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.common.metrics.internals;
  
  import org.apache.kafka.common.metrics.Metrics;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  
  public class MetricsUtils {
      /**
       * Converts the provided time from milliseconds to the requested
       * time unit.
       */
      public static double convert(long timeMs, TimeUnit unit) {
          switch (unit) {
              case NANOSECONDS:
                  return timeMs * 1000.0 * 1000.0;
              case MICROSECONDS:
                  return timeMs * 1000.0;
              case MILLISECONDS:
                  return timeMs;
              case SECONDS:
                  return timeMs / 1000.0;
              case MINUTES:
                  return timeMs / (60.0 * 1000.0);
              case HOURS:
                  return timeMs / (60.0 * 60.0 * 1000.0);
              case DAYS:
                  return timeMs / (24.0 * 60.0 * 60.0 * 1000.0);
              default:
                  throw new IllegalStateException("Unknown unit: " + unit);
          }
      }
  
      /**
       * Create a set of tags using the supplied key and value pairs. The order of the tags will be kept.
       *
       * @param keyValue the key and value pairs for the tags; must be an even number
       * @return the map of tags that can be supplied to the {@link Metrics} methods; never null
       */
      public static Map<String, String> getTags(String... keyValue) {
          if ((keyValue.length % 2) != 0)
              throw new IllegalArgumentException("keyValue needs to be specified in pairs");
          Map<String, String> tags = new LinkedHashMap<>(keyValue.length / 2);
  
          for (int i = 0; i < keyValue.length; i += 2)
              tags.put(keyValue[i], keyValue[i + 1]);
          return tags;
      }
  }
  