/*

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

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.nio.ByteBuffer;

import java.nio.MappedByteBuffer;

import java.util.Collection;

import java.util.List;

import java.util.concurrent.Flow;

import java.util.function.Function;

import java.net.http.HttpResponse.BodyHandler;

import java.net.http.HttpResponse.BodySubscriber;

/*

 * @test

 * @summary Basic test for Flow adapters with generic type parameters

 * @compile FlowAdaptersCompileOnly.java

 */

public class FlowAdaptersCompileOnly {

    static void makesSureDifferentGenericSignaturesCompile() {

    }

    static class BBPublisher implements Flow.Publisher<ByteBuffer> {

        @Override

        public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) { }

    }

    static class MBBPublisher implements Flow.Publisher<MappedByteBuffer> {

        @Override

        public void subscribe(Flow.Subscriber<? super MappedByteBuffer> subscriber) { }

    }

    static class ListSubscriber 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() { }

    }

    static class CollectionSubscriber implements Flow.Subscriber<Collection<ByteBuffer>> {

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

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

        @Override public void onError(Throwable throwable) { }

        @Override public void onComplete() { }

    }

    static class IterableSubscriber implements Flow.Subscriber<Iterable<ByteBuffer>> {

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

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

        @Override public void onError(Throwable throwable) { }

        @Override public void onComplete() { }

    }

    static class ObjectSubscriber implements Flow.Subscriber<Object> {

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

        @Override public void onNext(Object item) { }

        @Override public void onError(Throwable throwable) { }

        @Override public void onComplete() { }

    }

    // ---

    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() {

    }

    // ---

    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();

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

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

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

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

    }

}