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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 2015 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.investment.domain.util;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.NumberFormat;

public class InvestmentNumericUtil {

    public static final long MAXIMUM_QUANTITY_MILLIS = 1000L;

    public static final String MILLIS_NUMBER_PATTERN = "#0.000";
    public static final String MILLIS_PERCENT_PATTERN = "#0.0%";
    // TODO Remove potential multithreaded use of a thread-unsafe class
    protected static final NumberFormat MILLIS_NUMBER_FORMAT = new DecimalFormat(MILLIS_NUMBER_PATTERN);
    protected static final NumberFormat MILLIS_PERCENT_FORMAT = new DecimalFormat(MILLIS_PERCENT_PATTERN);

    protected static final BigDecimal MILLIS_DIVISOR = new BigDecimal(1000L);
    protected static final BigDecimal MICROS_DIVISOR = new BigDecimal(1000000L);

    public static String formatMillisAsNumber(long millis) {
        BigDecimal value = new BigDecimal(millis).divide(MILLIS_DIVISOR, 3, BigDecimal.ROUND_HALF_UP);
        return MILLIS_NUMBER_FORMAT.format(value);
    }

    public static String formatMillisAsPercentage(long millis) {
        BigDecimal value = new BigDecimal(millis).divide(MILLIS_DIVISOR, 3, BigDecimal.ROUND_HALF_UP);
        return MILLIS_PERCENT_FORMAT.format(value);
    }

    public static String formatMicrosAsPercentage(long micros) {
        BigDecimal value = new BigDecimal(micros).divide(MICROS_DIVISOR, 6, BigDecimal.ROUND_HALF_UP);
        return MILLIS_PERCENT_FORMAT.format(value);
    }

    private InvestmentNumericUtil() {
    }

}