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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 * Addition : either integer addition or string concatenation
24 *
25 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26 * @version $Id: ASTAddNode.java,v 1.7 2004/08/24 02:22:12 dion Exp $
27 */
28 public class ASTAddNode extends SimpleNode
29 {
30 public ASTAddNode(int id)
31 {
32 super(id);
33 }
34
35 public ASTAddNode(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 context)
48 throws Exception
49 {
50 Object left = ((SimpleNode) jjtGetChild(0)).value(context);
51 Object right = ((SimpleNode) jjtGetChild(1)).value(context);
52
53
54
55
56 if (left == null && right == null)
57 return new Long(0);
58
59
60
61
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
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80
81
82
83 try
84 {
85 Double l = left == null ? new Double(0) : Coercion.coerceDouble(left);
86 Double r = right == null? new Double(0) : Coercion.coerceDouble(right);
87
88 return new Double(l.doubleValue() + r.doubleValue());
89 }
90 catch( java.lang.NumberFormatException nfe )
91 {
92
93
94
95 return left.toString().concat(right.toString());
96 }
97 }
98
99
100
101
102 try
103 {
104 Long l = left == null ? new Long(0) : Coercion.coerceLong(left);
105 Long r = right == null ? new Long(0) : Coercion.coerceLong(right);
106
107 return new Long(l.longValue() + r.longValue());
108 }
109 catch( java.lang.NumberFormatException nfe )
110 {
111
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113
114 return left.toString().concat(right.toString());
115 }
116 }
117 }