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The source code is released under:
MIT License
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package jwtc.chess; // w w w . ja va2 s. c o m import java.util.HashMap; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.content.Context; import android.content.UriMatcher; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.database.sqlite.SQLiteQueryBuilder; import android.net.Uri; import android.text.TextUtils; import android.util.Log; public class ChessPuzzleProvider extends ContentProvider { public static String AUTHORITY = "jwtc.android.chess.puzzle.ChessPuzzleProvider"; public static Uri CONTENT_URI_PUZZLES = Uri.parse("content://" + AUTHORITY + "/puzzles"); public static Uri CONTENT_URI_PRACTICES = Uri.parse("content://" + AUTHORITY + "/practices"); private static final String TAG = "ChessPuzzleProvider"; private static final String DATABASE_NAME = "chess_puzzles.db"; private static final int DATABASE_VERSION = 8; // 7.6 lessons private static final String GAMES_TABLE_NAME = "games"; private static HashMap<String, String> sGamesProjectionMap; protected static final int PUZZLES = 1; protected static final int PUZZLES_ID = 2; protected static final int PRACTICES = 3; protected static final int PRACTICES_ID = 4; protected static final int TYPE_PUZZLE = 1; protected static final int TYPE_PRACTICE = 2; protected static UriMatcher sUriMatcher; public static final String COL_ID = "_ID"; public static final String COL_PGN = "PGN"; public static final String COL_TYPE = "PUZZLE_TYPE"; public static final String[] COLUMNS = { COL_ID, COL_TYPE, COL_PGN }; public static final String DEFAULT_SORT_ORDER = "_ID ASC"; public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.jwtc.chesspuzzle"; public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.jwtc.chesspuzzle"; /** * This class helps open, create, and upgrade the database file. */ private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE " + GAMES_TABLE_NAME + " (" + COL_ID + " INTEGER PRIMARY KEY," + COL_TYPE + " INTEGER," + COL_PGN + " TEXT" + ");"); } public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { Log.w(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL("DROP TABLE IF EXISTS " + GAMES_TABLE_NAME); onCreate(db); } } private DatabaseHelper mOpenHelper; @Override public boolean onCreate() { mOpenHelper = new DatabaseHelper(getContext()); return true; } public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); switch (sUriMatcher.match(uri)) { case PUZZLES: qb.setTables(GAMES_TABLE_NAME); qb.setProjectionMap(sGamesProjectionMap); qb.appendWhere(COL_TYPE + "=" + TYPE_PUZZLE); break; case PUZZLES_ID: qb.setTables(GAMES_TABLE_NAME); qb.setProjectionMap(sGamesProjectionMap); qb.appendWhere(COL_ID + "=" + uri.getPathSegments().get(1)); break; case PRACTICES: qb.setTables(GAMES_TABLE_NAME); qb.setProjectionMap(sGamesProjectionMap); qb.appendWhere(COL_TYPE + "=" + TYPE_PRACTICE); break; case PRACTICES_ID: qb.setTables(GAMES_TABLE_NAME); qb.setProjectionMap(sGamesProjectionMap); qb.appendWhere(COL_ID + "=" + uri.getPathSegments().get(1)); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } // If no sort order is specified use the default String orderBy; if (TextUtils.isEmpty(sortOrder)) { orderBy = DEFAULT_SORT_ORDER; } else { orderBy = sortOrder; } // Get the database and run the query SQLiteDatabase db = mOpenHelper.getReadableDatabase(); Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, orderBy); // Tell the cursor what uri to watch, so it knows when its source data changes c.setNotificationUri(getContext().getContentResolver(), uri); return c; } @Override public String getType(Uri uri) { switch (sUriMatcher.match(uri)) { case PUZZLES: return CONTENT_TYPE; case PUZZLES_ID: return CONTENT_ITEM_TYPE; case PRACTICES: return CONTENT_TYPE; case PRACTICES_ID: return CONTENT_ITEM_TYPE; default: throw new IllegalArgumentException("Unknown URI " + uri); } } public Uri insert(Uri uri, ContentValues initialValues) { // Validate the requested uri int iType = sUriMatcher.match(uri); if (iType != PUZZLES && iType != PRACTICES) { throw new IllegalArgumentException("Unknown URI " + uri); } ContentValues values; if (initialValues != null) { values = new ContentValues(initialValues); } else { values = new ContentValues(); } Long now = Long.valueOf(System.currentTimeMillis()); if(iType == PUZZLES) values.put(COL_TYPE, TYPE_PUZZLE); else if(iType == PRACTICES) values.put(COL_TYPE, TYPE_PRACTICE); SQLiteDatabase db = mOpenHelper.getWritableDatabase(); long rowId = db.insert(GAMES_TABLE_NAME, null, values); if (rowId > 0) { Uri myUri; if(iType == PUZZLES) myUri = ContentUris.withAppendedId(CONTENT_URI_PUZZLES, rowId); else myUri = ContentUris.withAppendedId(CONTENT_URI_PRACTICES, rowId); getContext().getContentResolver().notifyChange(myUri, null); return myUri; } throw new SQLException("Failed to insert row into " + uri); } @Override public int delete(Uri uri, String where, String[] whereArgs) { SQLiteDatabase db = mOpenHelper.getWritableDatabase(); int count; switch (sUriMatcher.match(uri)) { case PUZZLES: count = db.delete(GAMES_TABLE_NAME, COL_TYPE + "=" + TYPE_PUZZLE + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; case PUZZLES_ID: String puzzleId = uri.getPathSegments().get(1); count = db.delete(GAMES_TABLE_NAME, COL_ID + "=" + puzzleId + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; case PRACTICES: count = db.delete(GAMES_TABLE_NAME, COL_TYPE + "=" + TYPE_PRACTICE + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; case PRACTICES_ID: String practiceId = uri.getPathSegments().get(1); count = db.delete(GAMES_TABLE_NAME, COL_ID + "=" + practiceId + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } @Override public int update(Uri uri, ContentValues values, String where, String[] whereArgs) { SQLiteDatabase db = mOpenHelper.getWritableDatabase(); int count; switch (sUriMatcher.match(uri)) { case PUZZLES_ID: case PRACTICES_ID: String gameId = uri.getPathSegments().get(1); count = db.update(GAMES_TABLE_NAME, values, COL_ID + "=" + gameId + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } static { sGamesProjectionMap = new HashMap<String, String>(); sGamesProjectionMap.put(COL_ID, COL_ID); sGamesProjectionMap.put(COL_TYPE, COL_TYPE); sGamesProjectionMap.put(COL_PGN, COL_PGN); sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH); sUriMatcher.addURI(AUTHORITY, "puzzles", PUZZLES); sUriMatcher.addURI(AUTHORITY, "puzzles/#", PUZZLES_ID); sUriMatcher.addURI(AUTHORITY, "practices", PRACTICES); sUriMatcher.addURI(AUTHORITY, "practices/#", PRACTICES_ID); } }