// Copyright 2006, 2007 The Apache Software 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.

 package org.apache.tapestry5.internal.util;

 import java.util.concurrent.atomic.AtomicReference;

 /**

  * An object that holds some type of other object. This is useful for communicating information from an inner class

  * (used as a closure) to the containing method. This is similar to {@link AtomicReference}, except that it is simpler

  * but <strong>not</strong> thread safe.

  *

  * @param <T>

  */

 public class Holder<T>

 {

     private T held;

     public void put(T object)

     {

         held = object;

     }

     public T get()

     {

         return held;

     }

     public boolean hasValue()

     {

         return held != null;

     }

     public static <T> Holder<T> create()

     {

         return new Holder<T>();

     }

 }