mondrian.rolap
Class SqlConstraintFactory

java.lang.Object
  mondrian.rolap.SqlConstraintFactory

public class SqlConstraintFactory
extends Object

Creates the right constraint for common tasks.

Since:

Nov 21, 2005

Author:

av

Field Summary

(package private) boolean

enabled

Method Summary

MemberChildrenConstraint	getChildByNameConstraint(RolapMember parent, Id.Segment childName)
TupleConstraint	getDescendantsConstraint(List<RolapMember> parentMembers, MemberChildrenConstraint mcc) Returns a constraint that allows to read all children of multiple parents at once using a LevelMember query style.
TupleConstraint	getLevelMembersConstraint(Evaluator context)
TupleConstraint	getLevelMembersConstraint(Evaluator context, Level[] levels, boolean[] satisfied) Returns a constraint that restricts the members of a level to those that are non-empty in the given context.
MemberChildrenConstraint	getMemberChildrenConstraint(Evaluator context)
static SqlConstraintFactory	instance()

Methods inherited from class java.lang.Object

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

Field Detail

enabled

boolean enabled

Method Detail

instance

public static SqlConstraintFactory instance()

getMemberChildrenConstraint

public MemberChildrenConstraint getMemberChildrenConstraint(Evaluator context)

getLevelMembersConstraint

public TupleConstraint getLevelMembersConstraint(Evaluator context)

getLevelMembersConstraint

public TupleConstraint getLevelMembersConstraint(Evaluator context,
                                                 Level[] levels,
                                                 boolean[] satisfied)

Returns a constraint that restricts the members of a level to those that are non-empty in the given context. If the constraint cannot be implemented (say if native constraints are disabled) returns null.

Parameters:

context - Context within which members must be non-empty

levels - levels being referenced in the current context

satisfied - Set to false if constraint does not satisfy non-empty context and caller still has to do it

Returns:

Constraint

getChildByNameConstraint

public MemberChildrenConstraint getChildByNameConstraint(RolapMember parent,
                                                         Id.Segment childName)

getDescendantsConstraint

public TupleConstraint getDescendantsConstraint(List<RolapMember> parentMembers,
                                                MemberChildrenConstraint mcc)

Returns a constraint that allows to read all children of multiple parents at once using a LevelMember query style. This does not work for parent/child hierarchies.

Parameters:

parentMembers - List of parents (all must belong to same level)

mcc - The constraint that would return the children for each single parent

Returns:

constraint