Package org.apache.sshd.client.subsystem.sftp

Interface SftpVersionSelector

All Known Implementing Classes:

SftpVersionSelector.NamedVersionSelector

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface SftpVersionSelector

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	SftpVersionSelector.NamedVersionSelector

Field Summary

Fields

Modifier and Type	Field	Description
static SftpVersionSelector	CURRENT	An SftpVersionSelector that returns the current version
static SftpVersionSelector	MAXIMUM	An SftpVersionSelector that returns the maximum available version
static SftpVersionSelector	MINIMUM	An SftpVersionSelector that returns the maximum available version

Method Summary

Modifier and Type	Method	Description
static SftpVersionSelector	fixedVersionSelector(int version)	Creates a selector the always returns the requested (fixed version) regardless of what the current or reported available versions are.
static SftpVersionSelector	preferredVersionSelector(int... preferred)	Selects a version in order of preference - if none of the preferred versions is listed as available then an exception is thrown when the selectVersion(ClientSession, int, List) method is invoked
static SftpVersionSelector	preferredVersionSelector(java.lang.Iterable<? extends java.lang.Number> preferred)	Selects a version in order of preference - if none of the preferred versions is listed as available then an exception is thrown when the selectVersion(ClientSession, int, List) method is invoked
int	selectVersion(ClientSession session, int current, java.util.List<java.lang.Integer> available)

Field Detail

CURRENT

static final SftpVersionSelector CURRENT

An SftpVersionSelector that returns the current version

MAXIMUM

static final SftpVersionSelector MAXIMUM

An SftpVersionSelector that returns the maximum available version

MINIMUM

static final SftpVersionSelector MINIMUM

An SftpVersionSelector that returns the maximum available version

Method Detail

selectVersion

int selectVersion(ClientSession session,
                  int current,
                  java.util.List<java.lang.Integer> available)

Parameters:

session - The ClientSession through which the SFTP connection is made

current - The current version negotiated with the server

available - Extra versions available - may be empty and/or contain only the current one

Returns:

The new requested version - if same as current, then nothing is done

fixedVersionSelector

static SftpVersionSelector fixedVersionSelector(int version)

Creates a selector the always returns the requested (fixed version) regardless of what the current or reported available versions are. If the requested version is not reported as available then an exception will be eventually thrown by the client during re-negotiation phase.

Parameters:

version - The requested version

Returns:

The SftpVersionSelector

preferredVersionSelector

static SftpVersionSelector preferredVersionSelector(int... preferred)

Selects a version in order of preference - if none of the preferred versions is listed as available then an exception is thrown when the selectVersion(ClientSession, int, List) method is invoked

Parameters:

preferred - The preferred versions in decreasing order of preference (i.e., most preferred is 1st) - may not be null/empty

Returns:

A SftpVersionSelector that attempts to select the most preferred version that is also listed as available.

preferredVersionSelector

static SftpVersionSelector preferredVersionSelector(java.lang.Iterable<? extends java.lang.Number> preferred)

Selects a version in order of preference - if none of the preferred versions is listed as available then an exception is thrown when the selectVersion(ClientSession, int, List) method is invoked

Parameters:

preferred - The preferred versions in decreasing order of preference (i.e., most preferred is 1st)

Returns:

A SftpVersionSelector that attempts to select the most preferred version that is also listed as available.