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rxjava3-observable developed by David Karnok

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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 io.reactivex.observable.*;
import io.reactivex.observable.extensions.ScalarCallable;
import io.reactivex.observable.internal.operators.ObservableScalarXMap.ScalarDisposable;

/**
 * Represents a constant scalar value.
 * @param  the value type
 */
public final class ObservableJust extends Observable implements ScalarCallable {

    private final T value;
    public ObservableJust(final T value) {
        this.value = value;
    }

    @Override
    protected void subscribeActual(Observer s) {
        ScalarDisposable sd = new ScalarDisposable(s, value);
        s.onSubscribe(sd);
        sd.run();
    }

    @Override
    public T call() {
        return value;
    }
}