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The MongoDB Asynchronous Driver
There is a newer version: 3.12.14
/*
 * 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.async.client;

import com.mongodb.CursorType;
import com.mongodb.MongoNamespace;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.async.AsyncBatchCursor;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.FindOptions;
import com.mongodb.internal.operation.AsyncOperations;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.AsyncReadOperation;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;

import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;


@SuppressWarnings("deprecation")
class FindIterableImpl extends MongoIterableImpl implements FindIterable {
    private final AsyncOperations operations;
    private final Class resultClass;
    private final FindOptions findOptions;

    private Bson filter;

    FindIterableImpl(@Nullable final ClientSession clientSession, final MongoNamespace namespace, final Class documentClass,
                     final Class resultClass, final CodecRegistry codecRegistry, final ReadPreference readPreference,
                     final ReadConcern readConcern, final OperationExecutor executor, final Bson filter, final boolean retryReads) {
        super(clientSession, executor, readConcern, readPreference, retryReads);
        this.operations = new AsyncOperations(namespace, documentClass, readPreference, codecRegistry, retryReads);
        this.resultClass = notNull("resultClass", resultClass);
        this.filter = notNull("filter", filter);
        this.findOptions = new FindOptions();
    }

    @Override
    public FindIterable filter(@Nullable final Bson filter) {
        this.filter = filter;
        return this;
    }

    @Override
    public FindIterable limit(final int limit) {
        findOptions.limit(limit);
        return this;
    }

    @Override
    public FindIterable skip(final int skip) {
        findOptions.skip(skip);
        return this;
    }

    @Override
    public FindIterable maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        findOptions.maxTime(maxTime, timeUnit);
        return this;
    }

    @Override
    public FindIterable maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        findOptions.maxAwaitTime(maxAwaitTime, timeUnit);
        return this;
    }

    @Override
    public FindIterable batchSize(final int batchSize) {
        super.batchSize(batchSize);
        findOptions.batchSize(batchSize);
        return this;
    }

    @Override
    public FindIterable collation(@Nullable final Collation collation) {
        findOptions.collation(collation);
        return this;
    }

    @Override
    @SuppressWarnings("deprecation")
    public FindIterable modifiers(@Nullable final Bson modifiers) {
        findOptions.modifiers(modifiers);
        return this;
    }

    @Override
    public FindIterable projection(@Nullable final Bson projection) {
        findOptions.projection(projection);
        return this;
    }

    @Override
    public FindIterable sort(@Nullable final Bson sort) {
        findOptions.sort(sort);
        return this;
    }

    @Override
    public FindIterable noCursorTimeout(final boolean noCursorTimeout) {
        findOptions.noCursorTimeout(noCursorTimeout);
        return this;
    }

    @Override
    public FindIterable oplogReplay(final boolean oplogReplay) {
        findOptions.oplogReplay(oplogReplay);
        return this;
    }

    @Override
    public FindIterable partial(final boolean partial) {
        findOptions.partial(partial);
        return this;
    }

    @Override
    public FindIterable cursorType(final CursorType cursorType) {
        findOptions.cursorType(cursorType);
        return this;
    }

    @Override
    public FindIterable comment(@Nullable final String comment) {
        findOptions.comment(comment);
        return this;
    }

    @Override
    public FindIterable hint(@Nullable final Bson hint) {
        findOptions.hint(hint);
        return this;
    }

    @Override
    public FindIterable max(@Nullable final Bson max) {
        findOptions.max(max);
        return this;
    }

    @Override
    public FindIterable min(@Nullable final Bson min) {
        findOptions.min(min);
        return this;
    }

    @Override
    @SuppressWarnings("deprecation")
    public FindIterable maxScan(final long maxScan) {
        findOptions.maxScan(maxScan);
        return this;
    }

    @Override
    public FindIterable returnKey(final boolean returnKey) {
        findOptions.returnKey(returnKey);
        return this;
    }

    @Override
    public FindIterable showRecordId(final boolean showRecordId) {
        findOptions.showRecordId(showRecordId);
        return this;
    }

    @Override
    @SuppressWarnings("deprecation")
    public FindIterable snapshot(final boolean snapshot) {
        findOptions.snapshot(snapshot);
        return this;
    }

    @Override
    public void first(final SingleResultCallback callback) {
        notNull("callback", callback);
        getExecutor().execute(operations.findFirst(filter, resultClass, findOptions), getReadPreference(), getReadConcern(),
                getClientSession(), new SingleResultCallback>() {
                    @Override
                    public void onResult(final AsyncBatchCursor batchCursor, final Throwable t) {
                        if (t != null) {
                            callback.onResult(null, t);
                        } else {
                            batchCursor.next(new SingleResultCallback>() {
                                @Override
                                public void onResult(final List result, final Throwable t) {
                                    batchCursor.close();
                                    if (t != null) {
                                        callback.onResult(null, t);
                                    } else if (result == null || result.isEmpty()) {
                                        callback.onResult(null, null);
                                    } else {
                                        callback.onResult(result.get(0), null);
                                    }
                                }
                            });
                        }
                    }
                });
    }

    @Override
    AsyncReadOperation> asAsyncReadOperation() {
        return createFindOperation();
    }

    private AsyncReadOperation> createFindOperation() {
        return operations.find(filter, resultClass, findOptions);
    }
}