1 /*
2  * Copyright (C) 2019 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 
17 public class StringBuilderAppendBenchmark {
18     public static String string1 = "s1";
19     public static String string2 = "s2";
20     public static String longString1 = "This is a long string 1";
21     public static String longString2 = "This is a long string 2";
22     public static int int1 = 42;
23     public static double double1 = 42.0;
24     public static double double2 = 1.0E308;
25     public static float float1 = 42.0f;
26     public static float float2 = 1.0E38f;
27 
timeAppendStrings(int count)28     public void timeAppendStrings(int count) {
29         String s1 = string1;
30         String s2 = string2;
31         int sum = 0;
32         for (int i = 0; i < count; ++i) {
33             String result = s1 + s2;
34             sum += result.length();  // Make sure the append is not optimized away.
35         }
36         if (sum != count * (s1.length() + s2.length())) {
37             throw new AssertionError();
38         }
39     }
40 
timeAppendLongStrings(int count)41     public void timeAppendLongStrings(int count) {
42         String s1 = longString1;
43         String s2 = longString2;
44         int sum = 0;
45         for (int i = 0; i < count; ++i) {
46             String result = s1 + s2;
47             sum += result.length();  // Make sure the append is not optimized away.
48         }
49         if (sum != count * (s1.length() + s2.length())) {
50             throw new AssertionError();
51         }
52     }
53 
timeAppendStringAndInt(int count)54     public void timeAppendStringAndInt(int count) {
55         String s1 = string1;
56         int i1 = int1;
57         int sum = 0;
58         for (int i = 0; i < count; ++i) {
59             String result = s1 + i1;
60             sum += result.length();  // Make sure the append is not optimized away.
61         }
62         if (sum != count * (s1.length() + Integer.toString(i1).length())) {
63             throw new AssertionError();
64         }
65     }
66 
timeAppendStringAndDouble(int count)67     public void timeAppendStringAndDouble(int count) {
68         String s1 = string1;
69         double d1 = double1;
70         int sum = 0;
71         for (int i = 0; i < count; ++i) {
72             String result = s1 + d1;
73             sum += result.length();  // Make sure the append is not optimized away.
74         }
75         if (sum != count * (s1.length() + Double.toString(d1).length())) {
76             throw new AssertionError();
77         }
78     }
79 
timeAppendStringAndHugeDouble(int count)80     public void timeAppendStringAndHugeDouble(int count) {
81         String s1 = string1;
82         double d2 = double2;
83         int sum = 0;
84         for (int i = 0; i < count; ++i) {
85             String result = s1 + d2;
86             sum += result.length();  // Make sure the append is not optimized away.
87         }
88         if (sum != count * (s1.length() + Double.toString(d2).length())) {
89             throw new AssertionError();
90         }
91     }
92 
timeAppendStringAndFloat(int count)93     public void timeAppendStringAndFloat(int count) {
94         String s1 = string1;
95         float f1 = float1;
96         int sum = 0;
97         for (int i = 0; i < count; ++i) {
98             String result = s1 + f1;
99             sum += result.length();  // Make sure the append is not optimized away.
100         }
101         if (sum != count * (s1.length() + Float.toString(f1).length())) {
102             throw new AssertionError();
103         }
104     }
105 
timeAppendStringAndHugeFloat(int count)106     public void timeAppendStringAndHugeFloat(int count) {
107         String s1 = string1;
108         float f2 = float2;
109         int sum = 0;
110         for (int i = 0; i < count; ++i) {
111             String result = s1 + f2;
112             sum += result.length();  // Make sure the append is not optimized away.
113         }
114         if (sum != count * (s1.length() + Float.toString(f2).length())) {
115             throw new AssertionError();
116         }
117     }
118 
timeAppendStringDoubleStringAndFloat(int count)119     public void timeAppendStringDoubleStringAndFloat(int count) {
120         String s1 = string1;
121         String s2 = string2;
122         double d1 = double1;
123         float f1 = float1;
124         int sum = 0;
125         for (int i = 0; i < count; ++i) {
126             String result = s1 + d1 + s2 + f1;
127             sum += result.length();  // Make sure the append is not optimized away.
128         }
129         if (sum != count * (s1.length() +
130                             Double.toString(d1).length() +
131                             s2.length() +
132                             Float.toString(f1).length())) {
133             throw new AssertionError();
134         }
135     }
136 }
137