tech.tablesaw.table

Class TableSliceGroup

java.lang.Object

tech.tablesaw.table.TableSliceGroup

All Implemented Interfaces:

Iterable<TableSlice>

Direct Known Subclasses:

SelectionTableSliceGroup, StandardTableSliceGroup

public class TableSliceGroup
extends Object
implements Iterable<TableSlice>

A group of tables formed by performing splitting operations on an original table

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	SPLIT_STRING

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TableSliceGroup(Table original) Returns an instance for calculating a single summary for the given table, with no sub-groupings
protected	TableSliceGroup(Table sourceTable, String[] groupColumnNames) Returns an instance for calculating subgroups, one for each combination of the given groupColumnNames that appear in the source table

Method Summary

Modifier and Type	Method and Description
protected void	addSlice(TableSlice slice)
Table	aggregate(com.google.common.collect.ListMultimap<String,AggregateFunction<?,?>> functions) Applies the given aggregations to the given columns.
Table	aggregate(String colName1, AggregateFunction<?,?>... functions) Applies the given aggregation to the given column.
static String	aggregateColumnName(String columnName, String functionName) Returns a column name for aggregated data based on the given source column name and function
List<Table>	asTableList() Returns a list of Tables created by reifying my list of slices (views) over the original table
TableSlice	get(int i)
protected int	getByteSize(List<Column<?>> columns)
List<TableSlice>	getSlices()
Table	getSourceTable()
protected String[]	getSplitColumnNames()
Iterator<TableSlice>	iterator() Returns an iterator over elements of type T.
protected void	setSourceTable(Table sourceTable)
int	size() Returns the number of slices
static Table	summaryTableName(Table source)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

SPLIT_STRING

protected static final String SPLIT_STRING

See Also:

Constant Field Values

Constructor Detail

TableSliceGroup

protected TableSliceGroup(Table original)

Returns an instance for calculating a single summary for the given table, with no sub-groupings

TableSliceGroup

protected TableSliceGroup(Table sourceTable,
                          String[] groupColumnNames)

Returns an instance for calculating subgroups, one for each combination of the given groupColumnNames that appear in the source table

Method Detail

getSplitColumnNames

protected String[] getSplitColumnNames()

getByteSize

protected int getByteSize(List<Column<?>> columns)

addSlice

protected void addSlice(TableSlice slice)

getSlices

public List<TableSlice> getSlices()

get

public TableSlice get(int i)

getSourceTable

public Table getSourceTable()

size

public int size()

Returns the number of slices

aggregate

public Table aggregate(String colName1,
                       AggregateFunction<?,?>... functions)

Applies the given aggregation to the given column. The apply and combine steps of a split-apply-combine.

aggregate

public Table aggregate(com.google.common.collect.ListMultimap<String,AggregateFunction<?,?>> functions)

Applies the given aggregations to the given columns. The apply and combine steps of a split-apply-combine.

Parameters:

functions - map from column name to aggregation to apply on that function

summaryTableName

public static Table summaryTableName(Table source)

iterator

public Iterator<TableSlice> iterator()

Returns an iterator over elements of type T.

Specified by:

iterator in interface Iterable<TableSlice>

Returns:

an Iterator.

aggregateColumnName

public static String aggregateColumnName(String columnName,
                                         String functionName)

Returns a column name for aggregated data based on the given source column name and function

asTableList

public List<Table> asTableList()

Returns a list of Tables created by reifying my list of slices (views) over the original table

setSourceTable

protected void setSourceTable(Table sourceTable)