    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 CoreOperationMultiply extends CoreOperation {
    029
    030        /**
    031         * Create a new CoreOperationMultiply.
    032         * @param arg1 factor 1
    033         * @param arg2 factor 2
    034         */
    035        public CoreOperationMultiply(Expression arg1, Expression arg2) {
    036            super(new Expression[] { arg1, arg2 });
    037        }
    038
    039        public Object computeValue(EvalContext context) {
    040            double l = InfoSetUtil.doubleValue(args[0].computeValue(context));
    041            double r = InfoSetUtil.doubleValue(args[1].computeValue(context));
    042            return new Double(l * r);
    043        }
    044
    045        protected int getPrecedence() {
    046            return MULTIPLY_PRECEDENCE;
    047        }
    048
    049        protected boolean isSymmetric() {
    050            return true;
    051        }
    052
    053        public String getSymbol() {
    054            return "*";
    055        }
    056    }