text: /**********************************************************************
   *
   * GEOS - Geometry Engine Open Source
   * http://geos.osgeo.org
   *
   * Copyright (C) 2005-2006 Refractions Research Inc.
   * Copyright (C) 2001-2002 Vivid Solutions Inc.
   *
   * This is free software; you can redistribute and/or modify it under
   * the terms of the GNU Lesser General Public Licence as published
   * by the Free Software Foundation.
   * See the COPYING file for more information.
   *
   **********************************************************************
   *
   * Last port: linearref/ExtractLineByLocation.java rev. 1.10
   *
   **********************************************************************/
  
  #ifndef GEOS_LINEARREF_EXTRACTLINEBYLOCATION_H
  #define GEOS_LINEARREF_EXTRACTLINEBYLOCATION_H
  
  #include <geos/geom/Coordinate.h>
  #include <geos/geom/Geometry.h>
  #include <geos/linearref/LinearLocation.h>
  
  namespace geos
  {
  namespace linearref   // geos::linearref
  {
  
  /**
   * Extracts the subline of a linear {@link Geometry} between
   * two {@link LinearLocation}s on the line.
   */
  class ExtractLineByLocation
  {
  
  private:
  	const geom::Geometry *line;
  	geom::Geometry *reverse(const geom::Geometry *linear);
  
  	/**
  	 * Assumes input is valid (e.g. start <= end)
  	 *
  	 * @param start
  	 * @param end
  	 * @return a linear geometry
  	 */
  	geom::LineString* computeLine(const LinearLocation& start, const LinearLocation& end);
  
  	/**
  	 * Assumes input is valid (e.g. start <= end)
  	 *
  	 * @param start
  	 * @param end
  	 * @return a linear geometry
  	 */
  	geom::Geometry *computeLinear(const LinearLocation& start, const LinearLocation& end);
  
  public:
  	/**
  	 * Computes the subline of a {@link LineString} between
  	 * two {@link LineStringLocation}s on the line.
  	 * If the start location is after the end location,
  	 * the computed geometry is reversed.
  	 *
  	 * @param line the line to use as the baseline
  	 * @param start the start location
  	 * @param end the end location
  	 * @return the extracted subline
  	 */
  	static geom::Geometry *extract(const geom::Geometry *line, const LinearLocation& start, const LinearLocation& end);
  
  	ExtractLineByLocation(const geom::Geometry *line);
  
  	/**
  	 * Extracts a subline of the input.
  	 * If <code>end < start</code> the linear geometry computed will be reversed.
  	 *
  	 * @param start the start location
  	 * @param end the end location
  	 * @return a linear geometry
  	 */
  	geom::Geometry *extract(const LinearLocation& start, const LinearLocation& end);
  
  };
  }
  }
  #endif
  