/**************************************************************************************
* 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;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.ArrayEventIterator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.Iterator;
/**
* View for the on-delete statement that handles removing events from a named window.
*/
public class NamedWindowOnDeleteView extends NamedWindowOnExprBaseView
{
private static final Log log = LogFactory.getLog(NamedWindowOnDeleteView.class);
private final NamedWindowOnDeleteViewFactory parent;
private EventBean[] lastResult;
public NamedWindowOnDeleteView(NamedWindowLookupStrategy lookupStrategy, NamedWindowRootViewInstance rootView, ExprEvaluatorContext exprEvaluatorContext, NamedWindowOnDeleteViewFactory parent) {
super(lookupStrategy, rootView, exprEvaluatorContext);
this.parent = parent;
}
public void handleMatching(EventBean[] triggerEvents, EventBean[] matchingEvents)
{
if ((matchingEvents != null) && (matchingEvents.length > 0))
{
// Events to delete are indicated via old data
this.rootView.update(null, matchingEvents);
// The on-delete listeners receive the events deleted, but only if there is interest
if (parent.getStatementResultService().isMakeNatural() || parent.getStatementResultService().isMakeSynthetic()) {
updateChildren(matchingEvents, null);
}
}
// Keep the last delete records
lastResult = matchingEvents;
}
public EventType getEventType()
{
return rootView.getEventType();
}
public Iterator<EventBean> iterator()
{
return new ArrayEventIterator(lastResult);
}
}