org.datavec.api.transform.transform

Class BaseColumnTransform

java.lang.Object

org.datavec.api.transform.transform.BaseTransform

org.datavec.api.transform.transform.BaseColumnTransform

All Implemented Interfaces:

Serializable, ColumnOp, Transform

Direct Known Subclasses:

AppendStringColumnTransform, BaseDoubleTransform, BaseIntegerTransform, BaseStringTransform, DoubleMathOpTransform, IntegerMathOpTransform, IntegerToCategoricalTransform, LongMathOpTransform, NDArrayMathFunctionTransform, NDArrayScalarOpTransform, StringToCategoricalTransform, StringToTimeTransform, TimeMathOpTransform

public abstract class BaseColumnTransform
extends BaseTransform
implements ColumnOp

Map the values in a single column to new values. For example: string -> string, or empty -> x type transforms for a single column

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected String	columnName
protected int	columnNumber

Fields inherited from class org.datavec.api.transform.transform.BaseTransform

inputSchema

Constructor Summary

Constructors

Constructor and Description
BaseColumnTransform(String columnName)

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)
abstract ColumnMetaData	getNewColumnMetaData(String newName, ColumnMetaData oldColumnType)
int	hashCode()
List<Writable>	map(List<Writable> writables) Transform a writable in to another writable
abstract Writable	map(Writable columnWritable)
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.
abstract String	toString()
Schema	transform(Schema schema) Get the output schema for this transformation, given an input schema

Methods inherited from class org.datavec.api.transform.transform.BaseTransform

getInputSchema, mapSequence

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.datavec.api.transform.ColumnOp

getInputSchema

Methods inherited from interface org.datavec.api.transform.Transform

map

Field Detail

columnName

protected String columnName

columnNumber

protected int columnNumber

Constructor Detail

BaseColumnTransform

public BaseColumnTransform(String columnName)

Method Detail

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

transform

public Schema transform(Schema schema)

Description copied from interface: ColumnOp

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

Specified by:

transform in interface ColumnOp

getNewColumnMetaData

public abstract ColumnMetaData getNewColumnMetaData(String newName,
                                                    ColumnMetaData oldColumnType)

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

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:

map

public abstract Writable map(Writable columnWritable)

toString

public abstract String toString()

Specified by:

toString in class BaseTransform

equals

public boolean equals(Object o)

Overrides:

equals in class Object

mapSequence

public Object mapSequence(Object sequence)

Transform a sequence

Specified by:

mapSequence in interface Transform

Parameters:

sequence -

hashCode

public int hashCode()

Overrides:

hashCode in class Object