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The official MongoDB Apache Kafka Connect Connector.

There is a newer version: 1.13.1

/*
 * 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.kafka.connect.util;

import java.util.Optional;

import org.bson.BsonDocument;
import org.bson.BsonValue;

public final class BsonDocumentFieldLookup {

  public static Optional fieldLookup(
      final String fieldPath, final BsonDocument document) {
    if (document.containsKey(fieldPath)) {
      return Optional.of(document.get(fieldPath));
    } else if (fieldPath.contains(".") && !fieldPath.endsWith(".")) {
      String subDocumentName = fieldPath.substring(0, fieldPath.indexOf("."));
      String subDocumentFieldName = fieldPath.substring(fieldPath.indexOf(".") + 1);
      if (document.isDocument(subDocumentName)) {
        return fieldLookup(subDocumentFieldName, document.getDocument(subDocumentName));
      }
    }

    return Optional.empty();
  }

  private BsonDocumentFieldLookup() {}
}