edu.udo.cs.miningmart.operator
Class RowSelectionByRandomSampling

java.lang.Object
  edu.udo.cs.miningmart.operator.ExecutableOperator
      edu.udo.cs.miningmart.operator.ConceptOperator
          edu.udo.cs.miningmart.operator.SingleCSOperator
              edu.udo.cs.miningmart.operator.RowSelection
                  edu.udo.cs.miningmart.operator.RowSelectionByRandomSampling

public final class RowSelectionByRandomSampling
extends RowSelection

This operator randomly selects rows with a probability that is computed such that roughly as many rows are selected as are given in the parameter HowMany.

Version:

$Id: RowSelectionByRandomSampling.java,v 1.5 2006/09/27 14:59:55 euler Exp $

Author:

Timm Euler

Field Summary

Fields inherited from class edu.udo.cs.miningmart.operator.ConceptOperator

suffixForIntermediateViews

Fields inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator

generatedSQLDefinitions

Constructor Summary

RowSelectionByRandomSampling()

Method Summary

java.lang.String	generateConditionForOp() Abstract method to be implemented by all subclasses.
java.lang.String	generateSQLDefinition(java.lang.String selectPart) Overrides the method from RowSelection because an own definition format is needed.
int	getHowMany()
java.lang.String	getTypeOfNewColumnSet() Overrides the method from RowSelection because for Sampling a table is more efficient.

Methods inherited from class edu.udo.cs.miningmart.operator.RowSelection

mustCopyFeature

Methods inherited from class edu.udo.cs.miningmart.operator.SingleCSOperator

generateColumnSetsForOp, generateSQLDefinition, getNewCSName, getTypeOfNewColumnSet, handleExtraOutputFeature

Methods inherited from class edu.udo.cs.miningmart.operator.ConceptOperator

compileStatement, createMetadata, createMetadataForOneBA, createSingleColumnSet, createStatement, generateColumns, getInputConcept, getNewCSName, getOutputConcept, getStringForSelection, setNewCSMultiStepBranch

Methods inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator

autoPrint, checkConditions, doPrint, doPrint, execute, executeBusinessSingleValueSqlRead, executeBusinessSingleValueSqlReadL, executeBusinessSqlRead, executeBusinessSqlWrite, executeM4SingleValueSqlRead, executeM4SingleValueSqlReadL, executeM4SqlRead, executeM4SqlWrite, getArtificalColumnName, getBusinessDbms, getHighestLoopNr, getM4Db, getM4Dbms, getM4ObjectFromCache, getName, getNextM4SequenceValue, getNumberOfLoops, getOperator, getOpParamsIterator, getParameter, getParameter, getParameterObjectsOfAllLoops, getSingleParameter, getSingleParameter, getStep, giveWarningForChangedInputData, handleAssertions, isDeselectedParameter, isLoopable, isManual, isStepable, load, print, putM4ObjectToCache, showCreateStatement, storedProceduresAvailable

Methods inherited from class java.lang.Object

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

Constructor Detail

RowSelectionByRandomSampling

public RowSelectionByRandomSampling()

Method Detail

generateSQLDefinition

public java.lang.String generateSQLDefinition(java.lang.String selectPart)
                                       throws M4CompilerError

Overrides the method from RowSelection because an own definition format is needed.

Overrides:

generateSQLDefinition in class RowSelection

Parameters:

selectPart - The SQL string between "SELECT" and "FROM" for the SQL definition to be returned.

Returns:

The SQL definition for the new ColumnSet.

Throws:

M4CompilerError

See Also:

edu.udo.cs.miningmart.m4.core.operator.SingleCSOperator#generateSQLDefinition(String), edu.udo.cs.miningmart.m4.core.operator.RowSelection#generateSQLDefinition(String)

generateConditionForOp

public java.lang.String generateConditionForOp()

Description copied from class: RowSelection

Abstract method to be implemented by all subclasses. Must return the String for the WHERE part of the SQL definition of the output columnset.

Specified by:

generateConditionForOp in class RowSelection

Returns:

the WHERE condition

getTypeOfNewColumnSet

public java.lang.String getTypeOfNewColumnSet()

Overrides the method from RowSelection because for Sampling a table is more efficient.

Overrides:

getTypeOfNewColumnSet in class RowSelection

Returns:

The type of the new Columnset, either "V" or "T".

See Also:

edu.udo.cs.miningmart.m4.core.operator.ConceptOperator#getTypeOfNewColumnSet(int)

getHowMany

public int getHowMany()
               throws M4CompilerError

Throws:

M4CompilerError