// Copyright 2008 Thiago H. de Paula Figueiredo

 //

 // 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 br.com.arsmachina.tapestrycrud.encoder;

 import org.apache.tapestry5.EventContext;

 /**

  * Interface that encapsulates the Tapestry 5 activation context logic for objects of a given type.

  * 

  * @author Thiago H. de Paula Figueiredo

  * @param <T> the entity class related to this encoder.

  */

 public interface ActivationContextEncoder<T> {

         /**

          * Given an object, returns its activation context value.

          * 

          * @param object an {@link EventContext}.

          * @return an {@link Object}. It must be null if <code>object</code> is null.

          */

         public Object toActivationContext(T object);

         /**

          * Given an activation context value, returns its object.

          * 

          * @param value an {@link EventContext}.

          * @return a {@link T}.

          */

         public T toObject(EventContext value);

 }