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

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/*
  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.CurrencyUnit;
import javax.money.MonetaryAmount;
import javax.money.MonetaryOperator;

class RoudingMonetaryAmountOperator implements MonetaryOperator {

	static final RoundingMode DEFAULT_ROUDING_MONETARY_AMOUNT = RoundingMode.HALF_EVEN;

	private final RoundingMode roundingMode;

	private final Integer scaleOptional;

	public RoudingMonetaryAmountOperator() {
		this.roundingMode = DEFAULT_ROUDING_MONETARY_AMOUNT;
		scaleOptional = null;
	}

	public RoudingMonetaryAmountOperator(RoundingMode roundingMode) {
		this.roundingMode = roundingMode;
		scaleOptional = null;
	}

	public RoudingMonetaryAmountOperator(RoundingMode roundingMode, int scale) {
		this.roundingMode = roundingMode;
		this.scaleOptional = scale;

	}

	@Override
	public MonetaryAmount apply(MonetaryAmount amount) {
		Objects.requireNonNull(amount, "Amount required.");
		CurrencyUnit currency = amount.getCurrency();
		int scale = scaleOptional == null ? currency.getDefaultFractionDigits(): scaleOptional;
		BigDecimal value = amount.getNumber().numberValue(BigDecimal.class).setScale(scale, roundingMode);
		return amount.getFactory().setNumber(value).create();
	}

}