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Java example source code file (MoneyUtils.java)

This example Java source code file (MoneyUtils.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bigmoney, money, moneyutils, nullpointerexception, string

The MoneyUtils.java Java example source code

/*
 *  Copyright 2009-present, Stephen Colebourne
 *
 *  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.joda.money;

/**
 * Utilities for working with monetary values that handle null.
 * <p>
 * This utility class contains thread-safe static methods.
 */
public final class MoneyUtils {

    /**
     * Validates that the object specified is not null.
     *
     * @param object  the object to check, not null
     * @throws NullPointerException if the input value is null
     */
    static void checkNotNull(Object object, String message) {
        if (object == null) {
            throw new NullPointerException(message);
        }
    }

    //-----------------------------------------------------------------------
    /**
     * Private constructor.
     */
    private MoneyUtils() {
    }

    //-----------------------------------------------------------------------
    /**
     * Checks if the monetary value is zero, treating null as zero.
     * <p>
     * This method accepts any implementation of {@code BigMoneyProvider}.
     * 
     * @param moneyProvider  the money to check, null returns zero
     * @return true if the money is null or zero
     */
    public static boolean isZero(BigMoneyProvider moneyProvider) {
        return (moneyProvider == null || moneyProvider.toBigMoney().isZero());
    }

    /**
     * Checks if the monetary value is positive and non-zero, treating null as zero.
     * <p>
     * This method accepts any implementation of {@code BigMoneyProvider}.
     * 
     * @param moneyProvider  the money to check, null returns false
     * @return true if the money is non-null and positive
     */
    public static boolean isPositive(BigMoneyProvider moneyProvider) {
        return (moneyProvider != null && moneyProvider.toBigMoney().isPositive());
    }

    /**
     * Checks if the monetary value is positive or zero, treating null as zero.
     * <p>
     * This method accepts any implementation of {@code BigMoneyProvider}.
     * 
     * @param moneyProvider  the money to check, null returns true
     * @return true if the money is null, zero or positive
     */
    public static boolean isPositiveOrZero(BigMoneyProvider moneyProvider) {
        return (moneyProvider == null || moneyProvider.toBigMoney().isPositiveOrZero());
    }

    /**
     * Checks if the monetary value is negative and non-zero, treating null as zero.
     * <p>
     * This method accepts any implementation of {@code BigMoneyProvider}.
     * 
     * @param moneyProvider  the money to check, null returns false
     * @return true if the money is non-null and negative
     */
    public static boolean isNegative(BigMoneyProvider moneyProvider) {
        return (moneyProvider != null && moneyProvider.toBigMoney().isNegative());
    }

    /**
     * Checks if the monetary value is negative or zero, treating null as zero.
     * <p>
     * This method accepts any implementation of {@code BigMoneyProvider}.
     * 
     * @param moneyProvider  the money to check, null returns true
     * @return true if the money is null, zero or negative
     */
    public static boolean isNegativeOrZero(BigMoneyProvider moneyProvider) {
        return (moneyProvider == null || moneyProvider.toBigMoney().isNegativeOrZero());
    }

    //-----------------------------------------------------------------------
    /**
     * Finds the maximum {@code Money} value, handing null.
     * <p>
     * This returns the greater of money1 or money2 where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null returns money2
     * @param money2  the first money instance, null returns money1
     * @return the maximum value, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static Money max(Money money1, Money money2) {
        if (money1 == null) {
            return money2;
        }
        if (money2 == null) {
            return money1;
        }
        return money1.compareTo(money2) > 0 ? money1 : money2;
    }

    /**
     * Finds the minimum {@code Money} value, handing null.
     * <p>
     * This returns the greater of money1 or money2 where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null returns money2
     * @param money2  the first money instance, null returns money1
     * @return the minimum value, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static Money min(Money money1, Money money2) {
        if (money1 == null) {
            return money2;
        }
        if (money2 == null) {
            return money1;
        }
        return money1.compareTo(money2) < 0 ? money1 : money2;
    }

    //-----------------------------------------------------------------------
    /**
     * Adds two {@code Money} objects, handling null.
     * <p>
     * This returns {@code money1 + money2} where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null returns money2
     * @param money2  the first money instance, null returns money1
     * @return the total, where null is ignored, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static Money add(Money money1, Money money2) {
        if (money1 == null) {
            return money2;
        }
        if (money2 == null) {
            return money1;
        }
        return money1.plus(money2);
    }

    //-----------------------------------------------------------------------
    /**
     * Subtracts the second {@code Money} from the first, handling null.
     * <p>
     * This returns {@code money1 - money2} where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null treated as zero
     * @param money2  the first money instance, null returns money1
     * @return the total, where null is ignored, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static Money subtract(Money money1, Money money2) {
        if (money2 == null) {
            return money1;
        }
        if (money1 == null) {
            return money2.negated();
        }
        return money1.minus(money2);
    }

    //-----------------------------------------------------------------------
    /**
     * Finds the maximum {@code BigMoney} value, handing null.
     * <p>
     * This returns the greater of money1 or money2 where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null returns money2
     * @param money2  the first money instance, null returns money1
     * @return the maximum value, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static BigMoney max(BigMoney money1, BigMoney money2) {
        if (money1 == null) {
            return money2;
        }
        if (money2 == null) {
            return money1;
        }
        return money1.compareTo(money2) > 0 ? money1 : money2;
    }

    /**
     * Finds the minimum {@code BigMoney} value, handing null.
     * <p>
     * This returns the greater of money1 or money2 where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null returns money2
     * @param money2  the first money instance, null returns money1
     * @return the minimum value, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static BigMoney min(BigMoney money1, BigMoney money2) {
        if (money1 == null) {
            return money2;
        }
        if (money2 == null) {
            return money1;
        }
        return money1.compareTo(money2) < 0 ? money1 : money2;
    }

    //-----------------------------------------------------------------------
    /**
     * Adds two {@code BigMoney} objects, handling null.
     * <p>
     * This returns {@code money1 + money2} where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null returns money2
     * @param money2  the first money instance, null returns money1
     * @return the total, where null is ignored, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static BigMoney add(BigMoney money1, BigMoney money2) {
        if (money1 == null) {
            return money2;
        }
        if (money2 == null) {
            return money1;
        }
        return money1.plus(money2);
    }

    //-----------------------------------------------------------------------
    /**
     * Subtracts the second {@code BigMoney} from the first, handling null.
     * <p>
     * This returns {@code money1 - money2} where null is ignored.
     * If both input values are null, then null is returned.
     * 
     * @param money1  the first money instance, null treated as zero
     * @param money2  the first money instance, null returns money1
     * @return the total, where null is ignored, null if both inputs are null
     * @throws CurrencyMismatchException if the currencies differ
     */
    public static BigMoney subtract(BigMoney money1, BigMoney money2) {
        if (money2 == null) {
            return money1;
        }
        if (money1 == null) {
            return money2.negated();
        }
        return money1.minus(money2);
    }

}

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