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package it.niedermann.android.reactivelivedata;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.arch.core.util.Function;
import androidx.core.util.Consumer;
import androidx.core.util.Pair;
import androidx.core.util.Predicate;
import androidx.core.util.Supplier;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MediatorLiveData;
import androidx.lifecycle.Observer;
import androidx.lifecycle.Transformations;
import java.time.temporal.ChronoUnit;
import java.util.concurrent.ExecutorService;
import it.niedermann.android.reactivelivedata.combinator.DoubleCombinatorLiveData;
import it.niedermann.android.reactivelivedata.combinator.TripleCombinatorLiveData;
import it.niedermann.android.reactivelivedata.debounce.DebounceLiveData;
import it.niedermann.android.reactivelivedata.distinct.DistinctUntilChangedLiveData;
import it.niedermann.android.reactivelivedata.filter.FilterLiveData;
import it.niedermann.android.reactivelivedata.flatmap.FlatMapLiveData;
import it.niedermann.android.reactivelivedata.map.MapLiveData;
import it.niedermann.android.reactivelivedata.merge.MergeLiveData;
import it.niedermann.android.reactivelivedata.take.TakeLiveData;
import it.niedermann.android.reactivelivedata.tap.TapLiveData;
import kotlin.Triple;
import kotlin.jvm.functions.Function1;
/**
* @see ReactiveLiveDataBuilder
*/
public class ReactiveLiveData<T> extends MediatorLiveData<T> implements ReactiveLiveDataBuilder<T> {
public ReactiveLiveData(@Nullable LiveData<T> source) {
if (source == null) {
setValue(null);
} else {
addSource(source, this::setValue);
}
}
public ReactiveLiveData(@NonNull T value) {
setValue(value);
}
public ReactiveLiveData() {
super();
}
/**
* Observe without getting notified about the emitted values.
*/
public void observe(@NonNull LifecycleOwner owner) {
super.observe(owner, val -> {
// Nothing to do…
});
}
/**
* Observe without getting getting the emitted value.
*/
public void observe(@NonNull LifecycleOwner owner, @NonNull Runnable runnable) {
super.observe(owner, val -> runnable.run());
}
/**
* Cancel observation directly after one value has been emitted.
*/
public void observeOnce(@NonNull LifecycleOwner owner, @NonNull Observer<T> observer) {
final var internalObserver = new Observer<T>() {
@Override
public void onChanged(T result) {
removeObserver(this);
observer.onChanged(result);
}
};
observe(owner, internalObserver);
}
/**
* @see Transformations#map(LiveData, Function1)
*/
@NonNull
@Override
public <Y> ReactiveLiveData<Y> map(@NonNull Function1<T, Y> mapFunction) {
return new MapLiveData<>(this, mapFunction);
}
/**
* @see #map(Function1) but the mapFunction will be executed on the given executor
*/
public <Y> ReactiveLiveData<Y> map(@NonNull Function1<T, Y> mapFunction, @NonNull ExecutorService executor) {
return new MapLiveData<>(this, mapFunction, executor);
}
/**
* @see Transformations#switchMap(LiveData, Function1)
*/
@NonNull
@Override
public <Y> ReactiveLiveData<Y> flatMap(@NonNull Function1<T, LiveData<Y>> flatMapFunction) {
return new FlatMapLiveData<>(this, flatMapFunction);
}
@NonNull
@Override
public <Y> ReactiveLiveData<Y> flatMap(@NonNull Supplier<LiveData<Y>> switchMapSupplier) {
return new FlatMapLiveData<>(this, switchMapSupplier);
}
/**
* @see Transformations#distinctUntilChanged(LiveData)
*/
@NonNull
@Override
public ReactiveLiveData<T> distinctUntilChanged() {
return new DistinctUntilChangedLiveData<>(this);
}
@NonNull
public ReactiveLiveData<T> filter(@NonNull Predicate<T> predicate) {
return new FilterLiveData<>(this, predicate);
}
@NonNull
@Override
public ReactiveLiveData<T> filter(@NonNull Supplier<Boolean> supplier) {
return new FilterLiveData<>(this, supplier);
}
@NonNull
@Override
public ReactiveLiveData<T> tap(@NonNull Consumer<T> consumer) {
return new TapLiveData<>(this, consumer);
}
@NonNull
@Override
public ReactiveLiveData<T> tap(@NonNull Runnable runnable) {
return new TapLiveData<>(this, runnable);
}
/**
* @see #tap(Consumer) but the tap consumer will be executed on the given executor
*/
public ReactiveLiveData<T> tap(@NonNull Consumer<T> consumer, @NonNull ExecutorService executor) {
return new TapLiveData<>(this, consumer, executor);
}
public ReactiveLiveData<T> tap(@NonNull Runnable runnable, @NonNull ExecutorService executor) {
return new TapLiveData<>(this, runnable, executor);
}
@NonNull
@Override
public ReactiveLiveData<T> merge(@NonNull Supplier<LiveData<T>> secondSource) {
return new MergeLiveData<>(this, secondSource);
}
@NonNull
@Override
public ReactiveLiveData<T> take(int limit) {
return new TakeLiveData<>(this, limit);
}
@NonNull
@Override
public <Y> ReactiveLiveData<Pair<T, Y>> combineWith(@NonNull Function<T, LiveData<Y>> secondSourceFunction) {
return new DoubleCombinatorLiveData<>(this, secondSourceFunction);
}
@NonNull
@Override
public <Y> ReactiveLiveData<Pair<T, Y>> combineWith(@NonNull Supplier<LiveData<Y>> secondSourceSupplier) {
return new DoubleCombinatorLiveData<>(this, secondSourceSupplier);
}
@NonNull
@Override
public <Y, Z> ReactiveLiveData<Triple<T, Y, Z>> combineWith(@NonNull Function<T, LiveData<Y>> secondSourceFunction, @NonNull Function<T, LiveData<Z>> thirdSourceFunction) {
return new TripleCombinatorLiveData<>(this, secondSourceFunction, thirdSourceFunction);
}
@NonNull
@Override
public <Y, Z> ReactiveLiveData<Triple<T, Y, Z>> combineWith(@NonNull Function<T, LiveData<Y>> secondSourceFunction, @NonNull Supplier<LiveData<Z>> thirdSourceSupplier) {
return new TripleCombinatorLiveData<>(this, secondSourceFunction, thirdSourceSupplier);
}
@NonNull
@Override
public <Y, Z> ReactiveLiveData<Triple<T, Y, Z>> combineWith(@NonNull Supplier<LiveData<Y>> secondSourceSupplier, @NonNull Function<T, LiveData<Z>> thirdSourceFunction) {
return new TripleCombinatorLiveData<>(this, secondSourceSupplier, thirdSourceFunction);
}
@NonNull
@Override
public <Y, Z> ReactiveLiveData<Triple<T, Y, Z>> combineWith(@NonNull Supplier<LiveData<Y>> secondSourceSupplier, @NonNull Supplier<LiveData<Z>> thirdSourceSupplier) {
return new TripleCombinatorLiveData<>(this, secondSourceSupplier, thirdSourceSupplier);
}
@NonNull
@Override
public ReactiveLiveData<T> debounce(long timeout, @NonNull ChronoUnit timeUnit) {
return new DebounceLiveData<>(this, timeout, timeUnit);
}
@NonNull
@Override
public ReactiveLiveData<T> debounce(long timeout) {
return new DebounceLiveData<>(this, timeout);
}
}
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