| /* |
| * Copyright (C) 2014 Google Inc. All Rights Reserved. |
| * |
| * 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.example.android.wearable.speedtracker; |
| |
| import com.example.android.wearable.speedtracker.common.LocationEntry; |
| import com.example.android.wearable.speedtracker.common.Utils; |
| import com.example.android.wearable.speedtracker.db.LocationDbHelper; |
| |
| import java.util.ArrayList; |
| import java.util.Calendar; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * A class that wraps database access and provides a cache for various GPS data. |
| */ |
| public class LocationDataManager { |
| |
| private final Map<String, List<LocationEntry>> mPointsMap = |
| new HashMap<String, List<LocationEntry>>(); |
| |
| private LocationDbHelper mDbHelper; |
| |
| public LocationDataManager(LocationDbHelper dbHelper) { |
| mDbHelper = dbHelper; |
| } |
| |
| /** |
| * Returns a list of {@link com.example.android.wearable.speedtracker.common.LocationEntry} |
| * objects for the day that the {@link java.util.Calendar} object points at. Internally it uses |
| * a cache to speed up subsequent calls. If there is no cached value, it gets the result from |
| * the database. |
| */ |
| public final List<LocationEntry> getPoints(Calendar calendar) { |
| String day = Utils.getHashedDay(calendar); |
| synchronized (mPointsMap) { |
| if (mPointsMap.get(day) == null) { |
| // there is no cache for this day, so lets get it from DB |
| List<LocationEntry> points = mDbHelper.read(calendar); |
| mPointsMap.put(day, points); |
| } |
| } |
| return mPointsMap.get(day); |
| } |
| |
| /** |
| * Clears the data for the day that the {@link java.util.Calendar} object falls on. This method |
| * removes the entries from the database and updates the cache accordingly. |
| */ |
| public final int clearPoints(Calendar calendar) { |
| synchronized (mPointsMap) { |
| String day = Utils.getHashedDay(calendar); |
| mPointsMap.remove(day); |
| return mDbHelper.delete(day); |
| } |
| } |
| |
| /** |
| * Adds a {@link com.example.android.wearable.speedtracker.common.LocationEntry} point to the |
| * database and cache if it is a new point. |
| */ |
| public final void addPoint(LocationEntry entry) { |
| synchronized (mPointsMap) { |
| List<LocationEntry> points = getPoints(entry.calendar); |
| if (points == null || points.isEmpty()) { |
| mDbHelper.insert(entry); |
| if (points == null) { |
| points = new ArrayList<LocationEntry>(); |
| } |
| points.add(entry); |
| mPointsMap.put(entry.day, points); |
| } else { |
| if (!points.contains(entry)) { |
| mDbHelper.insert(entry); |
| points.add(entry); |
| } |
| } |
| } |
| } |
| } |