/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
*
* Arjuna Technologies Ltd.
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: StateViewersRepository.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.tools.objectstorebrowser.stateviewers;
import com.arjuna.ats.tools.objectstorebrowser.PluginClassloader;
import java.util.Hashtable;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentHashMap;
import java.io.File;
/**
* Handles object state viewers.
*
* @author Richard A. Begg (richard.begg@arjuna.com)
* @version $Id: StateViewersRepository.java 2342 2006-03-30 13:06:17Z $
*/
public class StateViewersRepository
{
private final static String STATE_VIEWER_JAR_PREFIX = "osbv-";
private final static String JAR_MANIFEST_SECTION_NAME = "arjuna-tools-objectstorebrowser";
private final static String DEFAULT_ABSTRACT_RECORD_VIEWER = "com.arjuna.ats.tools.objectstorebrowser.stateviewers.viewers.abstractrecord.AbstractRecordViewer";
/** Store objectTypeName to stateViewer mappings **/
private static ConcurrentMap _stateViewers = new ConcurrentHashMap();
private static ConcurrentMap _abstractRecordStateViewers = new ConcurrentHashMap();
private static StateViewerInterface _defaultStateViewer = null;
public static void registerStateViewer(String objectTypeName, StateViewerInterface stateViewer) throws ViewerAlreadyRegisteredException
{
_stateViewers.putIfAbsent( objectTypeName, stateViewer );
/** If stateviewer already registered then throw an exception **/
/*
if ( !_stateViewers.containsKey(objectTypeName) )
{
_stateViewers.put( objectTypeName, stateViewer );
}
else
{
throw new ViewerAlreadyRegisteredException("A viewer is already registered for object type '"+objectTypeName+"'");
}
*/
}
public static void registerAbstractRecordStateViewer(String type, AbstractRecordStateViewerInterface stateViewer) throws ViewerAlreadyRegisteredException
{
_abstractRecordStateViewers.putIfAbsent(type,stateViewer);
/** If the state viewer is already registered then throw an exception **/
/*
if ( !_abstractRecordStateViewers.containsKey(type) )
{
_abstractRecordStateViewers.put( type, stateViewer );
}
else
{
throw new ViewerAlreadyRegisteredException("A viewer is already registered for object type '"+type+"'");
}
*/
}
public static void setDefaultStateViewer(StateViewerInterface svi)
{
_defaultStateViewer = svi;
}
public static StateViewerInterface lookupStateViewer(String objectTypeName)
{
StateViewerInterface svi = (StateViewerInterface)_stateViewers.get(objectTypeName);
/** If the object type is not registered then look for a more generic viewer **/
if (svi == null)
{
// determine where the last component starts (assumes objectTypeName != null)
int i = objectTypeName.substring(0, objectTypeName.length() - 1).lastIndexOf('/');
if (i == -1)
return _defaultStateViewer; // no more components so return the default viewer
else
return lookupStateViewer(objectTypeName.substring(0, i + 1));
}
else
return svi;
}
public static AbstractRecordStateViewerInterface lookupAbstractRecordStateViewer(String type)
{
AbstractRecordStateViewerInterface svi = (AbstractRecordStateViewerInterface)_abstractRecordStateViewers.get(type);
if (svi == null)
return (AbstractRecordStateViewerInterface)_abstractRecordStateViewers.get(DEFAULT_ABSTRACT_RECORD_VIEWER);
return svi;
}
public static void initialiseRepository(File pluginDir)
{
try
{
PluginClassloader classloader = new PluginClassloader(STATE_VIEWER_JAR_PREFIX, null, JAR_MANIFEST_SECTION_NAME, pluginDir);
Object[] plugins = classloader.getPlugins();
for (int count=0;count<plugins.length;count++)
{
if ( plugins[count] instanceof StateViewerInterface )
{
StateViewerInterface viewer = ((StateViewerInterface)plugins[count]);
/** Get the type name and ensure the delimiters and the correct ones **/
String type = viewer.getType();
StateViewersRepository.registerStateViewer( type, viewer );
}
else
if ( plugins[count] instanceof AbstractRecordStateViewerInterface )
{
AbstractRecordStateViewerInterface viewer = ((AbstractRecordStateViewerInterface)plugins[count]);
/** Get the type name and ensure the delimiters and the correct ones **/
String type = viewer.getType();
StateViewersRepository.registerAbstractRecordStateViewer( type, viewer );
}
}
}
catch (Exception e)
{
e.printStackTrace();
throw new ExceptionInInitializerError("Failed to initiate object state viewers: "+e);
}
}
public static void disposeRepository()
{
_stateViewers.clear();
_abstractRecordStateViewers.clear();
}
}