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1 -- F393B00.A
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2 -- Alert_Foundation
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3 --
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4 -- Grant of Unlimited Rights
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5 --
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6 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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7 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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8 -- unlimited rights in the software and documentation contained herein.
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9 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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10 -- this public release, the Government intends to confer upon all
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11 -- recipients unlimited rights equal to those held by the Government.
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12 -- These rights include rights to use, duplicate, release or disclose the
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13 -- released technical data and computer software in whole or in part, in
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14 -- any manner and for any purpose whatsoever, and to have or permit others
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15 -- to do so.
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16 --
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17 -- DISCLAIMER
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18 --
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19 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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20 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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21 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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22 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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23 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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24 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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25 --*
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26 --
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27 -- FOUNDATION DESCRIPTION:
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28 -- This package declares three abstract types for use in C660 series
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29 -- tests, Alert, Special_Alert, and Private_Alert.
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30 -- It models (in miniature) an application situation in which an
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31 -- abstraction is defined in terms of structure (record and operations
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32 -- on the record) but not in terms of content (record is null). It
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33 -- also models a situation in which an abstraction includes some
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34 -- specific, implementation dependent, information.
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35 --
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36 -- CHANGE HISTORY:
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37 -- 06 Dec 94 SAIC ACVC 2.0
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38 --
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39 --!
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40
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41 package F393B00 is
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42 type Alert is abstract tagged null record; -- abstract type
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43 -- see procedure Handle below
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44
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45 procedure Handle (A : in out Alert) is abstract;
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46 -- abstract procedure,
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47 -- explicitly declared
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48
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49
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50 type Private_Alert is abstract tagged private;
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51
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52 procedure Handle (PA : in out Private_Alert) is abstract;
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53 -- ensures that Private_Alert
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54 -- is visibly abstract
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55
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56
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57 type Status_Kind is (Practice, Real, Dont_Care);
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58 type Urgency_Kind is (Low, Medium, High);
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59
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60 type Practice_Alert is new Alert with record
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61 Status : Status_Kind := Dont_Care;
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62 Urgency : Urgency_Kind := Low;
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63 end record;
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64
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65 procedure Handle (PA : in out Practice_Alert);
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66 -- overrides inherited Handle
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67
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68
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69
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70 type Device is (Teletype, Console, Big_Screen);
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71
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72 type Special_Alert (Age : Integer) is
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73 abstract new Practice_Alert with record
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74 Display : Device;
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75 end record;
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76
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77 procedure Handle (SA : in out Special_Alert) is abstract;
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78 -- overrides inherited Handle
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79
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80 private
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81 subtype Implementation_Detail is Integer range 1..10;
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82
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83 type Private_Alert is abstract tagged record
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84 Private_Field : Implementation_Detail := 1;
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85 end record;
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86
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87
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88 end F393B00;
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89
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90 --=======================================================================--
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91
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92 package body F393B00 is
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93
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94 procedure Handle (PA : in out Practice_Alert) is
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95 begin
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96 PA.Status := Real;
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97 PA.Urgency := Medium;
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98 end Handle;
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99
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100 end F393B00;
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101
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