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1   // ========================================================================
2   // Copyright (c) 2009 Mort Bay Consulting Pty. Ltd.
3   // ------------------------------------------------------------------------
4   // All rights reserved. This program and the accompanying materials
5   // are made available under the terms of the Eclipse Public License v1.0
6   // and Apache License v2.0 which accompanies this distribution.
7   // The Eclipse Public License is available at 
8   // http://www.eclipse.org/legal/epl-v10.html
9   // The Apache License v2.0 is available at
10  // http://www.opensource.org/licenses/apache2.0.php
11  // You may elect to redistribute this code under either of these licenses. 
12  // ========================================================================
13  
14  package org.eclipse.jetty.annotations;
15  
16  import java.lang.reflect.Method;
17  import java.lang.reflect.Modifier;
18  
19  import javax.annotation.PostConstruct;
20  
21  import org.eclipse.jetty.annotations.AnnotationIntrospector.AbstractIntrospectableAnnotationHandler;
22  import org.eclipse.jetty.plus.annotation.LifeCycleCallbackCollection;
23  import org.eclipse.jetty.plus.annotation.PostConstructCallback;
24  import org.eclipse.jetty.webapp.WebAppContext;
25  
26  public class PostConstructAnnotationHandler extends AbstractIntrospectableAnnotationHandler
27  {
28      protected WebAppContext _wac;
29      protected LifeCycleCallbackCollection _callbacks;
30  
31      public PostConstructAnnotationHandler (WebAppContext wac)
32      {
33          super(true);
34          _wac = wac;
35          _callbacks = (LifeCycleCallbackCollection)_wac.getAttribute(LifeCycleCallbackCollection.LIFECYCLE_CALLBACK_COLLECTION);
36      }
37  
38  
39      public void doHandle(Class clazz)
40      {  
41          //Check that the PostConstruct is on a class that we're interested in
42          if (Util.isServletType(clazz))
43          {
44              Method[] methods = clazz.getDeclaredMethods();
45              for (int i=0; i<methods.length; i++)
46              {
47                  Method m = (Method)methods[i];
48                  if (m.isAnnotationPresent(PostConstruct.class))
49                  {
50                      if (m.getParameterTypes().length != 0)
51                          throw new IllegalStateException(m+" has parameters");
52                      if (m.getReturnType() != Void.TYPE)
53                          throw new IllegalStateException(m+" is not void");
54                      if (m.getExceptionTypes().length != 0)
55                          throw new IllegalStateException(m+" throws checked exceptions");
56                      if (Modifier.isStatic(m.getModifiers()))
57                          throw new IllegalStateException(m+" is static");
58  
59                      PostConstructCallback callback = new PostConstructCallback();
60                      callback.setTarget(clazz.getName(), m.getName());
61                      _callbacks.add(callback);
62                  }
63              }
64          }
65      }
66  }