org.datavec.api.transform.transform.string

Class ConcatenateStringColumns

java.lang.Object

org.datavec.api.transform.transform.BaseTransform

org.datavec.api.transform.transform.string.ConcatenateStringColumns

All Implemented Interfaces:

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

public class ConcatenateStringColumns
extends BaseTransform
implements ColumnOp

Concatenate values of one or more String columns into a new String column. Retains the constituent String columns so user must remove those manually, if desired. TODO: use new String Reduce functionality in DataVec?

Author:

dave@skymind.io

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ConcatenateStringColumns(String newColumnName, String delimiter, List<String> columnsToConcatenate)
ConcatenateStringColumns(String newColumnName, String delimiter, String... columnsToConcatenate)

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

ConcatenateStringColumns

public ConcatenateStringColumns(String newColumnName,
                                String delimiter,
                                String... columnsToConcatenate)

Parameters:

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

ConcatenateStringColumns

public ConcatenateStringColumns(String newColumnName,
                                String delimiter,
                                List<String> columnsToConcatenate)

Parameters:

columnsToConcatenate - 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

Overrides:

setInputSchema in class BaseTransform

getInputSchema

public Schema getInputSchema()

Description copied from interface: ColumnOp

Getter for input schema

Specified by:

getInputSchema in interface ColumnOp

Overrides:

getInputSchema in class BaseTransform

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

Overrides:

mapSequence in class BaseTransform

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()

Specified by:

toString in class BaseTransform

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: