name.remal.collections.ObservableCollection Maven / Gradle / Ivy

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package name.remal.collections;

import java.util.Collection;
import org.jetbrains.annotations.NotNull;

public interface ObservableCollection extends Collection {

    @NotNull
    HandlerRegistration registerElementAddedHandler(@NotNull ElementAddedHandler handler);

    @NotNull
    HandlerRegistration registerElementRemovedHandler(@NotNull ElementRemovedHandler handler);

    @NotNull
    default HandlerRegistration registerCollectionChangedHandler(@NotNull CollectionChangedHandler handler) {
        HandlerRegistration elementAddedHandlerRegistration = registerElementAddedHandler(__ -> handler.onCollectionChanged());
        HandlerRegistration elementRemovedHandlerRegistration = registerElementRemovedHandler(__ -> handler.onCollectionChanged());
        return () -> {
            elementAddedHandlerRegistration.deregister();
            elementRemovedHandlerRegistration.deregister();
        };
    }

}