Class Discretize

  • All Implemented Interfaces:
    java.io.Serializable

    public class Discretize
    extends Expression
    Class encapsulating a Discretize Expression.
    Version:
    $Revision 1.0 $
    Author:
    Mark Hall (mhall{[at]}pentaho{[dot]}com)
    See Also:
    Serialized Form
    • Constructor Detail

      • Discretize

        public Discretize​(org.w3c.dom.Element discretize,
                          FieldMetaInfo.Optype opType,
                          java.util.ArrayList<Attribute> fieldDefs)
                   throws java.lang.Exception
        Constructs a Discretize Expression
        Parameters:
        discretize - the Element containing the discretize expression
        opType - the optype of this Discretize Expression
        fieldDefs - the structure of the incoming fields
        Throws:
        java.lang.Exception - if the optype is not categorical/ordinal or if there is a problem parsing this element
    • Method Detail

      • setFieldDefs

        public void setFieldDefs​(java.util.ArrayList<Attribute> fieldDefs)
                          throws java.lang.Exception
        Set the field definitions for this Expression to use
        Overrides:
        setFieldDefs in class Expression
        Parameters:
        fieldDefs - the field definitions to use
        Throws:
        java.lang.Exception - if there is a problem setting the field definitions
      • getResult

        public double getResult​(double[] incoming)
                         throws java.lang.Exception
        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
        Throws:
        java.lang.Exception - if there is a problem computing the result
      • getResultCategorical

        public java.lang.String getResultCategorical​(double[] incoming)
                                              throws java.lang.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:
        java.lang.Exception - if the optype is continuous
      • toString

        public java.lang.String toString​(java.lang.String pad)
        Overrides:
        toString in class Expression