edu.udo.cs.miningmart.operator
Class RemoveDuplicates

java.lang.Object
  extended byedu.udo.cs.miningmart.operator.ExecutableOperator
      extended byedu.udo.cs.miningmart.operator.ConceptOperator
          extended byedu.udo.cs.miningmart.operator.SingleCSOperator
              extended byedu.udo.cs.miningmart.operator.RemoveDuplicates

public class RemoveDuplicates
extends SingleCSOperator

Creates a view on the input table/view that contains no two equal tuples (rows).

Version:
$Id: RemoveDuplicates.java,v 1.3 2006/04/11 14:10:11 euler Exp $
Author:
Timm Euler

Field Summary
 
Fields inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator
generatedSQLDefinitions
 
Constructor Summary
RemoveDuplicates()
           
 
Method Summary
 java.lang.String generateSQLDefinition(java.lang.String selectPart)
          This method must return the SQL definition of the newly created ColumnSet.
protected  java.lang.String getStringForSelection(Column inputColumn)
          The superclass method is overwritten in order to create a correct SELECT String that matches the internal FROM part.
 java.lang.String getTypeOfNewColumnSet()
          This method must return the entry String for the M4 table "Columnset_t", indicating whether the new Columnset is a view or a table.
protected  boolean mustCopyFeature(java.lang.String nameOfFeature)
          This method is for operators that do not copy all Features of the input concept to the output concept.
 
Methods inherited from class edu.udo.cs.miningmart.operator.SingleCSOperator
generateColumnSetsForOp, generateSQLDefinition, getNewCSName, getTypeOfNewColumnSet
 
Methods inherited from class edu.udo.cs.miningmart.operator.ConceptOperator
compileStatement, createMetadata, createMetadataForOneBA, createSingleColumnSet, createStatement, estimateStatistics, generateColumns, getInputConcept, getNewCSName, getOutputConcept, 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, getSingleParameter, getSingleParameter, getStep, 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

RemoveDuplicates

public RemoveDuplicates()
Method Detail

generateSQLDefinition

public java.lang.String generateSQLDefinition(java.lang.String selectPart)
                                       throws M4CompilerError
Description copied from class: SingleCSOperator
This method must return the SQL definition of the newly created ColumnSet.

Specified by:
generateSQLDefinition in class SingleCSOperator
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)

getStringForSelection

protected java.lang.String getStringForSelection(Column inputColumn)
The superclass method is overwritten in order to create a correct SELECT String that matches the internal FROM part.

Overrides:
getStringForSelection in class ConceptOperator
Parameters:
inputColumn - the given input column
Returns:
a String for the SELECT part of a view definition

getTypeOfNewColumnSet

public java.lang.String getTypeOfNewColumnSet()
Description copied from class: SingleCSOperator
This method must return the entry String for the M4 table "Columnset_t", indicating whether the new Columnset is a view or a table.

Specified by:
getTypeOfNewColumnSet in class SingleCSOperator
Returns:
The type of the new Columnset, either "V" or "T".
See Also:
edu.udo.cs.miningmart.m4.core.operator.ConceptOperator#getTypeOfNewColumnSet(int)

mustCopyFeature

protected boolean mustCopyFeature(java.lang.String nameOfFeature)
Description copied from class: ConceptOperator
This method is for operators that do not copy all Features of the input concept to the output concept.

Specified by:
mustCopyFeature in class ConceptOperator
Parameters:
nameOfFeature - Name of the feature in question.
Returns:
TRUE if this feature should be copied to the output concept, FALSE if not.
See Also:
edu.udo.cs.miningmart.m4.core.operator.ConceptOperator#mustCopyFeature(String)


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