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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.gridfs;

import com.mongodb.client.gridfs.model.GridFSFile;
import com.mongodb.client.model.Collation;
import com.mongodb.lang.Nullable;
import org.bson.conversions.Bson;
import org.reactivestreams.Publisher;

import java.util.concurrent.TimeUnit;

/**
 * Iterable for the GridFS Files Collection.
 *
 * @since 1.3
 */
public interface GridFSFindPublisher extends Publisher {

    /**
     * Helper to return a publisher limited first from the query.
     *
     * @return a publisher with a single element
     */
    Publisher first();

    /**
     * Sets the query filter to apply to the query.
     * 
     * Below is an example of filtering against the filename and some nested metadata that can also be stored along with the file data:
     * 
     *  {@code
     *      Filters.and(Filters.eq("filename", "mongodb.png"), Filters.eq("metadata.contentType", "image/png"));
     *  }
     *  
     *
     * @param filter the filter, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/db.collection.find/ Filter
     * @see com.mongodb.client.model.Filters
     */
    GridFSFindPublisher filter(@Nullable Bson filter);

    /**
     * Sets the limit to apply.
     *
     * @param limit the limit, which may be null
     * @return this
     * @mongodb.driver.manual reference/method/cursor.limit/#cursor.limit Limit
     */
    GridFSFindPublisher limit(int limit);

    /**
     * Sets the number of documents to skip.
     *
     * @param skip the number of documents to skip
     * @return this
     * @mongodb.driver.manual reference/method/cursor.skip/#cursor.skip Skip
     */
    GridFSFindPublisher skip(int skip);

    /**
     * Sets the sort criteria to apply to the query.
     *
     * @param sort the sort criteria, which may be null.
     * @return this
     * @mongodb.driver.manual reference/method/cursor.sort/ Sort
     */
    GridFSFindPublisher sort(@Nullable Bson sort);

    /**
     * The server normally times out idle cursors after an inactivity period (10 minutes)
     * to prevent excess memory use. Set this option to prevent that.
     *
     * @param noCursorTimeout true if cursor timeout is disabled
     * @return this
     */
    GridFSFindPublisher noCursorTimeout(boolean noCursorTimeout);

    /**
     * Sets the maximum execution time on the server for this operation.
     *
     * @param maxTime  the max time
     * @param timeUnit the time unit, which may not be null
     * @return this
     * @mongodb.driver.manual reference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
     */
    GridFSFindPublisher maxTime(long maxTime, TimeUnit timeUnit);

    /**
     * Sets the collation options
     *
     * A null value represents the server default.
     * @param collation the collation options to use
     * @return this
     * @since 1.3
     * @mongodb.server.release 3.4
     */
    GridFSFindPublisher collation(@Nullable Collation collation);

    /**
     * Sets the number of documents to return per batch.
     *
     * Overrides the {@link org.reactivestreams.Subscription#request(long)} value for setting the batch size, allowing for fine-grained
     * control over the underlying cursor.
     *
     * @param batchSize the batch size
     * @return this
     * @since 1.8
     * @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
     */
    GridFSFindPublisher batchSize(int batchSize);
}