/*
 * Copyright 2002,2004 The Apache Software Foundation.
 * 
 * Licensed 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.commons.jexl.parser;

import org.apache.commons.jexl.JexlContext;

/**
 *  Simple identifier -
 *     $foo  or $foo.bar (both parts are identifiers...)
 *
 *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 *  @version $Id: ASTIdentifier.java,v 1.6 2004/02/28 13:45:20 yoavs Exp $
 */
public class ASTIdentifier extends SimpleNode
{
    protected String val;

    public ASTIdentifier(int id)
    {
        super(id);
    }

    public ASTIdentifier(Parser p, int id)
    {
        super(p, id);
    }

    /** Accept the visitor. **/
    public Object jjtAccept(ParserVisitor visitor, Object data)
    {
        return visitor.visit(this, data);
    }


    public Object value(JexlContext jc)
        throws Exception
    {
        return jc.getVars().get(val);
    }

    /**
     *  returns the value of itself applied to the object.
     *   We assume that an identifier can be gotten via a get(String)
     */
    public Object execute(Object obj, JexlContext jc)
        throws Exception
    {
        return ASTArrayAccess.evaluateExpr(obj, val);
    }

    public String getIdentifierString()
    {
        return val;
    }
}