package org.codehaus.plexus.lifecycle;
   
   /*
    * Copyright 2001-2006 Codehaus Foundation.
    *
    * 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.
   */
  
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  /**
   * @author Jason van Zyl
   */
  public class DefaultLifecycleHandlerManager implements LifecycleHandlerManager {
      private final ConcurrentMap<String, LifecycleHandler> lifecycleHandlers =
              new ConcurrentHashMap<String, LifecycleHandler>();
  
      private String defaultLifecycleHandlerId = "plexus";
  
      public void addLifecycleHandler(LifecycleHandler lifecycleHandler) {
          lifecycleHandlers.put(lifecycleHandler.getId(), lifecycleHandler);
      }
  
      public void initialize() {
          for (LifecycleHandler lifecycleHandler : lifecycleHandlers.values()) {
              lifecycleHandler.initialize();
          }
      }
  
      public LifecycleHandler getLifecycleHandler(String id) throws UndefinedLifecycleHandlerException {
          if (id == null) {
              id = defaultLifecycleHandlerId;
          }
  
          LifecycleHandler lifecycleHandler = lifecycleHandlers.get(id);
  
          if (lifecycleHandler == null) {
              throw new UndefinedLifecycleHandlerException("Specified lifecycle handler cannot be found: " + id);
          }
  
          return lifecycleHandler;
      }
  }