/*

  * $Id: ScopeExtractor.java 1066790 2011-02-03 12:06:20Z apetrelli $

  *

  * 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.

  */

 package org.apache.tiles.request.jsp.extractor;

 import java.util.Enumeration;

 import javax.servlet.jsp.JspContext;

 import org.apache.tiles.request.attribute.AttributeExtractor;

 /**

  * Extracts attributes from a numbered scope from {@link JspContext}.

  *

  * @version $Rev: 1066790 $ $Date: 2011-02-03 23:06:20 +1100 (Thu, 03 Feb 2011) $

  */

 public class ScopeExtractor implements AttributeExtractor {

     /**

      * The JSP context.

      */

     private JspContext context;

     /**

      * The scope number to use.

      */

     private int scope;

     /**

      * Constructor.

      *

      * @param context The JSP context.

      * @param scope The scope number.

      */

     public ScopeExtractor(JspContext context, int scope) {

         this.context = context;

         this.scope = scope;

     }

     @Override

     public void removeValue(String name) {

         context.removeAttribute(name, scope);

     }

     @Override

     public Enumeration<String> getKeys() {

         return context.getAttributeNamesInScope(scope);

     }

     @Override

     public Object getValue(String key) {

         return context.getAttribute(key, scope);

     }

     @Override

     public void setValue(String key, Object value) {

         context.setAttribute(key, value, scope);

     }

 }