org.datavec.api.transform.transform.column

Class DuplicateColumnsTransform

java.lang.Object

org.datavec.api.transform.transform.column.DuplicateColumnsTransform

All Implemented Interfaces:

Serializable, ColumnOp, Transform

public class DuplicateColumnsTransform
extends Object
implements Transform, ColumnOp

Duplicate one or more columns. The duplicated columns are placed immediately after the original columns

Author:

Alex Black

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DuplicateColumnsTransform(List<String> columnsToDuplicate, List<String> newColumnNames)

Method Summary

Modifier and Type	Method and Description
String	columnName() Returns a singular column name this op is meant to run on
String[]	columnNames() Returns column names this op is meant to run on
boolean	equals(Object o)
Schema	getInputSchema() Getter for input schema
int	hashCode()
List<Writable>	map(List<Writable> writables) Transform a writable in to another writable
Object	map(Object input) Transform an object in to another object
List<List<Writable>>	mapSequence(List<List<Writable>> sequence) Transform a sequence
Object	mapSequence(Object sequence) Transform a sequence
String	outputColumnName() The output column name after the operation has been applied
String[]	outputColumnNames() The output column names This will often be the same as the input
void	setInputSchema(Schema inputSchema) Set the input schema.
String	toString()
Schema	transform(Schema inputSchema) Get the output schema for this transformation, given an input schema

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DuplicateColumnsTransform

public DuplicateColumnsTransform(List<String> columnsToDuplicate,
                                 List<String> newColumnNames)

Parameters:

columnsToDuplicate - List of columns to duplicate

newColumnNames - List of names for the new (duplicate) columns

Method Detail

transform

public Schema transform(Schema inputSchema)

Description copied from interface: ColumnOp

Get the output schema for this transformation, given an input schema

Specified by:

transform in interface ColumnOp

setInputSchema

public void setInputSchema(Schema inputSchema)

Description copied from interface: ColumnOp

Set the input schema.

Specified by:

setInputSchema in interface ColumnOp

getInputSchema

public Schema getInputSchema()

Description copied from interface: ColumnOp

Getter for input schema

Specified by:

getInputSchema in interface ColumnOp

Returns:

map

public List<Writable> map(List<Writable> writables)

Description copied from interface: Transform

Transform a writable in to another writable

Specified by:

map in interface Transform

Parameters:

writables - the record to transform

Returns:

the transformed writable

mapSequence

public List<List<Writable>> mapSequence(List<List<Writable>> sequence)

Description copied from interface: Transform

Transform a sequence

Specified by:

mapSequence in interface Transform

map

public Object map(Object input)

Transform an object in to another object

Specified by:

map in interface Transform

Parameters:

input - the record to transform

Returns:

the transformed writable

mapSequence

public Object mapSequence(Object sequence)

Transform a sequence

Specified by:

mapSequence in interface Transform

Parameters:

sequence -

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

outputColumnName

public String outputColumnName()

The output column name after the operation has been applied

Specified by:

outputColumnName in interface ColumnOp

Returns:

the output column name

outputColumnNames

public String[] outputColumnNames()

The output column names This will often be the same as the input

Specified by:

outputColumnNames in interface ColumnOp

Returns:

the output column names

columnNames

public String[] columnNames()

Returns column names this op is meant to run on

Specified by:

columnNames in interface ColumnOp

Returns:

columnName

public String columnName()

Returns a singular column name this op is meant to run on

Specified by:

columnName in interface ColumnOp

Returns: