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A Reactive Streams implementation of the MongoDB Java driver

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/*
 * Copyright 2008-present 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.internal;

import com.mongodb.internal.async.AsyncBatchCursor;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;

import java.util.List;
import java.util.function.Supplier;


/**
 * This class is not part of the public API and may be removed or changed at any time
 */
public class BatchCursor implements AutoCloseable {

    private final AsyncBatchCursor wrapped;

    public BatchCursor(final AsyncBatchCursor wrapped) {
        this.wrapped = wrapped;
    }

    public Publisher> next() {
        return next(() -> false);
    }

    public Publisher> next(final Supplier hasBeenCancelled) {
        return Mono.create(sink -> wrapped.next(
                (result, t) -> {
                    if (!hasBeenCancelled.get()) {
                        if (t != null) {
                            sink.error(t);
                        } else if (result == null) {
                            sink.success();
                        } else {
                            sink.success(result);
                        }
                    }
                }));
    }

    public void setBatchSize(final int batchSize) {
        wrapped.setBatchSize(batchSize);
    }

    public int getBatchSize() {
        return wrapped.getBatchSize();
    }

    public boolean isClosed() {
        return wrapped.isClosed();
    }

    public void close() {
        wrapped.close();
    }

}