ucs2encoding.java

短信短消息SMPP开发的JAVA API最新版本。

/*
 * 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 1.5 2002/10/13 16:09:30 orank Exp $
 */

package ie.omk.smpp.util;

public class UCS2Encoding
    extends ie.omk.smpp.util.AlphabetEncoding
{
    private String encType = "UTF-16BE";

    private static final int DCS = 8;

    private static final UCS2Encoding beInstance = new UCS2Encoding(true);

    private static final UCS2Encoding leInstance = new UCS2Encoding(false);

    /** Construct a new UCS2 encoding.
     * @param bigEndian true to use UTF-16BE, false to use UTF-16LE.
     */
    private UCS2Encoding(boolean bigEndian)
    {
	super (DCS);

	if (!bigEndian)
	    encType = "UTF-16LE";
    }

    /** Get the singleton instance of the big-endian UCS2Encoding.
     */
    public static UCS2Encoding getInstance() {
	return (beInstance);
    }

    /** Get the singleton instance of either the big-endian or little-endian
     * instance of UCS2Encoding.
     * @param bigEndian true to get the big-endian instance, false to get the
     * little-endian instance.
     */
    public static UCS2Encoding getInstance(boolean bigEndian) {
	if (bigEndian)
	    return (beInstance);
	else
	    return (leInstance);
    }

    /** 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, encType));
	} 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(encType));
	} catch (java.io.UnsupportedEncodingException x) {
	    return (new byte[0]);
	}
    }

    public int getEncodingLength() {
	return (16);
    }
}