com.google.code.proto.streamio
Class PBWireByteMarkerHelper

java.lang.Object
  com.google.code.proto.streamio.AbstractPBWireByteMarkerHelper
      com.google.code.proto.streamio.PBWireByteMarkerHelper

All Implemented Interfaces:

IPBWireByteMarkerHelper

public class PBWireByteMarkerHelper
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 an unsigned byte marker so can't be used by clients that can only process ASCII strings (for example, web browsers that don't support the Blob API).

Author:

nichole

Constructor Summary

PBWireByteMarkerHelper()

Method Summary

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 sz) 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

PBWireByteMarkerHelper

public PBWireByteMarkerHelper()

Method Detail

integerToBytesBigEndian

public byte[] integerToBytesBigEndian(int sz)

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).

Specified by:

integerToBytesBigEndian in interface IPBWireByteMarkerHelper

Specified by:

integerToBytesBigEndian in class AbstractPBWireByteMarkerHelper

Parameters:

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

Returns:

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 -

Returns: