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Java > Open Source Codes > org > jboss > kernel > plugins > registry > AbstractKernelRegistry


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.kernel.plugins.registry;
23
24 import java.util.Iterator JavaDoc;
25 import java.util.List JavaDoc;
26 import java.util.ListIterator JavaDoc;
27
28 import org.jboss.kernel.plugins.AbstractKernelObject;
29 import org.jboss.kernel.spi.registry.KernelRegistry;
30 import org.jboss.kernel.spi.registry.KernelRegistryEntry;
31 import org.jboss.kernel.spi.registry.KernelRegistryEntryNotFoundException;
32 import org.jboss.kernel.spi.registry.KernelRegistryPlugin;
33 import org.jboss.util.collection.CollectionsFactory;
34
35 /**
36  * Abstract Kernel registry.
37  *
38  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
39  * @author <a HREF="mailto:les.hazlewood@jboss.org">Les A. Hazlewood</a>
40  * @version $Revision: 45764 $
41  */
42 public abstract class AbstractKernelRegistry extends AbstractKernelObject implements KernelRegistry
43 {
44    /** The registry factories */
45    protected List JavaDoc<KernelRegistryPlugin> factories = CollectionsFactory.createCopyOnWriteList();
46
47    /**
48     * Create an abstract kernel registry
49     *
50     * @throws Exception for any error
51     */
52    public AbstractKernelRegistry() throws Exception JavaDoc
53    {
54    }
55
56    /**
57     * Add a kernel registry factory
58     *
59     * @param factory the factory to add
60     */
61    public void addKernelRegistryFactory(KernelRegistryPlugin factory)
62    {
63       factories.add(factory);
64       if (log.isTraceEnabled())
65          log.trace("Registry " + this + " added registry factory " + factory);
66    }
67
68    /**
69     * Remove a kernel registry factory
70     *
71     * @param factory the factory to remove
72     */
73    public void removeKernelRegistryFactory(KernelRegistryPlugin factory)
74    {
75       factories.remove(factory);
76       if (log.isTraceEnabled())
77          log.trace("Registry " + this + " removed registry factory " + factory);
78    }
79
80    public KernelRegistryEntry getEntry(Object JavaDoc name)
81    {
82       for (ListIterator JavaDoc i = factories.listIterator(); i.hasNext();)
83       {
84          KernelRegistryPlugin factory = (KernelRegistryPlugin) i.next();
85          KernelRegistryEntry entry = factory.getEntry(name);
86          if (entry != null)
87             return entry;
88       }
89       throw new KernelRegistryEntryNotFoundException("Entry not found with name: " + name);
90    }
91
92    public boolean containsEntry(Object JavaDoc name)
93    {
94       Iterator JavaDoc i = factories.iterator();
95       while (i.hasNext())
96       {
97          KernelRegistryPlugin factory = (KernelRegistryPlugin) i.next();
98          KernelRegistryEntry entry = factory.getEntry(name);
99          if (entry != null)
100             return true;
101       }
102       return false;
103    }
104 }
105
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