package com.espertech.esper.epl.agg;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.collection.IteratorCollectionRO;
import com.espertech.esper.epl.expression.ExprEvaluator;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
/**
* Represents the aggregation accessor that provides the result for the "window" aggregation function.
*/
public class AggregationAccessorAll implements AggregationAccessor
{
private final int streamNum;
private final ExprEvaluator childNode;
private final EventBean[] eventsPerStream;
private final Class componentType;
/**
* Ctor.
* @param streamNum stream id
* @param childNode expression
* @param componentType type
*/
public AggregationAccessorAll(int streamNum, ExprEvaluator childNode, Class componentType)
{
this.streamNum = streamNum;
this.childNode = childNode;
this.eventsPerStream = new EventBean[streamNum + 1];
this.componentType = componentType;
}
public Object getValue(AggregationAccess access) {
if (access.size() == 0) {
return null;
}
Object array = Array.newInstance(componentType, access.size());
Iterator<EventBean> it = access.iterator();
int count = 0;
for (;it.hasNext();) {
EventBean bean = it.next();
eventsPerStream[streamNum] = bean;
Object value = childNode.evaluate(eventsPerStream, true, null);
Array.set(array, count++, value);
}
return array;
}
public Collection<EventBean> getCollectionReadOnly(AggregationAccess access) {
if (access.size() == 0) {
return null;
}
return access.collectionReadOnly();
}
public EventBean getEventBean(AggregationAccess currentAcces) {
return null;
}
}