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/*
 * Copyright 2014 mango.concurrent.cc
 *
 * The Mango Project 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 cc.concurrent.mango.runtime.parser;

/**
 * @author ash
 */
public class ASTAddExpression extends MathExpression {

    public ASTAddExpression(int i) {
        super(i);
    }

    public ASTAddExpression(Parser p, int i) {
        super(p, i);
    }

    @Override
    protected Object handleSpecial(Object left, Object right) {
        if (left == null) {
            left = "null";
        } else if (right == null) {
            right = "null";
        }
        if (left instanceof String || right instanceof String) {
            return left.toString().concat(right.toString());
        }
        return null;
    }

    @Override
    public Integer perform(Integer left, Integer right) {
        return left + right;
    }

}