Module com.aoapps.lang

Package com.aoapps.lang.attribute

Utilities for working with various attribute scopes.

This API has four concepts:

1. Scope - The most broad concept is scope. Does not yet have a resolved context or attribute name.
2. Context - A specifically resolved context. Does not yet have an attribute name.
3. Attribute - An attribute has both context and name and is used for value access.
4. Attribute.Name - A name without any specific scope or context.

Ultimately, the goal is to get to an attribute, which means having both a fully resolved context and a name. The API supports arriving at an attribute in any order, such as scope → context → name or name → context.

Author:

AO Industries, Inc.

Interface Summary

Interface	Description
Attribute.Name.ContextFactory<C,T>	Supports attributes in extensible contexts, loaded via ServiceLoader.load(java.lang.Class) on each access to Attribute.Name.context(java.lang.Object).
Attribute.Name.ScopeFactory<C,T>	Supports scope attributes in extensible scopes, loaded via ServiceLoader.load(java.lang.Class) on each access to Attribute.Name.scope(java.lang.Class).

Class Summary

Class	Description
Attribute<C,T>	An attribute has scope, context, and name and is used for value access.
Attribute.Name<T>	A name without any specific scope or context.
Attribute.OldValue	A backup value from before attribute initialization, which must be closed to restore the old value.
Context<C>	A specifically resolved context.
Scope<C>	The most broad concept is scope.
Scope.Attribute<C,T>	Attribute: Has scope and name, still needs context.