org.drools.planner.core.score.buildin.simpledouble.DefaultSimpleDoubleScore Maven / Gradle / Ivy

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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule engine powered score calculation. This is the drools-planner-core module which contains metaheuristic algorithms.

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/*
 * Copyright 2011 JBoss Inc
 *
 * 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.drools.planner.core.score.buildin.simpledouble;

import org.drools.planner.core.score.AbstractScore;

/**
 * Default implementation of {@link SimpleDoubleScore}.
 * 
 * This class is immutable.
 * @see SimpleDoubleScore
 */
public final class DefaultSimpleDoubleScore extends AbstractScore
        implements SimpleDoubleScore {

    public static DefaultSimpleDoubleScore parseScore(String scoreString) {
        return valueOf(Double.parseDouble(scoreString));
    }

    public static DefaultSimpleDoubleScore valueOf(double score) {
        return new DefaultSimpleDoubleScore(score);
    }

    private final double score;

    public DefaultSimpleDoubleScore(double score) {
        this.score = score;
    }

    public double getScore() {
        return score;
    }

    // ************************************************************************
    // Worker methods
    // ************************************************************************

    public SimpleDoubleScore add(SimpleDoubleScore augment) {
        return new DefaultSimpleDoubleScore(score + augment.getScore());
    }

    public SimpleDoubleScore subtract(SimpleDoubleScore subtrahend) {
        return new DefaultSimpleDoubleScore(score - subtrahend.getScore());
    }

    public SimpleDoubleScore multiply(double multiplicand) {
        return new DefaultSimpleDoubleScore(Math.floor(score * multiplicand));
    }

    public SimpleDoubleScore divide(double divisor) {
        return new DefaultSimpleDoubleScore(Math.floor(score / divisor));
    }

    public double[] toDoubleArray() {
        return new double[]{score};
    }

    public boolean equals(Object o) {
        // A direct implementation (instead of EqualsBuilder) to avoid dependencies
        if (this == o) {
            return true;
        } else if (o instanceof SimpleDoubleScore) {
            SimpleDoubleScore other = (SimpleDoubleScore) o;
            return score == other.getScore();
        } else {
            return false;
        }
    }

    public int hashCode() {
        // A direct implementation (instead of HashCodeBuilder) to avoid dependencies
        return (17 * 37) + Double.valueOf(score).hashCode();
    }

    public int compareTo(SimpleDoubleScore other) {
        // A direct implementation (instead of CompareToBuilder) to avoid dependencies
        if (score < other.getScore()) {
            return -1;
        } else if (score > other.getScore()) {
            return 1;
        } else {
            return 0;
        }
    }

    public String toString() {
        return Double.toString(score);
    }

}