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    }