org.javamoney.moneta.function.ExtractorMinorPartQuery Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of moneta-bp Show documentation

JSR 354 provides an API for representing, transporting, and performing comprehensive calculations with Money and Currency. This module implements JSR 354.

There is a newer version: 1.4.1

Show newest version

/*
  Copyright (c) 2012, 2014, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.

  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.javamoney.moneta.function;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Objects;

import javax.money.MonetaryAmount;
import javax.money.MonetaryQuery;

/**
 * This class allows to extract the minor part of a {@link MonetaryAmount}
 * instance.
 *
 * @author Anatole Tresch
 * @author Otavio Santana
 */
final class ExtractorMinorPartQuery implements MonetaryQuery {

	/**
	 * Package private constructor used from MonetaryFunctions.
	 */
	ExtractorMinorPartQuery() {
	}

	/**
	 * Extract the minor part of a {@code MonetaryAmount} with the same scale.
	 *
	 * This returns the monetary amount in terms of the minor units of the
	 * currency, truncating the whole part if necessary. For example, 'EUR 2.35'
	 * will return 35, and 'BHD -1.345' will return -345.
	 *
	 * This is returned as a {@code MonetaryAmount} rather than a
	 * {@code BigDecimal} . This is to allow further calculations to be
	 * performed on the result. Should you need a {@code BigDecimal}, simply
	 * call {@code asType(BigDecimal.class)}.
	 * @return the minor units part of the amount, never {@code null}
	 */
	@Override
	public Long queryFrom(MonetaryAmount amount) {
		Objects.requireNonNull(amount, "Amount required.");
		int fractionDigits = amount.getCurrency().getDefaultFractionDigits();
		BigDecimal number = amount.getNumber().numberValue(BigDecimal.class);
		return number.setScale(fractionDigits, RoundingMode.DOWN)
		        .remainder(BigDecimal.ONE)
		        .movePointRight(fractionDigits).longValue();
	}

}