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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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/*
 * Copyright 2014 Red Hat, Inc. and/or its affiliates.
 *
 * 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.optaplanner.examples.cheaptime.solver;

import java.math.BigDecimal;

public class CheapTimeCostCalculator {

    public static final long MICROS_PER_ONE_AS_LONG = 100000000000L;
    public static final double MICROS_PER_ONE_AS_DOUBLE = 100000000000.0;
    public static final BigDecimal MICROS_PER_ONE_AS_BIG_DECIMAL = new BigDecimal(MICROS_PER_ONE_AS_LONG);

    public static long toMicroCost(long cost) {
        return cost * MICROS_PER_ONE_AS_LONG;
    }

    public static long parseMicroCost(String costString) {
        BigDecimal costBigDecimal = new BigDecimal(costString);
        if (costBigDecimal.scale() > 11) {
            throw new IllegalArgumentException("The costString (" + costString + ") has a scale ("
                    + costBigDecimal.scale() + ") higher than 10.");
        }
        costBigDecimal = costBigDecimal.setScale(11);
        return costBigDecimal.multiply(MICROS_PER_ONE_AS_BIG_DECIMAL).longValueExact();
    }

    public static long multiplyTwoMicros(long aMicros, long bMicros) {
        // Long arithmetic overflows because maxPowerConsumption (675.4800000000) * maxPowerCost (0.0228608333)
        double aDouble = ((double) (aMicros)) / MICROS_PER_ONE_AS_DOUBLE;
        double bDouble = ((double) (bMicros)) / MICROS_PER_ONE_AS_DOUBLE;
        double result = aDouble * bDouble;
        return Math.round(result * MICROS_PER_ONE_AS_DOUBLE);
    }

    public static long divideTwoMicros(long aMicros, long bMicros) {
        double aDouble = ((double) (aMicros)) / MICROS_PER_ONE_AS_DOUBLE;
        double bDouble = ((double) (bMicros)) / MICROS_PER_ONE_AS_DOUBLE;
        double result = aDouble / bDouble;
        return Math.round(result * MICROS_PER_ONE_AS_DOUBLE);
    }

    private CheapTimeCostCalculator() {
    }

}