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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
* 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.container.IContainerDelta.Kind;
import org.eclipse.net4j.util.event.IEvent;
import org.eclipse.net4j.util.lifecycle.ILifecycle;
import org.eclipse.net4j.util.lifecycle.ShareableLifecycle;
import java.util.List;
/**
* An abstract base implementation of a {@link IContainer container} with a {@link ILifecycle lifecycle}.
*
* @author Eike Stepper
*/
public abstract class Container<E> extends ShareableLifecycle implements IContainer<E>
{
public Container()
{
this(false);
}
/**
* @since 3.3
*/
public Container(boolean shareable)
{
super(shareable);
}
public boolean isEmpty()
{
if (!isActive())
{
return true;
}
E[] elements = getElements();
return elements == null || elements.length == 0;
}
@Override
public void fireEvent(IEvent event)
{
if (event instanceof IContainerEvent<?>)
{
if (((IContainerEvent<?>)event).isEmpty())
{
return;
}
}
super.fireEvent(event);
}
public void fireContainerEvent(E element, Kind kind)
{
fireEvent(newContainerEvent(element, kind));
}
public void fireElementAddedEvent(E element)
{
fireContainerEvent(element, IContainerDelta.Kind.ADDED);
}
public void fireElementRemovedEvent(E element)
{
fireContainerEvent(element, IContainerDelta.Kind.REMOVED);
}
/**
* @since 2.0
*/
public void fireContainerEvent(E[] elements, Kind kind)
{
ContainerEvent<E> event = new ContainerEvent<E>(this);
for (E element : elements)
{
event.addDelta(element, kind);
}
fireEvent(event);
}
/**
* @since 2.0
*/
public void fireElementsAddedEvent(E[] elements)
{
fireContainerEvent(elements, IContainerDelta.Kind.ADDED);
}
/**
* @since 2.0
*/
public void fireElementsRemovedEvent(E[] elements)
{
fireContainerEvent(elements, IContainerDelta.Kind.REMOVED);
}
public void fireContainerEvent(List<IContainerDelta<E>> deltas)
{
fireEvent(new ContainerEvent<E>(this, deltas));
}
protected SingleDeltaContainerEvent<E> newContainerEvent(E element, IContainerDelta.Kind kind)
{
return new SingleDeltaContainerEvent<E>(this, element, kind);
}
protected ContainerEvent<E> newContainerEvent()
{
return new ContainerEvent<E>(this);
}
}
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