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/*
* 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.index.strtree;

import com.vividsolutions.jts.geom.Geometry;

/**
 * An ItemDistance function for 
 * items which are {@link Geometry}s,
 * using the {@link Geometry#distance(Geometry)} method.
 * 
 * @author Martin Davis
 *
 */
public class GeometryItemDistance
implements ItemDistance
{
  /**
   * Computes the distance between two {@link Geometry} items,
   * using the {@link Geometry#distance(Geometry)} method.
   * 
   * @param item1 an item which is a Geometry
   * @param item2 an item which is a Geometry
   * @return the distance between the geometries
   * @throws ClassCastException if either item is not a Geometry
   */
  public double distance(ItemBoundable item1, ItemBoundable item2) {
    Geometry g1 = (Geometry) item1.getItem();
    Geometry g2 = (Geometry) item2.getItem();
    return g1.distance(g2);    
  }
}