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package org.apache.velocity.runtime.parser.node;

/*
 * 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.    
 */

import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.runtime.parser.Parser;

/**
 * Handles number addition of nodes.


 *
 * Please look at the Parser.jjt file which is
 * what controls the generation of this class.
 *
 * @author Will Glass-Husain
 * @author Peter Romianowski
 * @author Jason van Zyl
 * @author Geir Magnusson Jr.
 * @version $Id: ASTAddNode.java 712887 2008-11-11 00:27:50Z nbubna $
 */
public class ASTAddNode extends ASTMathNode
{
    /**
     * @param id
     */
    public ASTAddNode(int id)
    {
        super(id);
    }

    /**
     * @param p
     * @param id
     */
    public ASTAddNode(Parser p, int id)
    {
        super(p, id);
    }

    //@Override
    protected Object handleSpecial(Object left, Object right, InternalContextAdapter context)
    {
        /*
         * shall we try for strings?
         */
        if (left instanceof String || right instanceof String)
        {
            if (left == null)
            {
                left = jjtGetChild(0).literal();
            }
            else if (right == null)
            {
                right = jjtGetChild(1).literal();
            }
            return left.toString().concat(right.toString());
        }
        return null;
    }

    public Number perform(Number left, Number right, InternalContextAdapter context)
    {
        return MathUtils.add(left, right);
    }

}