public void writeMessageSetExtension ( final int fieldNumber , final MessageLite value ) throws IOException { writeTag ( WireFormat . MESSAGE_SET_ITEM , WireFormat . WIRETYPE_START_GROUP ) ; writeUInt32 ( WireFormat . MESSAGE_SET_TYPE_ID , fieldNumber ) ; writeMessage ( WireFormat . MESSAGE_SET_MESSAGE , value ) ; writeTag ( WireFormat . MESSAGE_SET_ITEM , WireFormat . WIRETYPE_END_GROUP ) ; }
Write a MessageSet extension field to the stream . For historical reasons the wire format differs from normal fields .