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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.observable.internal.operators;

import java.util.concurrent.Callable;

import io.reactivex.common.Disposables;
import io.reactivex.common.exceptions.Exceptions;
import io.reactivex.common.internal.functions.ObjectHelper;
import io.reactivex.observable.*;

/**
 * Signals a Throwable returned by a Callable.
 *
 * @param  the value type
 */
public final class MaybeErrorCallable extends Maybe {

    final Callable errorSupplier;

    public MaybeErrorCallable(Callable errorSupplier) {
        this.errorSupplier = errorSupplier;
    }

    @Override
    protected void subscribeActual(MaybeObserver observer) {
        observer.onSubscribe(Disposables.disposed());
        Throwable ex;

        try {
            ex = ObjectHelper.requireNonNull(errorSupplier.call(), "Callable returned null throwable. Null values are generally not allowed in 2.x operators and sources.");
        } catch (Throwable ex1) {
            Exceptions.throwIfFatal(ex1);
            ex = ex1;
        }

        observer.onError(ex);
    }
}