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Java > Open Source Codes > org > apache > commons > jexl > util > BooleanPropertyExecutor


1 /*
2  * Copyright 2000-2001,2004 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
17 package org.apache.commons.jexl.util;
18
19 import org.apache.commons.logging.Log;
20 /**
21  * Handles discovery and valuation of a
22  * boolean object property, of the
23  * form public boolean is<Property> when executed.
24  *
25  * We do this separately as to preserve the current
26  * quasi-broken semantics of get <as is property>
27  * get<flip 1st char> get("property") and now followed
28  * by is<Property>.
29  *
30  * @since 1.0
31  * @author <a HREF="geirm@apache.org">Geir Magnusson Jr.</a>
32  * @version $Id: BooleanPropertyExecutor.java 398171 2006-04-29 14:57:29Z dion $
33  */
34 public class BooleanPropertyExecutor extends PropertyExecutor {
35
36     /**
37      * Constructor.
38      *
39      * @param rlog The instance log.
40      * @param is The JEXL introspector.
41      * @param clazz The class being analyzed.
42      * @param property The boolean property.
43      */
44     public BooleanPropertyExecutor(Log rlog,
45         org.apache.commons.jexl.util.introspection.Introspector is,
46         Class JavaDoc clazz, String JavaDoc property) {
47             super(rlog, is, clazz, property);
48     }
49
50     /**
51      * Locate the getter method for this boolean property.
52      *
53      * @param clazz The class being analyzed.
54      * @param property Name of boolean property.
55      */
56     protected void discover(Class JavaDoc clazz, String JavaDoc property) {
57         try {
58             char c;
59             StringBuffer JavaDoc sb;
60
61             Object JavaDoc[] params = {};
62
63             /*
64              * now look for a boolean isFoo
65              */
66
67             sb = new StringBuffer JavaDoc("is");
68             sb.append(property);
69
70             c = sb.charAt(2);
71
72             if (Character.isLowerCase(c)) {
73                 sb.setCharAt(2, Character.toUpperCase(c));
74             }
75
76             methodUsed = sb.toString();
77             method = introspector.getMethod(clazz, methodUsed, params);
78
79             if (method != null) {
80                 /*
81                  * now, this has to return a boolean
82                  */
83
84                 if (method.getReturnType() == Boolean.TYPE) {
85                     return;
86                 }
87
88                 method = null;
89             }
90         } catch (Exception JavaDoc e) {
91             rlog.error("PROGRAMMER ERROR : BooleanPropertyExector() : " + e);
92         }
93     }
94 }
95
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