mondrian.rolap
Class HighCardSqlTupleReader

java.lang.Object
  mondrian.rolap.SqlTupleReader
      mondrian.rolap.HighCardSqlTupleReader

All Implemented Interfaces:

TupleReader

public class HighCardSqlTupleReader
extends SqlTupleReader

Reads the members of a single level (level.members) or of multiple levels (crossjoin).

Since:

Dec, 2007

Author:

luis f. canals

Nested Class Summary

(package private) static class

HighCardSqlTupleReader.WhichSelect Description of the position of a SELECT statement in a UNION.

Nested classes/interfaces inherited from interface mondrian.rolap.TupleReader

TupleReader.MemberBuilder

Field Summary

(package private) int

maxRows

Fields inherited from class mondrian.rolap.SqlTupleReader

constraint

Constructor Summary

HighCardSqlTupleReader(TupleConstraint constraint)

Method Summary

void	addLevelMembers(RolapLevel level, TupleReader.MemberBuilder memberBuilder, List<RolapMember> srcMembers) Adds a hierarchy to retrieve members from.
Object	getCacheKey() Returns an object that uniquely identifies the Result that this TupleReader would return.
int	getEnumTargetCount()
int	getMaxRows()
void	noMoreRows() Avoids loading of more results.
protected void	prepareTuples(DataSource dataSource, List<List<RolapMember>> partialResult, List<List<RolapMember>> newPartialResult)
List<RolapMember>	readMembers(DataSource dataSource, List<List<RolapMember>> partialResult, List<List<RolapMember>> newPartialResult) Performs the read.
boolean	readNextTuple() Reads next tuple notifing all internal targets.
List<RolapMember[]>	readTuples(DataSource jdbcConnection, List<List<RolapMember>> partialResult, List<List<RolapMember>> newPartialResult) Performs the read.
void	setMaxRows(int maxRows)

Methods inherited from class java.lang.Object

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

Field Detail

maxRows

int maxRows

Constructor Detail

HighCardSqlTupleReader

public HighCardSqlTupleReader(TupleConstraint constraint)

Method Detail

addLevelMembers

public void addLevelMembers(RolapLevel level,
                            TupleReader.MemberBuilder memberBuilder,
                            List<RolapMember> srcMembers)

Description copied from interface: TupleReader

Adds a hierarchy to retrieve members from.

Specified by:

addLevelMembers in interface TupleReader

Overrides:

addLevelMembers in class SqlTupleReader

Parameters:

level - level that the members correspond to

memberBuilder - used to build new members for this level

srcMembers - if set, array of enumerated members that make up this level

getCacheKey

public Object getCacheKey()

Description copied from interface: TupleReader

Returns an object that uniquely identifies the Result that this TupleReader would return. Clients may use this as a key for caching the result.

Specified by:

getCacheKey in interface TupleReader

Overrides:

getCacheKey in class SqlTupleReader

getEnumTargetCount

public int getEnumTargetCount()

Overrides:

getEnumTargetCount in class SqlTupleReader

Returns:

number of targets that contain enumerated sets with calculated members

prepareTuples

protected void prepareTuples(DataSource dataSource,
                             List<List<RolapMember>> partialResult,
                             List<List<RolapMember>> newPartialResult)

Overrides:

prepareTuples in class SqlTupleReader

readMembers

public List<RolapMember> readMembers(DataSource dataSource,
                                     List<List<RolapMember>> partialResult,
                                     List<List<RolapMember>> newPartialResult)

Description copied from interface: TupleReader

Performs the read.

Specified by:

readMembers in interface TupleReader

Overrides:

readMembers in class SqlTupleReader

Parameters:

dataSource - source for reading tuples

partialResult - partially cached result that should be used instead of executing sql query

newPartialResult - if non-null, return the result of the read; note that this is a subset of the full return list

Returns:

a list of RolapMember

readTuples

public List<RolapMember[]> readTuples(DataSource jdbcConnection,
                                      List<List<RolapMember>> partialResult,
                                      List<List<RolapMember>> newPartialResult)

Description copied from interface: TupleReader

Performs the read.

Specified by:

readTuples in interface TupleReader

Overrides:

readTuples in class SqlTupleReader

Returns:

a list of RolapMember[]

noMoreRows

public void noMoreRows()

Avoids loading of more results.

readNextTuple

public boolean readNextTuple()

Reads next tuple notifing all internal targets.

Returns:

whether there are any more rows

setMaxRows

public void setMaxRows(int maxRows)

Overrides:

setMaxRows in class SqlTupleReader

getMaxRows

public int getMaxRows()

Overrides:

getMaxRows in class SqlTupleReader