReader;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.IllegalAttributeException;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.FeatureType;
/**
* A FeatureReader that wraps up a normal FeatureIterator.
* <p>
* This class is useful for faking (and testing) the Resource based
* API against in memory datastructures. You are warned that to
* complete the illusion that Resource based IO is occuring content
* will be duplicated.
* </p>
* @author Jody Garnett, Refractions Research, Inc.
* @source $URL$
*/
public class DelegateFeatureReader<T extends FeatureType, F extends Feature> implements FeatureReader<T, F> {
FeatureIterator<F> delegate;
T schema;
public DelegateFeatureReader( T featureType, FeatureIterator<F> features ){
this.schema = featureType;
this.delegate = features;
}
public T getFeatureType() {
return schema;
}
public F next() throws IOException, IllegalAttributeException, NoSuchElementException {
if (delegate == null) {
throw new IOException("Feature Reader has been closed");
}
try {
F feature = delegate.next();
// obj = schema.duplicate( obj );
return feature;
} catch (NoSuchElementException end) {
throw new DataSourceException("There are no more Features", end);
}
}
public boolean hasNext() throws IOException {
return delegate != null && delegate.hasNext();
}
public void close() throws IOException {
if( delegate != null ) delegate.close();
delegate = null;
schema = null;
}
}