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Private implementation of the Apache MyFaces Trinidad project
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/*
 *  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.myfaces.trinidadinternal.ui.composite;

import java.util.concurrent.ConcurrentHashMap;

import org.apache.myfaces.trinidadinternal.ui.AttributeKey;
import org.apache.myfaces.trinidadinternal.ui.UIXRenderingContext;
import org.apache.myfaces.trinidadinternal.ui.UINode;

import org.apache.myfaces.trinidadinternal.ui.data.BoundValue;

/**
 * BoundValue that retrieves its value
 * from the attrKey attribute of the parent
 * RenderingContext's currentUINode.
 * 
 * This BoundValue is typically used to implement UINodeRenderers.
 * 

 * @version $Name:  $ ($Revision: adfrt/faces/adf-faces-impl/src/main/java/oracle/adfinternal/view/faces/ui/composite/RootAttributeBoundValue.java#0 $) $Date: 10-nov-2005.18:56:52 $
 * @deprecated This class comes from the old Java 1.2 UIX codebase and should not be used anymore.
 */
@Deprecated
public class RootAttributeBoundValue implements BoundValue
{
  /**
   * Factory method for getting cached instances of
   * RootAttributeBoundValue.
   */
  public static RootAttributeBoundValue getBoundValue(
    AttributeKey attrKey
    )
  {
    RootAttributeBoundValue boundValue = _boundValues.get(attrKey);

    if (boundValue == null)
    {
      boundValue = new RootAttributeBoundValue(attrKey);

      _boundValues.put(attrKey, boundValue);
    }

    return boundValue;
  }


  /*
   * BoundValue that retrieves its value
   * from the attrKey attribute of the parent
   * RenderingContext's currentUINode.
   * 
   * This BoundValue is typically used to implement UINodeRenderers.
   * from.
   * @param attrKey AttribtueKey of attribute to retrieve.
   */
  protected RootAttributeBoundValue(
    AttributeKey attrKey
    )
  {
    if (attrKey == null)
      throw new IllegalArgumentException();

    _attrKey = attrKey;
  }

  /**
   * Called to retrieve a value based on the current rendering
   * context.
   * @param context the rendering context
   */
  public Object getValue(
    UIXRenderingContext context
    )
  {
    UIXRenderingContext parentContext = context.getParentContext();

    if (parentContext != null)
    {
      UINode baseNode = parentContext.getAncestorNode(0);

      if (baseNode != null)
      {
        return baseNode.getAttributeValue(parentContext, _attrKey);
      }
    }

    return null;
  }

  private static ConcurrentHashMap _boundValues = 
    new ConcurrentHashMap();

  private AttributeKey _attrKey;
}