/**************************************************************************************
* 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.epl.named;
import com.espertech.esper.client.EventBean;
/**
* A holder for events posted by a named window as an insert and remove stream.
*/
public class NamedWindowDeltaData
{
private final EventBean[] newData;
private final EventBean[] oldData;
/**
* Ctor.
* @param newData is the insert stream events, or null if none
* @param oldData is the remove stream events, or null if none
*/
public NamedWindowDeltaData(EventBean[] newData, EventBean[] oldData)
{
this.newData = newData;
this.oldData = oldData;
}
/**
* Ctor aggregates two deltas into a single delta.
* @param deltaOne is the insert and remove stream events of a first result
* @param deltaTwo is the insert and remove stream events of a second result
*/
public NamedWindowDeltaData(NamedWindowDeltaData deltaOne, NamedWindowDeltaData deltaTwo)
{
this.newData = aggregate(deltaOne.getNewData(), deltaTwo.getNewData());
this.oldData = aggregate(deltaOne.getOldData(), deltaTwo.getOldData());
}
/**
* Returns the insert stream events.
* @return insert stream
*/
public EventBean[] getNewData()
{
return newData;
}
/**
* Returns the remove stream events.
* @return remove stream
*/
public EventBean[] getOldData()
{
return oldData;
}
private static EventBean[] aggregate(EventBean[] arrOne, EventBean[] arrTwo)
{
if (arrOne == null)
{
return arrTwo;
}
if (arrTwo == null)
{
return arrOne;
}
EventBean[] arr = new EventBean[arrOne.length + arrTwo.length];
System.arraycopy(arrOne, 0, arr, 0, arrOne.length);
System.arraycopy(arrTwo, 0, arr, arrOne.length, arrTwo.length);
return arr;
}
}