TopologyPreservingSimplifierStabilityTest.java

/*
 * Copyright (c) 2016 Vivid Solutions.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
 * and the Eclipse Distribution License is available at
 *
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */
package test.jts.perf.simplify;

import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.io.WKTReader;
import org.locationtech.jts.simplify.TopologyPreservingSimplifier;

/**
 * Tests if TopologyPreservingSimplifier results are stable
 * over repeated calls with different instances of an identical MultiLineString.
 * 
 * This was a bug in GEOS, since the order of simplification depended on the 
 * (unstable) address of the geometry components.
 * (See https://github.com/libgeos/geos/pull/718).
 * 
 * It appears JTS is stable as it stands.
 * Although this is 
 * suspicious, since the order of HashMap would seem to be unstable?
 * 
 * @author mdavis
 *
 */
public class TopologyPreservingSimplifierStabilityTest {
  public static void main(String args[]) {
    try {
      (new TopologyPreservingSimplifierStabilityTest()).run();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  // repro case from GEOS bug report
  String wkt = 
"MULTILINESTRING((159612.02323361888 6284563.8677484,159743.35796885678 6284436.870843225,159804.50576514952 6284376.057057197,159943.10966313622 6284232.942543113,160062.97849082242 6284104.710601479,"
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      ;
  
  private void run() {
    double prevLen = -1;
    for (int i = 0; i < 1000; i++) {
      double len = simplify();
      System.out.println("len: " + len);
      if (prevLen >= 0 && len != prevLen) {
        System.out.println("Found diff in len: " + len);
        throw new IllegalStateException("Found diff in len: " + len);
      }
      prevLen = len;
    }
    
  }

  private double simplify() {
    Geometry geom = read(wkt);
    Geometry simp = TopologyPreservingSimplifier.simplify(geom, 1222);
    double simpLen = simp.getLength();
    return simpLen;
  }

  private static Geometry read(String wkt) {
    WKTReader rdr = new WKTReader();
    try {
      return rdr.read(wkt);
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
    return null;
  }
}
Created with JaCoCo 0.8.7.202105040129