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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 com.android.inputmethod.latin;
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 com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.ContactsManager.ContactsChangedListener;
import com.android.inputmethod.latin.utils.ExecutorUtils;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
/**
* A content observer that listens to updates to content provider {@link Contacts.CONTENT_URI}.
*/
// TODO:add test
public class ContactsContentObserver {
private static final String TAG = ContactsContentObserver.class.getSimpleName();
private static final boolean DEBUG = false;
private ContentObserver mObserver;
private final Context mContext;
private final ContactsManager mManager;
public ContactsContentObserver(final ContactsManager manager, final Context context) {
mManager = manager;
mContext = context;
}
public void registerObserver(final ContactsChangedListener listener) {
if (DEBUG) {
Log.d(TAG, "Registered Contacts Content Observer");
}
mObserver = new ContentObserver(null /* handler */) {
@Override
public void onChange(boolean self) {
getBgExecutor().execute(new Runnable() {
@Override
public void run() {
if (haveContentsChanged()) {
if (DEBUG) {
Log.d(TAG, "Contacts have changed; notifying listeners");
}
listener.onContactsChange();
}
}
});
}
};
final ContentResolver contentResolver = mContext.getContentResolver();
contentResolver.registerContentObserver(Contacts.CONTENT_URI, true, mObserver);
}
@UsedForTesting
private ExecutorService getBgExecutor() {
return ExecutorUtils.getExecutor("Check Contacts");
}
private boolean haveContentsChanged() {
final long startTime = SystemClock.uptimeMillis();
final int contactCount = mManager.getContactCount();
if (contactCount > ContactsDictionaryConstants.MAX_CONTACT_COUNT) {
// 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 MAX_CONTACT_COUNT most recent contacts?
return false;
}
if (contactCount != mManager.getContactCountAtLastRebuild()) {
if (DEBUG) {
Log.d(TAG, "Contact count changed: " + mManager.getContactCountAtLastRebuild()
+ " to " + contactCount);
}
return true;
}
final ArrayList<String> names = mManager.getValidNames(Contacts.CONTENT_URI);
if (names.hashCode() != mManager.getHashCodeAtLastRebuild()) {
return true;
}
if (DEBUG) {
Log.d(TAG, "No contacts changed. (runtime = " + (SystemClock.uptimeMillis() - startTime)
+ " ms)");
}
return false;
}
public void unregister() {
mContext.getContentResolver().unregisterContentObserver(mObserver);
}
}