AToMPM/mt/ptcal/pytcore/rules/sequence.py

'''This file is part of AToMPM - A Tool for Multi-Paradigm Modelling
Copyright 2011 by the AToMPM team and licensed under the LGPL
See COPYING.lesser and README.md in the root of this project for full details'''

from ..tcore.composer import Composer


class Sequence(Composer):
    '''
        Applies each rule in the order provided.
    '''
    def __init__(self, rules):
        '''
            Applies each rule in the order provided.
            @param rules: The rules to apply.
        '''
        super(Sequence, self).__init__()
        self.rules = rules
    
    def packet_in(self, packet):
        self.exception = None
        self.is_success = False
        for rule in self.rules:
            packet = rule.packet_in(packet)
            packet.clean()
            if not rule.is_success:
                if rule.exception is not None:
                    self.exception = rule.exception
                return packet
        self.is_success = True
        return packet