class IndustryLocationChecks(object):
    """class to hold location checks for an industry"""
    def __init__(self, **kwargs):
        self.incompatible = kwargs.get('incompatible', {})

    def get_render_tree(self, switch_prefix):
        result = []
        for industry_type, distance in self.incompatible.items():
            result.append(LocationCheckIncompatible(industry_type, distance))

        prev = None
        for lc in reversed(result):
            if prev is not None:
                lc.switch_result = prev.industry_type
            prev = lc

        return result



class LocationCheckIncompatible(object):
    def __init__(self, industry_type, distance):
        self.industry_type = industry_type
        self.distance = distance
        self.switch_result = 'CB_RESULT_LOCATION_ALLOW' # default result, value may also be id for next switch