115 lines
4.4 KiB
Java
115 lines
4.4 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.database.ContentObserver;
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import android.os.SystemClock;
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import android.provider.ContactsContract.Contacts;
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import android.util.Log;
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import com.android.inputmethod.latin.ContactsManager.ContactsChangedListener;
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import com.android.inputmethod.latin.define.DebugFlags;
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import com.android.inputmethod.latin.utils.ExecutorUtils;
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import java.util.ArrayList;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* A content observer that listens to updates to content provider {@link Contacts#CONTENT_URI}.
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*/
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public class ContactsContentObserver implements Runnable {
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private static final String TAG = "ContactsContentObserver";
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private static AtomicBoolean sRunning = new AtomicBoolean(false);
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private final Context mContext;
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private final ContactsManager mManager;
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private ContentObserver mContentObserver;
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private ContactsChangedListener mContactsChangedListener;
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public ContactsContentObserver(final ContactsManager manager, final Context context) {
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mManager = manager;
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mContext = context;
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}
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public void registerObserver(final ContactsChangedListener listener) {
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if (DebugFlags.DEBUG_ENABLED) {
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Log.d(TAG, "registerObserver()");
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}
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mContactsChangedListener = listener;
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mContentObserver = new ContentObserver(null /* handler */) {
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@Override
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public void onChange(boolean self) {
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ExecutorUtils.getBackgroundExecutor(ExecutorUtils.KEYBOARD)
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.execute(ContactsContentObserver.this);
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}
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};
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final ContentResolver contentResolver = mContext.getContentResolver();
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contentResolver.registerContentObserver(Contacts.CONTENT_URI, true, mContentObserver);
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}
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@Override
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public void run() {
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if (!sRunning.compareAndSet(false /* expect */, true /* update */)) {
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if (DebugFlags.DEBUG_ENABLED) {
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Log.d(TAG, "run() : Already running. Don't waste time checking again.");
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}
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return;
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}
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if (haveContentsChanged()) {
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if (DebugFlags.DEBUG_ENABLED) {
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Log.d(TAG, "run() : Contacts have changed. Notifying listeners.");
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}
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mContactsChangedListener.onContactsChange();
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}
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sRunning.set(false);
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}
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boolean haveContentsChanged() {
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final long startTime = SystemClock.uptimeMillis();
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final int contactCount = mManager.getContactCount();
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if (contactCount > ContactsDictionaryConstants.MAX_CONTACTS_PROVIDER_QUERY_LIMIT) {
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// If there are too many contacts then return false. In this rare case it is impossible
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// to include all of them anyways and the cost of rebuilding the dictionary is too high.
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// TODO: Sort and check only the most recent contacts?
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return false;
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}
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if (contactCount != mManager.getContactCountAtLastRebuild()) {
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if (DebugFlags.DEBUG_ENABLED) {
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Log.d(TAG, "haveContentsChanged() : Count changed from "
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+ mManager.getContactCountAtLastRebuild() + " to " + contactCount);
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}
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return true;
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}
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final ArrayList<String> names = mManager.getValidNames(Contacts.CONTENT_URI);
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if (names.hashCode() != mManager.getHashCodeAtLastRebuild()) {
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return true;
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}
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if (DebugFlags.DEBUG_ENABLED) {
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Log.d(TAG, "haveContentsChanged() : No change detected in "
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+ (SystemClock.uptimeMillis() - startTime) + " ms)");
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}
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return false;
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}
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public void unregister() {
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mContext.getContentResolver().unregisterContentObserver(mContentObserver);
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}
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}
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