Benson Huang | a8b6afc | 2014-11-20 15:42:26 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 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.android.fmradio; |
| 18 | |
| 19 | import android.content.ContentProvider; |
| 20 | import android.content.ContentUris; |
| 21 | import android.content.ContentValues; |
| 22 | import android.content.Context; |
| 23 | import android.content.UriMatcher; |
| 24 | import android.database.Cursor; |
| 25 | import android.database.sqlite.SQLiteDatabase; |
| 26 | import android.database.sqlite.SQLiteOpenHelper; |
| 27 | import android.database.sqlite.SQLiteQueryBuilder; |
| 28 | import android.net.Uri; |
| 29 | import android.text.TextUtils; |
| 30 | import android.util.Log; |
| 31 | |
| 32 | /** |
| 33 | * This class provider interface to operator FM database table StationList |
| 34 | */ |
| 35 | public class FmProvider extends ContentProvider { |
| 36 | private static final String TAG = "FmProvider"; |
| 37 | |
| 38 | // database instance use to operate the database |
| 39 | private SQLiteDatabase mSqlDb = null; |
| 40 | // database helper use to get database instance |
| 41 | private DatabaseHelper mDbHelper = null; |
| 42 | // database name |
| 43 | private static final String DATABASE_NAME = "FmRadio.db"; |
| 44 | // database version |
| 45 | private static final int DATABASE_VERSION = 1; |
| 46 | // table name |
| 47 | private static final String TABLE_NAME = "StationList"; |
| 48 | |
| 49 | // URI match code |
| 50 | private static final int STATION_FREQ = 1; |
| 51 | // URI match code |
| 52 | private static final int STATION_FREQ_ID = 2; |
| 53 | // use to match URI |
| 54 | private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH); |
| 55 | |
| 56 | // match URI with station frequency or station frequency id |
| 57 | static { |
| 58 | URI_MATCHER.addURI(FmStation.AUTHORITY, FmStation.STATION, STATION_FREQ); |
| 59 | URI_MATCHER.addURI(FmStation.AUTHORITY, FmStation.STATION + "/#", |
| 60 | STATION_FREQ_ID); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Helper to operate database |
| 65 | */ |
| 66 | private static class DatabaseHelper extends SQLiteOpenHelper { |
| 67 | |
| 68 | /** |
| 69 | * initial database name and database version |
| 70 | * |
| 71 | * @param context application context |
| 72 | */ |
| 73 | DatabaseHelper(Context context) { |
| 74 | super(context, DATABASE_NAME, null, DATABASE_VERSION); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Create database table |
| 79 | * |
| 80 | * @param db The database |
| 81 | */ |
| 82 | @Override |
| 83 | public void onCreate(SQLiteDatabase db) { |
| 84 | // Create the table |
| 85 | Log.d(TAG, "onCreate, create the database"); |
| 86 | db.execSQL( |
| 87 | "CREATE TABLE " + TABLE_NAME + "(" |
| 88 | + FmStation.Station._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," |
| 89 | + FmStation.Station.FREQUENCY + " INTEGER UNIQUE," |
| 90 | + FmStation.Station.IS_FAVORITE + " INTEGER DEFAULT 0," |
| 91 | + FmStation.Station.STATION_NAME + " TEXT," |
| 92 | + FmStation.Station.PROGRAM_SERVICE + " TEXT," |
| 93 | + FmStation.Station.RADIO_TEXT + " TEXT" |
| 94 | + ");" |
| 95 | ); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Upgrade database |
| 100 | * |
| 101 | * @param db database |
| 102 | * @param oldVersion The old database version |
| 103 | * @param newVersion The new database version |
| 104 | */ |
| 105 | @Override |
| 106 | public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { |
| 107 | // TODO: reimplement this when dB version changes |
| 108 | Log.i(TAG, "onUpgrade, upgrading database from version " + oldVersion + " to " |
| 109 | + newVersion + ", which will destroy all old data"); |
| 110 | db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); |
| 111 | onCreate(db); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Delete database table rows with condition |
| 117 | * |
| 118 | * @param uri The uri to delete |
| 119 | * @param selection The where cause to apply, if null will delete all rows |
| 120 | * @param selectionArgs The select value |
| 121 | * |
| 122 | * @return The rows number has be deleted |
| 123 | */ |
| 124 | @Override |
| 125 | public int delete(Uri uri, String selection, String[] selectionArgs) { |
| 126 | int rows = 0; |
| 127 | mSqlDb = mDbHelper.getWritableDatabase(); |
| 128 | switch (URI_MATCHER.match(uri)) { |
| 129 | case STATION_FREQ: |
| 130 | rows = mSqlDb.delete(TABLE_NAME, selection, selectionArgs); |
| 131 | getContext().getContentResolver().notifyChange(uri, null); |
| 132 | break; |
| 133 | |
| 134 | case STATION_FREQ_ID: |
| 135 | String stationID = uri.getPathSegments().get(1); |
| 136 | rows = mSqlDb.delete(TABLE_NAME, |
| 137 | FmStation.Station._ID |
| 138 | + "=" |
| 139 | + stationID |
| 140 | + (TextUtils.isEmpty(selection) ? "" : " AND (" + selection + ")"), |
| 141 | selectionArgs); |
| 142 | getContext().getContentResolver().notifyChange(uri, null); |
| 143 | break; |
| 144 | |
| 145 | default: |
| 146 | Log.e(TAG, "delete, unkown URI to delete: " + uri); |
| 147 | break; |
| 148 | } |
| 149 | return rows; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Insert values to database with uri |
| 154 | * |
| 155 | * @param uri The insert uri |
| 156 | * @param values The insert values |
| 157 | * |
| 158 | * @return The uri after inserted |
| 159 | */ |
| 160 | @Override |
| 161 | public Uri insert(Uri uri, ContentValues values) { |
| 162 | Uri rowUri = null; |
| 163 | mSqlDb = mDbHelper.getWritableDatabase(); |
| 164 | ContentValues v = new ContentValues(values); |
| 165 | |
| 166 | long rowId = mSqlDb.insert(TABLE_NAME, null, v); |
| 167 | if (rowId <= 0) { |
| 168 | Log.e(TAG, "insert, failed to insert row into " + uri); |
| 169 | } |
| 170 | rowUri = ContentUris.appendId(FmStation.Station.CONTENT_URI.buildUpon(), rowId) |
| 171 | .build(); |
| 172 | getContext().getContentResolver().notifyChange(rowUri, null); |
| 173 | return rowUri; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Create database helper |
| 178 | * |
| 179 | * @return true if create database helper success |
| 180 | */ |
| 181 | @Override |
| 182 | public boolean onCreate() { |
| 183 | mDbHelper = new DatabaseHelper(getContext()); |
| 184 | return (null == mDbHelper) ? false : true; |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Query the database with current settings and add information |
| 189 | * |
| 190 | * @param uri The database uri |
| 191 | * @param projection The columns need to query |
| 192 | * @param selection The where clause |
| 193 | * @param selectionArgs The where value |
| 194 | * @param sortOrder The column to sort |
| 195 | * |
| 196 | * @return The query result cursor |
| 197 | */ |
| 198 | @Override |
| 199 | public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, |
| 200 | String sortOrder) { |
| 201 | SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); |
| 202 | SQLiteDatabase db = mDbHelper.getReadableDatabase(); |
| 203 | qb.setTables(TABLE_NAME); |
| 204 | |
| 205 | int match = URI_MATCHER.match(uri); |
| 206 | |
| 207 | if (STATION_FREQ_ID == match) { |
| 208 | qb.appendWhere("_id = " + uri.getPathSegments().get(1)); |
| 209 | } |
| 210 | |
| 211 | Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder); |
| 212 | if (null != c) { |
| 213 | c.setNotificationUri(getContext().getContentResolver(), uri); |
| 214 | } |
| 215 | return c; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Update the database content use content values with current settings and |
| 220 | * add information |
| 221 | * |
| 222 | * @param uri The database uri |
| 223 | * @param values The values need to update |
| 224 | * @param selection The where clause |
| 225 | * @param selectionArgs The where value |
| 226 | * |
| 227 | * @return The row numbers have changed |
| 228 | */ |
| 229 | @Override |
| 230 | public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { |
| 231 | int rows = 0; |
| 232 | mSqlDb = mDbHelper.getWritableDatabase(); |
| 233 | switch (URI_MATCHER.match(uri)) { |
| 234 | case STATION_FREQ: |
| 235 | rows = mSqlDb.update(TABLE_NAME, values, selection, selectionArgs); |
| 236 | getContext().getContentResolver().notifyChange(uri, null); |
| 237 | break; |
| 238 | case STATION_FREQ_ID: |
| 239 | String stationID = uri.getPathSegments().get(1); |
| 240 | rows = mSqlDb.update(TABLE_NAME, |
| 241 | values, |
| 242 | FmStation.Station._ID |
| 243 | + "=" |
| 244 | + stationID |
| 245 | + (TextUtils.isEmpty(selection) ? "" : " AND (" + selection + ")"), |
| 246 | selectionArgs); |
| 247 | getContext().getContentResolver().notifyChange(uri, null); |
| 248 | break; |
| 249 | default: |
| 250 | Log.e(TAG, "update, unkown URI to update: " + uri); |
| 251 | break; |
| 252 | } |
| 253 | return rows; |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Get uri type |
| 258 | * |
| 259 | * @param uri The the uri |
| 260 | * |
| 261 | * @return The type |
| 262 | */ |
| 263 | @Override |
| 264 | public String getType(Uri uri) { |
| 265 | return null; |
| 266 | } |
| 267 | } |