* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse.BodyHandler;

import java.net.http.HttpResponse.BodyHandlers;

import java.net.http.HttpResponse.BodySubscriber;

import java.net.http.HttpResponse.BodySubscribers;

        BodyPublishers.fromPublisher(new BBPublisher());

        BodyPublishers.fromPublisher(new MBBPublisher());

        BodyHandlers.fromSubscriber(new ListSubscriber());

        BodyHandlers.fromSubscriber(new CollectionSubscriber());

        BodyHandlers.fromSubscriber(new IterableSubscriber());

        BodyHandlers.fromSubscriber(new ObjectSubscriber());

        BodySubscribers.fromSubscriber(new ListSubscriber());

        BodySubscribers.fromSubscriber(new CollectionSubscriber());

        BodySubscribers.fromSubscriber(new IterableSubscriber());

        BodySubscribers.fromSubscriber(new ObjectSubscriber());

        BodyPublishers.fromPublisher(new BBPublisher(), 1);

        BodyPublishers.fromPublisher(new MBBPublisher(), 1);

        BodyHandlers.fromSubscriber(new ListSubscriber(), Function.identity());

        BodyHandlers.fromSubscriber(new CollectionSubscriber(), Function.identity());

        BodyHandlers.fromSubscriber(new IterableSubscriber(), Function.identity());

        BodyHandlers.fromSubscriber(new ObjectSubscriber(), Function.identity());

        BodySubscribers.fromSubscriber(new ListSubscriber(), Function.identity());

        BodySubscribers.fromSubscriber(new CollectionSubscriber(), Function.identity());

        BodySubscribers.fromSubscriber(new IterableSubscriber(), Function.identity());

        BodySubscribers.fromSubscriber(new ObjectSubscriber(), Function.identity());

    // ---

    static final Function<ListSubscriber,Integer> f1 = subscriber -> 1;

    static final Function<ListSubscriber,Number> f2 = subscriber -> 2;

    static final Function<ListSubscriberX,Integer> f3 = subscriber -> 3;

    static final Function<ListSubscriberX,Number> f4 = subscriber -> 4;

    static class ListSubscriberX extends ListSubscriber {

        int getIntegerX() { return 5; }

    }

    static void makesSureDifferentGenericFunctionSignaturesCompile() {

        BodyHandler<Integer> bh01 = BodyHandlers.fromSubscriber(new ListSubscriber(), s -> 6);

        BodyHandler<Number>  bh02 = BodyHandlers.fromSubscriber(new ListSubscriber(), s -> 7);

        BodyHandler<Integer> bh03 = BodyHandlers.fromSubscriber(new ListSubscriber(), f1);

        BodyHandler<Number>  bh04 = BodyHandlers.fromSubscriber(new ListSubscriber(), f1);

        BodyHandler<Number>  bh05 = BodyHandlers.fromSubscriber(new ListSubscriber(), f2);

        BodyHandler<Integer> bh06 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f1);

        BodyHandler<Number>  bh07 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f1);

        BodyHandler<Number>  bh08 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f2);

        BodyHandler<Integer> bh09 = BodyHandlers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX);

        BodyHandler<Number>  bh10 = BodyHandlers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX);

        BodyHandler<Integer> bh11 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f3);

        BodyHandler<Number>  bh12 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f3);

        BodyHandler<Number>  bh13 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f4);

        BodySubscriber<Integer> bs01 = BodySubscribers.fromSubscriber(new ListSubscriber(), s -> 6);

        BodySubscriber<Number>  bs02 = BodySubscribers.fromSubscriber(new ListSubscriber(), s -> 7);

        BodySubscriber<Integer> bs03 = BodySubscribers.fromSubscriber(new ListSubscriber(), f1);

        BodySubscriber<Number>  bs04 = BodySubscribers.fromSubscriber(new ListSubscriber(), f1);

        BodySubscriber<Number>  bs05 = BodySubscribers.fromSubscriber(new ListSubscriber(), f2);

        BodySubscriber<Integer> bs06 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f1);

        BodySubscriber<Number>  bs07 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f1);

        BodySubscriber<Number>  bs08 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f2);

        BodySubscriber<Integer> bs09 = BodySubscribers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX);

        BodySubscriber<Number>  bs10 = BodySubscribers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX);

        BodySubscriber<Integer> bs11 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f3);

        BodySubscriber<Number>  bs12 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f3);

        BodySubscriber<Number>  bs13 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f4);

    }

    // ---

    static class NumberSubscriber implements Flow.Subscriber<List<ByteBuffer>> {

        @Override public void onSubscribe(Flow.Subscription subscription) { }

        @Override public void onNext(List<ByteBuffer> item) { }

        @Override public void onError(Throwable throwable) { }

        @Override public void onComplete() { }

        public Number getNumber() { return null; }

    }

    static class IntegerSubscriber extends NumberSubscriber {

        @Override public void onSubscribe(Flow.Subscription subscription) { }

        @Override public void onNext(List<ByteBuffer> item) { }

        @Override public void onError(Throwable throwable) { }

        @Override public void onComplete() { }

        public Integer getInteger() { return null; }

    }

    static class LongSubscriber extends NumberSubscriber {

        @Override public void onSubscribe(Flow.Subscription subscription) { }

        @Override public void onNext(List<ByteBuffer> item) { }

        @Override public void onError(Throwable throwable) { }

        @Override public void onComplete() { }

        public Long getLong() { return null; }

    }

    static final Function<NumberSubscriber,Number> numMapper = sub -> sub.getNumber();

    static final Function<IntegerSubscriber,Integer> intMapper = sub -> sub.getInteger();

    static final Function<LongSubscriber,Long> longMapper = sub -> sub.getLong();

    public void makesSureDifferentGenericSubscriberSignaturesCompile()

        throws Exception

    {

        HttpClient client = null;

        HttpRequest request = null;

        IntegerSubscriber sub1 = new IntegerSubscriber();

        HttpResponse<Integer> r1 = client.send(request, BodyHandlers.fromSubscriber(sub1, IntegerSubscriber::getInteger));

        HttpResponse<Number>  r2 = client.send(request, BodyHandlers.fromSubscriber(sub1, IntegerSubscriber::getInteger));

        HttpResponse<Number>  r3 = client.send(request, BodyHandlers.fromSubscriber(sub1, NumberSubscriber::getNumber));

        HttpResponse<Integer> r4 = client.send(request, BodyHandlers.fromSubscriber(sub1, intMapper));

        HttpResponse<Number>  r5 = client.send(request, BodyHandlers.fromSubscriber(sub1, intMapper));

        HttpResponse<Number>  r6 = client.send(request, BodyHandlers.fromSubscriber(sub1, numMapper));

        // compiles but makes little sense. Just what you get with any usage of `? super`

        final Function<Object,Number> objectMapper = sub -> 1;

        client.sendAsync(request, BodyHandlers.fromSubscriber(sub1, objectMapper));

        // does not compile, as expected ( uncomment to see )

        //HttpResponse<Number> r7 = client.send(request, BodyHandler.fromSubscriber(sub1, longMapper));

    }