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Java > Open Source Codes > org > jboss > ejb > plugins > AbstractInterceptor


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 JavaDoc;
31
32 /**
33  * An abstract base class for container interceptors.
34  *
35  * @author <a HREF="mailto:rickard.oberg@telkel.com">Rickard �berg</a>
36  * @author <a HREF="mailto:jason@planet57.com">Jason Dillon</a>
37  * @author Scott.Stark@jboss.org
38  * @version $Revision: 41271 $
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 JavaDoc
84    {
85       // empty
86 }
87
88    public void start() throws Exception JavaDoc
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 JavaDoc invokeHome(final Invocation mi) throws Exception JavaDoc
104    {
105       // assert mi != null;
106 return getNext().invokeHome(mi);
107    }
108
109    public Object JavaDoc invoke(final Invocation mi) throws Exception JavaDoc
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 JavaDoc e)
124    {
125       Method JavaDoc m = invocation.getMethod();
126       Class JavaDoc[] exceptions = m.getExceptionTypes();
127       boolean isAppException = false;
128       for(int n = 0; isAppException == false && n < exceptions.length; n ++)
129       {
130          Class JavaDoc exType = exceptions[n];
131          isAppException = exType.isInstance(e);
132       }
133       return isAppException;
134    }
135
136    // Protected -----------------------------------------------------
137 }
138
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