package org.codehaus.plexus.classworlds;
/*
* Copyright 2001-2006 Codehaus Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.Closeable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.classworlds.realm.DuplicateRealmException;
import org.codehaus.plexus.classworlds.realm.NoSuchRealmException;
/**
* A collection of <code>ClassRealm</code>s, indexed by id.
*
* @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
*/
public class ClassWorld
{
private Map<String, ClassRealm> realms;
private final List<ClassWorldListener> listeners = new ArrayList<ClassWorldListener>();
public ClassWorld( String realmId, ClassLoader classLoader )
{
this();
try
{
newRealm( realmId, classLoader );
}
catch ( DuplicateRealmException e )
{
// Will never happen as we are just creating the world.
}
}
public ClassWorld()
{
this.realms = new LinkedHashMap<String, ClassRealm>();
}
public ClassRealm newRealm( String id )
throws DuplicateRealmException
{
return newRealm( id, getClass().getClassLoader() );
}
public synchronized ClassRealm newRealm( String id, ClassLoader classLoader )
throws DuplicateRealmException
{
if ( realms.containsKey( id ) )
{
throw new DuplicateRealmException( this, id );
}
ClassRealm realm;
realm = new ClassRealm( this, id, classLoader );
realms.put( id, realm );
for ( ClassWorldListener listener : listeners )
{
listener.realmCreated( realm );
}
return realm;
}
public synchronized void disposeRealm( String id )
throws NoSuchRealmException
{
ClassRealm realm = (ClassRealm) realms.remove( id );
if ( realm != null )
{
closeIfJava7( realm );
for ( ClassWorldListener listener : listeners )
{
listener.realmDisposed( realm );
}
}
}
private void closeIfJava7( ClassRealm realm )
{
try
{
//noinspection ConstantConditions
if ( realm instanceof Closeable )
{
//noinspection RedundantCast
( (Closeable) realm ).close();
}
}
catch ( IOException ignore )
{
}
}
public synchronized ClassRealm getRealm( String id )
throws NoSuchRealmException
{
if ( realms.containsKey( id ) )
{
return (ClassRealm) realms.get( id );
}
throw new NoSuchRealmException( this, id );
}
public synchronized Collection<ClassRealm> getRealms()
{
return Collections.unmodifiableList( new ArrayList<ClassRealm>( realms.values() ) );
}
// from exports branch
public synchronized ClassRealm getClassRealm( String id )
{
if ( realms.containsKey( id ) )
{
return realms.get( id );
}
return null;
}
public synchronized void addListener( ClassWorldListener listener )
{
// TODO ideally, use object identity, not equals
if ( !listeners.contains( listener ) )
{
listeners.add( listener );
}
}
public synchronized void removeListener( ClassWorldListener listener )
{
listeners.remove( listener );
}
}