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Java example source code file (AmountPrinterParser.java)

This example Java source code file (AmountPrinterParser.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

amountprinterparser, appendable, bigdecimal, bigmoney, ioexception, math, moneyamountstyle, moneyparser, moneyprinter, numberformatexception, override, serializable, string, stringbuilder

The AmountPrinterParser.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 the amount part of the money.
 * <p>
 * This class is immutable and thread-safe.
 */
final class AmountPrinterParser implements MoneyPrinter, MoneyParser, Serializable {

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

    /** The style to use. */
    private final MoneyAmountStyle style;

    /**
     * Constructor.
     * @param style  the style, not null
     */
    AmountPrinterParser(MoneyAmountStyle style) {
        this.style = style;
    }

    //-----------------------------------------------------------------------
    @Override
    public void print(MoneyPrintContext context, Appendable appendable, BigMoney money) throws IOException {
        MoneyAmountStyle activeStyle = style.localize(context.getLocale());
        if (money.isNegative()) {
            money = money.negated();
            if (!activeStyle.isAbsValue()) {
                appendable.append(activeStyle.getNegativeSignCharacter());
            }
        }
        String str = money.getAmount().toPlainString();
        char zeroChar = activeStyle.getZeroCharacter();
        if (zeroChar != '0') {
            int diff = zeroChar - '0';
            StringBuilder zeroConvert = new StringBuilder(str);
            for (int i = 0; i < str.length(); i++) {
                char ch = str.charAt(i);
                if (ch >= '0' && ch <= '9') {
                    zeroConvert.setCharAt(i, (char) (ch + diff));
                }
            }
            str = zeroConvert.toString();
        }
        final int decPoint = str.indexOf('.');
        final int afterDecPoint = decPoint + 1;
        if (activeStyle.getGroupingStyle() == GroupingStyle.NONE) {
            if (decPoint < 0) {
                appendable.append(str);
                if (activeStyle.isForcedDecimalPoint()) {
                    appendable.append(activeStyle.getDecimalPointCharacter());
                }
            } else {
                appendable.append(str.subSequence(0, decPoint))
                    .append(activeStyle.getDecimalPointCharacter()).append(str.substring(afterDecPoint));
            }
        } else {
            int groupingSize = activeStyle.getGroupingSize();
            int extendedGroupingSize = activeStyle.getExtendedGroupingSize();
            extendedGroupingSize = extendedGroupingSize == 0 ? groupingSize : extendedGroupingSize;
            char groupingChar = activeStyle.getGroupingCharacter();
            int pre = (decPoint < 0 ? str.length() : decPoint);
            int post = (decPoint < 0 ? 0 : str.length() - decPoint - 1);
            appendable.append(str.charAt(0));
            for (int i = 1; i < pre; i++) {
                if (isPreGroupingPoint(pre - i, groupingSize, extendedGroupingSize)) {
                    appendable.append(groupingChar);
                }
                appendable.append(str.charAt(i));
            }
            if (decPoint >= 0 || activeStyle.isForcedDecimalPoint()) {
                appendable.append(activeStyle.getDecimalPointCharacter());
            }
            if (activeStyle.getGroupingStyle() == GroupingStyle.BEFORE_DECIMAL_POINT) {
                if (decPoint >= 0) {
                    appendable.append(str.substring(afterDecPoint));
                }
            } else {
                for (int i = 0; i < post; i++) {
                    appendable.append(str.charAt(i + afterDecPoint));
                    if (isPostGroupingPoint(i, post, groupingSize, extendedGroupingSize)) {
                        appendable.append(groupingChar);
                    }
                }
            }
        }
    }

    private boolean isPreGroupingPoint(int remaining, int groupingSize, int extendedGroupingSize) {
        if (remaining >= groupingSize + extendedGroupingSize) {
            return (remaining - groupingSize) % extendedGroupingSize == 0;
        }
        return remaining % groupingSize == 0;
    }

    private boolean isPostGroupingPoint(int i, int post, int groupingSize, int extendedGroupingSize) {
        boolean atEnd = (i + 1) >= post;
        if (i > groupingSize) {
            return (i - groupingSize) % extendedGroupingSize == (extendedGroupingSize - 1) && !atEnd;
        }
        return i % groupingSize == (groupingSize - 1) && !atEnd;
    }

    @Override
    public void parse(MoneyParseContext context) {
        final int len = context.getTextLength();
        final MoneyAmountStyle activeStyle = style.localize(context.getLocale());
        char[] buf = new char[len - context.getIndex()];
        int bufPos = 0;
        boolean dpSeen = false;
        int pos = context.getIndex();
        if (pos < len) {
            char ch = context.getText().charAt(pos++);
            if (ch == activeStyle.getNegativeSignCharacter()) {
                buf[bufPos++] = '-';
            } else if (ch == activeStyle.getPositiveSignCharacter()) {
                buf[bufPos++] = '+';
            } else if (ch >= activeStyle.getZeroCharacter() && ch < activeStyle.getZeroCharacter() + 10) {
                buf[bufPos++] = (char) ('0' + ch - activeStyle.getZeroCharacter());
            } else if (ch == activeStyle.getDecimalPointCharacter()) {
                buf[bufPos++] = '.';
                dpSeen = true;
            } else {
                context.setError();
                return;
            }
        }
        boolean lastWasGroup = false;
        for ( ; pos < len; pos++) {
            char ch = context.getText().charAt(pos);
            if (ch >= activeStyle.getZeroCharacter() && ch < activeStyle.getZeroCharacter() + 10) {
                buf[bufPos++] = (char) ('0' + ch - activeStyle.getZeroCharacter());
                lastWasGroup = false;
            } else if (ch == activeStyle.getDecimalPointCharacter() && dpSeen == false) {
                buf[bufPos++] = '.';
                dpSeen = true;
                lastWasGroup = false;
            } else if (ch == activeStyle.getGroupingCharacter() && lastWasGroup == false) {
                lastWasGroup = true;
            } else {
                break;
            }
        }
        if (lastWasGroup) {
            pos--;
        }
        try {
            context.setAmount(new BigDecimal(buf, 0, bufPos));
            context.setIndex(pos);
        } catch (NumberFormatException ex) {
            context.setError();
        }
    }

    @Override
    public String toString() {
        return "${amount}";
    }

}

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