com.google.code.proto.streamio

Class PBWireUnsignedByteMarkerHelper

java.lang.Object

com.google.code.proto.streamio.AbstractPBWireByteMarkerHelper

com.google.code.proto.streamio.PBWireUnsignedByteMarkerHelper

All Implemented Interfaces:

IPBWireByteMarkerHelper

public class PBWireUnsignedByteMarkerHelper
extends AbstractPBWireByteMarkerHelper

A utility class to help write delimiting byte markers for Google protocol buffer generated messages used with PBStreamReader. The delimeter is a byte array holding the size of the generated message that will follow. The delimiter is a unsigned byte marker that can be used by clients that can only process ASCII strings.

Author:

nichole

Constructor Summary

Constructors

Constructor and Description
PBWireUnsignedByteMarkerHelper()

Method Summary

Modifier and Type	Method and Description
int	bytesToInteger(byte[] marker) Convert the marker byte array to an integer where each item is part of byte shifted integer The byte array has been restricted to the signed portion to accommodate clients that can only process strings (ascii being 0-127).
byte[]	integerToBytesBigEndian(int value) Convert the integer into a byte array composed of byte shifted parts of the integer.

Methods inherited from class com.google.code.proto.streamio.AbstractPBWireByteMarkerHelper

createMessageDelimiter, estimateTotalContentLength, getByteMarkerSize, getDelimiterSize, getMarkerForStart

Methods inherited from class java.lang.Object

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

Constructor Detail

PBWireUnsignedByteMarkerHelper

public PBWireUnsignedByteMarkerHelper()

Method Detail

integerToBytesBigEndian

public byte[] integerToBytesBigEndian(int value)

Convert the integer into a byte array composed of byte shifted parts of the integer. The byte array has been restricted to the signed portion to accommodate clients that can only process strings (ascii being 0-127. extended ascii is 128-255 but not all clients can read that).

Specified by:

integerToBytesBigEndian in interface IPBWireByteMarkerHelper

Specified by:

integerToBytesBigEndian in class AbstractPBWireByteMarkerHelper

Parameters:

value - the integer to be represented by the returned byte array

Returns:

big endian byte array holding the value

bytesToInteger

public int bytesToInteger(byte[] marker)

Convert the marker byte array to an integer where each item is part of byte shifted integer The byte array has been restricted to the signed portion to accommodate clients that can only process strings (ascii being 0-127). The maximum value that can be returned is 2^(8*byteMarkerSize - 1) which is 2GB for a byteMarkerSize = 4.

Specified by:

bytesToInteger in interface IPBWireByteMarkerHelper

Specified by:

bytesToInteger in class AbstractPBWireByteMarkerHelper

Parameters:

marker - big endian byte array holding the value

Returns:

original value held in the marker