de.unknownreality.dataframe.join

Class AbstractJoin

java.lang.Object

de.unknownreality.dataframe.join.AbstractJoin

Direct Known Subclasses:

DirectionJoin, InnerJoin

public abstract class AbstractJoin
extends Object

Created by Alex on 10.07.2016.

Constructor Summary

Constructors

Constructor and Description
AbstractJoin()

Method Summary

Modifier and Type	Method and Description
void	appendGroupJoinedRows(DataGroup group, DataFrame dfA, DataFrame dfB, DataRow rowA, JoinInfo joinInfo, DataFrameHeader joinHeader, List<DataRow> joinedRows) Appends the joined rows resulting from a row from one data frame and a data group from the other data frame
JoinInfo	fillJoinHeader(DataFrameHeader joinHeader, DataFrame dfA, DataFrame dfB, JoinColumn[] joinColumns, String suffixA, String suffixB) Fills a join header with the header information of two data frames.
void	fillNA(Comparable[] joinedRowValues) Fills an value array with Values.NA
void	fillValues(DataFrame dataFrame, DataRow row, JoinInfo joinInfo, Comparable[] joinedRowValues) Fills the values of a row into the corresponding values in a joined row value
abstract JoinedDataFrame	join(DataFrame dfA, DataFrame dfB, String joinSuffixA, String joinSuffixB, JoinColumn... joinColumns)
void	setGroupValuesA(Comparable[] groupValues, Row<Comparable,String> row, JoinColumn[] joinColumns) Fills the join values of the first data frame into an values array
void	setGroupValuesB(Comparable[] groupValues, Row<Comparable,String> row, JoinColumn[] joinColumns) Fills the join values of the second data frame into an values array

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractJoin

public AbstractJoin()

Method Detail

join

public abstract JoinedDataFrame join(DataFrame dfA,
                                     DataFrame dfB,
                                     String joinSuffixA,
                                     String joinSuffixB,
                                     JoinColumn... joinColumns)

fillValues

public void fillValues(DataFrame dataFrame,
                       DataRow row,
                       JoinInfo joinInfo,
                       Comparable[] joinedRowValues)

Fills the values of a row into the corresponding values in a joined row value

Parameters:

dataFrame - parent data frame of row

row - row containing the values

joinInfo - info about the joined data frame

joinedRowValues - array that is filled with the row values

fillNA

public void fillNA(Comparable[] joinedRowValues)

Fills an value array with Values.NA

Parameters:

joinedRowValues - array with NA values

fillJoinHeader

public JoinInfo fillJoinHeader(DataFrameHeader joinHeader,
                               DataFrame dfA,
                               DataFrame dfB,
                               JoinColumn[] joinColumns,
                               String suffixA,
                               String suffixB)

Fills a join header with the header information of two data frames.
Headers that are used for the join are merged.
Headers with the same name in both data frames get a suffix.
The information about the join is returned after the header is filled.

Parameters:

joinHeader - join header to fill

dfA - first data frame

dfB - second data frame

joinColumns - columns used for the join

suffixA - suffix used for headers from the first data frame

suffixB - suffix used for headers from the second data frame

Returns:

information about the join

setGroupValuesA

public void setGroupValuesA(Comparable[] groupValues,
                            Row<Comparable,String> row,
                            JoinColumn[] joinColumns)

Fills the join values of the first data frame into an values array

Parameters:

groupValues - values array to be filled

row - row containing the values

joinColumns - columns used for the join

setGroupValuesB

public void setGroupValuesB(Comparable[] groupValues,
                            Row<Comparable,String> row,
                            JoinColumn[] joinColumns)

Fills the join values of the second data frame into an values array

Parameters:

groupValues - values array to be filled

row - row containing the values

joinColumns - columns used for the join

appendGroupJoinedRows

public void appendGroupJoinedRows(DataGroup group,
                                  DataFrame dfA,
                                  DataFrame dfB,
                                  DataRow rowA,
                                  JoinInfo joinInfo,
                                  DataFrameHeader joinHeader,
                                  List<DataRow> joinedRows)

Appends the joined rows resulting from a row from one data frame and a data group from the other data frame

Parameters:

group - data group a data frame

dfA - first data frame

dfB - second data frame

rowA - row from the other data frame (not the same as the data group)

joinInfo - info about the join

joinHeader - resulting data frame header

joinedRows - list of rows for the joined data frame