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This is the master POM file for Sun's Implementation of the JSF 1.2 Specification.
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/*
 * $Id: VariableResolverImpl.java,v 1.35.4.1 2010/05/17 19:51:05 edburns Exp $
 */

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.faces.el;

import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.VariableResolver;
import javax.el.ELException;

import com.sun.faces.util.MessageUtils;

/**
 * 
 * Concrete implementation of VariableResolver.
 * 
 */
@SuppressWarnings("deprecation")
public class VariableResolverImpl extends VariableResolver {

    private VariableResolver delegate;

    // ------------------------------------------- Methods from VariableResolver

    // Specified by javax.faces.el.VariableResolver.resolveVariable()
    public Object resolveVariable(FacesContext context, String name)
            throws EvaluationException {

        if (context == null) {
            String message = MessageUtils.getExceptionMessageString
                (MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "context");
            throw new NullPointerException(message);
        }
        if (name == null) {
            String message = MessageUtils.getExceptionMessageString
                (MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "name");
            throw new NullPointerException(message);
        }

        Object result;

        if (delegate != null) {
            result = delegate.resolveVariable(context, name);
        } else {
            try {
                result = context.getApplication().getELResolver().getValue(context.getELContext(), null, name);
            } catch (ELException elex) {
                throw new EvaluationException(elex);
            }
        }
        return result;

    }


    // ---------------------------------------------------------- Public Methods


    public void setDelegate(VariableResolver delegate) {

        this.delegate = delegate;

    }

    public VariableResolver getDelegate() {
        return this.delegate;
    }
}