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A Reactive Streams implementation of the MongoDB Java driver
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/*
 * Copyright 2015 MongoDB, Inc.
 *
 * 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 com.mongodb.reactivestreams.client;

import com.mongodb.Block;
import com.mongodb.CursorType;
import com.mongodb.async.SingleResultCallback;
import org.bson.conversions.Bson;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;

import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.async.client.Observables.observe;

class FindPublisherImpl implements FindPublisher {

    private final com.mongodb.async.client.FindIterable wrapped;

    FindPublisherImpl(final com.mongodb.async.client.FindIterable wrapped) {
        this.wrapped = notNull("wrapped", wrapped);
    }

    @Override
    public Publisher first() {
        return new ObservableToPublisher(observe(new Block>(){
            @Override
            public void apply(final SingleResultCallback callback) {
                wrapped.first(callback);
            }
        }));
    }

    @Override
    public FindPublisher filter(final Bson filter) {
        wrapped.filter(filter);
        return this;
    }

    @Override
    public FindPublisher limit(final int limit) {
        wrapped.limit(limit);
        return this;
    }

    @Override
    public FindPublisher skip(final int skip) {
        wrapped.skip(skip);
        return this;
    }

    @Override
    public FindPublisher maxTime(final long maxTime, final TimeUnit timeUnit) {
        wrapped.maxTime(maxTime, timeUnit);
        return this;
    }

    @Override
    public FindPublisher maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
        wrapped.maxAwaitTime(maxAwaitTime, timeUnit);
        return this;
    }

    @Override
    public FindPublisher modifiers(final Bson modifiers) {
        wrapped.modifiers(modifiers);
        return this;
    }

    @Override
    public FindPublisher projection(final Bson projection) {
        wrapped.projection(projection);
        return this;
    }

    @Override
    public FindPublisher sort(final Bson sort) {
        wrapped.sort(sort);
        return this;
    }

    @Override
    public FindPublisher noCursorTimeout(final boolean noCursorTimeout) {
        wrapped.noCursorTimeout(noCursorTimeout);
        return this;
    }

    @Override
    public FindPublisher oplogReplay(final boolean oplogReplay) {
        wrapped.oplogReplay(oplogReplay);
        return this;
    }

    @Override
    public FindPublisher partial(final boolean partial) {
        wrapped.partial(partial);
        return this;
    }

    @Override
    public FindPublisher cursorType(final CursorType cursorType) {
        wrapped.cursorType(cursorType);
        return this;
    }

    @Override
    public void subscribe(final Subscriber s) {
        new ObservableToPublisher(observe(wrapped)).subscribe(s);
    }
}