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