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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.convert;

import java.util.Objects;

import javax.money.CurrencyUnit;
import javax.money.MonetaryAmount;
import javax.money.convert.CurrencyConversion;
import javax.money.convert.ExchangeRateProvider;

import org.javamoney.moneta.function.DefaultMonetarySummaryStatistics;
import org.javamoney.moneta.function.MonetarySummaryStatistics;

class ExchangeRateMonetarySummaryStatistics  extends DefaultMonetarySummaryStatistics {

	private final ExchangeRateProvider provider;

	private final CurrencyConversion currencyConversion;

	ExchangeRateMonetarySummaryStatistics(CurrencyUnit currencyUnit,
			ExchangeRateProvider provider) {
		super(currencyUnit);
		this.provider = provider;
		currencyConversion = provider.getCurrencyConversion(getCurrencyUnit());

	}

	@Override
	public void accept(MonetaryAmount amount) {
		super.accept(currencyConversion.apply(amount));
	}

	@Override
	public MonetarySummaryStatistics combine(
			MonetarySummaryStatistics summaryStatistics) {

		if (isDifferentCurrency(Objects.requireNonNull(summaryStatistics)
				.getCurrencyUnit())) {

			return super.combine(convert(summaryStatistics));

		} else {
			return super.combine(summaryStatistics);
		}
	}

	private MonetarySummaryStatistics convert(
			MonetarySummaryStatistics summaryStatistics) {

		if (summaryStatistics.isExchangeable()) {
			return summaryStatistics.to(getCurrencyUnit());
		}
		return create(summaryStatistics);
	}

	private MonetarySummaryStatistics create(MonetarySummaryStatistics summary) {

		ExchangeRateMonetarySummaryStatistics another = new ExchangeRateMonetarySummaryStatistics(
				getCurrencyUnit(), provider);

		another.average = currencyConversion.apply(summary
				.getAverage());
		another.count = summary.getCount();
		another.max = currencyConversion.apply(summary.getMax());
		another.min = currencyConversion.apply(summary.getMin());
		another.sum = currencyConversion.apply(summary.getSum());
		return another;
	}

	private boolean isDifferentCurrency(CurrencyUnit unit) {
		return !getCurrencyUnit().equals(unit);
	}

	@Override
	public boolean isExchangeable() {
		return true;
	}

	@Override
	public MonetarySummaryStatistics to(CurrencyUnit unit) {
		CurrencyConversion currencyConversion = provider.getCurrencyConversion(unit);
		ExchangeRateMonetarySummaryStatistics another = new ExchangeRateMonetarySummaryStatistics(
				unit, provider);
		another.average = currencyConversion.apply(average);
		another.count = count;
		another.max = currencyConversion.apply(max);
		another.min = currencyConversion.apply(min);
		another.sum = currencyConversion.apply(sum);
		return another;
	}

}