mondrian.rolap
Class RolapNativeTopCount.TopCountConstraint

java.lang.Object
  mondrian.rolap.SqlContextConstraint
      mondrian.rolap.RolapNativeSet.SetConstraint
          mondrian.rolap.RolapNativeTopCount.TopCountConstraint

All Implemented Interfaces:

MemberChildrenConstraint, SqlConstraint, TupleConstraint

Enclosing class:

RolapNativeTopCount

static class RolapNativeTopCount.TopCountConstraint
extends RolapNativeSet.SetConstraint

Field Summary

(package private) boolean	ascending
(package private) String	orderByExpr

Fields inherited from class mondrian.rolap.RolapNativeSet.SetConstraint

args

Fields inherited from class mondrian.rolap.SqlContextConstraint

cacheKey

Constructor Summary

RolapNativeTopCount.TopCountConstraint(RolapNativeSet.CrossJoinArg[] args, RolapEvaluator evaluator, String orderByExpr, boolean ascending)

Method Summary

void	addConstraint(SqlQuery sqlQuery, RolapCube baseCube) Called from LevelMembers: restricts the SQL resultset to the current context.
Object	getCacheKey() returns a key to cache the result
protected boolean	isJoinRequired() we alwas need to join the fact table because we want to evalutate the top count expression which involves a fact.

Methods inherited from class mondrian.rolap.RolapNativeSet.SetConstraint

getMemberChildrenConstraint

Methods inherited from class mondrian.rolap.SqlContextConstraint

addLevelConstraint, addMemberConstraint, addMemberConstraint, getEvaluator, isValidContext, isValidContext

Methods inherited from class java.lang.Object

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

Field Detail

orderByExpr

String orderByExpr

ascending

boolean ascending

Constructor Detail

RolapNativeTopCount.TopCountConstraint

public RolapNativeTopCount.TopCountConstraint(RolapNativeSet.CrossJoinArg[] args,
                                              RolapEvaluator evaluator,
                                              String orderByExpr,
                                              boolean ascending)

Method Detail

isJoinRequired

protected boolean isJoinRequired()

we alwas need to join the fact table because we want to evalutate the top count expression which involves a fact.

Overrides:

isJoinRequired in class RolapNativeSet.SetConstraint

addConstraint

public void addConstraint(SqlQuery sqlQuery,
                          RolapCube baseCube)

Description copied from class: SqlContextConstraint

Called from LevelMembers: restricts the SQL resultset to the current context.

Specified by:

addConstraint in interface TupleConstraint

Overrides:

addConstraint in class RolapNativeSet.SetConstraint

Parameters:

sqlQuery - the query to modify

baseCube - base cube for virtual cube constraints

getCacheKey

public Object getCacheKey()

Description copied from class: RolapNativeSet.SetConstraint

returns a key to cache the result

Specified by:

getCacheKey in interface SqlConstraint

Overrides:

getCacheKey in class RolapNativeSet.SetConstraint

Returns:

valid key or null to prevent the result from being cached