de.unknownreality.dataframe.join.impl

Class JoinOperationUtil

java.lang.Object

de.unknownreality.dataframe.join.impl.JoinOperationUtil

public class JoinOperationUtil
extends Object

Created by Alex on 10.07.2016.

Constructor Summary

Constructors

Constructor and Description
JoinOperationUtil()

Method Summary

Modifier and Type	Method and Description
static void	appendGroupJoinedRows(Collection<Integer> rowIndices, DataFrame dfB, DataRow rowA, int[] joinIndicesA, int[] joinIndicesB, int joinedSize, DataFrame joinedDataFrame) Appends the joined rows resulting from a row from one data frame and a data group from the other data frame
static JoinInfo	createJoinInfo(DataFrame dfA, DataFrame dfB, JoinColumn[] joinColumns, String suffixA, String suffixB) Fills a join header with the header information of two data frames.
static void	fillNA(Comparable<?>[] joinedRowValues) Fills an value array with Values.NA
static void	fillValues(int[] joinIndices, DataRow row, Comparable<?>[] joinedRowValues) Fills the values of a row into the corresponding values in a joined row value
static int[]	getJoinIndices(DataFrame dataFrame, JoinInfo joinInfo)

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinOperationUtil

public JoinOperationUtil()

Method Detail

fillValues

public static void fillValues(int[] joinIndices,
                              DataRow row,
                              Comparable<?>[] joinedRowValues)

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

Parameters:

joinIndices - indices of column from original dataframe in joined dataframe

row - row containing the values

joinedRowValues - array that is filled with the row values

getJoinIndices

public static int[] getJoinIndices(DataFrame dataFrame,
                                   JoinInfo joinInfo)

fillNA

public static void fillNA(Comparable<?>[] joinedRowValues)

Fills an value array with Values.NA

Parameters:

joinedRowValues - array with NA values

createJoinInfo

public static JoinInfo createJoinInfo(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:

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

appendGroupJoinedRows

public static void appendGroupJoinedRows(Collection<Integer> rowIndices,
                                         DataFrame dfB,
                                         DataRow rowA,
                                         int[] joinIndicesA,
                                         int[] joinIndicesB,
                                         int joinedSize,
                                         DataFrame joinedDataFrame)

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

Parameters:

rowIndices - row indices

dfB - second data frame

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

joinIndicesA - indices of column from first dataframe in joined dataframe

joinIndicesB - indices of column from second dataframe in joined dataframe

joinedSize - size of joined rows

joinedDataFrame - resulting joined data frame