GeometryCollectionMapper.java

/*
* 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.*;
import com.vividsolutions.jts.geom.util.GeometryMapper.MapOp;

/**
 * Maps the members of a {@link GeometryCollection}
 * into another <tt>GeometryCollection</tt> via a defined
 * mapping function.
 * 
 * @author Martin Davis
 *
 */
public class GeometryCollectionMapper 
{
  public static GeometryCollection map(GeometryCollection gc, MapOp op)
  {
    GeometryCollectionMapper mapper = new GeometryCollectionMapper(op);
    return mapper.map(gc);
  }
  
  private MapOp mapOp = null;
  
  public GeometryCollectionMapper(MapOp mapOp) {
    this.mapOp = mapOp;
  }

  public GeometryCollection map(GeometryCollection gc)
  {
    List mapped = new ArrayList();
    for (int i = 0; i < gc.getNumGeometries(); i++) {
      Geometry g = mapOp.map(gc.getGeometryN(i));
      if (!g.isEmpty())
        mapped.add(g);
    }
    return gc.getFactory().createGeometryCollection(
        GeometryFactory.toGeometryArray(mapped));
  }
}