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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 com.mongodb.internal.async.SingleResultCallback;
import com.mongodb.internal.binding.AsyncReadBinding;
import com.mongodb.internal.operation.AsyncReadOperation;

class VoidReadOperationThenCursorReadOperation implements AsyncReadOperation> {
    private final AsyncReadOperation readOperation;
    private final AsyncReadOperation> cursorReadOperation;

    VoidReadOperationThenCursorReadOperation(final AsyncReadOperation readOperation,
            final AsyncReadOperation> cursorReadOperation) {
        this.readOperation = readOperation;
        this.cursorReadOperation = cursorReadOperation;
    }

    public AsyncReadOperation getReadOperation() {
        return readOperation;
    }

    public AsyncReadOperation> getCursorReadOperation() {
        return cursorReadOperation;
    }

    @Override
    public void executeAsync(final AsyncReadBinding binding, final SingleResultCallback> callback) {
        readOperation.executeAsync(binding, (result, t) -> {
            if (t != null) {
                callback.onResult(null, t);
            } else {
                cursorReadOperation.executeAsync(binding, callback);
            }
        });
    }
}