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Java > Open Source Codes > org > jboss > beans > metadata > plugins > ThisValueMetaData


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.beans.metadata.plugins;
23
24 import org.jboss.beans.metadata.spi.MetaDataVisitor;
25 import org.jboss.dependency.plugins.AbstractDependencyItem;
26 import org.jboss.dependency.spi.ControllerContext;
27 import org.jboss.dependency.spi.ControllerState;
28 import org.jboss.dependency.spi.DependencyItem;
29 import org.jboss.kernel.spi.dependency.KernelController;
30 import org.jboss.kernel.spi.dependency.KernelControllerContext;
31 import org.jboss.reflect.spi.TypeInfo;
32
33 /**
34  * Dependency value.
35  *
36  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
37  * @version $Revision: 57306 $
38  */
39 public class ThisValueMetaData extends AbstractValueMetaData
40 {
41    /** The controller */
42    protected KernelController controller;
43
44    /**
45     * Create a new dependency value
46     */
47    public ThisValueMetaData()
48    {
49    }
50    
51    public Object JavaDoc getValue(TypeInfo info, ClassLoader JavaDoc cl) throws Throwable JavaDoc
52    {
53       ControllerContext context = controller.getContext(value, ControllerState.INSTANTIATED);
54       if (context == null)
55          throw new Error JavaDoc("Could not deference this " + this);
56       return context.getTarget();
57    }
58
59    public void initialVisit(MetaDataVisitor visitor)
60    {
61       KernelControllerContext controllerContext = visitor.getControllerContext();
62       controller = (KernelController) controllerContext.getController();
63       value = controllerContext.getName();
64       ControllerState whenRequired = visitor.getContextState();
65
66       DependencyItem item = new AbstractDependencyItem(value, value, whenRequired, ControllerState.INSTANTIATED);
67       visitor.addDependency(item);
68
69       super.initialVisit(visitor);
70    }
71 }
72
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