/*
* 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.visitor;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.opengis.feature.FeatureVisitor;
import org.opengis.feature.simple.SimpleFeature;
/**
* DOCUMENT ME!
*
* @author Cory Horner, Refractions
*
* @since 2.2.M2
*
*
* @source $URL$
*/
public class CollectionUtil {
/**
* Navigate the collection and call vistor.visit( Feature ) for each
* element in the collection.
*
* @param collection the SimpleFeatureCollection containing the features we want to visit
* @param visitor the visitor which already knows which attributes it wants to meet
*/
static void accept(SimpleFeatureCollection collection, FeatureVisitor visitor) {
SimpleFeatureIterator iterator = collection.features();
try {
while( iterator.hasNext()) {
SimpleFeature feature = (SimpleFeature) iterator.next();
visitor.visit(feature);
}
}
finally {
iterator.close();
}
}
static void accept(SimpleFeatureCollection collection, FeatureVisitor[] visitors) {
SimpleFeatureIterator iterator = collection.features();
try {
while( iterator.hasNext()) {
SimpleFeature feature = (SimpleFeature) iterator.next();
for (int i = 0; i < visitors.length; i++) {
FeatureVisitor visitor = visitors[i];
visitor.visit(feature);
}
}
} finally {
iterator.close();
}
}
public static Object calc(SimpleFeatureCollection collection,
FeatureCalc calculator) {
accept(collection, calculator);
return calculator.getResult();
}
}