SingletonManager.java

/* 
 * Copyright 2003, 2004, 2005 Colin Crist
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package hermes;

import java.util.HashMap;
import java.util.Map;

public class SingletonManager
{

   private static final Map<Class, Object> objects = new HashMap<Class, Object>();

   public static Object get(Class clazz)
   {
      synchronized (objects)
      {
         Object rval = objects.get(clazz);

         if (rval == null)
         {
            try
            {
               rval = clazz.newInstance();
               objects.put(clazz, rval) ;
            }
            catch (Exception ex)
            {
               throw new HermesRuntimeException("Cannot create singleton for " + clazz.getName() + ": " + ex.getMessage(), ex);
            }
         }

         return rval;
      }
   }

   public static void put(Class clazz, Object object)
   {
      synchronized (objects)
      {
         objects.put(clazz, object);
      }
   }
}