%line | %branch | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
org.apache.commons.jexl.parser.ASTSizeFunction |
|
|
1 | /* |
|
2 | * Copyright 2002-2004 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.JexlContext; |
|
19 | import org.apache.commons.jexl.util.Introspector; |
|
20 | import org.apache.commons.jexl.util.introspection.Info; |
|
21 | import org.apache.commons.jexl.util.introspection.VelMethod; |
|
22 | ||
23 | import java.util.List; |
|
24 | import java.util.Map; |
|
25 | import java.util.Set; |
|
26 | import java.lang.reflect.Array; |
|
27 | ||
28 | /** |
|
29 | * generalized size() function for all classes we can think of |
|
30 | * |
|
31 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
|
32 | * @author <a href="hw@kremvax.net">Mark H. Wilkinson</a> |
|
33 | * @version $Id: ASTSizeFunction.java,v 1.6 2004/08/15 16:01:12 dion Exp $ |
|
34 | */ |
|
35 | public class ASTSizeFunction extends SimpleNode |
|
36 | { |
|
37 | public ASTSizeFunction(int id) |
|
38 | { |
|
39 | 0 | super(id); |
40 | 0 | } |
41 | ||
42 | public ASTSizeFunction(Parser p, int id) |
|
43 | { |
|
44 | 186 | super(p, id); |
45 | 186 | } |
46 | ||
47 | ||
48 | /** Accept the visitor. **/ |
|
49 | public Object jjtAccept(ParserVisitor visitor, Object data) |
|
50 | { |
|
51 | 0 | return visitor.visit(this, data); |
52 | } |
|
53 | ||
54 | ||
55 | public Object value(JexlContext jc) |
|
56 | throws Exception |
|
57 | { |
|
58 | 186 | SimpleNode arg = (SimpleNode) jjtGetChild(0); |
59 | ||
60 | 186 | Object val = arg.value(jc); |
61 | ||
62 | 186 | if (val == null) |
63 | { |
|
64 | 0 | throw new Exception("size() : null arg"); |
65 | } |
|
66 | ||
67 | 186 | return new Integer(ASTSizeFunction.sizeOf(val)); |
68 | } |
|
69 | ||
70 | public static int sizeOf(Object val) |
|
71 | throws Exception |
|
72 | { |
|
73 | 291 | if (val instanceof List) |
74 | { |
|
75 | 105 | return ((List)val).size(); |
76 | } |
|
77 | 186 | else if (val.getClass().isArray()) |
78 | { |
|
79 | 15 | return Array.getLength(val); |
80 | } |
|
81 | 171 | else if (val instanceof Map) |
82 | { |
|
83 | 30 | return ((Map)val).size(); |
84 | } |
|
85 | 141 | else if (val instanceof String) |
86 | { |
|
87 | 81 | return ((String)val).length(); |
88 | } |
|
89 | 60 | else if (val instanceof Set) |
90 | { |
|
91 | 30 | return ((Set)val).size(); |
92 | } |
|
93 | else { |
|
94 | // check if there is a size method on the object that returns an integer |
|
95 | // and if so, just use it |
|
96 | 30 | Object[] params = new Object[0]; |
97 | 30 | Info velInfo = new Info("",1,1); |
98 | 30 | VelMethod vm = Introspector.getUberspect().getMethod(val, "size", params, velInfo); |
99 | 30 | if (vm != null && vm.getReturnType() == Integer.TYPE) |
100 | { |
|
101 | 30 | Integer result = (Integer)vm.invoke(val, params); |
102 | 30 | return result.intValue(); |
103 | } |
|
104 | else |
|
105 | { |
|
106 | 0 | throw new Exception("size() : unknown type : " + val.getClass()); |
107 | } |
|
108 | } |
|
109 | } |
|
110 | ||
111 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |