reactive/AsyncRx.NET/System.Reactive.Async.Linq/System/Reactive/Linq/Operators/Append.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information. 

using System.Collections.Generic;
using System.Reactive.Concurrency;

namespace System.Reactive.Linq
{
    partial class AsyncObservable
    {
        public static IAsyncObservable<TSource> Append<TSource>(this IAsyncObservable<TSource> source, TSource value)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return Create<TSource>(observer => source.SubscribeSafeAsync(AsyncObserver.Append(observer, value)));
        }

        public static IAsyncObservable<TSource> Append<TSource>(this IAsyncObservable<TSource> source, TSource value, IAsyncScheduler scheduler)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));

            return Create<TSource>(observer => source.SubscribeSafeAsync(AsyncObserver.Append(observer, value, scheduler)));
        }

        public static IAsyncObservable<TSource> Append<TSource>(this IAsyncObservable<TSource> source, params TSource[] values)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (values == null)
                throw new ArgumentNullException(nameof(values));

            return Create<TSource>(async observer => await source.SubscribeSafeAsync(AsyncObserver.Append(observer, values)));
        }

        public static IAsyncObservable<TSource> Append<TSource>(this IAsyncObservable<TSource> source, IAsyncScheduler scheduler, params TSource[] values)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));
            if (values == null)
                throw new ArgumentNullException(nameof(values));

            return Create<TSource>(async observer => await source.SubscribeSafeAsync(AsyncObserver.Append(observer, scheduler, values)));
        }

        public static IAsyncObservable<TSource> Append<TSource>(this IAsyncObservable<TSource> source, IEnumerable<TSource> values)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (values == null)
                throw new ArgumentNullException(nameof(values));

            return Create<TSource>(async observer => await source.SubscribeSafeAsync(AsyncObserver.Append(observer, values)));
        }

        public static IAsyncObservable<TSource> Append<TSource>(this IAsyncObservable<TSource> source, IAsyncScheduler scheduler, IEnumerable<TSource> values)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));
            if (values == null)
                throw new ArgumentNullException(nameof(values));

            return Create<TSource>(async observer => await source.SubscribeSafeAsync(AsyncObserver.Append(observer, scheduler, values)));
        }
    }

    partial class AsyncObserver
    {
        public static IAsyncObserver<TSource> Append<TSource>(IAsyncObserver<TSource> observer, TSource value)
        {
            if (observer == null)
                throw new ArgumentNullException(nameof(observer));

            return Create<TSource>(
                observer.OnNextAsync,
                observer.OnErrorAsync,
                async () =>
                {
                    await observer.OnNextAsync(value);
                    await observer.OnCompletedAsync();
                }
            );
        }

        public static IAsyncObserver<TSource> Append<TSource>(IAsyncObserver<TSource> observer, TSource value, IAsyncScheduler scheduler)
        {
            if (observer == null)
                throw new ArgumentNullException(nameof(observer));
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));

            throw new NotImplementedException();
        }

        public static IAsyncObserver<TSource> Append<TSource>(IAsyncObserver<TSource> observer, params TSource[] values)
        {
            if (observer == null)
                throw new ArgumentNullException(nameof(observer));
            if (values == null)
                throw new ArgumentNullException(nameof(values));

            return Create<TSource>(
                observer.OnNextAsync,
                observer.OnErrorAsync,
                async () =>
                {
                    foreach (var value in values)
                    {
                        await observer.OnNextAsync(value);
                    }

                    await observer.OnCompletedAsync();
                }
            );
        }

        public static IAsyncObserver<TSource> Append<TSource>(IAsyncObserver<TSource> observer, IAsyncScheduler scheduler, params TSource[] values)
        {
            if (observer == null)
                throw new ArgumentNullException(nameof(observer));
            if (values == null)
                throw new ArgumentNullException(nameof(values));
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));

            throw new NotImplementedException();
        }

        public static IAsyncObserver<TSource> Append<TSource>(IAsyncObserver<TSource> observer, IEnumerable<TSource> values)
        {
            if (observer == null)
                throw new ArgumentNullException(nameof(observer));
            if (values == null)
                throw new ArgumentNullException(nameof(values));

            return Create<TSource>(
                observer.OnNextAsync,
                observer.OnErrorAsync,
                async () =>
                {
                    foreach (var value in values)
                    {
                        await observer.OnNextAsync(value);
                    }

                    await observer.OnCompletedAsync();
                }
            );
        }

        public static IAsyncObserver<TSource> Append<TSource>(IAsyncObserver<TSource> observer, IAsyncScheduler scheduler, IEnumerable<TSource> values)
        {
            if (observer == null)
                throw new ArgumentNullException(nameof(observer));
            if (values == null)
                throw new ArgumentNullException(nameof(values));
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));

            throw new NotImplementedException();
        }
    }
}