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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.

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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * 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.ajax4jsf.framework.renderer;

import java.util.HashMap;
import java.util.Stack;

import javax.faces.component.UIComponent;



/**
 * Components Base Renderer for all chameleon Skin's and components.
 * At most, make all common procedures and realise concrete work in "template" methods. 
 * @author [email protected] (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.2 $ $Date: 2006/07/29 11:49:08 $
 *
 */
public abstract class ComponentRendererBase extends RendererBase{
	
	/**
	 * logger for common cases. 
	 */
	protected static final String COMPONENT_RENDERER_BASE = ComponentRendererBase.class.getName();


	public ComponentVariables  getVariables(UIComponent component) {
		HashMap components;
		Stack stackComponentsVariables;		
		ComponentVariables variables;
		
		
		
		components = (HashMap)component.getAttributes().get( COMPONENT_RENDERER_BASE );
		
		if ( components == null ) {
			components = new HashMap();
			component.getAttributes().put( COMPONENT_RENDERER_BASE, components );
		}

		stackComponentsVariables = (Stack)components.get( this.getClass().getName() );

		if ( stackComponentsVariables == null ) {
			stackComponentsVariables = new Stack();
			components.put( COMPONENT_RENDERER_BASE, stackComponentsVariables );	
		}

		if ( stackComponentsVariables.empty() ) {
			variables = new ComponentVariables();
			stackComponentsVariables.push( variables );
		} else {
			variables = (ComponentVariables)stackComponentsVariables.peek();
		}

		return variables;
	}

	public void removeVariables(UIComponent component) {
	        HashMap components;
                Stack stackComponentsVariables;
                ComponentVariables variables;



                components = (HashMap)component.getAttributes().get( COMPONENT_RENDERER_BASE );

                if ( components != null ) {
	
        	        stackComponentsVariables = (Stack)component.getAttributes().get( this.getClass().getName() );

                	if ( stackComponentsVariables != null ) {
                		if ( !stackComponentsVariables.empty() ) {
                			stackComponentsVariables.pop();
				}
				
				if ( stackComponentsVariables.empty()  ) {
					components.remove( this.getClass().getName() );
				}
			}

			if ( components.isEmpty()  ) {
                                component.getAttributes().remove( COMPONENT_RENDERER_BASE  );
                        }
				
					
                } 

	}
}