Interfaces

Mateu defines a set of Java interfaces that your classes implement to plug into the framework’s rendering, routing, data-loading, and action-handling pipelines.

Page and component rendering

Interface	Description
ComponentTreeSupplier	Implement to provide a custom component tree for a route
ComponentAdapter	Render an arbitrary non-Mateu domain object and round-trip it back from state
TitleSupplier	Provides the page title dynamically
SubtitleSupplier	Provides the page subtitle dynamically
PageTitleSupplier	Provides the browser tab title dynamically

Application structure

Interface	Description
MenuSupplier	Provides the application navigation menu
Actionable	A navigable menu item or action link
Submenu	Marker interface for submenu containers
App	Marker interface for application root classes

Data loading

Interface	Description
ListingBackend	Provides paginated, searchable, filterable data for a grid
ReactiveListingBackend	Reactive (Reactor) variant of ListingBackend
DataSupplier	Provides arbitrary data to the component
CommandSupplier	Provides UI commands to execute on the client side
PostHydrationHandler	Called after the server re-hydrates component state
Hydratable	Takes full control of hydration, bypassing automatic field injection from request state
StateSupplier	Provides a custom object as the component state sent to the client, overriding the default (the ViewModel itself)

Action handling

Interface	Description
ActionHandler	Handles named actions triggered from the UI
RouteHandler	Handles navigation requests for a route
HttpRequest	Provides access to request context, parameters, and state
ActionSupplier	Provides the list of named actions exposed by a component, controlling which actions are available
ButtonsSupplier	Provides the full list of page buttons, replacing annotation-based button discovery
ToolbarSupplier	Provides the full list of toolbar items, replacing annotation-based toolbar discovery

Persistence

Interface	Description
CrudRepository	Basic CRUD operations for an entity
CrudAdapter	Full CRUD + listing adapter with separate view/editor forms

Validation

Interface	Description
ValidationSupplier	Provides cross-field validations programmatically
RuleSupplier	Provides conditional UI rules programmatically

Visibility

Interface	Description
VisibilitySupplier	Controls server-side visibility of fields, columns, buttons, and toolbar items dynamically at request time
DisabledSupplier	Controls server-side disabled state of fields, buttons, and toolbar items dynamically at request time
ReadOnlySupplier	Controls server-side read-only state of fields dynamically at request time
RequiredSupplier	Controls server-side required state of fields dynamically at request time
StyleSupplier	Provides field-level CSS styles dynamically at request time, overriding @Style
DescriptionSupplier	Provides field-level help/description text dynamically at request time, overriding @Help
LabelSupplier	Provides field-level label text dynamically at request time, overriding @Label
ColspanSupplier	Provides field-level colspan dynamically at request time, overriding @Colspan
StereotypeSupplier	Provides field-level stereotype dynamically at request time, overriding @Stereotype
OptionsSupplier	Provides the selectable options for a field dynamically at request time