content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed 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 android.telecom.Logging;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * @hide
   */
  public abstract class TimedEvent<T> {
      public abstract long getTime();
      public abstract T getKey();
  
      public static <T> Map<T, Double> averageTimings(Collection<? extends TimedEvent<T>> events) {
          HashMap<T, Integer> counts = new HashMap<>();
          HashMap<T, Double> result = new HashMap<>();
  
          for (TimedEvent<T> entry : events) {
              if (counts.containsKey(entry.getKey())) {
                  counts.put(entry.getKey(), counts.get(entry.getKey()) + 1);
                  result.put(entry.getKey(), result.get(entry.getKey()) + entry.getTime());
              } else {
                  counts.put(entry.getKey(), 1);
                  result.put(entry.getKey(), (double) entry.getTime());
              }
          }
  
          for (Map.Entry<T, Double> entry : result.entrySet()) {
              result.put(entry.getKey(), entry.getValue() / counts.get(entry.getKey()));
          }
  
          return result;
      }
  }
  