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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.parse;

import com.solab.iso8583.CustomField;
import com.solab.iso8583.IsoType;
import com.solab.iso8583.IsoValue;
import com.solab.iso8583.util.Bcd;

import java.io.UnsupportedEncodingException;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;

/**
 * Parser for fields of type DATE6.
 *
 * @author Enrique Zamudio Date: 4/17/18 12:41 PM
 */
public class Date6ParseInfo extends DateTimeParseInfo {

    /**
     * Instantiates a new Date 6 parse info.
     */
    public Date6ParseInfo() {
   		super(IsoType.DATE6, 6);
   	}

    @Override
    public  IsoValue parse(int field, byte[] buf, int pos, CustomField custom) throws ParseException, UnsupportedEncodingException {
        if (pos < 0) {
            throw new ParseException(String.format("Invalid DATE6 field %d position %d",
                                field, pos), pos);
        }
        if (pos+6 > buf.length) {
            throw new ParseException(String.format(
                "Insufficient data for DATE6 field %d, pos %d", field, pos), pos);
        }
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        //Set the month in the date
        int year;
        if (forceStringDecoding) {
            year = Integer.parseInt(new String(buf, pos, 2, getCharacterEncoding()), 10);
            cal.set(Calendar.MONTH, Integer.parseInt(new String(buf, pos+2, 2, getCharacterEncoding()), 10)-1);
            cal.set(Calendar.DATE, Integer.parseInt(new String(buf, pos+4, 2, getCharacterEncoding()), 10));
        } else {
            year = ((buf[pos] - 48) * 10) + buf[pos + 1] - 48;
            cal.set(Calendar.MONTH, ((buf[pos + 2] - 48) * 10) + buf[pos + 3] - 49);
            cal.set(Calendar.DATE, ((buf[pos + 4] - 48) * 10) + buf[pos + 5] - 48);
        }
        if (year > 50) {
            cal.set(Calendar.YEAR, 1900+year);
        } else {
            cal.set(Calendar.YEAR, 2000+year);
        }
        return createValue(cal, false);
    }

    @Override
    public  IsoValue parseBinary(int field, byte[] buf, int pos, CustomField custom) throws ParseException, UnsupportedEncodingException {
        if (pos < 0) {
            throw new ParseException(String.format("Invalid DATE6 field %d position %d",
                            field, pos), pos);
        }
        if (pos+3 > buf.length) {
            throw new ParseException(String.format("Insufficient data for DATE6 field %d, pos %d",
                                field, pos), pos);
        }
        int[] tens = new int[3];
        int start = 0;
        for (int i = pos; i < pos + tens.length; i++) {
            tens[start++] = Bcd.parseBcdLength(buf[i]);
        }
        Calendar cal = Calendar.getInstance();
        //A SimpleDateFormat in the case of dates won't help because of the missing data
        //we have to use the current date for reference and change what comes in the buffer
        //Set the month in the date
        if (tens[0] > 50) {
            cal.set(Calendar.YEAR, 1900+tens[0]);
        } else {
            cal.set(Calendar.YEAR, 2000+tens[0]);
        }
        cal.set(Calendar.MONTH, tens[1] - 1);
        cal.set(Calendar.DATE, tens[2]);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND,0);
        if (tz != null) {
            cal.setTimeZone(tz);
        }
        return createValue(cal, true);
    }
}