/*
* *************************************************************************************
* 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.join.exec.composite;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
public abstract class CompositeAccessStrategyRelOpBase {
protected ExprEvaluator key;
protected Class coercionType;
private final EventBean[] events;
private final int lookupStream;
private final boolean isNWOnTrigger;
protected CompositeAccessStrategyRelOpBase(boolean isNWOnTrigger, int lookupStream, int numStreams, ExprEvaluator key, Class coercionType) {
this.key = key;
this.coercionType = coercionType;
if (lookupStream != -1) {
events = new EventBean[lookupStream + 1];
}
else {
events = new EventBean[numStreams + 1];
}
this.lookupStream = lookupStream;
this.isNWOnTrigger = isNWOnTrigger;
}
public Object evaluateLookup(EventBean theEvent, ExprEvaluatorContext context) {
events[lookupStream] = theEvent;
return key.evaluate(events, true, context);
}
public Object evaluatePerStream(EventBean[] eventPerStream, ExprEvaluatorContext context) {
if (isNWOnTrigger) {
return key.evaluate(eventPerStream, true, context);
}
else {
System.arraycopy(eventPerStream, 0, events, 1, eventPerStream.length);
return key.evaluate(events, true, context);
}
}
}