javax.mail.internet

Class UniqueValue

java.lang.Object

javax.mail.internet.UniqueValue

class UniqueValue
extends java.lang.Object

This is a utility class that generates unique values. The generated String contains only US-ASCII characters and hence is safe for use in RFC822 headers.

This is a package private class.

Field Summary

Fields

Modifier and Type	Field and Description
private static int	id A global unique number, to ensure uniqueness of generated strings.

Constructor Summary

Constructors

Constructor and Description
UniqueValue()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	getUniqueBoundaryValue() Get a unique value for use in a multipart boundary string.
private static int	getUniqueId() Ensure ID is unique by synchronizing access.
static java.lang.String	getUniqueMessageIDValue(Session ssn) Get a unique value for use in a Message-ID.

Methods inherited from class java.lang.Object

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

Field Detail

id

private static int id

A global unique number, to ensure uniqueness of generated strings.

Constructor Detail

UniqueValue

UniqueValue()

Method Detail

getUniqueBoundaryValue

public static java.lang.String getUniqueBoundaryValue()

Get a unique value for use in a multipart boundary string. This implementation generates it by concatenating a global part number, a newly created object's hashCode(), and the current time (in milliseconds).

getUniqueMessageIDValue

public static java.lang.String getUniqueMessageIDValue(Session ssn)

Get a unique value for use in a Message-ID. This implementation generates it by concatenating a newly created object's hashCode(), a global ID (incremented on every use), the current time (in milliseconds), the string "JavaMail", and this user's local address generated by InternetAddress.getLocalAddress(). (The address defaults to "javamailuser@localhost" if getLocalAddress() returns null.)

Parameters:

ssn - Session object used to get the local address

See Also:

InternetAddress

getUniqueId

private static int getUniqueId()

Ensure ID is unique by synchronizing access. XXX - Could use AtomicInteger.getAndIncrement() in J2SE 5.0.