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Java > Open Source Codes > org > jboss > kernel > plugins > util > KernelLocator


1 /*
2  * JBoss, Home of Professional Open Source
3  * Copyright 2006, Red Hat Middleware LLC, and individual contributors
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.kernel.plugins.util;
23
24 import org.jboss.kernel.Kernel;
25 import org.jboss.kernel.spi.dependency.KernelControllerContext;
26 import org.jboss.kernel.spi.dependency.KernelControllerContextAware;
27
28 /**
29  * A simple singleton that provides access to the Kernel the KernelLocator
30  * is associated with.
31  *
32  * @author Scott.Stark@jboss.org
33  * @version $Revision:$
34  */
35 public class KernelLocator implements KernelControllerContextAware
36 {
37    private static Kernel kernel;
38    private static final KernelLocatorPermission GET_KERNEL = new KernelLocatorPermission("kernel");
39
40    public void setKernelControllerContext(KernelControllerContext context)
41       throws Exception JavaDoc
42    {
43       KernelLocator.kernel = context.getKernel();
44    }
45
46    public void unsetKernelControllerContext(KernelControllerContext context)
47       throws Exception JavaDoc
48    {
49       KernelLocator.kernel = null;
50    }
51
52    public static Kernel getKernel()
53    {
54       SecurityManager JavaDoc sm = System.getSecurityManager();
55       if (sm != null)
56          sm.checkPermission(GET_KERNEL);
57
58       return kernel;
59    }
60
61 }
62
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