gov.nist.javax.sip
Class Utils

java.lang.Object
  gov.nist.javax.sip.Utils

public class Utils

extends Object

A few utilities that are used in various places by the stack. This is used to convert byte arrays to hex strings etc. Generate tags and branch identifiers and odds and ends.

Version:

1.2 $Revision: 1.15 $ $Date: 2006/07/25 09:28:40 $

Author:

mranga

Constructor Summary

Utils()

Method Summary

static String	generateBranchId() Generate a cryptographically random identifier that can be used to generate a branch identifier.
static String	generateCallIdentifier(String address) Generate a call identifier.
static String	generateTag() Generate a tag for a FROM header or TO header.
static String	getQuotedString(String str) Put quotes around a string and return it.
static void	main(String[] args)
static String	toHexString(byte[] b) convert an array of bytes to an hexadecimal string

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

toHexString

public static String toHexString(byte[] b)

convert an array of bytes to an hexadecimal string

Parameters:

b - bytes array to convert to a hexadecimal string

Returns:

a string

getQuotedString

public static String getQuotedString(String str)

Put quotes around a string and return it.

Parameters:

str - string to be quoted

Returns:

a quoted string

generateCallIdentifier

public static String generateCallIdentifier(String address)

Generate a call identifier. This is useful when we want to generate a call identifier in advance of generating a message.

generateTag

public static String generateTag()

Generate a tag for a FROM header or TO header. Just return a random 4 digit integer (should be enough to avoid any clashes!) Tags only need to be unique within a call.

Returns:

a string that can be used as a tag parameter. synchronized: needed for access to 'rand', else risk to generate same tag twice

generateBranchId

public static String generateBranchId()

Generate a cryptographically random identifier that can be used to generate a branch identifier.

Returns:

a cryptographically random gloablly unique string that can be used as a branch identifier.

main

public static void main(String[] args)