alphabetfactory.java

Java写的smpp实现

/*
 * Java SMPP API
 * Copyright (C) 1998 - 2001 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/
 */

package ie.omk.smpp.util;

import ie.omk.debug.Debug;

/** 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 =
	new DefaultAlphabetEncoding();

    /** Initialise the default alphabet class.
      */
    static {
	String className = "";
	try {
	    className = System.getProperty("smpp.default_alphabet");
	    if (className != null) {
		Class alphaClass = Class.forName(className);
		defaultAlphabet = (AlphabetEncoding)alphaClass.newInstance();
	    }
	} catch (Exception x) {
	    // Leave the alphabet as DefaultAlphabetExt
	    Debug.warn(AlphabetFactory.class, "<static>",
		    "Could not load default alphabet " + className);
	}
    }

    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()
    {
	return (defaultAlphabet);
    }


    /** Get the SMSAlphabet needed for encoding messages in a particular
     * language. At the moment this ONLY returns an instance of
     * DefaultAlphabetExt 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 Well, we only have one alphabet implementation anyway, so there's
	// not much point in not returning that (even though it doesn't support
	// all languages).
	return (defaultAlphabet);
    }
}