content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.arrow.dataset.utils;
  
  import java.util.Map;
  
  /** The utility class for Map. */
  public class MapUtil {
    private MapUtil() {}
  
    /**
     * Convert the map to string array as JNI bridge.
     *
     * @param config config map
     * @return string array for serialization
     */
    public static String[] convertMapToStringArray(Map<String, String> config) {
      if (config.isEmpty()) {
        return null;
      }
      String[] configs = new String[config.size() * 2];
      int i = 0;
      for (Map.Entry<String, String> entry : config.entrySet()) {
        configs[i++] = entry.getKey();
        configs[i++] = entry.getValue();
      }
      return configs;
    }
  }
  