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Java > Open Source Codes > org > jboss > aop > microcontainer > integration > AOPDependencyBuilder


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.aop.microcontainer.integration;
23
24 import java.util.List JavaDoc;
25
26 import org.jboss.classadapter.plugins.dependency.AbstractDependencyBuilder;
27 import org.jboss.classadapter.spi.ClassAdapter;
28 import org.jboss.classadapter.spi.DependencyBuilder;
29
30 /**
31  * The existence of this class is the signal to the kernel that we want to use the aop-mc integration.
32  * When deployed in jboss the AOPDependencyBuilderDelegate will be deployed as part of the AspectDeployer,
33  * so we use the "normal" dependecy builder until that has been deployed
34
35  * @author <a HREF="kabir.khan@jboss.com">Kabir Khan</a>
36  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
37  * @version $Revision: 58238 $
38  */
39 public class AOPDependencyBuilder extends AbstractDependencyBuilder
40 {
41    DependencyBuilder delegate;
42    
43    public List JavaDoc getDependencies(ClassAdapter classAdapter)
44    {
45       DependencyBuilder builder = getDependencyBuilderDelegate(classAdapter);
46       if (builder == null)
47       {
48          return super.getDependencies(classAdapter);
49       }
50       return delegate.getDependencies(classAdapter);
51    }
52    
53    private synchronized DependencyBuilder getDependencyBuilderDelegate(ClassAdapter classAdapter)
54    {
55       if (delegate != null)
56       {
57          return delegate;
58       }
59       
60       Class JavaDoc clazz = AOPDeployedChecker.getClassIfExists(
61             classAdapter.getClassLoader(),
62             "org.jboss.aop.microcontainer.integration.AOPDependencyBuilderDelegate");
63       
64       if (clazz == null)
65       {
66          return null;
67       }
68       
69       try
70       {
71          delegate = (DependencyBuilder)clazz.newInstance();
72       }
73       catch (Exception JavaDoc e)
74       {
75          throw new RuntimeException JavaDoc("Error instantiating AOPDependencyBuilderDelegate", e);
76       }
77       
78       return delegate;
79    }
80 }
81
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