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/*
* Copyright (C) 2009 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.os.SystemClock;
import android.provider.BaseColumns;
import android.provider.ContactsContract.Contacts;
import android.text.TextUtils;
import android.util.Log;
import com.android.inputmethod.keyboard.Keyboard;
public class ContactsDictionary extends ExpandableDictionary {
private static final String[] PROJECTION = {
BaseColumns._ID,
Contacts.DISPLAY_NAME,
};
private static final String TAG = "ContactsDictionary";
/**
* 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;
private long mLastLoadedContacts;
public ContactsDictionary(final Context context, final int dicTypeId) {
super(context, dicTypeId);
registerObserver(context);
loadDictionary();
}
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) {
getContext().getContentResolver().unregisterContentObserver(mObserver);
mObserver = null;
}
super.close();
}
@Override
public void startDictionaryLoadingTaskLocked() {
long now = SystemClock.uptimeMillis();
if (mLastLoadedContacts == 0
|| now - mLastLoadedContacts > 30 * 60 * 1000 /* 30 minutes */) {
super.startDictionaryLoadingTaskLocked();
}
}
@Override
public void loadDictionaryAsync() {
try {
Cursor cursor = getContext().getContentResolver()
.query(Contacts.CONTENT_URI, PROJECTION, null, null, null);
if (cursor != null) {
addWords(cursor);
}
} catch(IllegalStateException e) {
Log.e(TAG, "Contacts DB is having problems");
}
mLastLoadedContacts = SystemClock.uptimeMillis();
}
@Override
public void getBigrams(final WordComposer codes, final CharSequence previousWord,
final WordCallback callback) {
// Do not return bigrams from Contacts when nothing was typed.
if (codes.size() <= 0) return;
super.getBigrams(codes, previousWord, callback);
}
private void addWords(Cursor cursor) {
clearDictionary();
final int maxWordLength = getMaxWordLength();
try {
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
String name = cursor.getString(INDEX_NAME);
if (name != null && -1 == name.indexOf('@')) {
int len = name.length();
String prevWord = null;
// TODO: Better tokenization for non-Latin writing systems
for (int i = 0; i < len; i++) {
if (Character.isLetter(name.charAt(i))) {
int j;
for (j = i + 1; j < len; j++) {
char c = name.charAt(j);
if (!(c == Keyboard.CODE_DASH
|| c == Keyboard.CODE_SINGLE_QUOTE
|| Character.isLetter(c))) {
break;
}
}
String word = name.substring(i, j);
i = j - 1;
// Safeguard against adding really long words. Stack
// may overflow due to recursion
// Also don't add single letter words, possibly confuses
// capitalization of i.
final int wordLen = word.length();
if (wordLen < maxWordLength && wordLen > 1) {
super.addWord(word, FREQUENCY_FOR_CONTACTS);
if (!TextUtils.isEmpty(prevWord)) {
super.setBigram(prevWord, word,
FREQUENCY_FOR_CONTACTS_BIGRAM);
}
prevWord = word;
}
}
}
}
cursor.moveToNext();
}
}
cursor.close();
} catch(IllegalStateException e) {
Log.e(TAG, "Contacts DB is having problems");
}
}
}
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