uk.ac.ed.epcc.safe.accounting

Class NumberAverageReductionTarget

java.lang.Object

uk.ac.ed.epcc.safe.accounting.ReductionTarget<java.lang.Number>

uk.ac.ed.epcc.safe.accounting.NumberReductionTarget

uk.ac.ed.epcc.safe.accounting.NumberAverageReductionTarget

public class NumberAverageReductionTarget
extends NumberReductionTarget

A ReductionTarget operating on numbers that generate an average. The result is always a AverageValue object.

Author:

spb

Constructor Summary

Constructors

Constructor and Description
NumberAverageReductionTarget(PropExpression<? extends java.lang.Number> tag)

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Number	combine(java.lang.Number a, java.lang.Number b) Combine two partial values.
java.lang.Number	getDefault() value to return if no records combined,

Methods inherited from class uk.ac.ed.epcc.safe.accounting.NumberReductionTarget

getInstance

Methods inherited from class uk.ac.ed.epcc.safe.accounting.ReductionTarget

equals, getExpression, getReduction, getTarget, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

NumberAverageReductionTarget

public NumberAverageReductionTarget(PropExpression<? extends java.lang.Number> tag)
                             throws IllegalReductionException

Throws:

IllegalReductionException

Method Detail

combine

public java.lang.Number combine(java.lang.Number a,
                       java.lang.Number b)

Description copied from class: ReductionTarget

Combine two partial values. The default value must be a legal input

Specified by:

combine in class ReductionTarget<java.lang.Number>

Returns:

combined result

getDefault

public java.lang.Number getDefault()

Description copied from class: ReductionTarget

value to return if no records combined,

Overrides:

getDefault in class ReductionTarget<java.lang.Number>

Returns:

default value