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/*
* Copyright (C) 2013 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 android.text.TextUtils;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.Dictionary;
import com.android.inputmethod.latin.ExpandableBinaryDictionary;
import com.android.inputmethod.latin.NgramContext;
import com.android.inputmethod.latin.utils.DistracterFilter;
import java.io.File;
import java.util.Locale;
/**
* Locally gathers stats about the words user types and various other signals like auto-correction
* cancellation or manual picks. This allows the keyboard to adapt to the typist over time.
*/
public class UserHistoryDictionary extends DecayingExpandableBinaryDictionaryBase {
/* package */ static final String NAME = UserHistoryDictionary.class.getSimpleName();
private final static int SUPPORTED_NGRAM = 2; // TODO: 3
// TODO: Make this constructor private
/* package */ UserHistoryDictionary(final Context context, final Locale locale) {
super(context, getDictName(NAME, locale, null /* dictFile */), locale,
Dictionary.TYPE_USER_HISTORY, null /* dictFile */);
}
@UsedForTesting
public static UserHistoryDictionary getDictionary(final Context context, final Locale locale,
final File dictFile, final String dictNamePrefix) {
return PersonalizationHelper.getUserHistoryDictionary(context, locale);
}
/**
* Add a word to the user history dictionary.
*
* @param userHistoryDictionary the user history dictionary
* @param ngramContext the n-gram context
* @param word the word the user inputted
* @param isValid whether the word is valid or not
* @param timestamp the timestamp when the word has been inputted
* @param distracterFilter the filter to check whether the word is a distracter
*/
public static void addToDictionary(final ExpandableBinaryDictionary userHistoryDictionary,
final NgramContext ngramContext, final String word, final boolean isValid,
final int timestamp, final DistracterFilter distracterFilter) {
if (word.length() > Constants.DICTIONARY_MAX_WORD_LENGTH) {
return;
}
final int frequency = isValid ?
FREQUENCY_FOR_WORDS_IN_DICTS : FREQUENCY_FOR_WORDS_NOT_IN_DICTS;
userHistoryDictionary.addUnigramEntryWithCheckingDistracter(word, frequency,
null /* shortcutTarget */, 0 /* shortcutFreq */, false /* isNotAWord */,
false /* isBlacklisted */, timestamp, distracterFilter);
final boolean isBeginningOfSentenceContext = ngramContext.isBeginningOfSentenceContext();
final NgramContext ngramContextToBeSaved =
ngramContext.getTrimmedNgramContext(SUPPORTED_NGRAM - 1);
for (int i = 0; i < ngramContextToBeSaved.getPrevWordCount(); i++) {
final CharSequence prevWord = ngramContextToBeSaved.getNthPrevWord(1 /* n */);
if (prevWord == null || (prevWord.length() > Constants.DICTIONARY_MAX_WORD_LENGTH)) {
return;
}
// Do not insert a word as a bigram of itself
if (i == 0 && TextUtils.equals(word, prevWord)) {
return;
}
if (isBeginningOfSentenceContext) {
// Beginning-of-Sentence n-gram entry is added as an n-gram entry of an OOV word.
userHistoryDictionary.addNgramEntry(
ngramContextToBeSaved.getTrimmedNgramContext(i + 1), word,
FREQUENCY_FOR_WORDS_NOT_IN_DICTS, timestamp);
} else {
userHistoryDictionary.addNgramEntry(
ngramContextToBeSaved.getTrimmedNgramContext(i + 1), word, frequency,
timestamp);
}
}
}
}
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