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.kafka.metadata;
  
  import java.util.Comparator;
  import java.util.Optional;
  
  
  public class OptionalStringComparator implements Comparator<Optional<String>> {
      public static final OptionalStringComparator INSTANCE = new OptionalStringComparator();
  
      @Override
      public int compare(Optional<String> a, Optional<String> b) {
          if (a.isEmpty()) {
              if (b.isEmpty()) {
                  return 0;
              } else {
                  return -1;
              }
          } else if (b.isEmpty()) {
              return 1;
          }
          return a.get().compareTo(b.get());
      }
  }
  