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A Struts2 plugin for leveraging conversation scopes in Struts2

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/*******************************************************************************
 * 
 *  Struts2-Conversation-Plugin - An Open Source Conversation- and Flow-Scope Solution for Struts2-based Applications
 *  =================================================================================================================
 * 
 *  Copyright (C) 2012 by Rees Byars
 *  http://code.google.com/p/struts2-conversation/
 * 
 * **********************************************************************************************************************
 * 
 *  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.
 * 
 * **********************************************************************************************************************
 * 
 *  $Id: ConversationScope.java reesbyars $
 ******************************************************************************/
package com.google.code.rees.scope.guice;

import com.google.code.rees.scope.conversation.ConversationUtil;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.Scope;

/**
 * @author rees.byars
 */
public class ConversationScope implements Scope {

    @Override
    public  Provider scope(final Key key, final Provider provider) {

        return new Provider() {

            public T get() {

                String contextKey = String.valueOf(key.hashCode());

                @SuppressWarnings("unchecked")
                T value = (T) ConversationUtil.getField(contextKey);

                if (value == null) {
                    value = provider.get();
                    ConversationUtil.setField(contextKey, value);
                }

                return value;
            }
        };
    }

}