mondrian.rolap
Class RolapNativeSet.SetConstraint

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

All Implemented Interfaces:

MemberChildrenConstraint, SqlConstraint, TupleConstraint

Direct Known Subclasses:

RolapNativeCrossJoin.NonEmptyCrossJoinConstraint, RolapNativeFilter.FilterConstraint, RolapNativeTopCount.TopCountConstraint

Enclosing class:

RolapNativeSet

protected abstract static class RolapNativeSet.SetConstraint
extends SqlContextConstraint

Constraint for non empty {crossjoin, member.children, member.descendants, level.members}

Field Summary

(package private) CrossJoinArg[]

args

Constructor Summary

RolapNativeSet.SetConstraint(CrossJoinArg[] args, RolapEvaluator evaluator, boolean strict)

Method Summary

void	addConstraint(SqlQuery sqlQuery, RolapCube baseCube, AggStar aggStar) Called from LevelMembers: restricts the SQL resultset to the current context.
Object	getCacheKey() returns a key to cache the result
MemberChildrenConstraint	getMemberChildrenConstraint(RolapMember parent) Returns null to prevent the member/childern from being cached.
protected boolean	isJoinRequired() Returns whether a join with the fact table is required.

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

args

CrossJoinArg[] args

Constructor Detail

RolapNativeSet.SetConstraint

RolapNativeSet.SetConstraint(CrossJoinArg[] args,
                             RolapEvaluator evaluator,
                             boolean strict)

Method Detail

isJoinRequired

protected boolean isJoinRequired()

Returns whether a join with the fact table is required. A join is required if the context contains members from dimensions other than level. If we are interested in the members of a level or a members children then it does not make sense to join only one dimension (the one that contains the requested members) with the fact table for NON EMPTY optimization.

If there is a crossjoin, we need to join the fact table - even if the evaluator context is empty.

Overrides:

isJoinRequired in class SqlContextConstraint

addConstraint

public void addConstraint(SqlQuery sqlQuery,
                          RolapCube baseCube,
                          AggStar aggStar)

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 SqlContextConstraint

Parameters:

sqlQuery - the query to modify

baseCube - base cube for virtual cube constraints

aggStar - aggregate star to use

getMemberChildrenConstraint

public MemberChildrenConstraint getMemberChildrenConstraint(RolapMember parent)

Returns null to prevent the member/childern from being cached. There exists no valid MemberChildrenConstraint that would fetch those children that were extracted as a side effect from evaluating a non empty crossjoin

Specified by:

getMemberChildrenConstraint in interface TupleConstraint

Overrides:

getMemberChildrenConstraint in class SqlContextConstraint

getCacheKey

public Object getCacheKey()

returns a key to cache the result

Specified by:

getCacheKey in interface SqlConstraint

Overrides:

getCacheKey in class SqlContextConstraint

Returns:

valid key or null to prevent the result from being cached