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Java > Open Source Codes > org > apache > velocity > runtime > parser > node > BooleanPropertyExecutor


1 package org.apache.velocity.runtime.parser.node;
2 /*
3  * Copyright 2000-2001,2004 The Apache Software Foundation.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import org.apache.velocity.util.introspection.Introspector;
19
20 import org.apache.velocity.runtime.RuntimeLogger;
21
22 /**
23  * Handles discovery and valuation of a
24  * boolean object property, of the
25  * form public boolean is<property> when executed.
26  *
27  * We do this separately as to preserve the current
28  * quasi-broken semantics of get<as is property>
29  * get< flip 1st char> get("property") and now followed
30  * by is<Property>
31  *
32  * @author <a HREF="geirm@apache.org">Geir Magnusson Jr.</a>
33  * @version $Id: BooleanPropertyExecutor.java,v 1.3.4.1 2004/03/03 23:22:59 geirm Exp $
34  */
35 public class BooleanPropertyExecutor extends PropertyExecutor
36 {
37     public BooleanPropertyExecutor(RuntimeLogger rlog, Introspector is, Class JavaDoc clazz, String JavaDoc property)
38     {
39         super(rlog, is, clazz, property);
40     }
41
42     protected void discover(Class JavaDoc clazz, String JavaDoc property)
43     {
44         try
45         {
46             char c;
47             StringBuffer JavaDoc sb;
48
49             Object JavaDoc[] params = { };
50
51             /*
52              * now look for a boolean isFoo
53              */
54
55             sb = new StringBuffer JavaDoc("is");
56             sb.append(property);
57
58             c = sb.charAt(2);
59
60             if (Character.isLowerCase(c))
61             {
62                 sb.setCharAt(2, Character.toUpperCase(c));
63             }
64
65             methodUsed = sb.toString();
66             method = introspector.getMethod(clazz, methodUsed, params);
67
68             if (method != null)
69             {
70                 /*
71                  * now, this has to return a boolean
72                  */
73
74                 if (method.getReturnType() == Boolean.TYPE)
75                     return;
76
77                 method = null;
78             }
79         }
80         catch(Exception JavaDoc e)
81         {
82             rlog.error("PROGRAMMER ERROR : BooleanPropertyExector() : " + e);
83         }
84     }
85 }
86
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