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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  
17  package org.apache.commons.jexl.parser;
18  
19  import org.apache.commons.jexl.JexlContext;
20  import org.apache.commons.jexl.util.Coercion;
21  
22  /***
23   *  %
24   *
25   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26   *  @version $Id: ASTModNode.java,v 1.4 2004/02/28 13:45:20 yoavs Exp $
27   */
28  public class ASTModNode extends SimpleNode
29  {
30      public ASTModNode(int id)
31      {
32          super(id);
33      }
34  
35      public ASTModNode(Parser p, int id)
36      {
37          super(p, id);
38      }
39  
40  
41      /*** Accept the visitor. **/
42      public Object jjtAccept(ParserVisitor visitor, Object data)
43      {
44          return visitor.visit(this, data);
45      }
46  
47      public Object value(JexlContext jc)
48          throws Exception
49      {
50          Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
51          Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
52  
53          /*
54           *  the spec says 'and', I think 'or'
55           */
56          if (left == null && right == null)
57              return new Integer(0);
58  
59          /*
60           *  if anything is float, double or string with ( "." | "E" | "e")
61           *  coerce all to doubles and do it
62           */
63          if ( left instanceof Float || left instanceof Double
64              || right instanceof Float || right instanceof Double
65              || (  left instanceof String
66                    && (  ((String) left).indexOf(".") != -1 ||
67                          ((String) left).indexOf("e") != -1 ||
68                          ((String) left).indexOf("E") != -1 )
69                 )
70              || (  right instanceof String
71                    && (  ((String) right).indexOf(".") != -1 ||
72                          ((String) right).indexOf("e") != -1 ||
73                          ((String) right).indexOf("E") != -1 )
74                 )
75              )
76          {
77              Double l = Coercion.coerceDouble(left);
78              Double r = Coercion.coerceDouble(right);
79  
80              /*
81               * catch div/0
82               */
83              if (r.doubleValue() == 0.0)
84                  return new Double(0.0);
85  
86              return new Double(l.doubleValue() % r.doubleValue());
87          }
88  
89          /*
90           * otherwise to longs with thee!
91           */
92  
93          Long l = Coercion.coerceLong(left);
94          Long r = Coercion.coerceLong(right);
95  
96          /*
97           * catch the div/0
98           */
99          if (r.longValue() == 0)
100             return new Long(0);
101 
102         return new Long(l.longValue() % r.longValue());
103     }
104 
105 }