com.vividsolutions.jts.geom.prep.PreparedLineString Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of JTSplus Show documentation

JTS Topology Suite 1.14 with additional functions for GeoSpark

There is a newer version: 0.1.4

/*
 * 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.prep;

import com.vividsolutions.jts.geom.*;
import com.vividsolutions.jts.noding.*;

/**
 * A prepared version for {@link Lineal} geometries.
 * 
 * Instances of this class are thread-safe.
 * 
 * @author mbdavis
 *
 */
public class PreparedLineString
  extends BasicPreparedGeometry
{
  private FastSegmentSetIntersectionFinder segIntFinder = null;

  public PreparedLineString(Lineal line) {
    super((Geometry) line);
  }

  public synchronized FastSegmentSetIntersectionFinder getIntersectionFinder()
  {
  	/**
  	 * MD - Another option would be to use a simple scan for 
  	 * segment testing for small geometries.  
  	 * However, testing indicates that there is no particular advantage 
  	 * to this approach.
  	 */
  	if (segIntFinder == null)
  		segIntFinder = new FastSegmentSetIntersectionFinder(SegmentStringUtil.extractSegmentStrings(getGeometry()));
    return segIntFinder;
  }
  
  public boolean intersects(Geometry g)
  {
  	if (! envelopesIntersect(g)) return false;
    return PreparedLineStringIntersects.intersects(this, g);
  }
  
  /**
   * There's not much point in trying to optimize contains, since 
   * contains for linear targets requires the entire test geometry 
   * to exactly match the target linework.
   */
}