ucs2encoding.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: UCS2Encoding.java,v 1.6 2004/12/03
 * 17:49:47 orank Exp $
 */

package ie.omk.smpp.util;

import java.io.UnsupportedEncodingException;

public class UCS2Encoding extends ie.omk.smpp.util.AlphabetEncoding {
    private static final String ENCODING = "ISO-10646-UCS-2";

    private static final int DCS = 8;

    private static UCS2Encoding instance = null;
    
    static {
        try {
            instance = new UCS2Encoding();
        } catch (UnsupportedEncodingException x) {
        }
    }

    /**
     * Construct a new UCS2 encoding.
     * @throws java.io.UnsupportedEncodingException if the ISO-10646-UCS-2
     * charset is not supported by the JVM.
     */
    public UCS2Encoding() throws UnsupportedEncodingException {
        super(DCS);

        // Force an exception if the charset is not supported.
        new String(new byte[0], ENCODING);
    }

    /**
     * Get an instance of the UCS2Encoding.
     * @throws java.io.UnsupportedEncodingException if the ISO-10646-UCS-2
     * charset is not supported by the JVM.
     */
    public static UCS2Encoding getInstance() throws UnsupportedEncodingException {
        return (instance);
    }

    /**
     * Decode SMS message text to a Java String. The SMS message is expected to
     * be in UCS2 format.
     */
    public String decodeString(byte[] b) {
        if (b == null)
            return ("");

        try {
            return (new String(b, ENCODING));
        } catch (java.io.UnsupportedEncodingException x) {
            return ("");
        }
    }

    /**
     * Encode a Java String to bytes using UCS2 (UTF-16).
     */
    public byte[] encodeString(String s) {
        if (s == null)
            return (new byte[0]);

        try {
            return (s.getBytes(ENCODING));
        } catch (java.io.UnsupportedEncodingException x) {
            return (new byte[0]);
        }
    }
}