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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 com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.Dictionary;
import com.android.inputmethod.latin.ExpandableBinaryDictionary;
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();
// 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) {
return PersonalizationHelper.getUserHistoryDictionary(context, locale);
}
@Override
public boolean isValidWord(final String word) {
// Strings out of this dictionary should not be considered existing words.
return false;
}
/**
* Pair will be added to the user history dictionary.
*
* The first word may be null. That means we don't know the context, in other words,
* it's only a unigram. The first word may also be an empty string : this means start
* context, as in beginning of a sentence for example.
* The second word may not be null (a NullPointerException would be thrown).
*/
public static void addToDictionary(final ExpandableBinaryDictionary userHistoryDictionary,
final String word0, final String word1, final boolean isValid, final int timestamp) {
if (word1.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH ||
(word0 != null && word0.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH)) {
return;
}
final int frequency = isValid ?
FREQUENCY_FOR_WORDS_IN_DICTS : FREQUENCY_FOR_WORDS_NOT_IN_DICTS;
userHistoryDictionary.addWordDynamically(word1, frequency, null /* shortcutTarget */,
0 /* shortcutFreq */, false /* isNotAWord */, false /* isBlacklisted */, timestamp);
// Do not insert a word as a bigram of itself
if (word1.equals(word0)) {
return;
}
if (null != word0) {
userHistoryDictionary.addBigramDynamically(word0, word1, frequency, timestamp);
}
}
}
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