/*
* Copyright (c) 2016 Martin Davis.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.locationtech.jts.geom.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryCollection;
/**
* Methods to map various collections
* of {@link Geometry}s
* via defined mapping functions.
*
* @author Martin Davis
*
*/
public class GeometryMapper
{
/**
* Maps the members of a {@link Geometry}
* (which may be atomic or composite)
* into another <tt>Geometry</tt> of most specific type.
* <tt>null</tt> results are skipped.
* In the case of hierarchical {@link GeometryCollection}s,
* only the first level of members are mapped.
*
* @param geom the input atomic or composite geometry
* @param op the mapping operation
* @return a result collection or geometry of most specific type
*/
public static Geometry map(Geometry geom, MapOp op)
{
List mapped = new ArrayList();
for (int i = 0; i < geom.getNumGeometries(); i++) {
Geometry g = op.map(geom.getGeometryN(i));
if (g != null)
mapped.add(g);
}
return geom.getFactory().buildGeometry(mapped);
}
public static Collection map(Collection geoms, MapOp op)
{
List mapped = new ArrayList();
for (Iterator i = geoms.iterator(); i.hasNext(); ) {
Geometry g = (Geometry) i.next();
Geometry gr = op.map(g);
if (gr != null)
mapped.add(gr);
}
return mapped;
}
/**
* An interface for geometry functions used for mapping.
*
* @author Martin Davis
*
*/
public interface MapOp
{
/**
* Computes a new geometry value.
*
* @param g the input geometry
* @return a result geometry
*/
Geometry map(Geometry g);
}
}