RemoveHoleTransformer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.calcite.runtime;

import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.LinearRing;
import org.locationtech.jts.geom.Polygon;
import org.locationtech.jts.geom.util.GeometryTransformer;

/**
 * Removes the holes of a geometry.
 */
public class RemoveHoleTransformer extends GeometryTransformer {

  @Override protected Geometry transformPolygon(Polygon geom, Geometry parent) {
    if (geom == null || geom.isEmpty()) {
      return factory.createPolygon();
    }

    LinearRing exteriorRing = geom.getExteriorRing();
    if (exteriorRing == null || exteriorRing.isEmpty()) {
      return factory.createPolygon();
    }

    return factory.createPolygon(exteriorRing);
  }
}