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RxJavaHelpers.java
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RxJavaHelpers.java
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package org.genericsystem.defaults.tools;
import java.util.AbstractMap.SimpleEntry;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import io.reactivex.Observable;
import io.reactivex.ObservableEmitter;
import io.reactivex.ObservableOnSubscribe;
import io.reactivex.disposables.Disposables;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.ListChangeListener;
import javafx.collections.MapChangeListener;
import javafx.collections.ObservableList;
import javafx.collections.ObservableMap;
public class RxJavaHelpers {
/**
* Creates an Observable from a JavaFX ObservableValue that emits all successive non-null values
* taken by the ObservableValue.
*
* @param fxObservable the observed ObservableValue
* @param <T> the type of the observed value
* @return an Observable emitting non-null values as the wrapped ObservableValue changes.
*/
public static <T> Observable<T> valuesOf(final ObservableValue<T> fxObservable) {
return fromObservableValue(fxObservable);
}
/**
* Creates an Observable from a JavaFX ObservableValue that emits all successive values
* taken by the ObservableValue wrapped in an Optional.
*
* @param fxObservable the observed ObservableValue
* @param <T> the type of the observed value
* @return an Observable emitting Optionals wrapping the successive values of the ObservableValue.
*/
public static <T> Observable<Optional<T>> optionalValuesOf(final ObservableValue<T> fxObservable) {
return fromNullableObservableValue(fxObservable);
}
/**
* Creates an observable that emits the whole list every time it changes.
*
* @param source The source ObservableList.
* @return An Observable emitting the new list after each change.
*/
public static <T> Observable<List<T>> changesOf(final ObservableList<T> source) {
return fromObservableList(source);
}
/**
* Creates an observable that emits all additions to an ObservableList.
*
* @param source The source ObservableList for the item add events.
* @return An Observable emitting items added to the ObservableList.
*/
public static <T> Observable<T> additionsOf(final ObservableList<T> source) {
return fromObservableListAdds(source);
}
/**
* Creates an observable that emits all removals from an ObservableList.
*
* @param source The source ObservableList for the item removal events.
* @return An Observable emitting items removed from the ObservableList.
*/
public static <T> Observable<T> removalsOf(final ObservableList<T> source) {
return fromObservableListRemovals(source);
}
/**
* Creates an observable that emits all additions to an ObservableMap.
*
* @param source The source ObservableMap for the item add events.
* @return An Observable emitting Entry items added to the ObservableMap.
*/
public static <K,T> Observable<Map.Entry<K,T>> additionsOf(final ObservableMap<K,T> source) {
return fromObservableMapAdds(source);
}
/**
* Creates an observable that emits all removals from an ObservableMap.
*
* @param source The source ObservableMap for the item removal events.
* @return An Observable emitting Entry items removed from the ObservableMap.
*/
public static <K,T> Observable<Map.Entry<K,T>> removalsOf(final ObservableMap<K,T> source) {
return fromObservableMapRemovals(source);
}
private static <T> Observable<T> fromObservableValue(final ObservableValue<T> fxObservable) {
return Observable.create((ObservableEmitter<T> emitter) -> {
if (fxObservable.getValue() != null)
emitter.onNext(fxObservable.getValue());
final ChangeListener<T> listener = (observableValue, prev, current) -> {
if (current != null)
emitter.onNext(current);
};
fxObservable.addListener(listener);
emitter.setDisposable(Disposables.fromRunnable(() -> fxObservable.removeListener(listener)));
});
}
public static <T> Observable<T> prevFromObservableValue(final ObservableValue<T> fxObservable) {
return Observable.create((ObservableEmitter<T> emitter) -> {
final ChangeListener<T> listener = (observableValue, prev, current) -> {
if (prev != null)
emitter.onNext(prev);
};
fxObservable.addListener(listener);
emitter.setDisposable(Disposables.fromRunnable(() -> fxObservable.removeListener(listener)));
});
}
private static <T> Observable<Optional<T>> fromNullableObservableValue(final ObservableValue<T> fxObservable) {
return Observable.create((ObservableEmitter<Optional<T>> emitter) -> {
if (fxObservable.getValue() != null) {
emitter.onNext(Optional.of(fxObservable.getValue()));
}
final ChangeListener<T> listener = (observableValue, prev, current) -> {
emitter.onNext(Optional.ofNullable(current));
};
fxObservable.addListener(listener);
emitter.setDisposable(Disposables.fromRunnable(() -> fxObservable.removeListener(listener)));
});
}
private static <T> Observable<List<T>> fromObservableList(final ObservableList<T> source) {
return Observable.create((ObservableOnSubscribe<List<T>>) subscriber -> {
ListChangeListener<T> listener = c -> subscriber.onNext(source);
source.addListener(listener);
subscriber.setDisposable(Disposables.fromRunnable(() -> source.removeListener(listener)));
}).startWith(source);
}
private static <T> Observable<T> fromObservableListAdds(final ObservableList<T> source) {
return Observable.create((ObservableOnSubscribe<T>) subscriber -> {
ListChangeListener<T> listener = c -> {
while (c.next())
if (c.wasAdded())
c.getAddedSubList().forEach(subscriber::onNext);
};
source.addListener(listener);
subscriber.setDisposable(Disposables.fromRunnable(() -> source.removeListener(listener)));
});
}
private static <T> Observable<T> fromObservableListRemovals(final ObservableList<T> source) {
return Observable.create((ObservableOnSubscribe<T>) subscriber -> {
ListChangeListener<T> listener = c -> {
while (c.next())
if (c.wasRemoved())
c.getRemoved().forEach(subscriber::onNext);
};
source.addListener(listener);
subscriber.setDisposable(Disposables.fromRunnable(() -> source.removeListener(listener)));
});
}
private static <K,T> Observable<Entry<K,T>> fromObservableMapAdds(final ObservableMap<K,T> source) {
return Observable.create((ObservableOnSubscribe<Entry<K,T>>) subscriber -> {
MapChangeListener<K,T> listener = c -> {
if (c.wasAdded())
subscriber.onNext(new SimpleEntry<K,T>(c.getKey(),c.getValueAdded()));
};
source.addListener(listener);
subscriber.setDisposable(Disposables.fromRunnable(() -> source.removeListener(listener)));
});
}
private static <K,T> Observable<Entry<K,T>> fromObservableMapRemovals(final ObservableMap<K,T> source) {
return Observable.create((ObservableOnSubscribe<Entry<K,T>>) subscriber -> {
MapChangeListener<K,T> listener = c -> {
if (c.wasRemoved())
subscriber.onNext(new SimpleEntry<K,T>(c.getKey(),c.getValueRemoved()));
};
source.addListener(listener);
subscriber.setDisposable(Disposables.fromRunnable(() -> source.removeListener(listener)));
});
}
}