org.teiid.query.function.aggregate
Class Count

java.lang.Object
  org.teiid.query.function.aggregate.AggregateFunction
      org.teiid.query.function.aggregate.Count

public class Count
extends AggregateFunction

Just a simple COUNT() implementation that counts every non-null row it sees.

Constructor Summary

Count()

Method Summary

void	addInputDirect(java.lang.Object input, java.util.List<?> tuple) Called for the element value in every row of a group.
java.lang.Object	getResult() Called after all values have been processed to get the result.
void	reset() Called to reset the state of the function.

Methods inherited from class org.teiid.query.function.aggregate.AggregateFunction

addInput, initialize, setExpressionIndex

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Count

public Count()

Method Detail

reset

public void reset()

Description copied from class: AggregateFunction

Called to reset the state of the function.

Specified by:

reset in class AggregateFunction

addInputDirect

public void addInputDirect(java.lang.Object input,
                           java.util.List<?> tuple)

Description copied from class: AggregateFunction

Called for the element value in every row of a group.

Specified by:

addInputDirect in class AggregateFunction

Parameters:

input - Input value, may be null

See Also:

AggregateFunction.addInputDirect(Object, List)

getResult

public java.lang.Object getResult()

Description copied from class: AggregateFunction

Called after all values have been processed to get the result.

Specified by:

getResult in class AggregateFunction

Returns:

Result value

See Also:

AggregateFunction.getResult()