code: /*
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.esri.core.geometry;
  
  import org.junit.Test;
  
  import static com.esri.core.geometry.ogc.OGCGeometry.fromText;
  import static java.lang.String.format;
  import static org.junit.Assert.assertEquals;
  
  public class TestOGCDistance
  {
      @Test
      public void testPoint()
      {
          assertDistance("POINT (1 2)", "POINT (2 2)", 1);
          assertDistance("POINT (1 2)", "POINT (1 2)", 0);
          assertNanDistance("POINT (1 2)", "POINT EMPTY");
  
          assertDistance(gc("POINT (1 2)"), "POINT (2 2)", 1);
          assertDistance(gc("POINT (1 2)"), "POINT (1 2)", 0);
          assertNanDistance(gc("POINT (1 2)"), "POINT EMPTY");
          assertDistance(gc("POINT (1 2)"), gc("POINT (2 2)"), 1);
  
          assertDistance("MULTIPOINT (1 0, 2 0, 3 0)", "POINT (2 1)", 1);
          assertDistance(gc("MULTIPOINT (1 0, 2 0, 3 0)"), "POINT (2 1)", 1);
          assertDistance(gc("POINT (1 0), POINT (2 0), POINT (3 0))"), "POINT (2 1)", 1);
  
          assertDistance(gc("POINT (1 0), POINT EMPTY"), "POINT (2 0)", 1);
      }
  
      private void assertDistance(String wkt, String otherWkt, double distance)
      {
          assertEquals(distance, fromText(wkt).distance(fromText(otherWkt)), 0.000001);
          assertEquals(distance, fromText(otherWkt).distance(fromText(wkt)), 0.000001);
      }
  
      private void assertNanDistance(String wkt, String otherWkt)
      {
          assertEquals(Double.NaN, fromText(wkt).distance(fromText(otherWkt)), 0.000001);
          assertEquals(Double.NaN, fromText(otherWkt).distance(fromText(wkt)), 0.000001);
      }
  
      private String gc(String wkts)
      {
          return format("GEOMETRYCOLLECTION (%s)", wkts);
      }
  }
  