Package com.lumiomedical.etl.dataframe

Class Tables

java.lang.Object
com.lumiomedical.etl.dataframe.Tables
public final class Tables
extends Object
Author:
Pierre Lecerf ([email protected]) Created on 2020/08/24

  • Constructor Summary

    Constructors 
    Constructor Description
    Tables()  

  • Method Summary

    Modifier and Type Method Description
    static <T,​ C extends tech.tablesaw.columns.Column<T>>
    tech.tablesaw.api.Table    		 addColumnIfNotExists​(tech.tablesaw.api.Table table, String name, ColumnDescriptor<T,​C> descriptor)
    Adds a column of a given type if it doesn't already exist in the provided table.
    static boolean hasColumn​(tech.tablesaw.api.Table table, String name)
    This is just a shorthand for checking the existence of a column in a table by its name.
    static <T,​ C extends tech.tablesaw.columns.Column<T>>
    boolean    		 hasColumn​(tech.tablesaw.api.Table table, String name, ColumnDescriptor<?,​C> descriptor)  

    Methods inherited from class java.lang.Object

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

  • Constructor Details

  • Method Details

    • hasColumn

      public static boolean hasColumn​(tech.tablesaw.api.Table table, String name)
      This is just a shorthand for checking the existence of a column in a table by its name. The List.contains call is O(n) but since we're working on a Table we don't expect there to be more than a handful of dozen columns at the very most. If you do have many more columns in your table, try a different approach ; this method is just here to cover the most common cases.
      Parameters:
      table -
      name -
      Returns:

    • hasColumn

      public static <T,​ C extends tech.tablesaw.columns.Column<T>> boolean hasColumn​(tech.tablesaw.api.Table table, String name, ColumnDescriptor<?,​C> descriptor)
      Parameters:
      table -
      name -
      descriptor -
      Returns:

    • addColumnIfNotExists

      public static <T,​ C extends tech.tablesaw.columns.Column<T>> tech.tablesaw.api.Table addColumnIfNotExists​(tech.tablesaw.api.Table table, String name, ColumnDescriptor<T,​C> descriptor)
      Adds a column of a given type if it doesn't already exist in the provided table. If no column exists with the specified name, we create one of the appropriate type. Otherwise, we check if the existing one has the appropriate type, in which case we return it, otherwise we throw an exception.
      Type Parameters:
      T -
      C -
      Parameters:
      table -
      name -
      descriptor -
      Returns: