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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.
 *
 * Original Work: Apache License, Version 2.0, Copyright 2017 Hans-Peter Grahsl.
 */

package com.mongodb.kafka.connect.sink.processor;

import static com.mongodb.kafka.connect.sink.MongoSinkTopicConfig.DOCUMENT_ID_STRATEGY_OVERWRITE_EXISTING_CONFIG;
import static com.mongodb.kafka.connect.sink.MongoSinkTopicConfig.ID_FIELD;

import org.apache.kafka.connect.sink.SinkRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.bson.BsonDocument;

import com.mongodb.kafka.connect.sink.MongoSinkTopicConfig;
import com.mongodb.kafka.connect.sink.converter.SinkDocument;
import com.mongodb.kafka.connect.sink.processor.id.strategy.IdStrategy;

public class DocumentIdAdder extends PostProcessor {
  private static final Logger LOGGER = LoggerFactory.getLogger(DocumentIdAdder.class);
  private final IdStrategy idStrategy;
  private final boolean overwriteExistingIdValues;

  public DocumentIdAdder(final MongoSinkTopicConfig config) {
    super(config);
    this.idStrategy = config.getIdStrategy();
    this.overwriteExistingIdValues =
        config.getBoolean(DOCUMENT_ID_STRATEGY_OVERWRITE_EXISTING_CONFIG);
  }

  @Override
  public void process(final SinkDocument doc, final SinkRecord orig) {
    doc.getValueDoc()
        .ifPresent(
            vd -> {
              if (shouldAppend(vd)) {
                vd.append(ID_FIELD, idStrategy.generateId(doc, orig));
              } else if (vd.containsKey(ID_FIELD)) {
                LOGGER.warn(
                    "Cannot overwrite the existing '{}' value. '{}' is set to false and the document.",
                    ID_FIELD,
                    DOCUMENT_ID_STRATEGY_OVERWRITE_EXISTING_CONFIG);
              }
            });
  }

  /**
   * @param doc the value doc
   * @return true if the doc doesn't already contain the _id field or its configured to overwrite
   *     existing _id values.
   */
  private boolean shouldAppend(final BsonDocument doc) {
    return !doc.containsKey(ID_FIELD) || overwriteExistingIdValues;
  }
}