org.apache.pig
Interface LoadCaster

All Known Subinterfaces:

LoadStoreCaster, StoreCaster

All Known Implementing Classes:

HBaseBinaryConverter, TextLoader, Utf8StorageConverter

@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface LoadCaster

An interface that provides cast implementations for load functions. For casts between bytearray objects and internal types, Pig relies on the load function that loaded the data to provide the cast. This is because Pig does not understand the binary representation of the data and thus cannot cast it. This interface provides functions to cast from bytearray to each of Pig's internal types.

Since:

Pig 0.7

Method Summary

DataBag	bytesToBag(byte[] b, ResourceSchema.ResourceFieldSchema fieldSchema) Cast data from bytearray to bag value.
String	bytesToCharArray(byte[] b) Cast data from bytearray to chararray value.
Double	bytesToDouble(byte[] b) Cast data from bytearray to double value.
Float	bytesToFloat(byte[] b) Cast data from bytearray to float value.
Integer	bytesToInteger(byte[] b) Cast data from bytearray to integer value.
Long	bytesToLong(byte[] b) Cast data from bytearray to long value.
Map<String,Object>	bytesToMap(byte[] b) Deprecated.
Map<String,Object>	bytesToMap(byte[] b, ResourceSchema.ResourceFieldSchema fieldSchema) Cast data from bytearray to map value.
Tuple	bytesToTuple(byte[] b, ResourceSchema.ResourceFieldSchema fieldSchema) Cast data from bytearray to tuple value.

Method Detail

bytesToLong

Long bytesToLong(byte[] b)
                 throws IOException

Cast data from bytearray to long value.

Parameters:

b - bytearray to be cast.

Returns:

Long value.

Throws:

IOException - if the value cannot be cast.

bytesToFloat

Float bytesToFloat(byte[] b)
                   throws IOException

Cast data from bytearray to float value.

Parameters:

b - bytearray to be cast.

Returns:

Float value.

Throws:

IOException - if the value cannot be cast.

bytesToDouble

Double bytesToDouble(byte[] b)
                     throws IOException

Cast data from bytearray to double value.

Parameters:

b - bytearray to be cast.

Returns:

Double value.

Throws:

IOException - if the value cannot be cast.

bytesToInteger

Integer bytesToInteger(byte[] b)
                       throws IOException

Cast data from bytearray to integer value.

Parameters:

b - bytearray to be cast.

Returns:

Double value.

Throws:

IOException - if the value cannot be cast.

bytesToCharArray

String bytesToCharArray(byte[] b)
                        throws IOException

Cast data from bytearray to chararray value.

Parameters:

b - bytearray to be cast.

Returns:

String value.

Throws:

IOException - if the value cannot be cast.

bytesToMap

@Deprecated
Map<String,Object> bytesToMap(byte[] b)
                              throws IOException

Deprecated.

Cast data from bytearray to map value.

Parameters:

b - bytearray to be cast.

Returns:

Map value.

Throws:

IOException - if the value cannot be cast.

bytesToMap

Map<String,Object> bytesToMap(byte[] b,
                              ResourceSchema.ResourceFieldSchema fieldSchema)
                              throws IOException

Cast data from bytearray to map value.

Parameters:

b - bytearray to be cast.

fieldSchema - field schema for the output map

Returns:

Map value.

Throws:

IOException - if the value cannot be cast.

bytesToTuple

Tuple bytesToTuple(byte[] b,
                   ResourceSchema.ResourceFieldSchema fieldSchema)
                   throws IOException

Cast data from bytearray to tuple value.

Parameters:

b - bytearray to be cast.

fieldSchema - field schema for the output tuple

Returns:

Tuple value.

Throws:

IOException - if the value cannot be cast.

bytesToBag

DataBag bytesToBag(byte[] b,
                   ResourceSchema.ResourceFieldSchema fieldSchema)
                   throws IOException

Cast data from bytearray to bag value.

Parameters:

b - bytearray to be cast.

fieldSchema - field schema for the output bag

Returns:

Bag value.

Throws:

IOException - if the value cannot be cast.