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rxjava2-extensions developed by David Karnok

There is a newer version: 0.20.10

/*
 * Copyright 2016-2018 David Karnok
 *
 * 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 hu.akarnokd.rxjava2.math;

import java.util.Comparator;

import hu.akarnokd.rxjava2.util.SelfComparator;
import io.reactivex.*;
import io.reactivex.plugins.RxJavaPlugins;

/**
 * Utility methods to work with numerical Observable sources: sum, min, max and average.
 */
public final class MathObservable {
    /** Utility class. */
    private MathObservable() {
        throw new IllegalStateException("No instances!");
    }

    public static Observable sumInt(ObservableSource source) {
        return RxJavaPlugins.onAssembly(new ObservableSumInt(source));
    }

    public static Observable sumLong(ObservableSource source) {
        return RxJavaPlugins.onAssembly(new ObservableSumLong(source));
    }

    public static Observable sumFloat(ObservableSource source) {
        return RxJavaPlugins.onAssembly(new ObservableSumFloat(source));
    }

    public static Observable sumDouble(ObservableSource source) {
        return RxJavaPlugins.onAssembly(new ObservableSumDouble(source));
    }

    public static > Observable max(ObservableSource source) {
        Comparator comp = SelfComparator.instance();
        return max(source, comp);
    }

    public static  Observable max(ObservableSource source, Comparator comparator) {
        return RxJavaPlugins.onAssembly(new ObservableMinMax(source, comparator, -1));
    }

    public static > Observable min(ObservableSource source) {
        Comparator comp = SelfComparator.instance();
        return min(source, comp);
    }

    public static  Observable min(ObservableSource source, Comparator comparator) {
        return RxJavaPlugins.onAssembly(new ObservableMinMax(source, comparator, 1));
    }

    @SuppressWarnings("unchecked")
    public static Observable averageFloat(ObservableSource source) {
        return RxJavaPlugins.onAssembly(new ObservableAverageFloat((ObservableSource)source));
    }

    @SuppressWarnings("unchecked")
    public static Observable averageDouble(ObservableSource source) {
        return RxJavaPlugins.onAssembly(new ObservableAverageDouble((ObservableSource)source));
    }

}