/*
* Copyright 2002-2010 the original author or authors.
*
* 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.springframework.format.number;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Currency;
import java.util.Locale;
import org.springframework.util.ClassUtils;
/**
* A BigDecimal formatter for currency values.
*
* <p>Delegates to {@link NumberFormat#getCurrencyInstance(Locale)}.
* Configures BigDecimal parsing so there is no loss of precision.
* Can apply a specified {@link RoundingMode} to parsed values.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 3.0
* @see #setLenient
* @see #setRoundingMode
*/
public class CurrencyFormatter extends AbstractNumberFormatter {
private static final boolean roundingModeOnDecimalFormat =
ClassUtils.hasMethod(DecimalFormat.class, "setRoundingMode", RoundingMode.class);
private int fractionDigits = 2;
private RoundingMode roundingMode;
private Currency currency;
/**
* Specify the desired number of fraction digits.
* Default is 2.
*/
public void setFractionDigits(int fractionDigits) {
this.fractionDigits = fractionDigits;
}
/**
* Specify the rounding mode to use for decimal parsing.
* Default is {@link RoundingMode#UNNECESSARY}.
*/
public void setRoundingMode(RoundingMode roundingMode) {
this.roundingMode = roundingMode;
}
/**
* Specify the currency, if known.
*/
public void setCurrency(Currency currency) {
this.currency = currency;
}
public BigDecimal parse(String text, Locale locale) throws ParseException {
BigDecimal decimal = (BigDecimal) super.parse(text, locale);
if (decimal != null) {
if (this.roundingMode != null) {
decimal = decimal.setScale(this.fractionDigits, this.roundingMode);
}
else {
decimal = decimal.setScale(this.fractionDigits);
}
}
return decimal;
}
protected NumberFormat getNumberFormat(Locale locale) {
DecimalFormat format = (DecimalFormat) NumberFormat.getCurrencyInstance(locale);
format.setParseBigDecimal(true);
format.setMaximumFractionDigits(this.fractionDigits);
format.setMinimumFractionDigits(this.fractionDigits);
if (this.roundingMode != null && roundingModeOnDecimalFormat) {
format.setRoundingMode(this.roundingMode);
}
if (this.currency != null) {
format.setCurrency(this.currency);
}
return format;
}
}
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