Package weka.core.pmml

Class Constant

java.lang.Object

weka.core.pmml.Expression

weka.core.pmml.Constant

All Implemented Interfaces:

Serializable

public class Constant
extends Expression

Class encapsulating a Constant Expression.

Version:

$Revision 1.0 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Constant(Element constant, FieldMetaInfo.Optype opType, ArrayList<Attribute> fieldDefs)	Construct an new Constant Expression.

Method Summary

Modifier and Type	Method	Description
double	getResult(double[] incoming)	Get the result of evaluating the expression.
String	getResultCategorical(double[] incoming)	Gets the result of evaluating the expression when the optype is categorical or ordinal as the actual String value.
static void	main(String[] args)
String	toString(String pad)

Methods inherited from class weka.core.pmml.Expression

getExpression, getExpression, getFieldDef, getFieldDefIndex, getOptype, getResultContinuous, setFieldDefs, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Constant

public Constant(Element constant,
 FieldMetaInfo.Optype opType,
 ArrayList<Attribute> fieldDefs)
         throws Exception

Construct an new Constant Expression.

Parameters:

constant - the xml Element containing the Constant

opType - the optype for the Constant

fieldDefs - an ArrayList of Attributes for the fields that this Expression might need to access (not needed for a constant!)

Throws:

Exception - if the optype is specified as continuous and there is a problem parsing the value of the Constant

Method Details

getResult

public double getResult(double[] incoming)

Get the result of evaluating the expression. In the case of a continuous optype, a real number is returned; in the case of a categorical/ordinal optype, the index of the nominal value is returned as a double.

Specified by:

getResult in class Expression

Parameters:

incoming - the incoming parameter values

Returns:

the result of evaluating the expression

getResultCategorical

public String getResultCategorical(double[] incoming)
                            throws Exception

Gets the result of evaluating the expression when the optype is categorical or ordinal as the actual String value.

Specified by:

getResultCategorical in class Expression

Parameters:

incoming - the incoming parameter values

Returns:

the result of evaluating the expression

Throws:

Exception - if the optype is continuous

main

public static void main(String[] args)

toString

public String toString(String pad)

Overrides:

toString in class Expression