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1   /*
2    * Copyright 2003-2006 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   * % (mod).
24   * 
25   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26   * @version $Id: ASTModNode.java 398206 2006-04-29 16:51:38Z dion $
27   */
28  public class ASTModNode extends SimpleNode {
29      /***
30       * Create the node given an id.
31       * 
32       * @param id node id.
33       */
34      public ASTModNode(int id) {
35          super(id);
36      }
37  
38      /***
39       * Create a node with the given parser and id.
40       * 
41       * @param p a parser.
42       * @param id node id.
43       */
44      public ASTModNode(Parser p, int id) {
45          super(p, id);
46      }
47  
48      /*** {@inheritDoc} */
49      public Object jjtAccept(ParserVisitor visitor, Object data) {
50          return visitor.visit(this, data);
51      }
52  
53      /*** {@inheritDoc} */
54      public Object value(JexlContext jc) throws Exception {
55          Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
56          Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
57  
58          /*
59           * the spec says 'and', I think 'or'
60           */
61          if (left == null && right == null) {
62              return new Byte((byte) 0);
63          }
64  
65          /*
66           * if anything is float, double or string with ( "." | "E" | "e") coerce
67           * all to doubles and do it
68           */
69          if (left instanceof Float
70              || left instanceof Double
71              || right instanceof Float
72              || right instanceof Double
73              || (left instanceof String 
74                  && (((String) left).indexOf(".") != -1 
75                      || ((String) left).indexOf("e") != -1 
76                      || ((String) left).indexOf("E") != -1))
77              || (right instanceof String 
78                  && (((String) right).indexOf(".") != -1 
79                      || ((String) right).indexOf("e") != -1 
80                      || ((String) right).indexOf("E") != -1))) {
81              Double l = Coercion.coerceDouble(left);
82              Double r = Coercion.coerceDouble(right);
83  
84              /*
85               * catch div/0
86               */
87              if (r.doubleValue() == 0.0) {
88                  return new Double(0.0);
89              }
90  
91              return new Double(l.doubleValue() % r.doubleValue());
92          }
93  
94          /*
95           * otherwise to longs with thee!
96           */
97  
98          Long l = Coercion.coerceLong(left);
99          Long r = Coercion.coerceLong(right);
100 
101         /*
102          * catch the div/0
103          */
104         if (r.longValue() == 0) {
105             return new Long(0);
106         }
107 
108         return new Long(l.longValue() % r.longValue());
109     }
110 
111 }