;;;
  Copyright ( c ) 2015 ,   <  >
;;; All rights reserved.
;;; 
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions are met:
;;; 
;;;     * Redistributions of source code must retain the above copyright
;;;       notice, this list of conditions and the following disclaimer.
;;;     * Redistributions in binary form must reproduce the above copyright
;;;       notice, this list of conditions and the following disclaimer in the
;;;       documentation and/or other materials provided with the distribution.
      * Neither the name of Universität Bremen , Germany , nor the names of its
;;;       contributors may be used to endorse or promote products derived from
;;;       this software without specific prior written permission.
;;; 
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS " AS IS "
;;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED . IN NO EVENT SHALL THE COPYRIGHT OWNER OR  
  LIABLE FOR ANY DIRECT , INDIRECT , INCIDENTAL , SPECIAL , EXEMPLARY , OR
;;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION ) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY , WHETHER IN
;;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
;;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
;;; POSSIBILITY OF SUCH DAMAGE.
;;;

(in-package :desig)

;;;
  CRAM resolves human designators in the same way it resolves object designators :
;;;                          Through perception routines.
;;;
;;; As a result, there are no generator functions to produce hypothetical solutions
;;; for human designators in this package. Instead, perception routines have to set
;;; the `data' slot of a human designator which they were asked to perceive. In line
;;; with this thinking, the default implementation of `resolve-designator' for human
;;; designators throws an error.
;;;
;;; When calling `reference' on an unresolved human designator will throw an error
;;; because we consider it an error to reference the low-level data slot associated
;;; with an unperceived human.
;;;

(defclass human-designator (designator designator-id-mixin equate-notification-mixin)
  ())

(register-designator-class human human-designator)

(defmethod reference ((desig human-designator) &optional (role *default-role*))
  "References the human-designators `desig'. If its data-slot is nil, i.e. `desig'
 is an unresolved designator, `reference' will call `resolve-designator' on `desig'."
  (with-slots (data) desig
    (or data (setf data (resolve-designator desig role)))))

(defmethod resolve-designator ((desig human-designator) (role t))
  "Tries to resolve the human designator `desig'. As CRAM resolves human designators
 through external perception routines, this behavior is considered faulty. Hence, an
 error is thrown."
  (error 'designator-error
         :format-control "Designator `~a' does not reference an human."
         :format-arguments (list desig)
         :designator desig))

 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
     * Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
       contributors may be used to endorse or promote products derived from
       this software without specific prior written permission.
 
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.


                          Through perception routines.

 As a result, there are no generator functions to produce hypothetical solutions
 for human designators in this package. Instead, perception routines have to set
 the `data' slot of a human designator which they were asked to perceive. In line
 with this thinking, the default implementation of `resolve-designator' for human
 designators throws an error.

 When calling `reference' on an unresolved human designator will throw an error
 because we consider it an error to reference the low-level data slot associated
 with an unperceived human.

  Copyright ( c ) 2015 ,   <  >
      * Neither the name of Universität Bremen , Germany , nor the names of its
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS " AS IS "
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED . IN NO EVENT SHALL THE COPYRIGHT OWNER OR  
  LIABLE FOR ANY DIRECT , INDIRECT , INCIDENTAL , SPECIAL , EXEMPLARY , OR
  INTERRUPTION ) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY , WHETHER IN

(in-package :desig)

  CRAM resolves human designators in the same way it resolves object designators :

(defclass human-designator (designator designator-id-mixin equate-notification-mixin)
  ())

(register-designator-class human human-designator)

(defmethod reference ((desig human-designator) &optional (role *default-role*))
  "References the human-designators `desig'. If its data-slot is nil, i.e. `desig'
 is an unresolved designator, `reference' will call `resolve-designator' on `desig'."
  (with-slots (data) desig
    (or data (setf data (resolve-designator desig role)))))

(defmethod resolve-designator ((desig human-designator) (role t))
  "Tries to resolve the human designator `desig'. As CRAM resolves human designators
 through external perception routines, this behavior is considered faulty. Hence, an
 error is thrown."
  (error 'designator-error
         :format-control "Designator `~a' does not reference an human."
         :format-arguments (list desig)
         :designator desig))