de.unknownreality.dataframe

Class ColumnSelection

java.lang.Object

de.unknownreality.dataframe.ColumnSelection

public class ColumnSelection
extends Object

Constructor Summary

Constructors

Constructor and Description
ColumnSelection(DataFrame dataFrame, DataFrameColumn... columns)

Method Summary

Modifier and Type	Method and Description
DataFrame	allRows() Returns a dataframe containing the selected columns and all rows from the original dataframe.
DataFrame	where(FilterPredicate predicate) Returns a dataframe containing the selected columns and rows filtered by aFilterPredicate an input value.
DataFrame	where(String predicateString) Returns a dataframe containing the selected columns and rows filtered by a predicate an input value.
DataFrame	where(String colName, Comparable value) Returns a dataframe containing the selected columns and rows where a specified column value equals an input value.
DataFrame	whereIndex(String indexName, Comparable... values) Returns a dataframe containing the selected columns and rows found using a specified index an input value.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnSelection

public ColumnSelection(DataFrame dataFrame,
                       DataFrameColumn... columns)

Method Detail

where

public DataFrame where(String colName,
                       Comparable value)

Returns a dataframe containing the selected columns and rows where a specified column value equals an input value.

Parameters:

colName - column name

value - input value

Returns:

new dataframe

where

public DataFrame where(FilterPredicate predicate)

Returns a dataframe containing the selected columns and rows filtered by aFilterPredicate an input value.

Parameters:

predicate - input predicate

Returns:

new dataframe

where

public DataFrame where(String predicateString)

Returns a dataframe containing the selected columns and rows filtered by a predicate an input value.

Parameters:

predicateString - input predicate string

Returns:

new dataframe

whereIndex

public DataFrame whereIndex(String indexName,
                            Comparable... values)

Returns a dataframe containing the selected columns and rows found using a specified index an input value.

Parameters:

indexName - name of index

values - index values

Returns:

new dataframe

allRows

public DataFrame allRows()

Returns a dataframe containing the selected columns and all rows from the original dataframe.

Returns:

new dataframe