Module is.codion.framework.model

Package is.codion.framework.model

Interface EntityEditor.Present

All Superinterfaces:

ObservableState, Observer<Boolean>

Enclosing interface:

EntityEditor<R extends EntityEditor<R>>

public static interface EntityEditor.Present
extends ObservableState

Indicates whether an entity is present, according to the predicate specified via predicate(). Presence answers the question "should a row for this entity currently exist in the database?" and is reactive — it re-evaluates whenever the underlying entity value changes.

For standalone editors the predicate defaults to "always present" and is freely settable. For editors registered as a detail editor via EntityEditor.DetailEditors.add(EditorLink), the predicate is supplied through EditorLink.Builder.present(Predicate) at registration time and locked thereafter — subsequent attempts to replace it via predicate() will fail.

Nested Class Summary

Nested classes/interfaces inherited from interface is.codion.common.reactive.observer.Observer

Observer.Builder<T,B extends Observer.Builder<T,B>>

Method Summary

Modifier and Type	Method	Description
Value<Predicate<Entity>>	predicate()	Controls the predicate used to evaluate presence.

Methods inherited from interface is.codion.common.reactive.state.ObservableState

is, not, observer

Methods inherited from interface is.codion.common.reactive.observer.Observer

addConsumer, addListener, addWeakConsumer, addWeakListener, removeConsumer, removeListener, removeWeakConsumer, removeWeakListener, when, when

Method Details

predicate

Value<Predicate<Entity>> predicate()

Controls the predicate used to evaluate presence.

For detail editors the predicate is set by the link builder at registration time and cannot be replaced afterwards; supply the predicate via EditorLink.Builder.present(Predicate) instead.

Returns:

a Value controlling the present predicate