edu.udo.cs.miningmart.operator
Class MergeAttributes

java.lang.Object
  edu.udo.cs.miningmart.operator.ExecutableOperator
      edu.udo.cs.miningmart.operator.FeatureConstruction
          edu.udo.cs.miningmart.operator.MergeAttributes

public class MergeAttributes
extends FeatureConstruction

This operator merges two attributes. It is intended for sparsely populated attributes (with many NULL values, say at least 95 per cent). The target attribute is merged with the 'AttributeToMerge'. Whereever one attribute has a value while the other has NULL, the value appears in the output attribute. Whereever both attributes have a value, either the target attribute wins, or a new value is introduced that represents this combination of values. This depends on the entry in parameter 'ClashResolvation'. The attributes to be merged must be CATEGORIAL; numeric attributes have to be discretised first.

Version:

$Id: MergeAttributes.java,v 1.3 2006/09/27 14:59:55 euler Exp $

Author:

Timm Euler

Field Summary

static java.lang.String	PARAMETER_CLASH_RESOLVE
static java.lang.String	PARAMETER_MERGE_ATTRIB

Constructor Summary

MergeAttributes()

Method Summary

java.lang.String

generateSQL(Column targetAttributeColumn) Abstract method to be implemented by all subclasses.

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

compileStatement, createStatement, execute, generateColumnForOp, getCurrentLoopNumber, getTheInputConcept, getTheOutputAttribute, getTheOutputAttribute, getTheTargetAttribute, getTheTargetAttribute, load, writeResults

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

autoPrint, checkConditions, doPrint, doPrint, 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, print, putM4ObjectToCache, showCreateStatement, storedProceduresAvailable

Methods inherited from class java.lang.Object

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

Field Detail

PARAMETER_MERGE_ATTRIB

public static final java.lang.String PARAMETER_MERGE_ATTRIB

See Also:

Constant Field Values

PARAMETER_CLASH_RESOLVE

public static final java.lang.String PARAMETER_CLASH_RESOLVE

See Also:

Constant Field Values

Constructor Detail

MergeAttributes

public MergeAttributes()

Method Detail

generateSQL

public java.lang.String generateSQL(Column targetAttributeColumn)
                             throws M4CompilerError

Description copied from class: FeatureConstruction

Abstract method to be implemented by all subclasses. In this method the SQL definition for the Column which this operator creates is created.

Specified by:

generateSQL in class FeatureConstruction

Parameters:

targetAttributeColumn - The Column to which this FeatureConstruction Operator is applied. Some subclasses may ignore this parameter.

Returns:

An SQL definition for the newly constructed Column.

Throws:

M4CompilerError - A simple exception object with an error message.