octetencoder.java

开放源码的smpp协议开发包

/*
 * Java SMPP API
 * Copyright (C) 1998 - 2002 by Oran Kelly
 * 
 * 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 2.1 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * A copy of the LGPL can be viewed at http://www.gnu.org/copyleft/lesser.html
 * Java SMPP API author: [e-mail]
 * Java SMPP API Homepage: http://smppapi.sourceforge.net/
 * $Id: OctetEncoder.java,v 1.3 2005/05/09 21:04:51 orank Exp $
 */
package ie.omk.smpp.message.tlv;

/**
 * Encode an octet string to a byte array. This class is encoding byte arrays to
 * byte arrays! Therefore it's just copying bytes around. Not much more to it.
 * 
 * @author Oran Kelly <[e-mail]>
 */
public class OctetEncoder implements Encoder {

    /**
     * OctetEncoder singleton instance.
     */
    private static final OctetEncoder instance = new OctetEncoder();

    /**
     * Create a new OctetEncoder.
     */
    private OctetEncoder() {
    }

    /**
     * Get the singleton OctetEncoder instance.
     * 
     * @return The singleton OctetEncoder instance.
     */
    public static final OctetEncoder getInstance() {
        return (instance);
    }

    public void writeTo(Tag tag, Object value, byte[] b, int offset)
            throws ArrayIndexOutOfBoundsException {
        try {
            byte[] valBytes = (byte[]) value;
            System.arraycopy(valBytes, 0, b, offset, valBytes.length);
        } catch (ClassCastException x) {
            throw new BadValueTypeException("Value must be of type byte[]");
        }
    }

    public Object readFrom(Tag tag, byte[] b, int offset, int length)
            throws ArrayIndexOutOfBoundsException {
        byte[] val = new byte[length];
        System.arraycopy(b, offset, val, 0, length);
        return (val);
    }

    public int getValueLength(Tag tag, Object value) {
        try {
            byte[] b = (byte[]) value;
            return (b.length);
        } catch (ClassCastException x) {
            throw new BadValueTypeException("Value must be of type byte[]");
        }
    }
}