nameregistrar.java

pos机交易实现源代码 含金融卡交易8583协议实现 开发环境：linux 典型应用：嵌入系统开发 仅供参考

/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package org.jpos.util;

import java.util.Map;
import java.util.Hashtable;
import java.util.Iterator;
import java.io.PrintStream;

/**
 * Allow runtime binding of jPOS's components (ISOChannels, Logger, MUXes, etc)
 * @author <a href="mailto:[e-mail]">Alejandro P. Revilla</a>
 * @version $Revision: 1.4 $ $Date: 2001/11/02 15:10:14 $
 */
public class NameRegistrar implements Loggeable {
    private static NameRegistrar instance = null;
    private Map registrar;

    public static class NotFoundException extends Exception {
	public NotFoundException() {
	    super();
	}
	public NotFoundException(String detail) {
	    super(detail);
	}
    }

    private NameRegistrar() {
	super();
	registrar = new Hashtable();
    }
    public static Map getMap() {
	return getInstance().registrar;
    }
    /**
     * @return singleton instance
     */
    public static NameRegistrar getInstance() {
        if (instance == null) {
            synchronized (NameRegistrar.class) {
                if (instance == null) 
                    instance = new NameRegistrar();
            }
        }
        return instance;
    }
    /**
     * register object
     * @param key - key with which the specified value is to be associated.
     * @param value - value to be associated with the specified key
     */
    public static void register (String key, Object value) {
	getMap().put (key, value);
    }
    /**
     * @param key key whose mapping is to be removed from registrar.
     */
    public static void unregister (String key) {
	getMap().remove (key);
    }
    /**
     * @param key key whose associated value is to be returned.
     * @throws NotFoundException if key not present in registrar
     */
    public static Object get (String key) throws NotFoundException {
	Object obj = getMap().get(key);
	if (obj == null)
	    throw new NotFoundException (key);
	return obj;
    }

    public void dump (PrintStream p, String indent) {
	String inner = indent + "  ";
        p.println (indent + "<name-registrar>");
        Iterator iter = registrar.entrySet().iterator();
        while (iter.hasNext()) {
            Map.Entry entry = (Map.Entry) iter.next ();
            p.println (inner + 
                "<name>" + entry.getKey().toString() + "</name>"
            );
            p.println (inner + 
                "<class>" + entry.getValue().getClass().getName()+ "</class>"
            );
        }
        p.println (indent + "</name-registrar>");
    }
}