Package mondrian.rolap

Class RolapAggregator.BaseAggor

java.lang.Object

mondrian.olap.EnumeratedValues.BasicValue

mondrian.rolap.RolapAggregator

mondrian.rolap.RolapAggregator.BaseAggor

All Implemented Interfaces:

Aggregator, EnumeratedValues.Value

Direct Known Subclasses:

RolapAggregator.AvgFromAvg, RolapAggregator.AvgFromSum, RolapAggregator.SumFromAvg

Enclosing class:

RolapAggregator

public abstract static class RolapAggregator.BaseAggor
extends RolapAggregator

This is the base class for implementing aggregators over sum and average columns in an aggregate table. These differ from the above aggregators in that these require not oly the operand to create the aggregation String expression, but also, the aggregate table's fact count column expression. These aggregators are NOT singletons like the above aggregators; rather, each is different because of the fact count column expression.

Nested Class Summary

Nested classes/interfaces inherited from class mondrian.rolap.RolapAggregator

RolapAggregator.AvgFromAvg, RolapAggregator.AvgFromSum, RolapAggregator.BaseAggor, RolapAggregator.SumFromAvg

Field Summary

Fields

Modifier and Type	Field	Description
protected String	factCountExpr

Fields inherited from class mondrian.rolap.RolapAggregator

Avg, Count, DistinctCount, enumeration, Max, Min, Sum

Fields inherited from class mondrian.olap.EnumeratedValues.BasicValue

description, name, ordinal

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseAggor(String name, String factCountExpr)

Method Summary

Modifier and Type	Method	Description
Object	aggregate(Evaluator evaluator, TupleList members, Calc exp)	Applies this aggregator to an expression over a set of members and returns the result.
abstract boolean	alwaysRequiresFactColumn()
abstract String	getScalarExpression(String operand)

Methods inherited from class mondrian.rolap.RolapAggregator

aggregate, getExpression, getNonDistinctAggregator, getRollup, isDistinct, supportsFastAggregates

Methods inherited from class mondrian.olap.EnumeratedValues.BasicValue

equals, getDescription, getName, getOrdinal, toString, unexpected

Methods inherited from class java.lang.Object

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

Field Detail

factCountExpr

protected final String factCountExpr

Constructor Detail

BaseAggor

protected BaseAggor(String name,
                    String factCountExpr)

Method Detail

aggregate

public Object aggregate(Evaluator evaluator,
                        TupleList members,
                        Calc exp)

Description copied from interface: Aggregator

Applies this aggregator to an expression over a set of members and returns the result.

Parameters:

evaluator - Evaluation context

members - List of members, not null

exp - Expression to evaluate

Returns:

result of applying this aggregator to a set of members/tuples

alwaysRequiresFactColumn

public abstract boolean alwaysRequiresFactColumn()

getScalarExpression

public abstract String getScalarExpression(String operand)