<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ParseFileEntry(self, parser_mediator, file_entry):
 """Parses a SQLite database file entry. Args: parser_mediator (ParserMediator):
 parser mediator. file_entry (dfvfs.FileEntry):
 file entry to be parsed. Raises: UnableToParseFile: when the file cannot be parsed. """

    filename = parser_mediator.GetFilename()
    database = SQLiteDatabase(
        filename, temporary_directory=parser_mediator.temporary_directory)

    file_object = file_entry.GetFileObject()
    try:
      database.Open(file_object)

    except (IOError, ValueError, sqlite3.DatabaseError) as exception:
      parser_mediator.ProduceExtractionWarning(
          'unable to open SQLite database with error: {0!s}'.format(exception))
      file_object.close()
      return

    database_wal, wal_file_entry = self._OpenDatabaseWithWAL(
        parser_mediator, file_entry, file_object, filename)

    file_object.close()

    # Create a cache in which the resulting tables are cached.
    cache = SQLiteCache()
    try:
      table_names = frozenset(database.tables)

      for plugin in self._plugins:
        if not plugin.REQUIRED_TABLES.issubset(table_names):
          continue

        schema_match = plugin.CheckSchema(database)
        if plugin.REQUIRES_SCHEMA_MATCH and not schema_match:
          parser_mediator.ProduceExtractionWarning((
              'plugin: {0:s} found required tables but not a matching '
              'schema').format(plugin.NAME))
          continue

        parser_mediator.SetFileEntry(file_entry)
        parser_mediator.AddEventAttribute('schema_match', schema_match)

        try:
          plugin.UpdateChainAndProcess(
              parser_mediator, cache=cache, database=database,
              database_wal=database_wal, wal_file_entry=wal_file_entry)

        except Exception as exception:  # pylint: disable=broad-except
          parser_mediator.ProduceExtractionWarning((
              'plugin: {0:s} unable to parse SQLite database with error: '
              '{1!s}').format(plugin.NAME, exception))

        finally:
          parser_mediator.RemoveEventAttribute('schema_match')

        if not database_wal:
          continue

        schema_match = plugin.CheckSchema(database)

        parser_mediator.SetFileEntry(wal_file_entry)
        parser_mediator.AddEventAttribute('schema_match', schema_match)

        try:
          plugin.UpdateChainAndProcess(
              parser_mediator, cache=cache, database=database,
              database_wal=database_wal, wal_file_entry=wal_file_entry)

        except Exception as exception:  # pylint: disable=broad-except
          parser_mediator.ProduceExtractionWarning((
              'plugin: {0:s} unable to parse SQLite database and WAL with '
              'error: {1!s}').format(plugin.NAME, exception))

        finally:
          parser_mediator.RemoveEventAttribute('schema_match')

    finally:
      database.Close()