111 lines
4.1 KiB
Java
111 lines
4.1 KiB
Java
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/*
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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.annotations.UsedForTesting;
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import com.android.inputmethod.latin.ContactsManager.ContactsChangedListener;
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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.ExecutorService;
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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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// TODO:add test
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public class ContactsContentObserver {
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private static final String TAG = ContactsContentObserver.class.getSimpleName();
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private static final boolean DEBUG = false;
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private ContentObserver mObserver;
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private final Context mContext;
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private final ContactsManager mManager;
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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 (DEBUG) {
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Log.d(TAG, "Registered Contacts Content Observer");
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}
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mObserver = new ContentObserver(null /* handler */) {
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@Override
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public void onChange(boolean self) {
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getBgExecutor().execute(new Runnable() {
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@Override
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public void run() {
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if (haveContentsChanged()) {
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if (DEBUG) {
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Log.d(TAG, "Contacts have changed; notifying listeners");
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}
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listener.onContactsChange();
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}
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}
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});
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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, mObserver);
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}
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@UsedForTesting
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private ExecutorService getBgExecutor() {
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return ExecutorUtils.getExecutor("Check Contacts");
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}
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private 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_CONTACT_COUNT) {
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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 MAX_CONTACT_COUNT 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 (DEBUG) {
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Log.d(TAG, "Contact count changed: " + mManager.getContactCountAtLastRebuild()
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+ " 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 (DEBUG) {
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Log.d(TAG, "No contacts changed. (runtime = " + (SystemClock.uptimeMillis() - startTime)
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+ " 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(mObserver);
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}
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}
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