org.immutables.criteria.repository.rxjava2.RxJavaUpdaterDelegate Maven / Gradle / Ivy

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RxJava implementation for Repository (readers / writers)

There is a newer version: 2.10.1

/*
 * Copyright 2019 Immutables Authors and Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.immutables.criteria.repository.rxjava2;

import io.reactivex.Flowable;
import io.reactivex.Single;
import org.immutables.criteria.backend.WriteResult;
import org.immutables.criteria.matcher.Projection;
import org.immutables.criteria.repository.Updater;
import org.immutables.criteria.repository.reactive.ReactiveUpdater;
import org.reactivestreams.Publisher;

import java.util.Objects;

class RxJavaUpdaterDelegate implements Updater> {

  private final ReactiveUpdater delegate;

  RxJavaUpdaterDelegate(ReactiveUpdater delegate) {
    this.delegate = Objects.requireNonNull(delegate, "delegate");
  }

  @Override
  public  Setter> set(Projection projection, V value) {
    return new RxJavaSetter<>(delegate.set(projection, value));
  }

  @Override
  public WriteExecutor> replace(T newValue) {
    return () -> Flowable.fromPublisher(delegate.replace(newValue).execute()).singleOrError();
  }

  @SuppressWarnings("unchecked")
  private static class RxJavaSetter implements Updater.Setter> {

    private final ReactiveUpdater.ReactiveSetter delegate;

    private RxJavaSetter(ReactiveUpdater.ReactiveSetter delegate) {
      this.delegate = delegate;
    }

    @Override
    public  RxJavaSetter set(Projection projection, V value) {
      return new RxJavaSetter<>(delegate.set(projection, value));
    }

    @Override
    public Single execute() {
      Publisher execute = delegate.execute();
      return Flowable.fromPublisher(execute).singleOrError();
    }
  }
}