596 lines
26 KiB
Java
596 lines
26 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.database.sqlite.SQLiteQueryBuilder;
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import android.os.AsyncTask;
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import android.provider.BaseColumns;
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import android.util.Log;
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import com.android.inputmethod.keyboard.ProximityInfo;
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import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
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import com.android.inputmethod.latin.UserHistoryForgettingCurveUtils.ForgettingCurveParams;
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import java.lang.ref.SoftReference;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.locks.ReentrantLock;
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/**
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* Locally gathers stats about the words user types and various other signals like auto-correction
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* cancellation or manual picks. This allows the keyboard to adapt to the typist over time.
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*/
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public class UserHistoryDictionary extends ExpandableDictionary {
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private static final String TAG = "UserHistoryDictionary";
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public static final boolean DBG_SAVE_RESTORE = false;
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public static final boolean DBG_STRESS_TEST = false;
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public static final boolean DBG_ALWAYS_WRITE = false;
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public static final boolean PROFILE_SAVE_RESTORE = LatinImeLogger.sDBG;
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/** Any pair being typed or picked */
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private static final int FREQUENCY_FOR_TYPED = 2;
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/** Maximum number of pairs. Pruning will start when databases goes above this number. */
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private static int sMaxHistoryBigrams = 10000;
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/**
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* When it hits maximum bigram pair, it will delete until you are left with
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* only (sMaxHistoryBigrams - sDeleteHistoryBigrams) pairs.
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* Do not keep this number small to avoid deleting too often.
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*/
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private static int sDeleteHistoryBigrams = 1000;
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/**
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* Database version should increase if the database structure changes
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*/
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private static final int DATABASE_VERSION = 1;
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private static final String DATABASE_NAME = "userbigram_dict.db";
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/** Name of the words table in the database */
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private static final String MAIN_TABLE_NAME = "main";
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// TODO: Consume less space by using a unique id for locale instead of the whole
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// 2-5 character string.
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private static final String MAIN_COLUMN_ID = BaseColumns._ID;
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private static final String MAIN_COLUMN_WORD1 = "word1";
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private static final String MAIN_COLUMN_WORD2 = "word2";
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private static final String MAIN_COLUMN_LOCALE = "locale";
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/** Name of the frequency table in the database */
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private static final String FREQ_TABLE_NAME = "frequency";
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private static final String FREQ_COLUMN_ID = BaseColumns._ID;
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private static final String FREQ_COLUMN_PAIR_ID = "pair_id";
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private static final String COLUMN_FORGETTING_CURVE_VALUE = "freq";
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/** Locale for which this user history dictionary is storing words */
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private final String mLocale;
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private final UserHistoryDictionaryBigramList mBigramList =
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new UserHistoryDictionaryBigramList();
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private final ReentrantLock mBigramListLock = new ReentrantLock();
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private final SharedPreferences mPrefs;
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private final static HashMap<String, String> sDictProjectionMap;
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private final static ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>
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sLangDictCache = new ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>();
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static {
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sDictProjectionMap = new HashMap<String, String>();
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sDictProjectionMap.put(MAIN_COLUMN_ID, MAIN_COLUMN_ID);
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sDictProjectionMap.put(MAIN_COLUMN_WORD1, MAIN_COLUMN_WORD1);
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sDictProjectionMap.put(MAIN_COLUMN_WORD2, MAIN_COLUMN_WORD2);
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sDictProjectionMap.put(MAIN_COLUMN_LOCALE, MAIN_COLUMN_LOCALE);
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sDictProjectionMap.put(FREQ_COLUMN_ID, FREQ_COLUMN_ID);
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sDictProjectionMap.put(FREQ_COLUMN_PAIR_ID, FREQ_COLUMN_PAIR_ID);
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sDictProjectionMap.put(COLUMN_FORGETTING_CURVE_VALUE, COLUMN_FORGETTING_CURVE_VALUE);
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}
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private static DatabaseHelper sOpenHelper = null;
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public void setDatabaseMax(int maxHistoryBigram) {
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sMaxHistoryBigrams = maxHistoryBigram;
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}
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public void setDatabaseDelete(int deleteHistoryBigram) {
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sDeleteHistoryBigrams = deleteHistoryBigram;
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}
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public synchronized static UserHistoryDictionary getInstance(
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final Context context, final String locale, final SharedPreferences sp) {
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if (sLangDictCache.containsKey(locale)) {
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final SoftReference<UserHistoryDictionary> ref = sLangDictCache.get(locale);
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final UserHistoryDictionary dict = ref == null ? null : ref.get();
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if (dict != null) {
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if (PROFILE_SAVE_RESTORE) {
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Log.w(TAG, "Use cached UserHistoryDictionary for " + locale);
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}
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return dict;
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}
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}
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final UserHistoryDictionary dict =
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new UserHistoryDictionary(context, locale, sp);
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sLangDictCache.put(locale, new SoftReference<UserHistoryDictionary>(dict));
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return dict;
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}
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private UserHistoryDictionary(final Context context, final String locale,
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final SharedPreferences sp) {
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super(context, Dictionary.TYPE_USER_HISTORY);
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mLocale = locale;
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mPrefs = sp;
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if (sOpenHelper == null) {
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sOpenHelper = new DatabaseHelper(getContext());
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}
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if (mLocale != null && mLocale.length() > 1) {
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loadDictionary();
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}
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}
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@Override
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public void close() {
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flushPendingWrites();
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// Don't close the database as locale changes will require it to be reopened anyway
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// Also, the database is written to somewhat frequently, so it needs to be kept alive
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// throughout the life of the process.
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// mOpenHelper.close();
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// Ignore close because we cache UserHistoryDictionary for each language. See getInstance()
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// above.
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// super.close();
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}
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@Override
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protected ArrayList<SuggestedWordInfo> getWordsInner(final WordComposer composer,
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final CharSequence prevWord, final ProximityInfo proximityInfo) {
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// Inhibit suggestions (not predictions) for user history for now. Removing this method
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// is enough to use it through the standard ExpandableDictionary way.
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return null;
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}
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/**
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* Return whether the passed charsequence is in the dictionary.
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*/
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@Override
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public synchronized boolean isValidWord(final CharSequence word) {
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// TODO: figure out what is the correct thing to do here.
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return false;
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}
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/**
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* Pair will be added to the user history dictionary.
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*
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* The first word may be null. That means we don't know the context, in other words,
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* it's only a unigram. The first word may also be an empty string : this means start
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* context, as in beginning of a sentence for example.
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* The second word may not be null (a NullPointerException would be thrown).
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*/
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public int addToUserHistory(final String word1, String word2, boolean isValid) {
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if (mBigramListLock.tryLock()) {
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try {
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super.addWord(
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word2, null /* the "shortcut" parameter is null */, FREQUENCY_FOR_TYPED);
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// Do not insert a word as a bigram of itself
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if (word2.equals(word1)) {
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return 0;
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}
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final int freq;
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if (null == word1) {
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freq = FREQUENCY_FOR_TYPED;
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} else {
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freq = super.setBigramAndGetFrequency(
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word1, word2, new ForgettingCurveParams(isValid));
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}
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mBigramList.addBigram(word1, word2);
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return freq;
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} finally {
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mBigramListLock.unlock();
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}
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}
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return -1;
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}
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public boolean cancelAddingUserHistory(String word1, String word2) {
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if (mBigramListLock.tryLock()) {
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try {
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if (mBigramList.removeBigram(word1, word2)) {
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return super.removeBigram(word1, word2);
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}
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} finally {
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mBigramListLock.unlock();
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}
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}
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return false;
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}
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/**
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* Schedules a background thread to write any pending words to the database.
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*/
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private void flushPendingWrites() {
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if (mBigramListLock.isLocked()) {
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return;
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}
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// Create a background thread to write the pending entries
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new UpdateDbTask(sOpenHelper, mBigramList, mLocale, this, mPrefs).execute();
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}
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@Override
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public void loadDictionaryAsync() {
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// This must be run on non-main thread
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mBigramListLock.lock();
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try {
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loadDictionaryAsyncLocked();
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} finally {
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mBigramListLock.unlock();
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}
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}
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private void loadDictionaryAsyncLocked() {
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if (DBG_STRESS_TEST) {
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try {
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Log.w(TAG, "Start stress in loading: " + mLocale);
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Thread.sleep(15000);
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Log.w(TAG, "End stress in loading");
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} catch (InterruptedException e) {
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}
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}
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final long last = SettingsValues.getLastUserHistoryWriteTime(mPrefs, mLocale);
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final boolean initializing = last == 0;
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final long now = System.currentTimeMillis();
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// Load the words that correspond to the current input locale
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final Cursor cursor = query(MAIN_COLUMN_LOCALE + "=?", new String[] { mLocale });
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if (null == cursor) return;
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try {
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// TODO: Call SQLiteDataBase.beginTransaction / SQLiteDataBase.endTransaction
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if (cursor.moveToFirst()) {
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final int word1Index = cursor.getColumnIndex(MAIN_COLUMN_WORD1);
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final int word2Index = cursor.getColumnIndex(MAIN_COLUMN_WORD2);
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final int fcIndex = cursor.getColumnIndex(COLUMN_FORGETTING_CURVE_VALUE);
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while (!cursor.isAfterLast()) {
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final String word1 = cursor.getString(word1Index);
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final String word2 = cursor.getString(word2Index);
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final int fc = cursor.getInt(fcIndex);
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if (DBG_SAVE_RESTORE) {
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Log.d(TAG, "--- Load user history: " + word1 + ", " + word2 + ","
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+ mLocale + "," + this);
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}
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// Safeguard against adding really long words. Stack may overflow due
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// to recursive lookup
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if (null == word1) {
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super.addWord(word2, null /* shortcut */, fc);
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} else if (word1.length() < BinaryDictionary.MAX_WORD_LENGTH
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&& word2.length() < BinaryDictionary.MAX_WORD_LENGTH) {
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super.setBigramAndGetFrequency(
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word1, word2, initializing ? new ForgettingCurveParams(true)
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: new ForgettingCurveParams(fc, now, last));
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}
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mBigramList.addBigram(word1, word2, (byte)fc);
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cursor.moveToNext();
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}
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}
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} finally {
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cursor.close();
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if (PROFILE_SAVE_RESTORE) {
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final long diff = System.currentTimeMillis() - now;
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Log.w(TAG, "PROF: Load User HistoryDictionary: "
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+ mLocale + ", " + diff + "ms.");
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}
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}
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}
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/**
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* Query the database
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*/
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private static Cursor query(String selection, String[] selectionArgs) {
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SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
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// main INNER JOIN frequency ON (main._id=freq.pair_id)
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qb.setTables(MAIN_TABLE_NAME + " INNER JOIN " + FREQ_TABLE_NAME + " ON ("
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+ MAIN_TABLE_NAME + "." + MAIN_COLUMN_ID + "=" + FREQ_TABLE_NAME + "."
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+ FREQ_COLUMN_PAIR_ID +")");
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qb.setProjectionMap(sDictProjectionMap);
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// Get the database and run the query
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try {
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SQLiteDatabase db = sOpenHelper.getReadableDatabase();
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Cursor c = qb.query(db,
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new String[] {
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MAIN_COLUMN_WORD1, MAIN_COLUMN_WORD2, COLUMN_FORGETTING_CURVE_VALUE },
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selection, selectionArgs, null, null, null);
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return c;
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} catch (android.database.sqlite.SQLiteCantOpenDatabaseException e) {
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// Can't open the database : presumably we can't access storage. That may happen
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// when the device is wedged; do a best effort to still start the keyboard.
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return null;
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}
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}
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/**
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* This class helps open, create, and upgrade the database file.
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*/
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private static class DatabaseHelper extends SQLiteOpenHelper {
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DatabaseHelper(Context context) {
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super(context, DATABASE_NAME, null, DATABASE_VERSION);
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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db.execSQL("PRAGMA foreign_keys = ON;");
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db.execSQL("CREATE TABLE " + MAIN_TABLE_NAME + " ("
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+ MAIN_COLUMN_ID + " INTEGER PRIMARY KEY,"
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+ MAIN_COLUMN_WORD1 + " TEXT,"
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+ MAIN_COLUMN_WORD2 + " TEXT,"
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+ MAIN_COLUMN_LOCALE + " TEXT"
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+ ");");
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db.execSQL("CREATE TABLE " + FREQ_TABLE_NAME + " ("
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+ FREQ_COLUMN_ID + " INTEGER PRIMARY KEY,"
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+ FREQ_COLUMN_PAIR_ID + " INTEGER,"
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+ COLUMN_FORGETTING_CURVE_VALUE + " INTEGER,"
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+ "FOREIGN KEY(" + FREQ_COLUMN_PAIR_ID + ") REFERENCES " + MAIN_TABLE_NAME
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+ "(" + MAIN_COLUMN_ID + ")" + " ON DELETE CASCADE"
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+ ");");
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
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+ newVersion + ", which will destroy all old data");
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db.execSQL("DROP TABLE IF EXISTS " + MAIN_TABLE_NAME);
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db.execSQL("DROP TABLE IF EXISTS " + FREQ_TABLE_NAME);
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onCreate(db);
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}
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}
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/**
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* Async task to write pending words to the database so that it stays in sync with
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* the in-memory trie.
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*/
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private static class UpdateDbTask extends AsyncTask<Void, Void, Void> {
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private final UserHistoryDictionaryBigramList mBigramList;
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private final DatabaseHelper mDbHelper;
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private final String mLocale;
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private final UserHistoryDictionary mUserHistoryDictionary;
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private final SharedPreferences mPrefs;
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public UpdateDbTask(
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DatabaseHelper openHelper, UserHistoryDictionaryBigramList pendingWrites,
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String locale, UserHistoryDictionary dict, SharedPreferences prefs) {
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mBigramList = pendingWrites;
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mLocale = locale;
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mDbHelper = openHelper;
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mUserHistoryDictionary = dict;
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mPrefs = prefs;
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}
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/** Prune any old data if the database is getting too big. */
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private static void checkPruneData(SQLiteDatabase db) {
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db.execSQL("PRAGMA foreign_keys = ON;");
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Cursor c = db.query(FREQ_TABLE_NAME, new String[] { FREQ_COLUMN_PAIR_ID },
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null, null, null, null, null);
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try {
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int totalRowCount = c.getCount();
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// prune out old data if we have too much data
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if (totalRowCount > sMaxHistoryBigrams) {
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int numDeleteRows = (totalRowCount - sMaxHistoryBigrams)
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+ sDeleteHistoryBigrams;
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int pairIdColumnId = c.getColumnIndex(FREQ_COLUMN_PAIR_ID);
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c.moveToFirst();
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int count = 0;
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while (count < numDeleteRows && !c.isAfterLast()) {
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String pairId = c.getString(pairIdColumnId);
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// Deleting from MAIN table will delete the frequencies
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// due to FOREIGN KEY .. ON DELETE CASCADE
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db.delete(MAIN_TABLE_NAME, MAIN_COLUMN_ID + "=?",
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new String[] { pairId });
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c.moveToNext();
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count++;
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}
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}
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} finally {
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c.close();
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}
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}
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@Override
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protected Void doInBackground(Void... v) {
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SQLiteDatabase db = null;
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if (mUserHistoryDictionary.mBigramListLock.tryLock()) {
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try {
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try {
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db = mDbHelper.getWritableDatabase();
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} catch (android.database.sqlite.SQLiteCantOpenDatabaseException e) {
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// If we can't open the db, don't do anything. Exit through the next test
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// for non-nullity of the db variable.
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}
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if (null == db) {
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// Not much we can do. Just exit.
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return null;
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}
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db.beginTransaction();
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return doLoadTaskLocked(db);
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} finally {
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if (db != null) {
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db.endTransaction();
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}
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mUserHistoryDictionary.mBigramListLock.unlock();
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}
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}
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return null;
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}
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private Void doLoadTaskLocked(SQLiteDatabase db) {
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if (DBG_STRESS_TEST) {
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try {
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Log.w(TAG, "Start stress in closing: " + mLocale);
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Thread.sleep(15000);
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Log.w(TAG, "End stress in closing");
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} catch (InterruptedException e) {
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}
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}
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final long now = PROFILE_SAVE_RESTORE ? System.currentTimeMillis() : 0;
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int profTotal = 0;
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int profInsert = 0;
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int profDelete = 0;
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db.execSQL("PRAGMA foreign_keys = ON;");
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final boolean addLevel0Bigram = mBigramList.size() <= sMaxHistoryBigrams;
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// Write all the entries to the db
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for (String word1 : mBigramList.keySet()) {
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final HashMap<String, Byte> word1Bigrams = mBigramList.getBigrams(word1);
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for (String word2 : word1Bigrams.keySet()) {
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if (PROFILE_SAVE_RESTORE) {
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++profTotal;
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}
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// Get new frequency. Do not insert unigrams/bigrams which freq is "-1".
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final int freq; // -1, or 0~255
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if (word1 == null) { // unigram
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freq = FREQUENCY_FOR_TYPED;
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final byte prevFc = word1Bigrams.get(word2);
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if (prevFc == FREQUENCY_FOR_TYPED) {
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// No need to update since we found no changes for this entry.
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// Just skip to the next entry.
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if (DBG_SAVE_RESTORE) {
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Log.d(TAG, "Skip update user history: " + word1 + "," + word2
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+ "," + prevFc);
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}
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if (!DBG_ALWAYS_WRITE) {
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continue;
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}
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}
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} else { // bigram
|
|
final NextWord nw = mUserHistoryDictionary.getBigramWord(word1, word2);
|
|
if (nw != null) {
|
|
final ForgettingCurveParams fcp = nw.getFcParams();
|
|
final byte prevFc = word1Bigrams.get(word2);
|
|
final byte fc = (byte)fcp.getFc();
|
|
final boolean isValid = fcp.isValid();
|
|
if (prevFc > 0 && prevFc == fc) {
|
|
// No need to update since we found no changes for this entry.
|
|
// Just skip to the next entry.
|
|
if (DBG_SAVE_RESTORE) {
|
|
Log.d(TAG, "Skip update user history: " + word1 + ","
|
|
+ word2 + "," + prevFc);
|
|
}
|
|
if (!DBG_ALWAYS_WRITE) {
|
|
continue;
|
|
} else {
|
|
freq = fc;
|
|
}
|
|
} else if (UserHistoryForgettingCurveUtils.
|
|
needsToSave(fc, isValid, addLevel0Bigram)) {
|
|
freq = fc;
|
|
} else {
|
|
freq = -1;
|
|
}
|
|
} else {
|
|
freq = -1;
|
|
}
|
|
}
|
|
// TODO: this process of making a text search for each pair each time
|
|
// is terribly inefficient. Optimize this.
|
|
// Find pair id
|
|
Cursor c = null;
|
|
try {
|
|
if (null != word1) {
|
|
c = db.query(MAIN_TABLE_NAME, new String[] { MAIN_COLUMN_ID },
|
|
MAIN_COLUMN_WORD1 + "=? AND " + MAIN_COLUMN_WORD2 + "=? AND "
|
|
+ MAIN_COLUMN_LOCALE + "=?",
|
|
new String[] { word1, word2, mLocale }, null, null,
|
|
null);
|
|
} else {
|
|
c = db.query(MAIN_TABLE_NAME, new String[] { MAIN_COLUMN_ID },
|
|
MAIN_COLUMN_WORD1 + " IS NULL AND " + MAIN_COLUMN_WORD2
|
|
+ "=? AND " + MAIN_COLUMN_LOCALE + "=?",
|
|
new String[] { word2, mLocale }, null, null, null);
|
|
}
|
|
|
|
final int pairId;
|
|
if (c.moveToFirst()) {
|
|
if (PROFILE_SAVE_RESTORE) {
|
|
++profDelete;
|
|
}
|
|
// Delete existing pair
|
|
pairId = c.getInt(c.getColumnIndex(MAIN_COLUMN_ID));
|
|
db.delete(FREQ_TABLE_NAME, FREQ_COLUMN_PAIR_ID + "=?",
|
|
new String[] { Integer.toString(pairId) });
|
|
} else {
|
|
// Create new pair
|
|
Long pairIdLong = db.insert(MAIN_TABLE_NAME, null,
|
|
getContentValues(word1, word2, mLocale));
|
|
pairId = pairIdLong.intValue();
|
|
}
|
|
if (freq > 0) {
|
|
if (PROFILE_SAVE_RESTORE) {
|
|
++profInsert;
|
|
}
|
|
if (DBG_SAVE_RESTORE) {
|
|
Log.d(TAG, "--- Save user history: " + word1 + ", " + word2
|
|
+ mLocale + "," + this);
|
|
}
|
|
// Insert new frequency
|
|
db.insert(FREQ_TABLE_NAME, null,
|
|
getFrequencyContentValues(pairId, freq));
|
|
// Update an existing bigram entry in mBigramList too in order to
|
|
// synchronize the SQL DB and mBigramList.
|
|
mBigramList.updateBigram(word1, word2, (byte)freq);
|
|
}
|
|
} finally {
|
|
if (c != null) {
|
|
c.close();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
checkPruneData(db);
|
|
// Save the timestamp after we finish writing the SQL DB.
|
|
SettingsValues.setLastUserHistoryWriteTime(mPrefs, mLocale);
|
|
if (PROFILE_SAVE_RESTORE) {
|
|
final long diff = System.currentTimeMillis() - now;
|
|
Log.w(TAG, "PROF: Write User HistoryDictionary: " + mLocale + ", "+ diff
|
|
+ "ms. Total: " + profTotal + ". Insert: " + profInsert + ". Delete: "
|
|
+ profDelete);
|
|
}
|
|
db.setTransactionSuccessful();
|
|
return null;
|
|
}
|
|
|
|
private static ContentValues getContentValues(String word1, String word2, String locale) {
|
|
ContentValues values = new ContentValues(3);
|
|
values.put(MAIN_COLUMN_WORD1, word1);
|
|
values.put(MAIN_COLUMN_WORD2, word2);
|
|
values.put(MAIN_COLUMN_LOCALE, locale);
|
|
return values;
|
|
}
|
|
|
|
private static ContentValues getFrequencyContentValues(int pairId, int frequency) {
|
|
ContentValues values = new ContentValues(2);
|
|
values.put(FREQ_COLUMN_PAIR_ID, pairId);
|
|
values.put(COLUMN_FORGETTING_CURVE_VALUE, frequency);
|
|
return values;
|
|
}
|
|
}
|
|
|
|
}
|