org.knime.base.node.preproc.groupby.aggregation
Class Operators

java.lang.Object
  extended by org.knime.base.node.preproc.groupby.aggregation.Operators

public final class Operators
extends Object

Contains all nominal aggregation operators.

Author:
Tobias Koetter, University of Konstanz

Nested Class Summary
(package private)  class Operators.ConcatenateOperator
          Returns the all values concatenated per group.
(package private)  class Operators.CountOperator
          Returns the count per group.
(package private)  class Operators.FirstOperator
          Returns the first element per group.
(package private)  class Operators.FirstValueOperator
          Returns the first value (ignores missing values) per group.
(package private)  class Operators.LastOperator
          Returns the last element per group.
(package private)  class Operators.LastValueOperator
          Returns the last value (ignores missing values) per group.
(package private)  class Operators.ListCellOperator
          Returns all values as a ListCell per group.
(package private)  class Operators.ModeOperator
          Returns the most frequent entry per group.
(package private)  class Operators.SetCellOperator
          Returns all values as a SetCell per group.
(package private)  class Operators.UniqueConcatenateOperator
          Returns the concatenation of all different values per group.
(package private)  class Operators.UniqueConcatenateWithCountOperator
          Returns the concatenation of all different values per group and the number of cells per distinct value.
(package private)  class Operators.UniqueCountOperator
          Returns the count of the unique values per group.
 
Method Summary
static Operators getInstance()
          Returns the only instance of this class.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

getInstance

public static Operators getInstance()
Returns the only instance of this class.

Returns:
the only instance


Copyright, 2003 - 2010. All rights reserved.
University of Konstanz, Germany.
Chair for Bioinformatics and Information Mining, Prof. Dr. Michael R. Berthold.
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