-- Copyright (c) 2003-2007 ETH Zurich, Switzerland
--                    2016 The University of Sheffield, UK
-- 
-- All rights reserved.
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-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
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-- * Redistributions of source code must retain the above copyright notice, this
--   list of conditions and the following disclaimer.
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-- * Redistributions in binary form must reproduce the above copyright notice,
--   this list of conditions and the following disclaimer in the documentation
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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-- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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-- SPDX-License-Identifier: BSD-2-Clause
--

package ConcreteSimpleChair02

  context Person
    inv:  name <> ''

  context Session
    inv onlyOneChair: 
        self.roles->one( r:Role| r.oclIsTypeOf(ConcreteSimpleChair02.Chair))

 context Session::invite(p:Person,r:Role):OclVoid
    pre:  not self.participants->includes(p)
    post:     self.participants = self.participants@pre->append(p)
          and self.roles = self.roles@pre->append(r)

  context Session::findRole(p:Person):Role
    pre:  self.participants->includes(p)
--    post: result = roles->at(participants->indexOf(p))

  context Session
    inv: participants.size() = roles.size()

  context Session 
    inv:  self.roles->forAll(r:Role | r.sessions->includes(self))

  context Role
    inv:  self.sessions->forAll(s:Session | s.roles->includes(self))

  context Session
    inv:  self.participants->forAll(p:Person | p.sessions->includes(self))
   context Person
     inv:  self.sessions->forAll(s:Session | s.participants->includes(self))

endpackage