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Java implementation of the ISO 8583 protocol, focused on making the creation, edition and reading of ISO8583 messages as simple and flexible as possible.

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/*
 * j8583 A Java implementation of the ISO8583 protocol
 * Copyright (C) 2007 Enrique Zamudio Lopez
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */
package com.solab.iso8583.codecs;

import com.solab.iso8583.CustomBinaryField;
import com.solab.iso8583.util.Bcd;

import java.math.BigInteger;

/**
 * A custom field encoder/decoder to be used with LLBIN/LLLBIN fields
 * that contain BigIntegers in BCD encoding.
 *
 * @author Enrique Zamudio         Date: 07/05/13 13:02
 */
public class BigIntBcdCodec implements CustomBinaryField {

    private final boolean rightPadded;

    /**
     * Instantiates a new Big int bcd codec.
     */
    public BigIntBcdCodec() {
        this(false);
    }

    /**
     * Instantiates a new Big int bcd codec.
     *
     * @param rightPadded the right padded
     */
    public BigIntBcdCodec(boolean rightPadded) {
        this.rightPadded = rightPadded;
    }

    @Override
    public BigInteger decodeBinaryField(byte[] value, int pos, int len) {
        return rightPadded ? Bcd.decodeRightPaddedToBigInteger(value, pos, len*2)
            : Bcd.decodeToBigInteger(value, pos, len*2);
    }

    @Override
    public byte[] encodeBinaryField(BigInteger value) {
        final String s = value.toString(10);
        final byte[] buf = new byte[s.length() / 2 + s.length() % 2];
        if (rightPadded) {
            Bcd.encodeRightPadded(s, buf);
        } else {
            Bcd.encode(s, buf);
        }
        return buf;
    }

    @Override
    public BigInteger decodeField(String value) {
        return new BigInteger(value, 10);
    }

    @Override
    public String encodeField(BigInteger value) {
        return value.toString(10);
    }

}