Package org.jivesoftware.smackx.filetransfer

Class FileTransferNegotiator

java.lang.Object

org.jivesoftware.smack.Manager

org.jivesoftware.smackx.filetransfer.FileTransferNegotiator

public final class FileTransferNegotiator
extends Manager

Manages the negotiation of file transfers according to XEP-0096. If a file is being sent the remote user chooses the type of stream under which the file will be sent.

See Also:

• XEP-0096: SI File Transfer

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	IBB_ONLY	A static variable to use only offer IBB for file transfer.
static final String	SI_NAMESPACE
static final String	SI_PROFILE_FILE_TRANSFER_NAMESPACE

Method Summary

Modifier and Type	Method	Description
static FileTransferNegotiator	getInstanceFor(XMPPConnection connection)	Returns the file transfer negotiator related to a particular connection.
static String	getNextStreamID()	Returns a new, unique, stream ID to identify a file transfer.
static Collection<String>	getSupportedProtocols()	Returns a collection of the supported transfer protocols.
static boolean	isServiceEnabled(XMPPConnection connection)	Checks to see if all file transfer related services are enabled on the connection.
StreamNegotiator	negotiateOutgoingTransfer(Jid userID, String streamID, String fileName, long size, String desc, int responseTimeout)	Send a request to another user to send them a file.
StreamNegotiator	selectStreamNegotiator(FileTransferRequest request)	Selects an appropriate stream negotiator after examining the incoming file transfer request.

Methods inherited from class org.jivesoftware.smack.Manager

connection, getAuthenticatedConnectionOrThrow, schedule, schedule, scheduleBlocking

Methods inherited from class java.lang.Object

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

Field Details

SI_NAMESPACE

public static final String SI_NAMESPACE

See Also:

• Constant Field Values

SI_PROFILE_FILE_TRANSFER_NAMESPACE

public static final String SI_PROFILE_FILE_TRANSFER_NAMESPACE

See Also:

• Constant Field Values

IBB_ONLY

public static boolean IBB_ONLY

A static variable to use only offer IBB for file transfer. It is generally recommend to only set this variable to true for testing purposes as IBB is the backup file transfer method and shouldn't be used as the only transfer method in production systems.

Method Details

getInstanceFor

public static FileTransferNegotiator getInstanceFor(XMPPConnection connection)

Returns the file transfer negotiator related to a particular connection. When this class is requested on a particular connection the file transfer service is automatically enabled.

Parameters:

connection - The connection for which the transfer manager is desired

Returns:

The FileTransferNegotiator

isServiceEnabled

public static boolean isServiceEnabled(XMPPConnection connection)

Checks to see if all file transfer related services are enabled on the connection.

Parameters:

connection - The connection to check

Returns:

True if all related services are enabled, false if they are not.

getSupportedProtocols

public static Collection<String> getSupportedProtocols()

Returns a collection of the supported transfer protocols.

Returns:

Returns a collection of the supported transfer protocols.

selectStreamNegotiator

public StreamNegotiator selectStreamNegotiator(FileTransferRequest request)
                                        throws SmackException.NotConnectedException,
FileTransferException.NoStreamMethodsOfferedException,
FileTransferException.NoAcceptableTransferMechanisms,
InterruptedException

Selects an appropriate stream negotiator after examining the incoming file transfer request.

Parameters:

request - The related file transfer request.

Returns:

The file transfer object that handles the transfer

Throws:

FileTransferException.NoStreamMethodsOfferedException - If there are either no stream methods contained in the packet, or there is not an appropriate stream method.

SmackException.NotConnectedException - if the XMPP connection is not connected.

FileTransferException.NoAcceptableTransferMechanisms - if no acceptable transfer mechanisms are available

InterruptedException - if the calling thread was interrupted.

getNextStreamID

public static String getNextStreamID()

Returns a new, unique, stream ID to identify a file transfer.

Returns:

Returns a new, unique, stream ID to identify a file transfer.

negotiateOutgoingTransfer

public StreamNegotiator negotiateOutgoingTransfer(Jid userID,
 String streamID,
 String fileName,
 long size,
 String desc,
 int responseTimeout)
                                           throws XMPPException.XMPPErrorException,
SmackException.NotConnectedException,
SmackException.NoResponseException,
FileTransferException.NoAcceptableTransferMechanisms,
InterruptedException

Send a request to another user to send them a file. The other user has the option of, accepting, rejecting, or not responding to a received file transfer request.

If they accept, the stanza will contain the other user's chosen stream type to send the file across. The two choices this implementation provides to the other user for file transfer are SOCKS5 Bytestreams, which is the preferred method of transfer, and In-Band Bytestreams, which is the fallback mechanism.

The other user may choose to decline the file request if they do not desire the file, their client does not support XEP-0096, or if there are no acceptable means to transfer the file.

Finally, if the other user does not respond this method will return null after the specified timeout.

Parameters:

userID - The userID of the user to whom the file will be sent.

streamID - The unique identifier for this file transfer.

fileName - The name of this file. Preferably it should include an extension as it is used to determine what type of file it is.

size - The size, in bytes, of the file.

desc - A description of the file.

responseTimeout - The amount of time, in milliseconds, to wait for the remote user to respond. If they do not respond in time, this

Returns:

Returns the stream negotiator selected by the peer.

Throws:

XMPPException.XMPPErrorException - Thrown if there is an error negotiating the file transfer.

SmackException.NotConnectedException - if the XMPP connection is not connected.

SmackException.NoResponseException - if there was no response from the remote entity.

FileTransferException.NoAcceptableTransferMechanisms - if no acceptable transfer mechanisms are available

InterruptedException - if the calling thread was interrupted.