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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 com.android.inputmethod.latin.makedict.DictionaryHeader;
import com.android.inputmethod.latin.utils.LanguageModelParam;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.TimeUnit;
/**
* This class is a base class of a dictionary that supports decaying for the personalized language
* model.
*/
public abstract class DecayingExpandableBinaryDictionaryBase extends ExpandableBinaryDictionary {
private static final String TAG = DecayingExpandableBinaryDictionaryBase.class.getSimpleName();
private static final boolean DBG_DUMP_ON_CLOSE = false;
/** Any pair being typed or picked */
public static final int FREQUENCY_FOR_TYPED = 2;
public static final int FREQUENCY_FOR_WORDS_IN_DICTS = FREQUENCY_FOR_TYPED;
public static final int FREQUENCY_FOR_WORDS_NOT_IN_DICTS = Dictionary.NOT_A_PROBABILITY;
/** The locale for this dictionary. */
public final Locale mLocale;
private final String mDictName;
/* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
final Locale locale, final String dictionaryType, final String dictName) {
super(context, dictName, locale, dictionaryType, true);
mLocale = locale;
mDictName = dictName;
if (mLocale != null && mLocale.toString().length() > 1) {
reloadDictionaryIfRequired();
}
}
// Creates an instance that uses a given dictionary file for testing.
@UsedForTesting
/* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
final Locale locale, final String dictionaryType, final String dictName,
final File dictFile) {
super(context, dictName, locale, dictionaryType, true, dictFile);
mLocale = locale;
mDictName = dictName;
if (mLocale != null && mLocale.toString().length() > 1) {
reloadDictionaryIfRequired();
}
}
@Override
public void close() {
if (DBG_DUMP_ON_CLOSE) {
dumpAllWordsForDebug();
}
// Flush pending writes.
asyncFlushBinaryDictionary();
}
@Override
protected Map<String, String> getHeaderAttributeMap() {
HashMap<String, String> attributeMap = new HashMap<String, String>();
attributeMap.put(DictionaryHeader.USES_FORGETTING_CURVE_KEY,
DictionaryHeader.ATTRIBUTE_VALUE_TRUE);
attributeMap.put(DictionaryHeader.HAS_HISTORICAL_INFO_KEY,
DictionaryHeader.ATTRIBUTE_VALUE_TRUE);
attributeMap.put(DictionaryHeader.DICTIONARY_ID_KEY, mDictName);
attributeMap.put(DictionaryHeader.DICTIONARY_LOCALE_KEY, mLocale.toString());
attributeMap.put(DictionaryHeader.DICTIONARY_VERSION_KEY,
String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())));
return attributeMap;
}
@Override
protected boolean hasContentChanged() {
return false;
}
@Override
protected boolean needsToReloadBeforeWriting() {
return false;
}
public void addMultipleDictionaryEntriesToDictionary(
final ArrayList<LanguageModelParam> languageModelParams,
final ExpandableBinaryDictionary.AddMultipleDictionaryEntriesCallback callback) {
if (languageModelParams == null || languageModelParams.isEmpty()) {
if (callback != null) {
callback.onFinished();
}
return;
}
addMultipleDictionaryEntriesDynamically(languageModelParams, callback);
}
/**
* Pair will be added to the decaying 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 void addToDictionary(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;
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) {
addBigramDynamically(word0, word1, frequency, timestamp);
}
}
@Override
protected void loadDictionaryAsync() {
// Never loaded to memory in Java side.
}
@UsedForTesting
public void clearAndFlushDictionary() {
// Clear the node structure on memory
clear();
// Then flush the cleared state of the dictionary on disk.
asyncFlushBinaryDictionary();
}
/* package */ void decayIfNeeded() {
runGCIfRequired(false /* mindsBlockByGC */);
}
}
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