1/*
2 * Copyright (C) 2010 Google Inc.
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 benchmarks;
18
19import com.google.caliper.Param;
20import com.google.caliper.Runner;
21import com.google.caliper.SimpleBenchmark;
22
23import java.util.ArrayList;
24
25/**
26 * Is a hand-coded counted loop through an ArrayList cheaper than enhanced for?
27 */
28public class ArrayListIterationBenchmark extends SimpleBenchmark {
29    ArrayList<Foo> mList = new ArrayList<Foo>();
30    {
31        for (int i = 0; i < 27; ++i) mList.add(new Foo());
32    }
33    public void timeArrayListIterationIndexed(int reps) {
34        for (int rep = 0; rep < reps; ++rep) {
35            int sum = 0;
36            ArrayList<Foo> list = mList;
37            int len = list.size();
38            for (int i = 0; i < len; ++i) {
39                sum += list.get(i).mSplat;
40            }
41        }
42    }
43    public void timeArrayListIterationForEach(int reps) {
44        for (int rep = 0; rep < reps; ++rep) {
45            int sum = 0;
46            for (Foo a : mList) {
47                sum += a.mSplat;
48            }
49        }
50    }
51}
52