/* * 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: orank@users.sf.net * Java SMPP API Homepage: http://smppapi.sourceforge.net/ * $Id: AlphabetFactory.java,v 1.7 2004/10/09 22:02:42 orank Exp $ */package ie.omk.smpp.util;import org.apache.commons.logging.LogFactory;/** Factory class for getting SMS alphabet encoding objects. * The API maintains what it considers a 'default alphabet' for the current VM. * If nothing else is specified, that alphabet will be an instance of the SMS * default alphabet (implemented by the ie.omk.smpp.util.DefaultAlphabetExt * class). Changing the API's default alphabet to another is merely a case of * setting the "smpp.default_alphabet" System property to the name of another * class, which must implement the ie.omk.smpp.util.SMSAlphabet interface. */public final class AlphabetFactory{    private static AlphabetEncoding defaultAlphabet = null;    private static final String DEFAULT_ALPHABET_PROPNAME = "smpp.default_alphabet";    private AlphabetFactory()    {	// AlphabetFactory.Sounds like something off Sesame Street, doesn't it?	// ;-)    }    /** Return the default alphabet for this runtime environment. The default     * alphabet is usually the SMS Default alphabet     * (ie.omk.smpp.util.DefaultAlphabetExt). This can be altered by setting the     * <b>smpp.default_alphabet</b> system property to the name of a concrete     * sub-class of ie.omk.smpp.util.SMSAlphabet. For example, if you have     * written an alphabet class called 'it.smpp.MyAlphabet', then when running     * your smppapi-based application, supply a system property using the -D     * switch:<br>     * <code>java -cp .:smppapi.jar -Dsmpp.default_alphabet=ie.smpp.MyAlphabet     * ...</code>     */    public static AlphabetEncoding getDefaultAlphabet()    {	if (defaultAlphabet == null)	    init();	return (defaultAlphabet);    }    private static final void init() {	String className = "";	try {	    className = System.getProperty(DEFAULT_ALPHABET_PROPNAME);	    if (className != null) {		Class alphaClass = Class.forName(className);		defaultAlphabet = (AlphabetEncoding)alphaClass.newInstance();	    } else {		defaultAlphabet = DefaultAlphabetEncoding.getInstance();	    }	} catch (Exception x) {	    // Leave the alphabet as DefaultAlphabet	    LogFactory.getLog(AlphabetFactory.class).warn("Couldn't load default alphabet "		    + className, x);	    defaultAlphabet = DefaultAlphabetEncoding.getInstance();	}    }    /** Get the SMSAlphabet needed for encoding messages in a particular     * language. At the moment this ONLY returns an instance of     * DefaultAlphabet seeing as that's the only alphabet implemented     * currently.     * @param lang The ISO code for the language the message is in.     */    public static AlphabetEncoding getAlphabet(String lang)    {	// XXX need to come up with a list of mappings here.	return (defaultAlphabet);    }}