    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *     http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.jxpath.ri.compiler;
    018
    019    import org.apache.commons.jxpath.ri.EvalContext;
    020    import org.apache.commons.jxpath.ri.InfoSetUtil;
    021
    022    /**
    023     * Implementation of {@link Expression} for the operation "+".
    024     *
    025     * @author Dmitri Plotnikov
    026     * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
    027     */
    028    public class CoreOperationAdd extends CoreOperation {
    029
    030        /**
    031         * Create a new CoreOperationAdd.
    032         * @param args Expression arguments to add together.
    033         */
    034        public CoreOperationAdd(Expression[] args) {
    035            super(args);
    036        }
    037
    038        public Object computeValue(EvalContext context) {
    039            double s = 0.0;
    040            for (int i = 0; i < args.length; i++) {
    041                s += InfoSetUtil.doubleValue(args[i].computeValue(context));
    042            }
    043            return new Double(s);
    044        }
    045
    046        protected int getPrecedence() {
    047            return ADD_PRECEDENCE;
    048        }
    049
    050        protected boolean isSymmetric() {
    051            return true;
    052        }
    053
    054        public String getSymbol() {
    055            return "+";
    056        }
    057    }