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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.jxpath.ri.compiler;
18  
19  import org.apache.commons.jxpath.ri.EvalContext;
20  import org.apache.commons.jxpath.ri.InfoSetUtil;
21  
22  /**
23   * Implementation of {@link Expression} for the operation "+".
24   *
25   * @author Dmitri Plotnikov
26   * @version $Revision: 652845 $ $Date: 2008-05-02 13:46:46 -0400 (Fri, 02 May 2008) $
27   */
28  public class CoreOperationAdd extends CoreOperation {
29  
30      /**
31       * Create a new CoreOperationAdd.
32       * @param args Expression arguments to add together.
33       */
34      public CoreOperationAdd(Expression[] args) {
35          super(args);
36      }
37  
38      public Object computeValue(EvalContext context) {
39          double s = 0.0;
40          for (int i = 0; i < args.length; i++) {
41              s += InfoSetUtil.doubleValue(args[i].computeValue(context));
42          }
43          return new Double(s);
44      }
45  
46      protected int getPrecedence() {
47          return ADD_PRECEDENCE;
48      }
49  
50      protected boolean isSymmetric() {
51          return true;
52      }
53  
54      public String getSymbol() {
55          return "+";
56      }
57  }