/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.sorted;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
public abstract class SortedAccessStrategyRangeBase {
protected ExprEvaluator start;
protected boolean includeStart;
protected ExprEvaluator end;
protected boolean includeEnd;
private final boolean isNWOnTrigger;
private final EventBean[] events;
private final int lookupStream;
protected SortedAccessStrategyRangeBase(boolean isNWOnTrigger, int lookupStream, int numStreams, ExprEvaluator start, boolean includeStart, ExprEvaluator end, boolean includeEnd) {
this.start = start;
this.includeStart = includeStart;
this.end = end;
this.includeEnd = includeEnd;
this.isNWOnTrigger = isNWOnTrigger;
this.lookupStream = lookupStream;
if (lookupStream != -1) {
events = new EventBean[lookupStream + 1];
} else {
events = new EventBean[numStreams + 1];
}
}
public Object evaluateLookupStart(EventBean theEvent, ExprEvaluatorContext context) {
events[lookupStream] = theEvent;
return start.evaluate(events, true, context);
}
public Object evaluateLookupEnd(EventBean theEvent, ExprEvaluatorContext context) {
events[lookupStream] = theEvent;
return end.evaluate(events, true, context);
}
public Object evaluatePerStreamStart(EventBean[] eventsPerStream, ExprEvaluatorContext context) {
if (isNWOnTrigger) {
return start.evaluate(eventsPerStream, true, context);
} else {
System.arraycopy(eventsPerStream, 0, events, 1, eventsPerStream.length);
return start.evaluate(events, true, context);
}
}
public Object evaluatePerStreamEnd(EventBean[] eventsPerStream, ExprEvaluatorContext context) {
if (isNWOnTrigger) {
return end.evaluate(eventsPerStream, true, context);
} else {
System.arraycopy(eventsPerStream, 0, events, 1, eventsPerStream.length);
return end.evaluate(events, true, context);
}
}
public String toQueryPlan() {
return this.getClass().getSimpleName() + " start=" + start.getClass().getSimpleName() +
", includeStart=" + includeStart +
", end=" + end.getClass().getSimpleName() +
", includeEnd=" + includeEnd;
}
}