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The MongoDB Java Driver uber-artifact, containing the legacy driver, the mongodb-driver, mongodb-driver-core, and bson
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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.client.internal;

import com.mongodb.CursorType;
import com.mongodb.MongoNamespace;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.client.FindIterable;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.FindOptions;
import com.mongodb.internal.operation.SyncOperations;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.BatchCursor;
import com.mongodb.operation.ReadOperation;
import com.mongodb.client.ClientSession;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;

import java.util.concurrent.TimeUnit;

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

@SuppressWarnings("deprecation")
final class FindIterableImpl extends MongoIterableImpl implements FindIterable {

    private final SyncOperations 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) {
        super(clientSession, executor, readConcern, readPreference);
        this.operations = new SyncOperations(namespace, documentClass, readPreference, codecRegistry);
        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
    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
    @Deprecated
    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
    @Deprecated
    public FindIterable snapshot(final boolean snapshot) {
        findOptions.snapshot(snapshot);
        return this;
    }

    @Nullable
    @Override
    public TResult first() {
        BatchCursor batchCursor = getExecutor().execute(operations.findFirst(filter, resultClass, findOptions),
                getReadPreference(), getReadConcern(), getClientSession());
        try {
            return batchCursor.hasNext() ? batchCursor.next().iterator().next() : null;
        } finally {
            batchCursor.close();
        }
    }

    public ReadOperation> asReadOperation() {
        return operations.find(filter, resultClass, findOptions);
    }
}