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/*
* Copyright (C) 2012 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;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.provider.BaseColumns;
import android.provider.ContactsContract.Contacts;
import android.text.TextUtils;
import android.util.Log;
import com.android.inputmethod.keyboard.Keyboard;
import java.util.Locale;
public class ContactsBinaryDictionary extends ExpandableBinaryDictionary {
private static final String[] PROJECTION = {BaseColumns._ID, Contacts.DISPLAY_NAME,};
private static final String TAG = ContactsBinaryDictionary.class.getSimpleName();
private static final String NAME = "contacts";
/**
* Frequency for contacts information into the dictionary
*/
private static final int FREQUENCY_FOR_CONTACTS = 40;
private static final int FREQUENCY_FOR_CONTACTS_BIGRAM = 90;
private static final int INDEX_NAME = 1;
private ContentObserver mObserver;
/**
* Whether to use "firstname lastname" in bigram predictions.
*/
private final boolean mUseFirstLastBigrams;
public ContactsBinaryDictionary(final Context context, final int dicTypeId, Locale locale) {
super(context, getFilenameWithLocale(locale), dicTypeId);
mUseFirstLastBigrams = useFirstLastBigramsForLocale(locale);
registerObserver(context);
// Load the current binary dictionary from internal storage. If no binary dictionary exists,
// loadDictionary will start a new thread to generate one asynchronously.
loadDictionary();
}
private static String getFilenameWithLocale(Locale locale) {
return NAME + "." + locale.toString() + ".dict";
}
private synchronized void registerObserver(final Context context) {
// Perform a managed query. The Activity will handle closing and requerying the cursor
// when needed.
if (mObserver != null) return;
ContentResolver cres = context.getContentResolver();
cres.registerContentObserver(Contacts.CONTENT_URI, true, mObserver =
new ContentObserver(null) {
@Override
public void onChange(boolean self) {
setRequiresReload(true);
}
});
}
public void reopen(final Context context) {
registerObserver(context);
}
@Override
public synchronized void close() {
if (mObserver != null) {
mContext.getContentResolver().unregisterContentObserver(mObserver);
mObserver = null;
}
super.close();
}
@Override
public void loadDictionaryAsync() {
try {
Cursor cursor = mContext.getContentResolver()
.query(Contacts.CONTENT_URI, PROJECTION, null, null, null);
if (cursor != null) {
try {
if (cursor.moveToFirst()) {
addWords(cursor);
}
} finally {
cursor.close();
}
}
} catch (IllegalStateException e) {
Log.e(TAG, "Contacts DB is having problems");
}
}
@Override
public void getBigrams(final WordComposer codes, final CharSequence previousWord,
final WordCallback callback) {
super.getBigrams(codes, previousWord, callback);
}
private boolean useFirstLastBigramsForLocale(Locale locale) {
// TODO: Add firstname/lastname bigram rules for other languages.
if (locale != null && locale.getLanguage().equals(Locale.ENGLISH.getLanguage())) {
return true;
}
return false;
}
private void addWords(Cursor cursor) {
clearFusionDictionary();
while (!cursor.isAfterLast()) {
String name = cursor.getString(INDEX_NAME);
if (name != null && -1 == name.indexOf('@')) {
addName(name);
}
cursor.moveToNext();
}
}
/**
* Adds the words in a name (e.g., firstname/lastname) to the binary dictionary along with their
* bigrams depending on locale.
*/
private void addName(String name) {
int len = name.codePointCount(0, name.length());
String prevWord = null;
// TODO: Better tokenization for non-Latin writing systems
for (int i = 0; i < len; i++) {
if (Character.isLetter(name.codePointAt(i))) {
int j;
for (j = i + 1; j < len; j++) {
final int codePoint = name.codePointAt(j);
if (!(codePoint == Keyboard.CODE_DASH || codePoint == Keyboard.CODE_SINGLE_QUOTE
|| Character.isLetter(codePoint))) {
break;
}
}
String word = name.substring(i, j);
i = j - 1;
// Don't add single letter words, possibly confuses
// capitalization of i.
final int wordLen = word.codePointCount(0, word.length());
if (wordLen < MAX_WORD_LENGTH && wordLen > 1) {
super.addWord(word, FREQUENCY_FOR_CONTACTS);
if (!TextUtils.isEmpty(prevWord)) {
if (mUseFirstLastBigrams) {
super.setBigram(prevWord, word, FREQUENCY_FOR_CONTACTS_BIGRAM);
}
}
prevWord = word;
}
}
}
}
}
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