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


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 JavaDoc;
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 JavaDoc invokeHome(final Invocation mi) throws Exception JavaDoc
54    {
55       validateArguments(mi);
56       Object JavaDoc obj = getNext().invokeHome(mi);
57       return validateReturnValue(mi, obj);
58    }
59
60    public Object JavaDoc invoke(final Invocation mi) throws Exception JavaDoc
61    {
62       validateArguments(mi);
63       Object JavaDoc 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 JavaDoc[] params = mi.getArguments();
73          for (int i = 0; i < params.length; i++)
74          {
75             Object JavaDoc obj = params[i];
76             if (obj instanceof TimerHandle JavaDoc)
77                throw new IllegalArgumentException JavaDoc("Cannot pass TimerHandle through remote interface");
78          }
79       }
80    }
81
82    /** Do some validation of the return value */
83    protected Object JavaDoc validateReturnValue(Invocation mi, Object JavaDoc retValue)
84    {
85       if (mi.getType() == InvocationType.REMOTE)
86       {
87          if (retValue instanceof TimerHandle JavaDoc)
88             throw new IllegalArgumentException JavaDoc("Cannot return TimerHandle from remote interface");
89       }
90       return retValue;
91    }
92
93 }
94
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