137 lines
5.2 KiB
Java
137 lines
5.2 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin.personalization;
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import android.content.Context;
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import com.android.inputmethod.annotations.ExternallyReferenced;
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import com.android.inputmethod.annotations.UsedForTesting;
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import com.android.inputmethod.latin.BinaryDictionary;
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import com.android.inputmethod.latin.Dictionary;
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import com.android.inputmethod.latin.ExpandableBinaryDictionary;
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import com.android.inputmethod.latin.NgramContext;
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import com.android.inputmethod.latin.define.DecoderSpecificConstants;
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import com.android.inputmethod.latin.define.ProductionFlags;
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import com.android.inputmethod.latin.makedict.DictionaryHeader;
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import java.io.File;
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import java.util.Locale;
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import java.util.Map;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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/**
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* Locally gathers statistics about the words user types and various other signals like
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* auto-correction cancellation or manual picks. This allows the keyboard to adapt to the
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* typist over time.
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*/
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public class UserHistoryDictionary extends ExpandableBinaryDictionary {
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static final String NAME = UserHistoryDictionary.class.getSimpleName();
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// TODO: Make this constructor private
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UserHistoryDictionary(final Context context, final Locale locale,
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@Nullable final String account) {
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super(context, getUserHistoryDictName(NAME, locale, null /* dictFile */, account), locale, Dictionary.TYPE_USER_HISTORY, null);
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if (mLocale != null && mLocale.toString().length() > 1) {
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reloadDictionaryIfRequired();
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}
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}
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/**
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* @returns the name of the {@link UserHistoryDictionary}.
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*/
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@UsedForTesting
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static String getUserHistoryDictName(final String name, final Locale locale,
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@Nullable final File dictFile, @Nullable final String account) {
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if (!ProductionFlags.ENABLE_PER_ACCOUNT_USER_HISTORY_DICTIONARY) {
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return getDictName(name, locale, dictFile);
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}
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return getUserHistoryDictNamePerAccount(name, locale, dictFile, account);
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}
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/**
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* Uses the currently signed in account to determine the dictionary name.
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*/
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private static String getUserHistoryDictNamePerAccount(final String name, final Locale locale,
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@Nullable final File dictFile, @Nullable final String account) {
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if (dictFile != null) {
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return dictFile.getName();
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}
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String dictName = name + "." + locale.toString();
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if (account != null) {
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dictName += "." + account;
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}
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return dictName;
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}
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// Note: This method is called by {@link DictionaryFacilitator} using Java reflection.
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@SuppressWarnings("unused")
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@ExternallyReferenced
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public static UserHistoryDictionary getDictionary(final Context context, final Locale locale,
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final File dictFile, final String dictNamePrefix, @Nullable final String account) {
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return PersonalizationHelper.getUserHistoryDictionary(context, locale, account);
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}
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/**
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* Add a word to the user history dictionary.
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*
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* @param userHistoryDictionary the user history dictionary
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* @param ngramContext the n-gram context
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* @param word the word the user inputted
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* @param isValid whether the word is valid or not
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* @param timestamp the timestamp when the word has been inputted
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*/
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public static void addToDictionary(final ExpandableBinaryDictionary userHistoryDictionary,
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@Nonnull final NgramContext ngramContext, final String word, final boolean isValid,
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final int timestamp) {
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if (word.length() > BinaryDictionary.DICTIONARY_MAX_WORD_LENGTH) {
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return;
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}
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userHistoryDictionary.updateEntriesForWord(ngramContext, word,
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isValid, 1 /* count */, timestamp);
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}
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@Override
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public void close() {
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// Flush pending writes.
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asyncFlushBinaryDictionary();
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super.close();
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}
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@Override
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protected Map<String, String> getHeaderAttributeMap() {
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final Map<String, String> attributeMap = super.getHeaderAttributeMap();
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attributeMap.put(DictionaryHeader.USES_FORGETTING_CURVE_KEY,
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DictionaryHeader.ATTRIBUTE_VALUE_TRUE);
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attributeMap.put(DictionaryHeader.HAS_HISTORICAL_INFO_KEY,
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DictionaryHeader.ATTRIBUTE_VALUE_TRUE);
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return attributeMap;
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}
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@Override
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protected void loadInitialContentsLocked() {
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// No initial contents.
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}
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@Override
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public boolean isValidWord(final String word) {
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// Strings out of this dictionary should not be considered existing words.
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return false;
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}
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}
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