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Java example source code file (SignedPrinterParser.java)

This example Java source code file (SignedPrinterParser.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

appendable, bigmoney, ioexception, math, moneyformatter, moneyparsecontext, moneyparser, moneyprinter, override, positivezeronegative, serializable, signedprinterparser, string

The SignedPrinterParser.java Java example source code

/*
 *  Copyright 2009-present, Stephen Colebourne
 *
 *  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.joda.money.format;

import java.io.IOException;
import java.io.Serializable;
import java.math.BigDecimal;

import org.joda.money.BigMoney;

/**
 * Prints and parses using delegated formatters, one for positive and one for megative.
 * <p>
 * This class is immutable and thread-safe.
 */
final class SignedPrinterParser implements MoneyPrinter, MoneyParser, Serializable {

    /** Serialization version. */
    private static final long serialVersionUID = 1L;

    /** The formatter to use when positive. */
    private final MoneyFormatter whenPositive;
    /** The formatter to use when zero. */
    private final MoneyFormatter whenZero;
    /** The formatter to use when negative. */
    private final MoneyFormatter whenNegative;

    /**
     * Constructor.
     * @param whenPositive  the formatter to use when the amount is positive
     * @param whenZero  the formatter to use when the amount is zero
     * @param whenNegative  the formatter to use when the amount is positive
     */
    SignedPrinterParser(MoneyFormatter whenPositive, MoneyFormatter whenZero, MoneyFormatter whenNegative) {
        this.whenPositive = whenPositive;
        this.whenZero = whenZero;
        this.whenNegative = whenNegative;
    }

    //-----------------------------------------------------------------------
    @Override
    public void print(MoneyPrintContext context, Appendable appendable, BigMoney money) throws IOException {
        MoneyFormatter fmt = (money.isZero() ? whenZero : money.isPositive() ? whenPositive : whenNegative);
        fmt.getPrinterParser().print(context, appendable, money);
    }

    @Override
    public void parse(MoneyParseContext context) {
        MoneyParseContext positiveContext = context.createChild();
        whenPositive.getPrinterParser().parse(positiveContext);
        MoneyParseContext zeroContext = context.createChild();
        whenZero.getPrinterParser().parse(zeroContext);
        MoneyParseContext negativeContext = context.createChild();
        whenNegative.getPrinterParser().parse(negativeContext);
        MoneyParseContext best = null;
        if (!positiveContext.isError()) {
            best = positiveContext;
        }
        if (!zeroContext.isError()) {
            if (best == null || zeroContext.getIndex() > best.getIndex()) {
                best = zeroContext;
            }
        }
        if (!negativeContext.isError()) {
            if (best == null || negativeContext.getIndex() > best.getIndex()) {
                best = negativeContext;
            }
        }
        if (best == null) {
            context.setError();
        } else {
            context.mergeChild(best);
            if (best == zeroContext) {
                if (context.getAmount() == null || context.getAmount().compareTo(BigDecimal.ZERO) != 0) {
                    context.setAmount(BigDecimal.ZERO);
                }
            } else if (best == negativeContext && context.getAmount().compareTo(BigDecimal.ZERO) > 0) {
                context.setAmount(context.getAmount().negate());
            }
        }
    }

    @Override
    public String toString() {
        return "PositiveZeroNegative(" + whenPositive + "," + whenZero + "," + whenNegative + ")";
    }

}

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