001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.iso;
020
021/**
022 * AsciiPrefixer constructs a prefix for ASCII messages.
023 * 
024 * @author joconnor
025 * @version $Revision$ $Date$
026 */
027public class NullPrefixer implements Prefixer
028{
029    /** A handy instance of the null prefixer. */
030    public static final NullPrefixer INSTANCE = new NullPrefixer();
031
032    /** Hidden constructor */
033    private NullPrefixer() {}
034
035    @Override
036    public void encodeLength(int length, byte[] b) {}
037
038    /**
039         * Returns -1 meaning there is no length field.
040         *
041     */
042    @Override
043    public int decodeLength(byte[] b, int offset)
044    {
045        return -1;
046    }
047
048    @Override
049    public int getPackedLength()
050    {
051        return 0;
052    }
053}