code: /*
   * citygml-tools - Collection of tools for processing CityGML files
   * https://github.com/citygml4j/citygml-tools
   *
   * citygml-tools is part of the citygml4j project
   *
   * Copyright 2018-2023 Claus Nagel <claus.nagel@gmail.com>
   *
   * 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 org.citygml4j.tools.util;
  
  import org.citygml4j.cityjson.util.lod.DefaultLodMapper;
  
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  
  public class LodMapper implements org.citygml4j.cityjson.util.lod.LodMapper {
      private final DefaultLodMapper lodMapper = new DefaultLodMapper();
      private Map<Integer, Double> mappings;
      private Set<Double> lods;
  
      public enum Mode {
          MAXIMUM,
          MINIMUM;
  
          @Override
          public String toString() {
              return name().toLowerCase(Locale.ROOT);
          }
      }
  
      private LodMapper() {
      }
  
      public static LodMapper newInstance() {
          return new LodMapper();
      }
  
      public LodMapper withMode(Mode mode) {
          lodMapper.withMappingStrategy(mode == Mode.MINIMUM ?
                  DefaultLodMapper.Strategy.MINIMUM_LOD :
                  DefaultLodMapper.Strategy.MAXIMUM_LOD);
          return this;
      }
  
      public LodMapper withMapping(Map<Integer, Double> mappings) {
          this.mappings = mappings;
          return this;
      }
  
      @Override
      public void buildMapping(Set<Double> lods) {
          this.lods = lods;
          lodMapper.buildMapping(lods);
      }
  
      @Override
      public double getMappingFor(int lod) {
          if (mappings == null) {
              return lodMapper.getMappingFor(lod);
          } else {
              double mapping = mappings.getOrDefault(lod, -Double.MAX_VALUE);
              return lods.contains(mapping) ?
                      mapping :
                      lodMapper.getMappingFor(lod);
          }
      }
  }
  