sPFFramework/src/main/java/it/polimi/spf/framework/security/ApplicationRegistry.java
public SPFPersona getPersonaOf(String appIdentifier) {
		SQLiteDatabase db = mRegistryTable.getReadableDatabase();
		String table = Contract.TABLE_NAME;
		String[] columns = { Contract.COLUMN_PERSONA };
		String selection = Contract.COLUMN_APP_IDENTIFIER + " = ? ";
		String[] selectionArgs = { appIdentifier };
		String groupBy = null;
		String having = null;
		String orderBy = null;
		Cursor c = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy);
		if (c.moveToNext()) {
			String persona = c.getString(c.getColumnIndex(Contract.COLUMN_PERSONA));
			return new SPFPersona(persona);
		}

		c.close();
		return SPFPersona.DEFAULT;
	}
public SPFPersona getPersonaOf(String appIdentifier) {
		SQLiteDatabase db = mRegistryTable.getReadableDatabase();
		String table = Contract.TABLE_NAME;
		String[] columns = { Contract.COLUMN_PERSONA };
		String selection = Contract.COLUMN_APP_IDENTIFIER + " = ? ";
		String[] selectionArgs = { appIdentifier };
		String groupBy = null;
		String having = null;
		String orderBy = null;
		Cursor c = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy);
		if (c.moveToNext()) {
			String persona = c.getString(c.getColumnIndex(Contract.COLUMN_PERSONA));
			return new SPFPersona(persona);
		}

		c.close();
		return SPFPersona.DEFAULT;
	}
Returns the SPFPersona associated to the specified application. If the
application does not exist returns the default SPFPersona.

@param appIdentifier
- the identifier of the application
@return a SPFPersona