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 */
16package benchmarks.regression;
17
18import android.icu.text.TimeZoneNames;
19
20import java.text.DateFormatSymbols;
21import java.text.ParseException;
22import java.text.SimpleDateFormat;
23import java.util.Arrays;
24import java.util.Date;
25import java.util.Locale;
26import java.util.TimeZone;
27
28/**
29 * Benchmark for java.text.SimpleDateFormat. This tests common formatting, parsing and creation
30 * operations with a specific focus on TimeZone handling.
31 */
32public class SimpleDateFormatBenchmark {
33    public void time_createFormatWithTimeZone(int reps) {
34        for (int i = 0; i < reps; i++) {
35            SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z");
36        }
37    }
38
39    public void time_parseWithTimeZoneShort(int reps) throws ParseException {
40        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z");
41        for (int i = 0; i < reps; i++) {
42            sdf.parse("2000.01.01 PST");
43        }
44    }
45
46    public void time_parseWithTimeZoneLong(int reps) throws ParseException {
47        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz");
48        for (int i = 0; i < reps; i++) {
49            sdf.parse("2000.01.01 Pacific Standard Time");
50        }
51    }
52
53    public void time_parseWithoutTimeZone(int reps) throws ParseException {
54        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd");
55        for (int i = 0; i < reps; i++) {
56            sdf.parse("2000.01.01");
57        }
58    }
59
60    public void time_createAndParseWithTimeZoneShort(int reps) throws ParseException {
61        for (int i = 0; i < reps; i++) {
62            SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z");
63            sdf.parse("2000.01.01 PST");
64        }
65    }
66
67    public void time_createAndParseWithTimeZoneLong(int reps) throws ParseException {
68        for (int i = 0; i < reps; i++) {
69            SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz");
70            sdf.parse("2000.01.01 Pacific Standard Time");
71        }
72    }
73
74    public void time_formatWithTimeZoneShort(int reps) {
75        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z");
76        for (int i = 0; i < reps; i++) {
77            sdf.format(new Date());
78        }
79    }
80
81    public void time_formatWithTimeZoneLong(int reps) {
82        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz");
83        for (int i = 0; i < reps; i++) {
84            sdf.format(new Date());
85        }
86    }
87
88    /**
89     * Times first-time execution to measure effects of initial loading of data that's lost in
90     * full caliper benchmarks.
91     */
92    public static void main(String[] args) throws ParseException {
93        long start, end;
94
95        Locale locale = Locale.GERMAN;
96        start = System.nanoTime();
97        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz", locale);
98        end = System.nanoTime();
99        System.out.printf("Creating first SDF: %,d ns\n", end-start);
100
101        // N code had special cases for currently-set and for default timezone. We want to measure
102        // the generic case.
103        sdf.setTimeZone(TimeZone.getTimeZone("Hongkong"));
104
105        start = System.nanoTime();
106        sdf.parse("2000.1.1 Kubanische Normalzeit");
107        end = System.nanoTime();
108        System.out.printf("First parse: %,d ns\n", end-start);
109
110        start = System.nanoTime();
111        sdf.format(new Date());
112        end = System.nanoTime();
113        System.out.printf("First format: %,d ns\n", end-start);
114    }
115}
116