Package com.opencloud.slee.resources.cgin.persist

Class GPBCodec<S,T extends S,M extends com.google.protobuf.Message>

java.lang.Object

GPBCodec<S,T,M>

Type Parameters:

S - the least-specific type this codec will accept when encoding

T - the type of instances this codec will build when decoding

M - the generated protobuf message class

All Implemented Interfaces:

PersistCodec<S,T,M>

public abstract class GPBCodec<S,T extends S,M extends com.google.protobuf.Message>
extends Object
implements PersistCodec<S,T,M>

The base PersistCodec implementation used by subclasses.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GPBCodec(M instance)	Subclasses use this constructor to provide a prototype message instance, indicating the message type they expect to handle.

Method Summary

Modifier and Type	Method	Description
T	fromByteArray(byte[] data)	Given an encoded representation generated by PersistCodec.toByteArray(S), decode and build an instance of T (always exactly this type, regardless of the actual type previously passed to PersistCodec.toByteArray(S))
abstract T	fromMessage(M message)	Given a protobuf message returned from PersistCodec.toMessage(S), decode and build an instance of T.
byte[]	toByteArray(S data)	Given an instance of S, encode it to a byte-array representation using the encoding rules associated with this codec.
abstract M	toMessage(S data)	Given an instance of S, encode it as a protobuf message.

Methods inherited from class java.lang.Object

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

Constructor Detail

GPBCodec

protected GPBCodec(M instance)

Subclasses use this constructor to provide a prototype message instance, indicating the message type they expect to handle. The prototype will be used to build messages when decoding from byte arrays.

Parameters:

instance - any instance of M (e.g. M.getDefaultInstance())

Method Detail

toByteArray

public final byte[] toByteArray(S data)
                         throws EncodeException

Description copied from interface: PersistCodec

Given an instance of S, encode it to a byte-array representation using the encoding rules associated with this codec.

Specified by:

toByteArray in interface PersistCodec<S,T extends S,M extends com.google.protobuf.Message>

Parameters:

data - the instance to encode

Returns:

an encoded form, or null if data was null

Throws:

EncodeException - if the data could not be encoded

fromByteArray

public final T fromByteArray(byte[] data)
                      throws DecodeException

Description copied from interface: PersistCodec

Given an encoded representation generated by PersistCodec.toByteArray(S), decode and build an instance of T (always exactly this type, regardless of the actual type previously passed to PersistCodec.toByteArray(S))

Specified by:

fromByteArray in interface PersistCodec<S,T extends S,M extends com.google.protobuf.Message>

Parameters:

data - the encoded form to decode

Returns:

a decoded instance of T, or null if data was null

Throws:

DecodeException - if the data could not be decoded

toMessage

public abstract M toMessage(S data)

Description copied from interface: PersistCodec

Given an instance of S, encode it as a protobuf message.

Specified by:

toMessage in interface PersistCodec<S,T extends S,M extends com.google.protobuf.Message>

Parameters:

data - the data object to encode

Returns:

a message instance representing the data object, or null if data was null

fromMessage

public abstract T fromMessage(M message)

Description copied from interface: PersistCodec

Given a protobuf message returned from PersistCodec.toMessage(S), decode and build an instance of T.

Specified by:

fromMessage in interface PersistCodec<S,T extends S,M extends com.google.protobuf.Message>

Parameters:

message - the message instance to decode, or null if message was null

Returns:

a decoded instance of T.