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jPOS is an ISO-8583 based financial transaction library/framework that can be customized and extended in order to implement financial interchanges.

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/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2013 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */

package org.jpos.iso;

/**
 * Implements EBCDIC Interpreter for signed numerics.
 * (see http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/index.jsp?topic=/com.ibm.etools.mft.doc/ad06900_.htm)
 * Strings are converted to and from EBCDIC bytes.
 * Negatives will be prepended with "-"
 * Unsigned numbers are interpreted as positive
 * 
 * @author [email protected]
 * @version $Revision$ $Date$
 */
public class SignedEbcdicNumberInterpreter implements Interpreter
{
    /** An instance of this Interpreter. Only one needed for the whole system */
    public static final SignedEbcdicNumberInterpreter INSTANCE = new SignedEbcdicNumberInterpreter();

    public void interpret(String data, byte[] targetArray, int offset) {
        boolean negative = data.startsWith("-");
        if (negative) {
            ISOUtil.asciiToEbcdic(data.substring(1), targetArray, offset);
            targetArray[offset + data.length() - 2] = (byte) (targetArray[offset + data.length() - 2] & 0xDF); 
        } else {
            ISOUtil.asciiToEbcdic(data, targetArray, offset);
        }
    }

    public String uninterpret(byte[] rawData, int offset, int length) {
        boolean negative = ((byte)(rawData[offset + length - 1] & 0xF0)) == ((byte)0xD0);
        rawData[offset + length - 1] = ((byte)(rawData[offset + length - 1] | 0xF0));
        return (negative ? "-" : "") + ISOUtil.ebcdicToAscii(rawData, offset, length);
    }

    public int getPackedLength(int nDataUnits)
    {
        return nDataUnits;
    }
}