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