butler.sql.function
Class Count

java.lang.Object
  butler.sql.function.Count

All Implemented Interfaces:

AggregateFunction, Function, NumericAggregateFunction

public class Count
extends java.lang.Object
implements NumericAggregateFunction

count function.

Author:

Fredrik Bertilsson

Nested Class Summary

Nested classes/interfaces inherited from interface butler.sql.function.Function

Function.Call

Constructor Summary

Count()

Method Summary

java.lang.Double	calculate(java.util.Iterator i)
java.lang.String	getName()

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

calculate

public java.lang.Double calculate(java.util.Iterator i)
                           throws java.lang.Exception

Specified by:

calculate in interface NumericAggregateFunction

Throws:

java.lang.Exception

getName

public java.lang.String getName()

Specified by:

getName in interface Function