Java tutorial
/* * 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.kylin.cube.cuboid.algorithm.generic; import com.google.common.collect.ImmutableSet; import com.google.common.collect.Sets; import org.apache.commons.math3.genetics.Chromosome; import org.apache.kylin.cube.cuboid.algorithm.BenefitPolicy; import org.apache.kylin.cube.cuboid.algorithm.CuboidBenefitModel; import java.util.BitSet; public class BitsChromosome extends Chromosome { /** * Global unmodified */ private final BitsChromosomeHelper helper; /** * BitSet representing the chromosome */ private final BitSet representation; private final ImmutableSet<Long> cuboids; private final BenefitPolicy benefitPolicy; private final double spaceCost; public BitsChromosome(final BitSet representation, final BenefitPolicy benefitPolicy, BitsChromosomeHelper helper) { this.helper = helper; this.representation = representation; this.cuboids = ImmutableSet.copyOf(helper.toCuboidList(representation)); this.benefitPolicy = benefitPolicy; this.spaceCost = helper.getCuboidSize(Sets.newHashSet(cuboids)); } public BitsChromosome newBitsChromosome(BitSet newRepresentation) { return new BitsChromosome(newRepresentation, benefitPolicy.getInstance(), helper); } public BitSet getRepresentation() { return representation; } /** * Returns the length of the chromosome. * * @return the length of the chromosome */ public int getLength() { return helper.getLength(); } public ImmutableSet<Long> getCuboids() { return cuboids; } @Override public synchronized double fitness() { CuboidBenefitModel.BenefitModel benefitModel = benefitPolicy.calculateBenefitTotal(cuboids, helper.getMandatoryCuboids()); double totalBenefit = benefitModel.benefit; if (spaceCost > helper.spaceLimit) { totalBenefit = totalBenefit * helper.spaceLimit / spaceCost; } return totalBenefit; } @Override protected boolean isSame(final Chromosome another) { return this.equals(another); } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; BitsChromosome that = (BitsChromosome) o; if (helper != null ? !helper.equals(that.helper) : that.helper != null) return false; return representation != null ? representation.equals(that.representation) : that.representation == null; } @Override public int hashCode() { int result = helper != null ? helper.hashCode() : 0; result = 31 * result + (representation != null ? representation.hashCode() : 0); return result; } }