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org.apache.commons.jexl.util.PropertyExecutor |
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1 | /* |
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2 | * Copyright 2000-2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jexl.util; |
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17 | ||
18 | import java.lang.reflect.InvocationTargetException; |
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19 | ||
20 | import org.apache.commons.jexl.util.introspection.Introspector; |
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21 | import org.apache.commons.logging.Log; |
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22 | ||
23 | /** |
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24 | * Returned the value of object property when executed. |
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25 | */ |
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26 | public class PropertyExecutor extends AbstractExecutor |
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27 | { |
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28 | 198 | protected Introspector introspector = null; |
29 | ||
30 | 198 | protected String methodUsed = null; |
31 | ||
32 | public PropertyExecutor(Log r, Introspector ispctr, |
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33 | Class clazz, String property) |
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34 | 198 | { |
35 | 198 | rlog = r; |
36 | 198 | introspector = ispctr; |
37 | ||
38 | 198 | discover(clazz, property); |
39 | 198 | } |
40 | ||
41 | protected void discover(Class clazz, String property) |
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42 | { |
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43 | /* |
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44 | * this is gross and linear, but it keeps it straightforward. |
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45 | */ |
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46 | ||
47 | try |
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48 | { |
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49 | char c; |
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50 | StringBuffer sb; |
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51 | ||
52 | 180 | Object[] params = { }; |
53 | ||
54 | /* |
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55 | * start with get<property> |
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56 | * this leaves the property name |
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57 | * as is... |
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58 | */ |
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59 | 180 | sb = new StringBuffer("get"); |
60 | 180 | sb.append(property); |
61 | ||
62 | 180 | methodUsed = sb.toString(); |
63 | ||
64 | 180 | method = introspector.getMethod(clazz, methodUsed, params); |
65 | ||
66 | 180 | if (method != null) |
67 | 0 | return; |
68 | ||
69 | /* |
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70 | * now the convenience, flip the 1st character |
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71 | */ |
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72 | ||
73 | 180 | sb = new StringBuffer("get"); |
74 | 180 | sb.append(property); |
75 | ||
76 | 180 | c = sb.charAt(3); |
77 | ||
78 | 180 | if (Character.isLowerCase(c)) |
79 | { |
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80 | 180 | sb.setCharAt(3, Character.toUpperCase(c)); |
81 | } |
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82 | else |
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83 | { |
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84 | 0 | sb.setCharAt(3, Character.toLowerCase(c)); |
85 | } |
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86 | ||
87 | 180 | methodUsed = sb.toString(); |
88 | 180 | method = introspector.getMethod(clazz, methodUsed, params); |
89 | ||
90 | 180 | if (method != null) |
91 | 162 | return; |
92 | ||
93 | 16 | } |
94 | catch(Exception e) |
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95 | { |
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96 | 0 | rlog.error("PROGRAMMER ERROR : PropertyExector() : " + e ); |
97 | 2 | } |
98 | 18 | } |
99 | ||
100 | ||
101 | /** |
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102 | * Execute method against context. |
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103 | */ |
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104 | public Object execute(Object o) |
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105 | throws IllegalAccessException, InvocationTargetException |
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106 | { |
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107 | 180 | if (method == null) |
108 | 0 | return null; |
109 | ||
110 | 180 | return method.invoke(o, null); |
111 | } |
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112 | } |
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113 | ||
114 |
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