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The MongoDB Driver uber-artifact that combines mongodb-driver-sync and the legacy 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.client.internal;

import com.mongodb.MongoNamespace;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.client.DistinctIterable;
import com.mongodb.client.model.Collation;
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;

class DistinctIterableImpl extends MongoIterableImpl implements DistinctIterable {
    private final SyncOperations operations;

    private final Class resultClass;
    private final String fieldName;

    private Bson filter;
    private long maxTimeMS;
    private Collation collation;

    DistinctIterableImpl(@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 String fieldName, final Bson filter) {
        this(clientSession, namespace, documentClass, resultClass, codecRegistry, readPreference, readConcern, executor, fieldName,
                filter, true);
    }

    DistinctIterableImpl(@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 String fieldName, final Bson filter,
                         final boolean retryReads) {
        super(clientSession, executor, readConcern, readPreference, retryReads);
        this.operations = new SyncOperations(namespace, documentClass, readPreference, codecRegistry, retryReads);
        this.resultClass = notNull("resultClass", resultClass);
        this.fieldName = notNull("mapFunction", fieldName);
        this.filter = filter;
    }

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

    @Override
    public DistinctIterable maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

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

    @Override
    public DistinctIterable collation(@Nullable final Collation collation) {
        this.collation = collation;
        return this;
    }

    @Override
    public ReadOperation> asReadOperation() {
        return operations.distinct(fieldName, filter, resultClass, maxTimeMS, collation);
    }
}