org.datavec.api.transform.transform.column

Class ReorderColumnsTransform

java.lang.Object

org.datavec.api.transform.transform.column.ReorderColumnsTransform

All Implemented Interfaces:

Serializable, ColumnOp, Operation<Schema,Schema>, Transform

public class ReorderColumnsTransform
extends Object
implements Transform, ColumnOp

Rearrange the order of the columns. Note: A partial list of columns can be used here. Any columns that are not explicitly mentioned will be placed after those that are in the output, without changing their relative order.

Author:

Alex Black

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ReorderColumnsTransform(List<String> newOrder)
ReorderColumnsTransform(String... newOrder)

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)

Methods inherited from class java.lang.Object

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

Constructor Detail

ReorderColumnsTransform

public ReorderColumnsTransform(String... newOrder)

Parameters:

newOrder - A partial or complete order of the columns in the output

ReorderColumnsTransform

public ReorderColumnsTransform(List<String> newOrder)

Parameters:

newOrder - A partial or complete order of the columns in the output

Method Detail

transform

public Schema transform(Schema inputSchema)

Specified by:

transform in interface Operation<Schema,Schema>

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 -

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString 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: