Package org.patternfly.core

package org.patternfly.core

Core classes and interfaces for PatternFly Java.

This package provides the foundational building blocks used throughout PatternFly Java components and layouts. It includes utilities for ARIA attributes, data attributes, component context management, observable values, and common types.

Key Classes and Interfaces

ARIA and Data Attributes

• Aria - Constants for ARIA attribute names (aria-label, aria-expanded, etc.)
• Attributes - Common HTML attribute constants
• Dataset - Constants for data-* attribute names used in PatternFly components
• Roles - Constants for ARIA role attribute values
• Ouia - Open UI Automation (OUIA) data attribute utilities for testing
• OuiaSupport - Mixin interface for custom components to participate in OUIA

Component Infrastructure

• ComponentContext - Interface for storing and retrieving arbitrary values within a component
• ObservableValue - A value wrapper that notifies subscribers when changed, enabling reactive patterns
• AsyncStatus - Enumeration representing asynchronous operation states

Utilities

• Tuple and Tuples - Simple key-value pair types
• Numbers - Numeric utility functions
• Timeouts - Common timeout constants
• Validation - Validation helpers for property ranges and enums
• LanguageDirection - Language direction enumeration (LTR/RTL)
• Version - Version information for the PatternFly Java library

Integration with Elemento

PatternFly Java builds upon Elemento's builder API, providing a fluent, type-safe approach to creating web components. The ComponentContext interface extends Elemento's TypedBuilder to provide consistent builder patterns across all PatternFly components.

Observable Values

The ObservableValue class enables reactive programming patterns by allowing components to subscribe to value changes. Example usage:

ObservableValue<String> value = ObservableValue.ov("initial");
value.subscribe((current, previous) -> console.log("Value changed: " + current));
value.set("new value"); // Triggers subscriber notification

See Also:

• PatternFly Design System
• PatternFly Java Documentation
• Elemento Builder API

Class	Description
Aria	Provides constants for common ARIA attribute names used across PatternFly components.
AsyncStatus	Defines the status of an asynchronous operation.
Attributes	Provides constants for common HTML attribute names used across PatternFly components.
ComponentContext<E extends Element, B extends TypedBuilder<E,B>>	The ComponentContext interface represents a context for a component, providing methods to store and retrieve arbitrary values associated with keys.
Dataset	Provides constants for data-* attribute names used across PatternFly components.
LanguageDirection	Represents the text direction (left-to-right or right-to-left) of an element.
Numbers	Utility methods for numeric calculations such as percentage computation.
ObservableValue<T>	Inspired by FrontendMasters/obervablish-values.
ObservableValue.Subscriber<T>
Ouia	Support for Open UI Automation.
OuiaSupport<E extends HTMLElement, B extends TypedBuilder<E,B>>	Interface for components that support Open UI Automation.
Roles	Provides constants for WAI-ARIA role attribute values used across PatternFly components.
Timeouts	Provides timeout constants (in milliseconds) used across PatternFly components.
Tuple<K,V>	An immutable key-value pair.
Tuples<K,V>	An ordered collection of Tuple instances with lookup by key or value.
Validation	Utility methods for validating property values such as numeric ranges and enum memberships.
Version