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 import org.jboss.invocation.Invocation;
25 import org.jboss.invocation.InvocationType;
26
27 import javax.ejb.TimerHandle;
28
29 /**
30 * This Interceptor validates the incomming arguments and the return value of the call.
31 *
32 * Here is the place where you want to make sure that local object don't pass through
33 * the remote interface.
34 *
35 * @author Thomas.Diesler@jboss.org
36 * @version $Revision: 37459 $
37 */
38 public class CallValidationInterceptor
39 extends AbstractInterceptor
40 {
41 // Constants -----------------------------------------------------
42
43 // Attributes ----------------------------------------------------
44
45 // Static --------------------------------------------------------
46
47 // Constructors --------------------------------------------------
48
49 // Public --------------------------------------------------------
50
51 // Interceptor implementation --------------------------------------
52
53 public Object invokeHome(final Invocation mi) throws Exception
54 {
55 validateArguments(mi);
56 Object obj = getNext().invokeHome(mi);
57 return validateReturnValue(mi, obj);
58 }
59
60 public Object invoke(final Invocation mi) throws Exception
61 {
62 validateArguments(mi);
63 Object obj = getNext().invoke(mi);
64 return validateReturnValue(mi, obj);
65 }
66
67 /** Do some validation of the incoming parameters */
68 protected void validateArguments(Invocation mi)
69 {
70 if (mi.getType() == InvocationType.REMOTE)
71 {
72 Object[] params = mi.getArguments();
73 for (int i = 0; i < params.length; i++)
74 {
75 Object obj = params[i];
76 if (obj instanceof TimerHandle)
77 throw new IllegalArgumentException("Cannot pass TimerHandle through remote interface");
78 }
79 }
80 }
81
82 /** Do some validation of the return value */
83 protected Object validateReturnValue(Invocation mi, Object retValue)
84 {
85 if (mi.getType() == InvocationType.REMOTE)
86 {
87 if (retValue instanceof TimerHandle)
88 throw new IllegalArgumentException("Cannot return TimerHandle from remote interface");
89 }
90 return retValue;
91 }
92
93 }
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