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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.AsyncTask;
import android.os.SystemClock;
import android.provider.ContactsContract.Contacts;
public class ContactsDictionary extends ExpandableDictionary {
private static final String[] PROJECTION = {
Contacts._ID,
Contacts.DISPLAY_NAME,
};
private static final int INDEX_NAME = 1;
private ContentObserver mObserver;
private boolean mRequiresReload;
private long mLastLoadedContacts;
private boolean mUpdatingContacts;
// Use this lock before touching mUpdatingContacts & mRequiresDownload
private Object mUpdatingLock = new Object();
public ContactsDictionary(Context context) {
super(context);
// Perform a managed query. The Activity will handle closing and requerying the cursor
// when needed.
ContentResolver cres = context.getContentResolver();
cres.registerContentObserver(Contacts.CONTENT_URI, true, mObserver = new ContentObserver(null) {
@Override
public void onChange(boolean self) {
synchronized (mUpdatingLock) {
mRequiresReload = true;
}
}
});
synchronized (mUpdatingLock) {
loadDictionaryAsyncLocked();
}
}
public synchronized void close() {
if (mObserver != null) {
getContext().getContentResolver().unregisterContentObserver(mObserver);
mObserver = null;
}
}
private synchronized void loadDictionaryAsyncLocked() {
long now = SystemClock.uptimeMillis();
if (mLastLoadedContacts == 0
|| now - mLastLoadedContacts > 30 * 60 * 1000 /* 30 minutes */) {
if (!mUpdatingContacts) {
mUpdatingContacts = true;
mRequiresReload = false;
new LoadContactsTask().execute();
}
}
}
@Override
public synchronized void getWords(final WordComposer codes, final WordCallback callback,
int[] nextLettersFrequencies) {
synchronized (mUpdatingLock) {
// If we need to update, start off a background task
if (mRequiresReload) loadDictionaryAsyncLocked();
// Currently updating contacts, don't return any results.
if (mUpdatingContacts) return;
}
super.getWords(codes, callback, nextLettersFrequencies);
}
@Override
public synchronized boolean isValidWord(CharSequence word) {
synchronized (mUpdatingLock) {
// If we need to update, start off a background task
if (mRequiresReload) loadDictionaryAsyncLocked();
if (mUpdatingContacts) return false;
}
return super.isValidWord(word);
}
private void addWords(Cursor cursor) {
clearDictionary();
final int maxWordLength = getMaxWordLength();
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
String name = cursor.getString(INDEX_NAME);
if (name != null) {
int len = name.length();
// 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 == '-' || c == '\'' ||
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, 128);
}
}
}
}
cursor.moveToNext();
}
}
cursor.close();
}
private class LoadContactsTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... v) {
Cursor cursor = getContext().getContentResolver()
.query(Contacts.CONTENT_URI, PROJECTION, null, null, null);
if (cursor != null) {
addWords(cursor);
}
mLastLoadedContacts = SystemClock.uptimeMillis();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
synchronized (mUpdatingLock) {
mUpdatingContacts = false;
}
super.onPostExecute(result);
}
}
}
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