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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.MonetaryQuery;
/**
* This class allows to convert to minor part a {@link MonetaryAmount}
* instance.
* Recovery all value as minor units as a {@code long}.
*
* This returns the monetary amount in terms of the minor units of the
* currency, truncating the amount if necessary. For example, 'EUR 2.35'
* will return 235, and 'BHD -1.345' will return -1345.
*
* @author Anatole Tresch
*/
final class ConvertMinorPartQuery implements MonetaryQuery {
/**
* Private constructor, there is only one instance of this class, accessible
* calling {@link ConversionOperators#minorUnits()} ()}.
*/
ConvertMinorPartQuery() {
}
/**
* Gets the amount in minor units as a {@code long}.
*
* This returns the monetary amount in terms of the minor units of the
* currency, truncating the amount if necessary. For example, 'EUR 2.35'
* will return 235, and 'BHD -1.345' will return -1345.
*
* This method matches the API of {@link java.math.BigDecimal}.
*
* @return the minor units part of the amount
* @throws ArithmeticException
* if the amount is too large for a {@code long}
*/
@Override
public Long queryFrom(MonetaryAmount amount) {
Objects.requireNonNull(amount, "Amount required.");
BigDecimal number = amount.getNumber().numberValue(BigDecimal.class);
CurrencyUnit cur = amount.getCurrency();
int scale = cur.getDefaultFractionDigits();
if (scale < 0) {
scale = 0;
}
number = number.setScale(scale, RoundingMode.DOWN);
return number.movePointRight(number.scale()).longValueExact();
}
}