Package tech.tablesaw.table

Class TableSlice

java.lang.Object

tech.tablesaw.table.Relation

tech.tablesaw.table.TableSlice

All Implemented Interfaces:

it.unimi.dsi.fastutil.ints.IntIterable, Iterable<Integer>

public class TableSlice
extends Relation
implements it.unimi.dsi.fastutil.ints.IntIterable

A TableSlice is a facade around a Relation that acts as a filter. Requests for data are forwarded to the underlying table.

A TableSlice is only good until the structure of the underlying table changes.

Constructor Summary

Constructors

Constructor	Description
TableSlice(Table table, Selection rowSelection)	Returns a new View constructed from the given table, containing only the rows represented by the bitmap

Method Summary

Modifier and Type	Method	Description
TableSlice	addColumns(Column<?>... column)
Table	asTable()
void	clear()	Clears all rows from this View, leaving the structure in place
Column<?>	column(int columnIndex)	Returns the column at columnIndex (0-based)
Column<?>	column(String columnName)	Returns the column with the given columnName, ignoring case
int	columnCount()	Returns the number of columns in the relation
int	columnIndex(Column column)	Returns the index of the given column
List<String>	columnNames()
List<Column<?>>	columns()	Returns a list of all the columns in the relation
Table	first(int nRows)
String	get(int r, int c)	Returns a String representing the value found at column index c and row index r
it.unimi.dsi.fastutil.ints.IntIterator	iterator()	Returns a 0 based int iterator for use with, for example, get().
String	name()	Returns the name of this relation
double	reduce(String numberColumnName, NumericAggregateFunction function)	Returns the result of applying the given function to the specified column
TableSlice	removeColumns(Column<?>... columns)	Removes the given columns from the receiver
int	rowCount()	Returns the number of rows in the relation
TableSlice	setName(String name)

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntIterable

forEach, forEach

Methods inherited from interface java.lang.Iterable

spliterator

Methods inherited from class java.lang.Object

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

Methods inherited from class tech.tablesaw.table.Relation

as, booleanColumn, booleanColumn, booleanColumns, categoricalColumn, categoricalColumn, columnIndex, columns, columns, columnsOfType, columnTypes, colWidths, containsColumn, dateColumn, dateColumn, dateColumns, dateTimeColumn, dateTimeColumn, dateTimeColumns, doubleColumn, doubleColumn, doubleColumns, getUnformatted, isEmpty, nCol, nCol, numberColumn, numberColumn, numberColumns, print, print, printAll, removeColumns, removeColumns, shape, stringColumn, stringColumn, stringColumns, structure, summary, timeColumn, timeColumn, timeColumns, toString

Constructor Detail

TableSlice

public TableSlice(Table table,
                  Selection rowSelection)

Returns a new View constructed from the given table, containing only the rows represented by the bitmap

Method Detail

column

public Column<?> column(int columnIndex)

Description copied from class: Relation

Returns the column at columnIndex (0-based)

Specified by:

column in class Relation

Parameters:

columnIndex - an integer at least 0 and less than number of columns in the relation

Returns:

the column at the given index

column

public Column<?> column(String columnName)

Description copied from class: Relation

Returns the column with the given columnName, ignoring case

Overrides:

column in class Relation

columnCount

public int columnCount()

Description copied from class: Relation

Returns the number of columns in the relation

Specified by:

columnCount in class Relation

rowCount

public int rowCount()

Description copied from class: Relation

Returns the number of rows in the relation

Specified by:

rowCount in class Relation

columns

public List<Column<?>> columns()

Description copied from class: Relation

Returns a list of all the columns in the relation

Specified by:

columns in class Relation

columnIndex

public int columnIndex(Column column)

Description copied from class: Relation

Returns the index of the given column

Specified by:

columnIndex in class Relation

get

public String get(int r,
                  int c)

Description copied from class: Relation

Returns a String representing the value found at column index c and row index r

Specified by:

get in class Relation

name

public String name()

Description copied from class: Relation

Returns the name of this relation

Specified by:

name in class Relation

clear

public void clear()

Clears all rows from this View, leaving the structure in place

Specified by:

clear in class Relation

columnNames

public List<String> columnNames()

Specified by:

columnNames in class Relation

addColumns

public TableSlice addColumns(Column<?>... column)

Specified by:

addColumns in class Relation

removeColumns

public TableSlice removeColumns(Column<?>... columns)

Description copied from class: Relation

Removes the given columns from the receiver

Specified by:

removeColumns in class Relation

first

public Table first(int nRows)

Specified by:

first in class Relation

setName

public TableSlice setName(String name)

Specified by:

setName in class Relation

asTable

public Table asTable()

reduce

public double reduce(String numberColumnName,
                     NumericAggregateFunction function)

Returns the result of applying the given function to the specified column

Parameters:

numberColumnName - The name of a numeric column in this table

function - A numeric reduce function

Returns:

the function result

Throws:

IllegalArgumentException - if numberColumnName doesn't name a numeric column in this table

iterator

public it.unimi.dsi.fastutil.ints.IntIterator iterator()

Returns a 0 based int iterator for use with, for example, get(). When it returns 0 for the first row, get will transform that to the 0th row in the selection, which may not be the 0th row in the underlying table.

Specified by:

iterator in interface it.unimi.dsi.fastutil.ints.IntIterable

Specified by:

iterator in interface Iterable<Integer>