mondrian.rolap
Class SqlMemberSource

java.lang.Object
  mondrian.rolap.SqlMemberSource

All Implemented Interfaces:

MemberReader, MemberSource, TupleReader.MemberBuilder

Direct Known Subclasses:

RolapCubeHierarchy.RolapCubeSqlMemberSource

 class SqlMemberSource
extends Object
implements MemberReader, TupleReader.MemberBuilder

A SqlMemberSource reads members from a SQL database.

It's a good idea to put a CacheMemberReader on top of this.

Since:

21 December, 2001

Author:

jhyde

Constructor Summary

SqlMemberSource(RolapHierarchy hierarchy)

Method Summary

int	compare(RolapMember m1, RolapMember m2, boolean siblingsAreEqual) Compares two members according to their order in a prefix ordered traversal.
RolapMember	desubstitute(RolapMember member) Returns the member which was substituted.
RolapMember	getDefaultMember()
RolapHierarchy	getHierarchy() Returns the hierarchy that this source is reading for.
RolapMember	getLeadMember(RolapMember member, int n) Returns the member n after member in the same level (or before, if n is negative).
int	getLevelMemberCount(RolapLevel level) Returns the number of members in this level.
TupleReader.MemberBuilder	getMemberBuilder()
MemberCache	getMemberCache() Returns the MemberCache to look up members before creating them.
Object	getMemberCacheLock() Returns the object which acts as the member cache synchronization lock.
void	getMemberChildren(List<RolapMember> parentMembers, List<RolapMember> children) Returns all members which are a child of one of the members in parentMembers, sorted by ordinal.
void	getMemberChildren(List<RolapMember> parentMembers, List<RolapMember> children, MemberChildrenConstraint mcc) Populates a list of the children of a given set of Members, optionally applying a constraint.
void	getMemberChildren(RolapMember parentMember, List<RolapMember> children) Writes all children parentMember to children.
void	getMemberChildren(RolapMember parentMember, List<RolapMember> children, MemberChildrenConstraint constraint) Populates a list of the children of a Member, optionally applying a constraint.
int	getMemberCount() Returns an estimate of number of members in this hierarchy.
RolapMember	getMemberParent(RolapMember member)
void	getMemberRange(RolapLevel level, RolapMember startMember, RolapMember endMember, List<RolapMember> memberList) Writes all members between startMember and endMember into list.
List<RolapMember>	getMembers() Returns all members of this hierarchy, sorted by ordinal.
List<RolapMember>	getMembersInLevel(RolapLevel level, int startOrdinal, int endOrdinal) Returns all of the members in level whose ordinal lies between startOrdinal and endOrdinal.
List<RolapMember>	getMembersInLevel(RolapLevel level, int startOrdinal, int endOrdinal, TupleConstraint constraint) Returns the members in the given Level, optionally between a range of ordinals and applying a constraint.
List<RolapMember>	getRootMembers() Returns all members of this hierarchy which do not have a parent, sorted by ordinal.
RolapMember	lookupMember(List<Id.Segment> uniqueNameParts, boolean failIfNotFound) Finds a member based upon its unique name.
(package private) String	makeChildMemberSql(RolapMember member, DataSource dataSource, MemberChildrenConstraint constraint) Generates the SQL statement to access the children of member.
RolapMember	makeMember(RolapMember parentMember, RolapLevel childLevel, Object value, Object captionValue, boolean parentChild, ResultSet resultSet, Object key, int columnOffset) Creates a new member (together with its properties).
boolean	setCache(MemberCache cache) Sets the cache which this MemberSource will write to.
RolapMember	substitute(RolapMember member) Substitutes a given member.

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlMemberSource

SqlMemberSource(RolapHierarchy hierarchy)

Method Detail

getHierarchy

public RolapHierarchy getHierarchy()

Description copied from interface: MemberSource

Returns the hierarchy that this source is reading for.

Specified by:

getHierarchy in interface MemberSource

setCache

public boolean setCache(MemberCache cache)

Description copied from interface: MemberSource

Sets the cache which this MemberSource will write to.

Cache-writeback is optional (for example, SqlMemberSource supports it, and ArrayMemberSource does not), and the return value from this method indicates whether this object supports it.

If this method returns true, the MemberSource.getMembers(), MemberSource.getRootMembers() and MemberSource.getMemberChildren(mondrian.rolap.RolapMember, java.util.List) methods must write to the cache, in addition to returning members as a return value.

Specified by:

setCache in interface MemberSource

Parameters:

cache - The MemberCache which the caller would like this MemberSource to write to.

Returns:

Whether this MemberSource supports cache-writeback.

getMemberCount

public int getMemberCount()

Description copied from interface: MemberSource

Returns an estimate of number of members in this hierarchy.

Specified by:

getMemberCount in interface MemberSource

substitute

public RolapMember substitute(RolapMember member)

Description copied from interface: MemberReader

Substitutes a given member. If member is null, returns null.

This method is called whenever a member is returned from the wrapped member reader and is to be returned to the caller. You could say that it translates 'to caller space'.

Specified by:

substitute in interface MemberReader

Parameters:

member - Member

Returns:

Substitute member

desubstitute

public RolapMember desubstitute(RolapMember member)

Description copied from interface: MemberReader

Returns the member which was substituted. If member is null, returns null.

This method is called whenever the caller passes a member into a method and needs to be passed to a method on the wrapped member reader. You could say that it translates 'from caller space'.

Specified by:

desubstitute in interface MemberReader

Parameters:

member - Member

Returns:

Internal member

lookupMember

public RolapMember lookupMember(List<Id.Segment> uniqueNameParts,
                                boolean failIfNotFound)

Description copied from interface: MemberSource

Finds a member based upon its unique name.

Specified by:

lookupMember in interface MemberSource

getLevelMemberCount

public int getLevelMemberCount(RolapLevel level)

Description copied from interface: MemberReader

Returns the number of members in this level.

Specified by:

getLevelMemberCount in interface MemberReader

Parameters:

level - Level

Returns:

number of members in level

getMembers

public List<RolapMember> getMembers()

Description copied from interface: MemberSource

Returns all members of this hierarchy, sorted by ordinal.

If this object supports cache-writeaback, also writes these members to the cache.

Specified by:

getMembers in interface MemberSource

getMembersInLevel

public List<RolapMember> getMembersInLevel(RolapLevel level,
                                           int startOrdinal,
                                           int endOrdinal)

Description copied from interface: MemberReader

Returns all of the members in level whose ordinal lies between startOrdinal and endOrdinal.

If this object supports cache-writeback, also writes these members to the cache.

Specified by:

getMembersInLevel in interface MemberReader

Returns:

List of RolapMember

getMembersInLevel

public List<RolapMember> getMembersInLevel(RolapLevel level,
                                           int startOrdinal,
                                           int endOrdinal,
                                           TupleConstraint constraint)

Description copied from interface: MemberReader

Returns the members in the given Level, optionally between a range of ordinals and applying a constraint.

Specified by:

getMembersInLevel in interface MemberReader

Parameters:

level - Level

startOrdinal - Ordinal of first member to retrieve

endOrdinal - Ordinal of last member to upper bound

constraint - Constraint

Returns:

list of members

getMemberCache

public MemberCache getMemberCache()

Description copied from interface: TupleReader.MemberBuilder

Returns the MemberCache to look up members before creating them.

Specified by:

getMemberCache in interface TupleReader.MemberBuilder

getMemberCacheLock

public Object getMemberCacheLock()

Description copied from interface: TupleReader.MemberBuilder

Returns the object which acts as the member cache synchronization lock.

Specified by:

getMemberCacheLock in interface TupleReader.MemberBuilder

getRootMembers

public List<RolapMember> getRootMembers()

Description copied from interface: MemberSource

Returns all members of this hierarchy which do not have a parent, sorted by ordinal.

If this object supports cache-writeback, also writes these members to the cache.

Specified by:

getRootMembers in interface MemberSource

Returns:

List of RolapMembers

makeChildMemberSql

String makeChildMemberSql(RolapMember member,
                          DataSource dataSource,
                          MemberChildrenConstraint constraint)

Generates the SQL statement to access the children of member. For example,

SELECT "city"
 FROM "customer"
 WHERE "country" = 'USA'
 AND "state_province" = 'BC'
 GROUP BY "city"

retrieves the children of the member [Canada].[BC].

Note that this method is never called in the context of virtual cubes, it is only called on regular cubes.

See also SqlTupleReader.makeLevelMembersSql(javax.sql.DataSource).

getMemberChildren

public void getMemberChildren(List<RolapMember> parentMembers,
                              List<RolapMember> children)

Description copied from interface: MemberSource

Returns all members which are a child of one of the members in parentMembers, sorted by ordinal.

If this object supports cache-writeaback, also writes these members to the cache.

Specified by:

getMemberChildren in interface MemberSource

getMemberChildren

public void getMemberChildren(List<RolapMember> parentMembers,
                              List<RolapMember> children,
                              MemberChildrenConstraint mcc)

Description copied from interface: MemberReader

Populates a list of the children of a given set of Members, optionally applying a constraint.

Specified by:

getMemberChildren in interface MemberReader

Parameters:

parentMembers - List of members whose children to find

children - List to populate with members

mcc - Constraint

getMemberChildren

public void getMemberChildren(RolapMember parentMember,
                              List<RolapMember> children)

Description copied from interface: MemberSource

Writes all children parentMember to children.

If this object supports cache-writeback, also writes these members to the cache.

Specified by:

getMemberChildren in interface MemberSource

getMemberChildren

public void getMemberChildren(RolapMember parentMember,
                              List<RolapMember> children,
                              MemberChildrenConstraint constraint)

Description copied from interface: MemberReader

Populates a list of the children of a Member, optionally applying a constraint.

Specified by:

getMemberChildren in interface MemberReader

Parameters:

parentMember - Members whose children to find

children - List to populate with members

constraint - Constraint

makeMember

public RolapMember makeMember(RolapMember parentMember,
                              RolapLevel childLevel,
                              Object value,
                              Object captionValue,
                              boolean parentChild,
                              ResultSet resultSet,
                              Object key,
                              int columnOffset)
                       throws SQLException

Description copied from interface: TupleReader.MemberBuilder

Creates a new member (together with its properties).

Specified by:

makeMember in interface TupleReader.MemberBuilder

Throws:

SQLException

See Also:

makeMember(RolapMember, RolapLevel, Object, Object, boolean, ResultSet, Object, int)

getLeadMember

public RolapMember getLeadMember(RolapMember member,
                                 int n)

Description copied from interface: MemberReader

Returns the member n after member in the same level (or before, if n is negative). Returns Hierarchy.getNullMember() if we run off the beginning or end of the level.

Specified by:

getLeadMember in interface MemberReader

getMemberRange

public void getMemberRange(RolapLevel level,
                           RolapMember startMember,
                           RolapMember endMember,
                           List<RolapMember> memberList)

Description copied from interface: MemberReader

Writes all members between startMember and endMember into list.

Specified by:

getMemberRange in interface MemberReader

compare

public int compare(RolapMember m1,
                   RolapMember m2,
                   boolean siblingsAreEqual)

Description copied from interface: MemberReader

Compares two members according to their order in a prefix ordered traversal. If siblingsAreEqual, then two members with the same parent will compare equal.

Specified by:

compare in interface MemberReader

Returns:

less than zero if m1 occurs before m2, greater than zero if m1 occurs after m2, zero if m1 is equal to m2, or if siblingsAreEqual and m1 and m2 have the same parent

getMemberBuilder

public TupleReader.MemberBuilder getMemberBuilder()

Specified by:

getMemberBuilder in interface MemberReader

getDefaultMember

public RolapMember getDefaultMember()

Specified by:

getDefaultMember in interface MemberReader

getMemberParent

public RolapMember getMemberParent(RolapMember member)

Specified by:

getMemberParent in interface MemberReader