org.citygml4j.cityjson.util.lod.DefaultLodMapper Maven / Gradle / Ivy

Go to download
/*
 * citygml4j - The Open Source Java API for CityGML
 * https://github.com/citygml4j
 *
 * Copyright 2013-2023 Claus Nagel 
 *
 * 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.cityjson.util.lod;

import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class DefaultLodMapper implements LodMapper {
    private final Map mappings = new HashMap<>();
    private Strategy strategy = Strategy.MAXIMUM_LOD;

    public enum Strategy {
        MAXIMUM_LOD,
        MINIMUM_LOD
    }

    public DefaultLodMapper withMappingStrategy(Strategy strategy) {
        this.strategy = strategy;
        return this;
    }

    @Override
    public void buildMapping(Set lods) {
        mappings.clear();
        lods.stream()
                .sorted(strategy == Strategy.MAXIMUM_LOD ?
                        Comparator.naturalOrder() :
                        Comparator.reverseOrder())
                .forEach(lod -> mappings.put(lod.intValue(), lod));
    }

    @Override
    public double getMappingFor(int lod) {
        return mappings.getOrDefault(lod, (double) lod);
    }
}