Package org.apache.sshd.common

Interface AttributeStore

All Superinterfaces:

AttributeRepository

All Known Subinterfaces:

SessionContext

public interface AttributeStore
extends AttributeRepository

Provides the capability to attach in-memory attributes to the entity

Author:

Apache MINA SSHD Project

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.sshd.common.AttributeRepository

AttributeRepository.AttributeKey<T>

Method Summary

Modifier and Type	Method	Description
void	clearAttributes()	Removes all currently stored user-defined attributes
default <T> T	computeAttributeIfAbsent(AttributeRepository.AttributeKey<T> key, Function<? super AttributeRepository.AttributeKey<T>,? extends T> resolver)	If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
<T> T	removeAttribute(AttributeRepository.AttributeKey<T> key)	Removes the user-defined attribute
<T> T	setAttribute(AttributeRepository.AttributeKey<T> key, T value)	Sets a user-defined attribute.

Methods inherited from interface org.apache.sshd.common.AttributeRepository

attributeKeys, getAttribute, getAttributesCount, resolveAttribute

Method Detail

computeAttributeIfAbsent

default <T> T computeAttributeIfAbsent(AttributeRepository.AttributeKey<T> key,
                                       Function<? super AttributeRepository.AttributeKey<T>,? extends T> resolver)

If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.

Type Parameters:

T - The generic attribute type

Parameters:

key - The key of the attribute; must not be null.

resolver - The (never null) mapping function to use if value not already mapped. If returns null then value is not mapped to the provided key.

Returns:

The resolved value - null if value not mapped and resolver did not return a non-null value for it

setAttribute

<T> T setAttribute(AttributeRepository.AttributeKey<T> key,
                   T value)

Sets a user-defined attribute.

Type Parameters:

T - The generic attribute type

Parameters:

key - The key of the attribute; must not be null.

value - The value of the attribute; must not be null.

Returns:

The old value of the attribute; null if it is new.

removeAttribute

<T> T removeAttribute(AttributeRepository.AttributeKey<T> key)

Removes the user-defined attribute

Type Parameters:

T - The generic attribute type

Parameters:

key - The key of the attribute; must not be null.

Returns:

The removed value; null if no previous value

clearAttributes

void clearAttributes()

Removes all currently stored user-defined attributes