1 /* 2 * Copyright (C) 2014 Google Inc. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.wearable.speedtracker.db; 18 19 import android.content.ContentValues; 20 import android.content.Context; 21 import android.database.Cursor; 22 import android.database.sqlite.SQLiteDatabase; 23 import android.database.sqlite.SQLiteOpenHelper; 24 import android.provider.BaseColumns; 25 import android.util.Log; 26 27 import com.example.android.wearable.speedtracker.common.LocationEntry; 28 import com.example.android.wearable.speedtracker.common.Utils; 29 30 import java.util.ArrayList; 31 import java.util.Calendar; 32 import java.util.List; 33 34 /** 35 * A helper class to set up the database that holds the GPS location information 36 */ 37 public class LocationDbHelper extends SQLiteOpenHelper { 38 39 private static final String TAG = "LocationDbHelper"; 40 41 public static final String TABLE_NAME = "location"; 42 public static final String COLUMN_NAME_DAY = "day"; 43 public static final String COLUMN_NAME_LATITUDE = "lat"; 44 public static final String COLUMN_NAME_LONGITUDE = "lon"; 45 public static final String COLUMN_NAME_TIME = "time"; 46 47 private static final String TEXT_TYPE = " TEXT"; 48 private static final String INTEGER_TYPE = " INTEGER"; 49 private static final String REAL_TYPE = " REAL"; 50 private static final String COMMA_SEP = ","; 51 private static final String SQL_CREATE_ENTRIES = 52 "CREATE TABLE " + TABLE_NAME + " (" 53 + BaseColumns._ID + " INTEGER PRIMARY KEY," 54 + COLUMN_NAME_DAY + TEXT_TYPE + COMMA_SEP 55 + COLUMN_NAME_LATITUDE + REAL_TYPE + COMMA_SEP 56 + COLUMN_NAME_LONGITUDE + REAL_TYPE + COMMA_SEP 57 + COLUMN_NAME_TIME + INTEGER_TYPE 58 + " )"; 59 private static final String SQL_DELETE_ENTRIES = "DROP TABLE IF EXISTS " + TABLE_NAME; 60 61 public static final int DATABASE_VERSION = 1; 62 public static final String DATABASE_NAME = "Location.db"; 63 64 public LocationDbHelper(Context context) { 65 super(context, DATABASE_NAME, null, DATABASE_VERSION); 66 } 67 68 @Override 69 public void onCreate(SQLiteDatabase db) { 70 db.execSQL(SQL_CREATE_ENTRIES); 71 } 72 73 @Override 74 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 75 db.execSQL(SQL_DELETE_ENTRIES); 76 onCreate(db); 77 } 78 79 /** 80 * Inserts a {@link com.example.android.wearable.speedtracker.common.LocationEntry} item to the 81 * database. 82 */ 83 public final long insert(LocationEntry entry) { 84 if (Log.isLoggable(TAG, Log.DEBUG)) { 85 Log.d(TAG, "Inserting a LocationEntry"); 86 } 87 // Gets the data repository in write mode 88 SQLiteDatabase db = getWritableDatabase(); 89 90 // Create a new map of values, where column names are the keys 91 ContentValues values = new ContentValues(); 92 values.put(COLUMN_NAME_DAY, entry.day); 93 values.put(COLUMN_NAME_LONGITUDE, entry.longitude); 94 values.put(COLUMN_NAME_LATITUDE, entry.latitude); 95 values.put(COLUMN_NAME_TIME, entry.calendar.getTimeInMillis()); 96 97 // Insert the new row, returning the primary key value of the new row 98 return db.insert(TABLE_NAME, "null", values); 99 } 100 101 /** 102 * Returns a list of {@link com.example.android.wearable.speedtracker.common.LocationEntry} 103 * objects from the database for a given day. The list can be empty (but not {@code null}) if 104 * there are no such items. This method looks at the day that the calendar argument points at. 105 */ 106 public final List<LocationEntry> read(Calendar calendar) { 107 SQLiteDatabase db = getReadableDatabase(); 108 String[] projection = { 109 COLUMN_NAME_LONGITUDE, 110 COLUMN_NAME_LATITUDE, 111 COLUMN_NAME_TIME 112 }; 113 String day = Utils.getHashedDay(calendar); 114 115 // sort ASC based on the time of the entry 116 String sortOrder = COLUMN_NAME_TIME + " ASC"; 117 String selection = COLUMN_NAME_DAY + " LIKE ?"; 118 119 Cursor cursor = db.query( 120 TABLE_NAME, // The table to query 121 projection, // The columns to return 122 selection, // The columns for the WHERE clause 123 new String[]{day}, // The values for the WHERE clause 124 null, // don't group the rows 125 null, // don't filter by row groups 126 sortOrder // The sort order 127 ); 128 129 List<LocationEntry> result = new ArrayList<LocationEntry>(); 130 int count = cursor.getCount(); 131 if (count > 0) { 132 cursor.moveToFirst(); 133 while (!cursor.isAfterLast()) { 134 Calendar cal = Calendar.getInstance(); 135 cal.setTimeInMillis(cursor.getLong(2)); 136 LocationEntry entry = new LocationEntry(cal, cursor.getDouble(1), 137 cursor.getDouble(0)); 138 result.add(entry); 139 cursor.moveToNext(); 140 } 141 } 142 cursor.close(); 143 return result; 144 } 145 146 /** 147 * Deletes all the entries in the database for the given day. The argument {@code day} should 148 * match the format provided by {@link getHashedDay()} 149 */ 150 public final int delete(String day) { 151 SQLiteDatabase db = getWritableDatabase(); 152 // Define 'where' part of the query. 153 String selection = COLUMN_NAME_DAY + " LIKE ?"; 154 String[] selectionArgs = {day}; 155 return db.delete(TABLE_NAME, selection, selectionArgs); 156 } 157 158 /** 159 * Deletes all the entries in the database for the day that the {@link java.util.Calendar} 160 * argument points at. 161 */ 162 public final int delete(Calendar calendar) { 163 return delete(Utils.getHashedDay(calendar)); 164 } 165 } 166
