/*
* 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.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.geotools.data.DataUtilities;
import org.geotools.data.FeatureReader;
import org.geotools.data.collection.DelegateFeatureReader;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.collection.DecoratingFeatureCollection;
import org.geotools.feature.collection.DelegateFeatureIterator;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.FeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.sort.SortBy;
/**
* FeatureCollection<SimpleFeatureType, SimpleFeature> wrapper which limits the number of features returned.
*
* @author Justin Deoliveira, The Open Planning Project
*
*
* @source $URL$
*/
public class MaxFeaturesFeatureCollection<T extends FeatureType, F extends Feature> extends
DecoratingFeatureCollection<T, F> {
FeatureCollection<T, F> delegate;
long max;
public MaxFeaturesFeatureCollection( FeatureCollection<T, F> delegate, long max ) {
super(delegate);
this.delegate = delegate;
this.max = max;
}
public FeatureReader<T, F> reader() throws IOException {
return new DelegateFeatureReader<T, F>( getSchema(), features() );
}
public FeatureIterator<F> features() {
return new DelegateFeatureIterator<F>( this, iterator() );
}
public void close(FeatureIterator<F> close) {
close.close();
}
public Iterator<F> iterator() {
return new MaxFeaturesIterator<F>( delegate.iterator(), max );
}
public void close(Iterator<F> close) {
Iterator<F> iterator = ((MaxFeaturesIterator<F>)close).getDelegate();
delegate.close( iterator );
}
public FeatureCollection<T, F> subCollection(Filter filter) {
throw new UnsupportedOperationException();
}
public FeatureCollection<T, F> sort(SortBy order) {
throw new UnsupportedOperationException();
}
public int size() {
return (int) Math.min( delegate.size(), max );
}
public boolean isEmpty() {
return delegate.isEmpty() || max == 0;
}
public Object[] toArray() {
return toArray( new Object[ size() ] );
}
public Object[] toArray(Object[] a) {
List list = new ArrayList();
Iterator i = iterator();
try {
while( i.hasNext() ) {
list.add( i.next() );
}
return list.toArray( a );
}
finally {
close( i );
}
}
public boolean add(F o) {
long size = delegate.size();
if ( size < max ) {
return delegate.add( o );
}
return false;
}
public boolean addAll(Collection c) {
boolean changed = false;
for ( Iterator<F> i = c.iterator(); i.hasNext(); ) {
changed = changed | add( i.next() );
}
return changed;
}
public boolean containsAll(Collection c) {
for ( Iterator i = c.iterator(); i.hasNext(); ) {
if ( !contains( i.next() ) ) {
return false;
}
}
return true;
}
public ReferencedEnvelope getBounds() {
//calculate manually
return ReferencedEnvelope.reference( DataUtilities.bounds( this ) );
}
}