1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package android.telecom;
18
19import java.util.Collection;
20import java.util.HashMap;
21import java.util.Map;
22
23/**
24 * @hide
25 */
26public abstract class TimedEvent<T> {
27    public abstract long getTime();
28    public abstract T getKey();
29
30    public static <T> Map<T, Double> averageTimings(Collection<? extends TimedEvent<T>> events) {
31        HashMap<T, Integer> counts = new HashMap<>();
32        HashMap<T, Double> result = new HashMap<>();
33
34        for (TimedEvent<T> entry : events) {
35            if (counts.containsKey(entry.getKey())) {
36                counts.put(entry.getKey(), counts.get(entry.getKey()) + 1);
37                result.put(entry.getKey(), result.get(entry.getKey()) + entry.getTime());
38            } else {
39                counts.put(entry.getKey(), 1);
40                result.put(entry.getKey(), (double) entry.getTime());
41            }
42        }
43
44        for (Map.Entry<T, Double> entry : result.entrySet()) {
45            result.put(entry.getKey(), entry.getValue() / counts.get(entry.getKey()));
46        }
47
48        return result;
49    }
50}
51
52