Inheritance diagram for de.fu_berlin.inf.dpp.activities.ChecksumActivity:

Public Member Functions
	ChecksumActivity (User source, SPath path, long hash, long length, Timestamp jupiterTimestamp)
ChecksumActivity	withTimestamp (Timestamp jupiterTimestamp)
String	toString ()
void	dispatch (IActivityReceiver receiver)
int	hashCode ()
boolean	equals (Object obj)
Timestamp	getTimestamp ()
long	getLength ()
long	getHash ()
boolean	existsFile ()
Static Public Member Functions
static ChecksumActivity	missing (User source, SPath path)
Static Public Attributes
static final int	NON_EXISTING_DOC = -1
Protected Attributes
final long	hash
final long	length
final Timestamp	jupiterTimestamp

Detailed Description

A ChecksumActivity is used to communicate checksums from the host to the clients.

A ChecksumActivity always relates to a certain file (given a path) and contains the hash and length of the file.

To indicate that a file is missing on the host NON_EXISTING_DOC is used.

A ChecksumActivity also may contain a Timestamp to indicate at which point of time the checksum was created. A user can use this information to see whether the checksum can be used to check for consistency or whether the local user has already written additional text which invalidates the checksum.

Constructor & Destructor Documentation

de.fu_berlin.inf.dpp.activities.ChecksumActivity.ChecksumActivity	(	User	source,
		SPath	path,
		long	hash,
		long	length,
		Timestamp	jupiterTimestamp
	)

Constructor for ChecksumActivities. Timestamp can be null. ChecksumActivities created by the watchdog don't have access to the JupiterClients and therefore create an Activity without timestamp. Timestamps will be added later by the ConcurrentDocumentClient /-Server (by creating a new Activity with a timestamp)

Parameters:

source	The User that created this activity
path	The SPath pointing to the document
hash	The hashcode of the document
length	The length of the document
jupiterTimestamp	The current jupiterTimestamp for this document, may be `null`