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/**
* Copyright (c) 2004 - 2011 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.IContainerEventVisitor.Filtered;
import org.eclipse.net4j.util.event.Event;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
/**
* @author Eike Stepper
* @noextend This class is not intended to be subclassed by clients.
*/
public class ContainerEvent<E> extends Event implements IContainerEvent<E>
{
private static final long serialVersionUID = 1L;
private List<IContainerDelta<E>> deltas;
public ContainerEvent(IContainer<E> container)
{
super(container);
deltas = new ArrayList<IContainerDelta<E>>();
}
public ContainerEvent(IContainer<E> container, List<IContainerDelta<E>> deltas)
{
super(container);
this.deltas = deltas;
}
/**
* @since 3.0
*/
@Override
@SuppressWarnings("unchecked")
public IContainer<E> getSource()
{
return (IContainer<E>)super.getSource();
}
public boolean isEmpty()
{
return deltas.isEmpty();
}
@SuppressWarnings("unchecked")
public IContainerDelta<E>[] getDeltas()
{
return deltas.toArray(new IContainerDelta[deltas.size()]);
}
public IContainerDelta<E> getDelta() throws IllegalStateException
{
if (deltas.size() != 1)
{
throw new IllegalStateException("deltas.size() != 1"); //$NON-NLS-1$
}
return deltas.get(0);
}
public E getDeltaElement() throws IllegalStateException
{
return getDelta().getElement();
}
public IContainerDelta.Kind getDeltaKind() throws IllegalStateException
{
return getDelta().getKind();
}
public void addDelta(E element, IContainerDelta.Kind kind)
{
addDelta(new ContainerDelta<E>(element, kind));
}
public void addDelta(IContainerDelta<E> delta)
{
deltas.add(delta);
}
public void accept(IContainerEventVisitor<E> visitor)
{
for (IContainerDelta<E> delta : deltas)
{
E element = delta.getElement();
boolean filtered = true;
if (visitor instanceof Filtered<?>)
{
filtered = ((Filtered<E>)visitor).filter(element);
}
if (filtered)
{
switch (delta.getKind())
{
case ADDED:
visitor.added(element);
break;
case REMOVED:
visitor.removed(element);
break;
}
}
}
}
@Override
public String toString()
{
StringBuilder builder = new StringBuilder();
for (IContainerDelta<E> delta : getDeltas())
{
builder.append(", "); //$NON-NLS-1$
builder.append(delta.getKind());
builder.append("="); //$NON-NLS-1$
builder.append(delta.getElement());
}
return MessageFormat.format("ContainerEvent[source={0}{1}]", getSource(), builder.toString()); //$NON-NLS-1$
}
}
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