/*
* 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.filter;
import java.util.Iterator;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureCollectionIteration;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.PropertyDescriptor;
/**
* Run through the provided collection only returning features that pass the provided
* filter.
*
* @author Ian Schneider
*
* @source $URL$
*/
public class FilteringIteration extends FeatureCollectionIteration {
/**
* Creates a new instance of FilteringIteration
*
* @param filter DOCUMENT ME!
* @param collection DOCUMENT ME!
*/
public FilteringIteration(org.opengis.filter.Filter filter, FeatureCollection<?,?> collection) {
super(new FilterHandler(filter), collection);
}
public static void filter(FeatureCollection<?,?> features, Filter filter) {
FilteringIteration i = new FilteringIteration(filter, features);
i.iterate();
}
protected void iterate(Iterator iterator) {
((FilterHandler) handler).iterator = iterator;
super.iterate(iterator);
}
static class FilterHandler implements Handler {
Iterator<?> iterator;
final org.opengis.filter.Filter filter;
public FilterHandler(org.opengis.filter.Filter filter) {
this.filter = filter;
}
public void endFeature(Feature f) {
}
public void endFeatureCollection( FeatureCollection<?,?> fc) {
}
public void handleAttribute(PropertyDescriptor type,
Object value) {
}
public void handleFeature(Feature f) {
if (!filter.evaluate(f)) {
iterator.remove();
}
}
public void handleFeatureCollection(
FeatureCollection<?,?> fc) {
}
}
}