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The MongoDB Java Driver uber-artifact, containing 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.operation;

import com.mongodb.MongoWriteConcernException;
import com.mongodb.ServerAddress;
import com.mongodb.WriteConcernResult;
import com.mongodb.connection.AsyncConnection;
import com.mongodb.connection.Connection;
import com.mongodb.operation.CommandOperationHelper.CommandWriteTransformer;
import com.mongodb.operation.CommandOperationHelper.CommandWriteTransformerAsync;
import org.bson.BsonBoolean;
import org.bson.BsonDocument;
import org.bson.BsonInt32;

import static com.mongodb.internal.operation.WriteConcernHelper.createWriteConcernError;
import static com.mongodb.internal.operation.WriteConcernHelper.hasWriteConcernError;

final class FindAndModifyHelper {

    static  CommandWriteTransformer transformer() {
        return new CommandWriteTransformer() {
            @SuppressWarnings("unchecked")
            @Override
            public T apply(final BsonDocument result, final Connection connection) {
                return transformDocument(result, connection.getDescription().getServerAddress());
            }
        };
    }

    static  CommandWriteTransformerAsync asyncTransformer() {
        return new CommandWriteTransformerAsync() {
            @SuppressWarnings("unchecked")
            @Override
            public T apply(final BsonDocument result, final AsyncConnection connection) {
                return transformDocument(result, connection.getDescription().getServerAddress());
            }
        };
    }

    private static  T transformDocument(final BsonDocument result, final ServerAddress serverAddress) {
        if (hasWriteConcernError(result)) {
            throw new MongoWriteConcernException(createWriteConcernError(result.getDocument("writeConcernError")),
                    createWriteConcernResult(result.getDocument("lastErrorObject", new BsonDocument())), serverAddress);
        }

        if (!result.isDocument("value")) {
            return null;
        }
        return BsonDocumentWrapperHelper.toDocument(result.getDocument("value", null));
    }

    private static WriteConcernResult createWriteConcernResult(final BsonDocument result) {
        BsonBoolean updatedExisting = result.getBoolean("updatedExisting", BsonBoolean.FALSE);

        return WriteConcernResult.acknowledged(result.getNumber("n", new BsonInt32(0)).intValue(),
                                               updatedExisting.getValue(), result.get("upserted"));
    }

    private FindAndModifyHelper() {
    }
}