org.datavec.api.transform.transform.column

Class AddConstantColumnTransform

java.lang.Object

org.datavec.api.transform.transform.column.AddConstantColumnTransform

All Implemented Interfaces:

Serializable, ColumnOp, Transform

public class AddConstantColumnTransform
extends Object
implements Transform

Add a new column, where the values in that column for all records are identical (according to the specified value)

Author:

Alex Black

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AddConstantColumnTransform(String newColumnName, ColumnType newColumnType, Writable fixedValue)

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
Schema	getInputSchema() Getter for input schema
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.
Schema	transform(Schema inputSchema) Get the output schema for this transformation, given an input schema

Methods inherited from class java.lang.Object

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

Constructor Detail

AddConstantColumnTransform

public AddConstantColumnTransform(String newColumnName,
                                  ColumnType newColumnType,
                                  Writable fixedValue)

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:

outputColumnName

public String outputColumnName()

Description copied from interface: ColumnOp

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()

Description copied from interface: ColumnOp

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()

Description copied from interface: ColumnOp

Returns column names this op is meant to run on

Specified by:

columnNames in interface ColumnOp

Returns:

columnName

public String columnName()

Description copied from interface: ColumnOp

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

Specified by:

columnName 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)

Description copied from interface: Transform

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)

Description copied from interface: Transform

Transform a sequence

Specified by:

mapSequence in interface Transform