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/*
* Copyright (C) 2014 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.inputmethod.latin.personalization;
import android.content.Context;
import com.android.inputmethod.latin.BinaryDictionary;
import com.android.inputmethod.latin.NgramContext;
import com.android.inputmethod.latin.NgramContext.WordInfo;
import com.android.inputmethod.latin.common.FileUtils;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Random;
/**
* Utility class for helping while running tests involving {@link UserHistoryDictionary}.
*/
public class UserHistoryDictionaryTestsHelper {
/**
* Locale prefix for generating placeholder locales for tests.
*/
public static final String TEST_LOCALE_PREFIX = "test-";
/**
* Characters for generating random words.
*/
private static final String[] CHARACTERS = {
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"
};
/**
* Remove all the test dictionary files created for the given locale.
*/
public static void removeAllTestDictFiles(final String filter, final Context context) {
final FilenameFilter filenameFilter = new FilenameFilter() {
@Override
public boolean accept(final File dir, final String filename) {
return filename.startsWith(UserHistoryDictionary.NAME + "." + filter);
}
};
FileUtils.deleteFilteredFiles(context.getFilesDir(), filenameFilter);
}
/**
* Generates and writes random words to dictionary. Caller can be assured
* that the write tasks would be finished; and its success would be reflected
* in the returned boolean.
*
* @param dict {@link UserHistoryDictionary} to which words should be added.
* @param numberOfWords number of words to be added.
* @param random helps generate random words.
* @param checkContents if true, checks whether written words are actually in the dictionary.
* @param currentTime timestamp that would be used for adding the words.
* @returns true if all words have been written to dictionary successfully.
*/
public static boolean addAndWriteRandomWords(final UserHistoryDictionary dict,
final int numberOfWords, final Random random, final boolean checkContents,
final int currentTime) {
final List<String> words = generateWords(numberOfWords, random);
// Add random words to the user history dictionary.
addWordsToDictionary(dict, words, currentTime);
boolean success = true;
if (checkContents) {
dict.waitAllTasksForTests();
for (int i = 0; i < numberOfWords; ++i) {
final String word = words.get(i);
if (!dict.isInDictionary(word)) {
success = false;
break;
}
}
}
// write to file.
dict.close();
dict.waitAllTasksForTests();
return success;
}
private static void addWordsToDictionary(final UserHistoryDictionary dict,
final List<String> words, final int timestamp) {
NgramContext ngramContext = NgramContext.getEmptyPrevWordsContext(
BinaryDictionary.MAX_PREV_WORD_COUNT_FOR_N_GRAM);
for (final String word : words) {
UserHistoryDictionary.addToDictionary(dict, ngramContext, word, true, timestamp);
ngramContext = ngramContext.getNextNgramContext(new WordInfo(word));
}
}
/**
* Creates unique test locale for using within tests.
*/
public static Locale getFakeLocale(final String name) {
return new Locale(TEST_LOCALE_PREFIX + name + System.currentTimeMillis());
}
/**
* Generates random words.
*
* @param numberOfWords number of words to generate.
* @param random salt used for generating random words.
*/
public static List<String> generateWords(final int numberOfWords, final Random random) {
final HashSet<String> wordSet = new HashSet<>();
while (wordSet.size() < numberOfWords) {
wordSet.add(generateWord(random.nextInt()));
}
return new ArrayList<>(wordSet);
}
/**
* Generates a random word.
*/
private static String generateWord(final int value) {
final int lengthOfChars = CHARACTERS.length;
final StringBuilder builder = new StringBuilder();
long lvalue = Math.abs((long)value);
while (lvalue > 0) {
builder.append(CHARACTERS[(int)(lvalue % lengthOfChars)]);
lvalue /= lengthOfChars;
}
return builder.toString();
}
}
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