1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.ejb.plugins;
23
24
25 import org.jboss.ejb.Container;
26 import org.jboss.ejb.Interceptor;
27 import org.jboss.invocation.Invocation;
28 import org.jboss.logging.Logger;
29
30 import java.lang.reflect.Method;
31
32 /**
33 * An abstract base class for container interceptors.
34 *
35 * @author <a href="mailto:rickard.oberg@telkel.com">Rickard Oberg</a>
36 * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
37 * @author Scott.Stark@jboss.org
38 * @version $Revision: 66439 $
39 */
40 public abstract class AbstractInterceptor
41 implements Interceptor
42 {
43 // Constants -----------------------------------------------------
44
45 // Attributes ----------------------------------------------------
46
47 /** The next interceptor in the chain. */
48 protected Interceptor nextInterceptor;
49 /** Logging instance */
50 protected Logger log = Logger.getLogger(this.getClass());
51 /** The container the interceptor is associated with */
52 protected Container container;
53
54 // Static --------------------------------------------------------
55
56 // Constructors --------------------------------------------------
57
58 // Public --------------------------------------------------------
59
60 // Interceptor implementation ------------------------------------
61
62 public void setContainer(Container container)
63 {
64 this.container = container;
65 }
66
67 public Container getContainer()
68 {
69 return container;
70 }
71
72 public void setNext(final Interceptor interceptor)
73 {
74 // assert interceptor != null
75 nextInterceptor = interceptor;
76 }
77
78 public Interceptor getNext()
79 {
80 return nextInterceptor;
81 }
82
83 public void create() throws Exception
84 {
85 // empty
86 }
87
88 public void start() throws Exception
89 {
90 // empty
91 }
92
93 public void stop()
94 {
95 // empty
96 }
97
98 public void destroy()
99 {
100 // empty
101 }
102
103 public Object invokeHome(final Invocation mi) throws Exception
104 {
105 // assert mi != null;
106 return getNext().invokeHome(mi);
107 }
108
109 public Object invoke(final Invocation mi) throws Exception
110 {
111 // assert mi != null;
112 return getNext().invoke(mi);
113 }
114
115 /**
116 See if the given exception e is compatible with an exception declared
117 as thrown by the invocation method.
118
119 @param invocation - the current invocation
120 @param e - the exception thrown by the invocation
121 @return true if e is a declared exception, false otherwise
122 */
123 public boolean isAppException(Invocation invocation, Throwable e)
124 {
125 Method m = invocation.getMethod();
126 Class[] exceptions = m.getExceptionTypes();
127 boolean isAppException = false;
128 for(int n = 0; isAppException == false && n < exceptions.length; n ++)
129 {
130 Class exType = exceptions[n];
131 isAppException = exType.isInstance(e);
132 }
133 return isAppException;
134 }
135
136 // Protected -----------------------------------------------------
137 }
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