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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.container;
import org.eclipse.net4j.util.event.IListener;
/**
* @author Eike Stepper
*/
public final class ContainerUtil
{
private static final Object[] NO_ELEMENTS = {};
private static final IContainer<Object> EMPTY = new IContainer<Object>()
{
public Object[] getElements()
{
return NO_ELEMENTS;
}
public boolean isEmpty()
{
return true;
}
public void addListener(IListener listener)
{
}
public void removeListener(IListener listener)
{
}
@Override
public String toString()
{
return "EMPTY_CONTAINER";
}
};
private ContainerUtil()
{
}
public static IContainer<Object> emptyContainer()
{
return EMPTY;
}
public static IManagedContainer createContainer()
{
return new ManagedContainer();
}
public static boolean isEmpty(Object container)
{
if (container instanceof IContainer)
{
return ((IContainer<?>)container).isEmpty();
}
return true;
}
public static Object[] getElements(Object container)
{
if (container instanceof IContainer)
{
return ((IContainer<?>)container).getElements();
}
return NO_ELEMENTS;
}
}
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