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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.
/*
* 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);
}
}