package org.apache.turbine.pipeline;

 import java.util.HashMap;

 import java.util.Map;

 /*

  * 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.

  */

 /**

  * <p>A <b>PipelineData</b> is a holder for data being passed from one

  * Valve to the next.

  * The detailed contract for a Valve is included in the description of

  * the <code>invoke()</code> method below.</p>

  *

  * <b>HISTORICAL NOTE</b>:  The "PipelineData" name was assigned to this

  * holder as it functions similarly to the RunData object, but without

  * the additional methods

  *

  * @author <a href="mailto:epugh@opensourceconnections.com">Eric Pugh</a>

  * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>

  */

 public class DefaultPipelineData implements PipelineData

 {

     private final Map<Class<?>, Map<Class<?>, ? super Object>> map =

         new HashMap<Class<?>, Map<Class<?>, ? super Object>>();

     /**

      * Put a configured map of objects into the pipeline data object

      *

      * @param key the key class

      * @param value the value map

      */

     @Override

     public void put(Class<?> key, Map<Class<?>, ? super Object> value)

     {

         map.put(key, value);

     }

     /**

      * Get the configured map of objects for the given key

      *

      * @param key the key class

      * @return the value map or null if no such key exists

      */

     @Override

     public Map<Class<?>, ? super Object> get(Class<?> key)

     {

         return map.get(key);

     }

     /**

      * Get a value from the configured map of objects for the given keys

      *

      * @param key the key class

      * @param innerKey the key into the value map

      * @return the inner value or null if no such keys exist

      */

     @Override

     @SuppressWarnings("unchecked")

     public <T> T get(Class<?> key, Class<T> innerKey)

     {

         Map<Class<?>, ? super Object> innerMap = get(key);

         if (innerMap == null)

         {

             return null;

         }

         return (T) innerMap.get(innerKey);

     }

 }