net.sf.farrago.namespace.ftrs
Class FtrsDataServer.FtrsColumnMetadata

java.lang.Object
  net.sf.farrago.namespace.impl.MedAbstractColumnMetadata
      net.sf.farrago.namespace.ftrs.FtrsDataServer.FtrsColumnMetadata

Enclosing class:

FtrsDataServer

private static class FtrsDataServer.FtrsColumnMetadata
extends MedAbstractColumnMetadata

Constructor Summary

private

FtrsDataServer.FtrsColumnMetadata()

Method Summary

protected int	mapColumnToField(RelNode rel, FemAbstractColumn keyCol) Maps a FemAbstractColumn to its corresponding field reference in the RelNode.
protected FemAbstractColumn	mapFieldToColumn(RelNode rel, int fieldNo) Maps a field reference to its underlying FemAbstractColumn
protected int	mapFieldToColumnOrdinal(RelNode rel, int fieldNo) Maps a field reference to the underlying column ordinal corresponding to the FemAbstractColumn representing the column.

Methods inherited from class net.sf.farrago.namespace.impl.MedAbstractColumnMetadata

areColumnsUnique, areColumnsUnique, areColumnsUniqueForKeys, getDistinctRowCount, getPopulationSize, getUniqueKeys, getUniqueKeys

Methods inherited from class java.lang.Object

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

Constructor Detail

FtrsDataServer.FtrsColumnMetadata

private FtrsDataServer.FtrsColumnMetadata()

Method Detail

mapColumnToField

protected int mapColumnToField(RelNode rel,
                               FemAbstractColumn keyCol)

Description copied from class: MedAbstractColumnMetadata

Maps a FemAbstractColumn to its corresponding field reference in the RelNode.

Specified by:

mapColumnToField in class MedAbstractColumnMetadata

Parameters:

rel - RelNode corresponding to the column

keyCol - the column whose field ordinal will be returned

Returns:

field ordinal relative to the RelNode; -1 if the column is not accessed by the RelNode

mapFieldToColumnOrdinal

protected int mapFieldToColumnOrdinal(RelNode rel,
                                      int fieldNo)

Description copied from class: MedAbstractColumnMetadata

Maps a field reference to the underlying column ordinal corresponding to the FemAbstractColumn representing the column.

Specified by:

mapFieldToColumnOrdinal in class MedAbstractColumnMetadata

Parameters:

rel - RelNode corresponding to the column

fieldNo - the ordinal of the field reference

Returns:

column ordinal of the underlying FemAbstractColumn; -1 if the column does not map to actual FemAbstractColumn

mapFieldToColumn

protected FemAbstractColumn mapFieldToColumn(RelNode rel,
                                             int fieldNo)

Description copied from class: MedAbstractColumnMetadata

Maps a field reference to its underlying FemAbstractColumn

Specified by:

mapFieldToColumn in class MedAbstractColumnMetadata

Parameters:

rel - RelNode corresponding to the field

fieldNo - the ordinal of the field reference

Returns:

underlying FemAbstractColumn; null if no underlying FemAbstractColumn