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1   /*
2    * Copyright 2003,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.jexl.parser;
17  
18  import org.apache.commons.jexl.util.Coercion;
19  import org.apache.commons.jexl.JexlContext;
20  
21  /***
22   *  /
23   *
24   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
25   *  @version $Id: ASTDivNode.java,v 1.4 2004/02/28 13:45:20 yoavs Exp $
26   */
27  public class ASTDivNode extends SimpleNode
28  {
29      public ASTDivNode(int id)
30      {
31          super(id);
32      }
33  
34      public ASTDivNode(Parser p, int id)
35      {
36          super(p, id);
37      }
38  
39  
40      /*** Accept the visitor. **/
41      public Object jjtAccept(ParserVisitor visitor, Object data)
42      {
43          return visitor.visit(this, data);
44      }
45  
46         public Object value(JexlContext jc)
47          throws Exception
48      {
49          Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
50          Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
51  
52          /*
53           *  the spec says 'and', I think 'or'
54           */
55          if (left == null && right == null)
56              return new Integer(0);
57  
58          Double l = Coercion.coerceDouble(left);
59          Double r = Coercion.coerceDouble(right);
60  
61          /*
62           * catch div/0
63           */
64          if (r.doubleValue() == 0.0)
65              return new Double(0.0);
66  
67          return new Double(l.doubleValue() / r.doubleValue());
68  
69      }
70  }