/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.view;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.ArrayEventIterator;
import com.espertech.esper.collection.SingleEventIterator;
import java.util.Iterator;
/**
* Event stream implementation that does not keep any window by itself of the events coming into the stream.
*/
public final class ZeroDepthStream implements EventStream
{
private View[] children = ViewSupport.EMPTY_VIEW_ARRAY;
private final EventType eventType;
private EventBean lastInsertedEvent;
private EventBean[] lastInsertedEvents;
/**
* Ctor.
* @param eventType - type of event
*/
public ZeroDepthStream(EventType eventType)
{
this.eventType = eventType;
}
public void insert(EventBean[] events)
{
for (View childView : children)
{
childView.update(events, null);
}
lastInsertedEvents = events;
}
public final void insert(EventBean theEvent)
{
// Get a new array created rather then re-use the old one since some client listeners
// to this view may keep reference to the new data
EventBean[] row = new EventBean[]{theEvent};
for (View childView : children)
{
childView.update(row, null);
}
lastInsertedEvent = theEvent;
}
public final EventType getEventType()
{
return eventType;
}
public final Iterator<EventBean> iterator()
{
if (lastInsertedEvents != null)
{
return new ArrayEventIterator(lastInsertedEvents);
}
return new SingleEventIterator(lastInsertedEvent);
}
public final View addView(View view)
{
children = ViewSupport.addView(children, view);
view.setParent(this);
return view;
}
public final View[] getViews()
{
return children;
}
public final boolean removeView(View view)
{
int index = ViewSupport.findViewIndex(children, view);
if (index == -1) {
return false;
}
children = ViewSupport.removeView(children, index);
view.setParent(null);
return true;
}
public final boolean hasViews()
{
return children.length > 0;
}
public void removeAllViews()
{
children = ViewSupport.EMPTY_VIEW_ARRAY;
}
}