edu.udo.cs.miningmart.operator
Class Union

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.Union

public class Union

extends SingleCSOperator

This operator provides a UNION of Concepts as part of SQL at the relational level. So far no mapping is supported within the operator.

Version:

$Id: Union.java,v 1.4 2006/04/11 14:10:11 euler Exp $

Author:

Martin Scholz

Field Summary

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

generatedSQLDefinitions

Constructor Summary

Union()

Method Summary

java.lang.String	generateSQLDefinition(java.lang.String selectPart) This method must return the SQL definition of the newly created ColumnSet.
java.lang.String	getDataMode() Getter for the parameter "DataMode"
Concept[]	getTheConcepts() Getter for the parameter "TheConcepts"
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) All output features should have a column of the same type as their corresponding feature in the input concept (unless the input concept's feature was deselected).

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, 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, 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

Union

public Union()

Method Detail

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:

SingleCSOperator.getTypeOfNewColumnSet()

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:

SingleCSOperator.generateSQLDefinition(String)

mustCopyFeature

protected boolean mustCopyFeature(java.lang.String nameOfFeature)
                           throws M4CompilerError

All output features should have a column of the same type as their corresponding feature in the input concept (unless the input concept's feature was deselected).

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.

Throws:

M4CompilerError

See Also:

ConceptOperator.mustCopyFeature(String)

getTheConcepts

public Concept[] getTheConcepts()
                         throws M4CompilerError

Getter for the parameter "TheConcepts"

Returns:

an array of Concept objects

Throws:

M4CompilerError

getDataMode

public java.lang.String getDataMode()
                             throws M4CompilerError

Getter for the parameter "DataMode"

Returns:

one of the two String objects DATAMODE_SET or DATAMODE_BAG indicating the mode.

Throws:

M4CompilerError