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/**
 * Copyright (c) 2016-present, RxJava 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 io.reactivex.internal.operators.observable;

import io.reactivex.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.plugins.RxJavaPlugins;

/**
 * Allows lifting operators into a chain of Observables.
 *
 * 

By having a concrete ObservableSource as lift, operator fusing can now identify * both the source and the operation inside it via casting, unlike the lambda version of this. * * @param the upstream value type * @param the downstream parameter type */ public final class ObservableLift extends AbstractObservableWithUpstream { /** The actual operator. */ final ObservableOperator operator; public ObservableLift(ObservableSource source, ObservableOperator operator) { super(source); this.operator = operator; } @Override public void subscribeActual(Observer observer) { Observer liftedObserver; try { liftedObserver = ObjectHelper.requireNonNull(operator.apply(observer), "Operator " + operator + " returned a null Observer"); } catch (NullPointerException e) { // NOPMD throw e; } catch (Throwable e) { Exceptions.throwIfFatal(e); // can't call onError because no way to know if a Disposable has been set or not // can't call onSubscribe because the call might have set a Disposable already RxJavaPlugins.onError(e); NullPointerException npe = new NullPointerException("Actually not, but can't throw other exceptions due to RS"); npe.initCause(e); throw npe; } source.subscribe(liftedObserver); } }





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