note description: "Serialize and deserialize multiple objects into one file." legal: "See notice at end of class." status: "See notice at end of class." date: "$Date$" revision: "$Revision$" class SED_MULTI_OBJECT_SERIALIZATION inherit ANY SED_STORABLE_FACILITIES export {NONE} all end feature -- Access deserialized_object: ANY -- Last deserialized object last_file_position: INTEGER -- Position after last serialization error_message: STRING -- Reason for failure feature -- Status report successful: BOOLEAN -- Was last retrieval successful? feature -- Basic Operations deserialize (path: STRING; a_pos: INTEGER) -- Deserialize object previously serialized in `path' at position `a_pos'. require non_void_path: path /= Void valid_path: (create {RAW_FILE}.make (path)).exists local retried: BOOLEAN l_raw_file: RAW_FILE l_reader: SED_MEDIUM_READER_WRITER do if not retried then create l_raw_file.make_open_read (path) l_raw_file.go (a_pos) create l_reader.make (l_raw_file) l_reader.set_for_reading deserialized_object := retrieved (l_reader, True) successful := deserialized_object /= Void else successful := False end if l_raw_file /= Void and then not l_raw_file.is_closed then l_raw_file.close end ensure deserialized_object_set_if_no_error: successful implies deserialized_object /= Void rescue debug ("log_exceptions") log_last_exception end retried := True retry end feature -- Basic Operations serialize (a: ANY; path: STRING; is_appending: BOOLEAN) -- Serialize object `a' at the end of file `path' if `is_appending', otherwise -- reset content of `path'. -- Set `last_file_position' after storing. require non_void_object: a /= Void non_void_path: path /= Void local l_raw_file: RAW_FILE l_writer: SED_MEDIUM_READER_WRITER retried: BOOLEAN do if not retried then if is_appending then create l_raw_file.make_open_append (path) else create l_raw_file.make_open_write (path) end create l_writer.make (l_raw_file) l_writer.set_for_writing independent_store (a, l_writer, False) last_file_position := l_raw_file.count successful := True else successful := False error_message := "Cannot store into " + path end if l_raw_file /= Void and then not l_raw_file.is_closed then l_raw_file.close end rescue debug ("log_exceptions") log_last_exception end retried := True retry end feature {NONE} -- Logging log_last_exception -- Log last exception. do end note library: "EiffelBase: Library of reusable components for Eiffel." copyright: "Copyright (c) 1984-2006, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 356 Storke Road, Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end