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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 398180 2006-04-29 15:40:35Z dion $
27 */
28 public class ASTAddNode extends SimpleNode {
29 /***
30 * Create the node given an id.
31 *
32 * @param id node id.
33 */
34 public ASTAddNode(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 ASTAddNode(Parser p, int id) {
45 super(p, id);
46 }
47
48
49 /***
50 * {@inheritDoc}
51 */
52 public Object jjtAccept(ParserVisitor visitor, Object data) {
53 return visitor.visit(this, data);
54 }
55
56 /***
57 * {@inheritDoc}
58 */
59 public Object value(JexlContext context) throws Exception {
60 Object left = ((SimpleNode) jjtGetChild(0)).value(context);
61 Object right = ((SimpleNode) jjtGetChild(1)).value(context);
62
63
64
65
66 if (left == null && right == null) {
67 return new Long(0);
68 }
69
70
71
72
73
74 if (left instanceof Float || left instanceof Double
75 || right instanceof Float || right instanceof Double
76 || (left instanceof String
77 && (((String) left).indexOf(".") != -1
78 || ((String) left).indexOf("e") != -1
79 || ((String) left).indexOf("E") != -1)
80 )
81 || (right instanceof String
82 && (((String) right).indexOf(".") != -1
83 || ((String) right).indexOf("e") != -1
84 || ((String) right).indexOf("E") != -1)
85 )
86 ) {
87
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91
92
93 try {
94 Double l = Coercion.coerceDouble(left);
95 Double r = Coercion.coerceDouble(right);
96 return new Double(l.doubleValue() + r.doubleValue());
97 } catch (java.lang.NumberFormatException nfe) {
98
99
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101 return left.toString().concat(right.toString());
102 }
103 }
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106
107
108 try {
109 Long l = Coercion.coerceLong(left);
110 Long r = Coercion.coerceLong(right);
111 return new Long(l.longValue() + r.longValue());
112 } catch (java.lang.NumberFormatException nfe) {
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116 return left.toString().concat(right.toString());
117 }
118 }
119 }