Class FieldRef

All Implemented Interfaces:
Serializable

public class FieldRef extends Expression
Class encapsulating a FieldRef Expression. Is simply a pass-through to an existing field.
Version:
$Revision 1.0 $
Author:
Mark Hall (mhall{[at]}pentaho{[dot]}com)
See Also:
  • Constructor Details

  • Method Details

    • setFieldDefs

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

      public double getResult(double[] incoming) throws Exception
      Description copied from class: Expression
      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:
      Exception - if there is a problem computing the result
    • getResultCategorical

      public String getResultCategorical(double[] incoming) throws Exception
      Description copied from class: Expression
      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
    • getOutputDef

      public Attribute getOutputDef()
      Return the structure of the result of applying this Expression as an Attribute.
      Returns:
      the structure of the result of applying this Expression as an Attribute.
    • toString

      public String toString(String pad)
      Overrides:
      toString in class Expression