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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.util.List;
17  
18  import org.eclipse.jetty.annotations.AnnotationParser.AnnotationHandler;
19  import org.eclipse.jetty.annotations.AnnotationParser.Value;
20  import org.eclipse.jetty.plus.annotation.LifeCycleCallbackCollection;
21  import org.eclipse.jetty.plus.annotation.PostConstructCallback;
22  import org.eclipse.jetty.util.log.Log;
23  import org.eclipse.jetty.webapp.WebAppContext;
24  
25  public class PostConstructAnnotationHandler implements AnnotationHandler
26  {
27      protected WebAppContext _wac;
28      protected LifeCycleCallbackCollection _callbacks;
29  
30      public PostConstructAnnotationHandler (WebAppContext wac)
31      {
32          _wac = wac;
33          _callbacks = (LifeCycleCallbackCollection)_wac.getAttribute(LifeCycleCallbackCollection.LIFECYCLE_CALLBACK_COLLECTION);
34      }
35  
36  
37      public void handleClass(String className, int version, int access, String signature, String superName, String[] interfaces, String annotation,
38                              List<Value> values)
39      {
40         Log.warn ("@PostConstruct annotation not applicable to classes: "+className);
41      }
42  
43      public void handleField(String className, String fieldName, int access, String fieldType, String signature, Object value, String annotation,
44                              List<Value> values)
45      {
46        Log.warn("@PostConstruct annotation not applicable to fields: "+className+"."+fieldName);  
47      }
48  
49      public void handleMethod(String className, String methodName, int access, String desc, String signature, String[] exceptions, String annotation,
50                               List<Value> values)
51      {  
52          try
53          {
54              org.objectweb.asm.Type[] args = org.objectweb.asm.Type.getArgumentTypes(desc);      
55           
56              if (args.length != 0)
57              {
58                  Log.warn("Skipping PostConstruct annotation on "+className+"."+methodName+": has parameters");
59                  return;
60              }
61              if (org.objectweb.asm.Type.getReturnType(desc) != org.objectweb.asm.Type.VOID_TYPE)
62              {
63                  Log.warn("Skipping PostConstruct annotation on "+className+"."+methodName+": is not void");
64                  return;
65              }
66              
67              if (exceptions != null && exceptions.length != 0)
68              {
69                  Log.warn("Skipping PostConstruct annotation on "+className+"."+methodName+": throws checked exceptions");
70                  return;
71              }
72              
73              if ((access & org.objectweb.asm.Opcodes.ACC_STATIC) > 0)
74              {
75                  Log.warn("Skipping PostConstruct annotation on "+className+"."+methodName+": is static");
76                  return;
77              }
78  
79              PostConstructCallback callback = new PostConstructCallback();
80              callback.setTarget(className, methodName);
81              _callbacks.add(callback);
82          }
83          catch (Exception e)
84          {
85              Log.warn(e);
86          }
87      }
88  
89  }