C:/work/RevealedSystems/EyeSpy-RS/eyespy/src/objects/logic/common/subjectInterface.py

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# Copyright (C) 2008-2009  Mark Hanegraaff
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import copy



## The subjectInterface class follows a generic observer/subject pattern
# In reality the networkMonitor class acts as the observer, delivering a copy of all
# packets to various listeners. These listeners include the "storageManage" and the "entityManager"

class subjectInterface: 
    def __init__(self):
        self._observers = []
        
    ## Add a new observer to the list. The observer is notifies by calling the
    # update method
    # @param observer Observer object
    def attach(self, observer):
        if not observer in self._observers:
            self._observers.append(observer)

    ## removed an observer from the list.
    def detach(self, observer):
        try:
            self._observers.remove(observer)
        except ValueError:
            pass
        
        
    # Notifies all Observers
    # @param header Raw DataLink header
    # @param data  Raw DataLink frame
    def notifyAll(self, header, data):
        for observer in self._observers:
            observer.update(header, data)

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