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/*
* Copyright (C) 2015 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 com.android.test.uibench;
import java.util.Random;
public class TextUtils {
private static final int STRING_COUNT = 200;
private static final int SIMPLE_STRING_LENGTH = 10;
/**
* Create word of random assortment of lower/upper case letters
*/
private static String randomWord(Random random, int length) {
String result = "";
for (int j = 0; j < length; j++) {
// add random letter
int base = random.nextInt(2) == 0 ? 'A' : 'a';
result += (char)(random.nextInt(26) + base);
}
return result;
}
public static String[] buildSimpleStringList() {
String[] strings = new String[STRING_COUNT];
Random random = new Random(0);
for (int i = 0; i < strings.length; i++) {
strings[i] = randomWord(random, SIMPLE_STRING_LENGTH);
}
return strings;
}
// a small number of strings reused frequently, expected to hit
// in the word-granularity text layout cache
static final String[] CACHE_HIT_STRINGS = new String[] {
"a",
"small",
"number",
"of",
"strings",
"reused",
"frequently"
};
private static final int WORDS_IN_PARAGRAPH = 150;
// misses are fairly long 'words' to ensure they miss
private static final int PARAGRAPH_MISS_MIN_LENGTH = 4;
private static final int PARAGRAPH_MISS_MAX_LENGTH = 9;
static String[] buildParagraphListWithHitPercentage(int hitPercentage) {
if (hitPercentage < 0 || hitPercentage > 100) throw new IllegalArgumentException();
String[] strings = new String[STRING_COUNT];
Random random = new Random(0);
for (int i = 0; i < strings.length; i++) {
String result = "";
for (int word = 0; word < WORDS_IN_PARAGRAPH; word++) {
if (word != 0) {
result += " ";
}
if (random.nextInt(100) < hitPercentage) {
// add a common word, which is very likely to hit in the cache
result += CACHE_HIT_STRINGS[random.nextInt(CACHE_HIT_STRINGS.length)];
} else {
// construct a random word, which will *most likely* miss
int length = PARAGRAPH_MISS_MIN_LENGTH;
length += random.nextInt(PARAGRAPH_MISS_MAX_LENGTH - PARAGRAPH_MISS_MIN_LENGTH);
result += randomWord(random, length);
}
}
strings[i] = result;
}
return strings;
}
}
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