package org.apache.ws.scout.registry;
   
   import java.util.Hashtable;
   import org.apache.ws.scout.model.uddi.v2.AuthToken;
   
   public class AuthTokenSingleton {
   	private static AuthTokenSingletoningleton.html#AuthTokenSingleton">AuthTokenSingleton instance = new AuthTokenSingleton();
   	private static Hashtable cachedAuthTokenHash = new Hashtable();
   	
  	private AuthTokenSingleton() {
  	}
  
  	public static AuthToken getToken(String username) {
  		if (instance == null) {
  			instance = new AuthTokenSingleton();
  		}
  
  		if (cachedAuthTokenHash.containsKey(username)) 
  			return (AuthToken) cachedAuthTokenHash.get(username);
  	
  		return null;
  	} 	
  	
  	public synchronized static void addAuthToken(String username, 
  			AuthToken token) {
  		if (instance == null) {
  			instance = new AuthTokenSingleton();
  		}
  		cachedAuthTokenHash.put(username, token);
  	}
  	
  	public synchronized static void deleteAuthToken(String username) {
  		if (instance == null) {
  			instance = new AuthTokenSingleton();
  		} else {
  			if (cachedAuthTokenHash.containsKey(username)) {
  				cachedAuthTokenHash.remove(username);
  			}
  		}
  	}
  }