mondrian.rolap
Class RolapNativeTopCount

java.lang.Object
  mondrian.rolap.RolapNative
      mondrian.rolap.RolapNativeSet
          mondrian.rolap.RolapNativeTopCount

public class RolapNativeTopCount
extends RolapNativeSet

Computes a TopCount in SQL.

Since:

Nov 21, 2005

Author:

av

Nested Class Summary

(package private) static class

RolapNativeTopCount.TopCountConstraint

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

RolapNativeSet.SchemaReaderWithMemberReaderAvailable, RolapNativeSet.SetConstraint, RolapNativeSet.SetEvaluator

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

RolapNative.Listener, RolapNative.NativeEvent, RolapNative.TupleEvent

Field Summary

Fields inherited from class mondrian.rolap.RolapNativeSet

LOGGER

Fields inherited from class mondrian.rolap.RolapNative

listener

Constructor Summary

RolapNativeTopCount()

Method Summary

(package private) NativeEvaluator	createEvaluator(RolapEvaluator evaluator, FunDef fun, Exp[] args) If function can be implemented in SQL, returns a NativeEvaluator that computes the result; otherwise returns null.
protected boolean	restrictMemberTypes() Returns whether certain member types (e.g.

Methods inherited from class mondrian.rolap.RolapNativeSet

crossJoinArgFactory, isPreferInterpreter, overrideContext, useHardCache

Methods inherited from class mondrian.rolap.RolapNative

getListener, isEnabled, setEnabled, setListener

Methods inherited from class java.lang.Object

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

Constructor Detail

RolapNativeTopCount

public RolapNativeTopCount()

Method Detail

restrictMemberTypes

protected boolean restrictMemberTypes()

Description copied from class: RolapNativeSet

Returns whether certain member types (e.g. calculated members) should disable native SQL evaluation for expressions containing them.

If true, expressions containing calculated members will be evaluated by the interpreter, instead of using SQL.

If false, calc members will be ignored and the computation will be done in SQL, returning more members than requested. This is ok, if the superflous members are filtered out in java code afterwards.

Specified by:

restrictMemberTypes in class RolapNativeSet

Returns:

whether certain member types should disable native SQL evaluation

createEvaluator

NativeEvaluator createEvaluator(RolapEvaluator evaluator,
                                FunDef fun,
                                Exp[] args)

Description copied from class: RolapNative

If function can be implemented in SQL, returns a NativeEvaluator that computes the result; otherwise returns null.

Specified by:

createEvaluator in class RolapNative