JellyBeanTag


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  
17  package org.apache.commons.jelly.tags.define;
18  
19  import java.lang.reflect.Method  ;
20  
21  import org.apache.commons.beanutils.MethodUtils;
22  
23  import org.apache.commons.logging.Log;
24  import org.apache.commons.logging.LogFactory;
25  
26  
27  /**
28   * Binds a Java bean to the given named Jelly tag so that the attributes of
29   * the tag set the bean properties. After the body of this tag is invoked
30   * then the beans invoke() method will be called, if the bean has one.
31   *
32   * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
33   * @version $Revision: 155420 $
34   */
35  public class JellyBeanTag extends BeanTag {
36  
37      /** The Log to which logging calls will be made. */
38      private static final Log log = LogFactory.getLog(JellyBeanTag.class);
39  
40      /** Empty parameter types for Method lookup */
41      private static final Class  [] emptyParamTypes = {};
42  
43      /** the name of the method to invoke on the bean */
44      private String   method;
45  
46      // Properties
47      //-------------------------------------------------------------------------
48  
49      /**
50       * @return the method name to use, which defaults to 'run' for Runnable
51       * objects
52       */
53      public String   getMethod() {
54          if ( method == null ) {
55              return "run";
56          }
57          return method;
58      }
59  
60      /**
61       * Sets the name of the method to invoke on the bean.
62       * This defaults to "run" so that Runnable objects can be
63       * invoked, but this property can be set to whatever is required,
64       * such as "execute" or "invoke"
65       */
66      public void setMethod(String   method) {
67          this.method = method;
68      }
69  
70  
71      // Implementation methods
72      //-------------------------------------------------------------------------
73  
74      protected Method   getInvokeMethod( Class   theClass ) {
75          Method   invokeMethod =
76              MethodUtils.getAccessibleMethod(
77                  theClass,
78                  getMethod(),
79                  emptyParamTypes);
80  
81          if ( invokeMethod == null ) {
82          }
83          return invokeMethod;
84      }
85  }
86
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