/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.geom.util;
import java.util.*;
import com.vividsolutions.jts.geom.*;
/**
* 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);
}
}