/*

  * 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 javax.faces.webapp;

 import javax.faces.component.UIComponent;

 import javax.faces.context.FacesContext;

 import javax.faces.el.ValueBinding;

 import javax.servlet.jsp.JspException;

 import javax.servlet.jsp.tagext.Tag;

 import javax.servlet.jsp.tagext.TagSupport;

 /**

  * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>

  * 

  * @deprecated the implementation of this clazz is now an implementation detail.

  */

 public class AttributeTag extends TagSupport

 {

     private static final long serialVersionUID = 3147657100171678632L;

     private String _name;

     private String _value;

     /**

      * @deprecated

      * @param name

      */

     public void setName(String name)

     {

         _name = name;

     }

     /**

      * @deprecated

      * @param value

      */

     public void setValue(String value)

     {

         _value = value;

     }

     /**

      * @deprecated

      */

     @Override

     public int doStartTag() throws JspException

     {

         UIComponentTag componentTag = UIComponentTag.getParentUIComponentTag(pageContext);

         if (componentTag == null)

         {

             throw new JspException("no parent UIComponentTag found");

         }

         UIComponent component = componentTag.getComponentInstance();

         if (component == null)

         {

             throw new JspException("parent UIComponentTag has no UIComponent");

         }

         String name = getName();

         if (component.getAttributes().get(name) == null)

         {

             Object value = getValue();

             if (value != null)

             {

                 component.getAttributes().put(name, value);

             }

         }

         return Tag.SKIP_BODY;

     }

     /**

      * @deprecated

      */

     @Override

     public void release()

     {

         super.release();

         _name = null;

         _value = null;

     }

     private String getName()

     {

         if (UIComponentTag.isValueReference(_name))

         {

             FacesContext facesContext = FacesContext.getCurrentInstance();

             ValueBinding vb = facesContext.getApplication().createValueBinding(_name);

             return (String)vb.getValue(facesContext);

         }

         return _name;

     }

     private Object getValue()

     {

         if (UIComponentTag.isValueReference(_value))

         {

             FacesContext facesContext = FacesContext.getCurrentInstance();

             ValueBinding vb = facesContext.getApplication().createValueBinding(_value);

             return vb.getValue(facesContext);

         }

         return _value;

     }

 }