package org.apache.helix.controller.stages;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.HashMap;
  import java.util.Map;
  
  import org.apache.log4j.Logger;
  
  public class ClusterEvent
  {
    private static final Logger logger = Logger.getLogger(ClusterEvent.class
        .getName());
    private final String _eventName;
    private final Map<String, Object> _eventAttributeMap;
  
    public ClusterEvent(String name)
    {
      _eventName = name;
      _eventAttributeMap = new HashMap<String, Object>();
    }
  
    public void addAttribute(String attrName, Object attrValue)
    {
      if (logger.isTraceEnabled())
      {
        logger.trace("Adding attribute:" + attrName);
        logger.trace(" attribute value:" + attrValue);
      }
     
      _eventAttributeMap.put(attrName, attrValue);
    }
  
    public String getName()
    {
      return _eventName;
    }
  
    @SuppressWarnings("unchecked")
    public <T extends Object> T getAttribute(String attrName)
    {
      Object ret = _eventAttributeMap.get(attrName);
      if (ret != null)
      {
        return (T) ret;
      }
      return null;
    }
    
    @Override
    public String toString()
    {
      StringBuilder sb = new StringBuilder();
      sb.append("name:"+ _eventName).append("\n");
      for(String key:_eventAttributeMap.keySet()){
        sb.append(key).append(":").append(_eventAttributeMap.get(key)).append("\n");
      }
      return sb.toString();
    }
  }