from ..messenger import Messenger

class Executor(object):
    '''
    Abstract base class for commands that process directives.
    '''

    def __init__(self, base_directory):
        self._base_directory = base_directory
        self._log = Messenger()

    def can_handle(self, directive):
        '''
        Returns true if the Executor can handle the directive.
        '''
        raise NotImplementedError

    def handle(self, directive, data):
        '''
        Executes the directive.

        Returns true if the Executor successfully handled the directive.
        '''
        raise NotImplementedError