Package com.leumanuel.woozydata.service

Class MergeService

java.lang.Object

com.leumanuel.woozydata.service.MergeService

public class MergeService
extends Object

Service class for merging and concatenating DataFrames. Provides various methods for combining data from multiple DataFrames.

Version:

1.0

Author:

Leu A. Manuel

Constructor Summary

Constructors

Constructor	Description
MergeService()

Method Summary

Modifier and Type	Method	Description
DataFrame	concat(DataFrame df1, DataFrame df2, boolean axis)	Concatenates two DataFrames either vertically or horizontally.
DataFrame	merge(DataFrame df1, DataFrame df2, String how, String... on)	Merges two DataFrames based on matching columns.
DataFrame	reshape(DataFrame df, int rows, int cols)	Reshapes DataFrame into specified dimensions.

Methods inherited from class java.lang.Object

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

Constructor Details

MergeService

public MergeService()

Method Details

merge

public DataFrame merge(DataFrame df1,
 DataFrame df2,
 String how,
 String... on)

Merges two DataFrames based on matching columns.

Parameters:

df1 - First DataFrame

df2 - Second DataFrame

how - Type of merge ("inner", "left", "right", "outer")

on - Columns to merge on

Returns:

Merged DataFrame

Throws:

IllegalArgumentException - if merge type is not supported

concat

public DataFrame concat(DataFrame df1,
 DataFrame df2,
 boolean axis)

Concatenates two DataFrames either vertically or horizontally.

Parameters:

df1 - First DataFrame

df2 - Second DataFrame

axis - true for vertical concatenation, false for horizontal

Returns:

Concatenated DataFrame

reshape

public DataFrame reshape(DataFrame df,
 int rows,
 int cols)

Reshapes DataFrame into specified dimensions.

Parameters:

df - DataFrame to reshape

rows - Number of rows in new shape

cols - Number of columns in new shape

Returns:

Reshaped DataFrame

Throws:

IllegalArgumentException - if dimensions mismatch