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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;

import org.javamoney.moneta.spi.base.BaseMonetaryAmountFormat;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.Objects;

import javax.money.CurrencyUnit;
import javax.money.Monetary;
import javax.money.MonetaryAmount;
import javax.money.format.AmountFormatContext;
import javax.money.format.MonetaryParseException;

/**
 * class to format and parse a text string such as 'EUR 25.25' or vice versa.
 *
 * @author otaviojava
 */
class ToStringMonetaryAmountFormat extends BaseMonetaryAmountFormat {

    private final ToStringMonetaryAmountFormatStyle style;

    private ToStringMonetaryAmountFormat(ToStringMonetaryAmountFormatStyle style) {
        this.style = Objects.requireNonNull(style);
    }

    public static ToStringMonetaryAmountFormat of(
            ToStringMonetaryAmountFormatStyle style) {
        return new ToStringMonetaryAmountFormat(style);
    }

    @Override
    public String queryFrom(MonetaryAmount amount) {
        if (amount==null) {
            return null;
        }
        return amount.toString();
    }

    @Override
    public AmountFormatContext getContext() {
        throw new UnsupportedOperationException(
                "ToStringMonetaryAmountFormat does not support getContext()");
    }

    @Override
    public void print(Appendable appendable, MonetaryAmount amount)
            throws IOException {
        appendable.append(amount == null ? "null" : amount.toString());

    }

    @Override
    public MonetaryAmount parse(CharSequence text)
            throws MonetaryParseException {
		try {
			ParserMonetaryAmount amount = parserMonetaryAmount(text);
			return style.to(amount);
		} catch (Exception e) {
			throw new MonetaryParseException(e.getMessage(), text, 0);
		}
    }

    private ParserMonetaryAmount parserMonetaryAmount(CharSequence text) {
        String[] array = Objects.requireNonNull(text).toString().split(" ");
        if(array.length != 2) {
        	throw new MonetaryParseException("An error happened when try to parse the Monetary Amount.",text,0);
        }
        CurrencyUnit currencyUnit = Monetary.getCurrency(array[0]);
        BigDecimal number = new BigDecimal(array[1]);
        return new ParserMonetaryAmount(currencyUnit, number);
    }

    private static class ParserMonetaryAmount {
        ParserMonetaryAmount(CurrencyUnit currencyUnit, BigDecimal number) {
            this.currencyUnit = currencyUnit;
            this.number = number;
        }

        private final CurrencyUnit currencyUnit;
        private final BigDecimal number;
    }

    /**
     * indicates with implementation will used to format or parser in
     * ToStringMonetaryAmountFormat
     */
    public enum ToStringMonetaryAmountFormatStyle {
        MONEY {
            @Override
            MonetaryAmount to(ParserMonetaryAmount amount) {
                return Money.of(amount.number, amount.currencyUnit);
            }
        },
        FAST_MONEY {
            @Override
            MonetaryAmount to(ParserMonetaryAmount amount) {
                return FastMoney.of(amount.number, amount.currencyUnit);
            }
        },
        ROUNDED_MONEY {
            @Override
            MonetaryAmount to(ParserMonetaryAmount amount) {
                return RoundedMoney.of(amount.number, amount.currencyUnit);
            }
        };

        private static final long serialVersionUID = 6606016328162974467L;
        abstract MonetaryAmount to(ParserMonetaryAmount amount);
    }

}