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/*
* Copyright (C) 2014 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 org.kelar.inputmethod.latin;
import android.Manifest;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.os.SystemClock;
import android.provider.ContactsContract.Contacts;
import android.util.Log;
import org.kelar.inputmethod.latin.ContactsManager.ContactsChangedListener;
import org.kelar.inputmethod.latin.define.DebugFlags;
import org.kelar.inputmethod.latin.permissions.PermissionsUtil;
import org.kelar.inputmethod.latin.utils.ExecutorUtils;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A content observer that listens to updates to content provider {@link Contacts#CONTENT_URI}.
*/
public class ContactsContentObserver implements Runnable {
private static final String TAG = "ContactsContentObserver";
private final Context mContext;
private final ContactsManager mManager;
private final AtomicBoolean mRunning = new AtomicBoolean(false);
private ContentObserver mContentObserver;
private ContactsChangedListener mContactsChangedListener;
public ContactsContentObserver(final ContactsManager manager, final Context context) {
mManager = manager;
mContext = context;
}
public void registerObserver(final ContactsChangedListener listener) {
if (!PermissionsUtil.checkAllPermissionsGranted(
mContext, Manifest.permission.READ_CONTACTS)) {
Log.i(TAG, "No permission to read contacts. Not registering the observer.");
// do nothing if we do not have the permission to read contacts.
return;
}
if (DebugFlags.DEBUG_ENABLED) {
Log.d(TAG, "registerObserver()");
}
mContactsChangedListener = listener;
mContentObserver = new ContentObserver(null /* handler */) {
@Override
public void onChange(boolean self) {
ExecutorUtils.getBackgroundExecutor(ExecutorUtils.KEYBOARD)
.execute(ContactsContentObserver.this);
}
};
final ContentResolver contentResolver = mContext.getContentResolver();
contentResolver.registerContentObserver(Contacts.CONTENT_URI, true, mContentObserver);
}
@Override
public void run() {
if (!PermissionsUtil.checkAllPermissionsGranted(
mContext, Manifest.permission.READ_CONTACTS)) {
Log.i(TAG, "No permission to read contacts. Not updating the contacts.");
unregister();
return;
}
if (!mRunning.compareAndSet(false /* expect */, true /* update */)) {
if (DebugFlags.DEBUG_ENABLED) {
Log.d(TAG, "run() : Already running. Don't waste time checking again.");
}
return;
}
if (haveContentsChanged()) {
if (DebugFlags.DEBUG_ENABLED) {
Log.d(TAG, "run() : Contacts have changed. Notifying listeners.");
}
mContactsChangedListener.onContactsChange();
}
mRunning.set(false);
}
boolean haveContentsChanged() {
if (!PermissionsUtil.checkAllPermissionsGranted(
mContext, Manifest.permission.READ_CONTACTS)) {
Log.i(TAG, "No permission to read contacts. Marking contacts as not changed.");
return false;
}
final long startTime = SystemClock.uptimeMillis();
final int contactCount = mManager.getContactCount();
if (contactCount > ContactsDictionaryConstants.MAX_CONTACTS_PROVIDER_QUERY_LIMIT) {
// If there are too many contacts then return false. In this rare case it is impossible
// to include all of them anyways and the cost of rebuilding the dictionary is too high.
// TODO: Sort and check only the most recent contacts?
return false;
}
if (contactCount != mManager.getContactCountAtLastRebuild()) {
if (DebugFlags.DEBUG_ENABLED) {
Log.d(TAG, "haveContentsChanged() : Count changed from "
+ mManager.getContactCountAtLastRebuild() + " to " + contactCount);
}
return true;
}
final ArrayList<String> names = mManager.getValidNames(Contacts.CONTENT_URI);
if (names.hashCode() != mManager.getHashCodeAtLastRebuild()) {
return true;
}
if (DebugFlags.DEBUG_ENABLED) {
Log.d(TAG, "haveContentsChanged() : No change detected in "
+ (SystemClock.uptimeMillis() - startTime) + " ms)");
}
return false;
}
public void unregister() {
mContext.getContentResolver().unregisterContentObserver(mContentObserver);
}
}
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