code: /*
   * Copyright (c) 2022 Airbyte, Inc., all rights reserved.
   */
  
  package io.airbyte.integrations.destination.mongodb;
  
  import com.google.common.annotations.VisibleForTesting;
  import io.airbyte.integrations.destination.ExtendedNameTransformer;
  
  @VisibleForTesting
  public class MongodbNameTransformer extends ExtendedNameTransformer {
  
    @Override
    public String applyDefaultCase(final String input) {
      return input.toLowerCase();
    }
  
    @Override
    public String convertStreamName(final String input) {
      String result = super.convertStreamName(input);
      if (!result.isEmpty() && result.charAt(0) == '_') {
        result = result.substring(1);
      }
      return maxStringLength(result, 64);
    }
  
    /* Helpers */
  
    private String maxStringLength(final String value, final Integer length) {
      if (value.length() <= length) {
        return value;
      }
      return value.substring(0, length);
    }
  
  }
  