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.server.config;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.concurrent.TimeUnit;
  import java.util.function.Function;
  
  
  /**
   * Represents a synonym for a configuration plus a conversion function. The conversion
   * function is necessary for cases where the synonym is denominated in different units
   * (hours versus milliseconds, etc.)
   */
  public class ConfigSynonym {
      private static final Logger log = LoggerFactory.getLogger(ConfigSynonym.class);
  
      public static final Function<String, String> HOURS_TO_MILLISECONDS = input -> {
          int hours = valueToInt(input, 0, "hoursToMilliseconds");
          return String.valueOf(TimeUnit.MILLISECONDS.convert(hours, TimeUnit.HOURS));
      };
  
      public static final Function<String, String> MINUTES_TO_MILLISECONDS = input -> {
          int hours = valueToInt(input, 0, "minutesToMilliseconds");
          return String.valueOf(TimeUnit.MILLISECONDS.convert(hours, TimeUnit.MINUTES));
      };
  
      private static int valueToInt(String input, int defaultValue, String what) {
          if (input == null) return defaultValue;
          String trimmedInput = input.trim();
          if (trimmedInput.isEmpty()) {
              return defaultValue;
          }
          try {
              return Integer.parseInt(trimmedInput);
          } catch (Exception e) {
              log.error("{} failed: unable to parse '{}' as an integer.", what, trimmedInput, e);
              return defaultValue;
          }
      }
  
      private final String name;
      private final Function<String, String> converter;
  
      public ConfigSynonym(String name, Function<String, String> converter) {
          this.name = name;
          this.converter = converter;
      }
  
      public ConfigSynonym(String name) {
          this(name, Function.identity());
      }
  
      public String name() {
          return name;
      }
  
      public Function<String, String> converter() {
          return converter;
      }
  }
  