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111
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1 -- FA13A00.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- FOUNDATION DESCRIPTION:
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27 -- This foundation code is used to check visibility of separate
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28 -- subunit of child packages.
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29 -- Declares a package containing type definitions; package will be
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30 -- with'ed by the root of the elevator abstraction.
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31 --
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32 -- Declare an elevator abstraction in a parent root package which manages
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33 -- basic operations. This package has a private part. Declare a
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34 -- private child package which calculates the floors for going up or
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35 -- down. Declare a public child package which provides the actual
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36 -- operations.
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37 --
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38 -- CHANGE HISTORY:
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39 -- 06 Dec 94 SAIC ACVC 2.0
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40 --
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41 --!
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42
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43 -- Simulates a fragment of an elevator operation application.
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44
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45 package FA13A00_0 is -- Building Manager
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46
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47 type Electrical_Power is (Off, V120, V240);
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48 Power : Electrical_Power := V120;
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49
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50 -- other type definitions and procedure declarations in real application.
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51
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52 end FA13A00_0;
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53
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54 -- No bodies provided for FA13A00_0.
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55
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56 --==================================================================--
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57
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58 package FA13A00_1 is -- Basic Elevator Operations
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59
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60 type Call_Waiting_Type is private;
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61 type Floor is (Basement, Floor1, Floor2, Floor3, Penthouse);
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62 type Floor_No is range Floor'Pos(Floor'First) .. Floor'Pos(Floor'Last);
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63 Current_Floor : Floor := Floor1;
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64
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65 TC_Operation : boolean := true;
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66
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67 procedure Call (F : in Floor; C : in out Call_Waiting_Type);
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68 procedure Clear_Calls (C : in out Call_Waiting_Type);
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69
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70 private
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71 type Call_Waiting_Type is array (Floor) of boolean;
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72 Call_Waiting : Call_Waiting_Type := (others => false);
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73
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74 end FA13A00_1;
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75
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76
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77 --==================================================================--
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78
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79 package body FA13A00_1 is
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80
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81 -- Call the elevator.
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82
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83 procedure Call (F : in Floor; C : in out Call_Waiting_Type) is
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84 begin
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85 C (F) := true;
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86 end Call;
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87
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88 --------------------------------------------
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89
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90 -- Clear all calls of the elevator.
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91
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92 procedure Clear_Calls (C : in out Call_Waiting_Type) is
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93 begin
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94 C := (others => false);
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95 end Clear_Calls;
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96
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97 end FA13A00_1;
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98
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99 --==================================================================--
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100
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101 -- Private child package of an elevator application. This package calculates
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102 -- how many floors to go up or down.
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103
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104 private package FA13A00_1.FA13A00_2 is -- Floor Calculation
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105
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106 -- Other type definitions in real application.
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107
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108 procedure Up (HowMany : in Floor_No);
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109
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110 procedure Down (HowMany : in Floor_No);
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111
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112 end FA13A00_1.FA13A00_2;
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113
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114 --==================================================================--
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115
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116 package body FA13A00_1.FA13A00_2 is
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117
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118 -- Go up from the current floor.
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119
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120 procedure Up (HowMany : in Floor_No) is
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121 begin
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122 Current_Floor := Floor'val (Floor'pos (Current_Floor) + HowMany);
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123 end Up;
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124
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125 --------------------------------------------
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126
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127 -- Go down from the current floor.
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128
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129 procedure Down (HowMany : in Floor_No) is
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130 begin
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131 Current_Floor := Floor'val (Floor'pos (Current_Floor) - HowMany);
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132 end Down;
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133
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134 end FA13A00_1.FA13A00_2;
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135
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136 --==================================================================--
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137
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138 -- Public child package of an elevator application. This package provides
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139 -- the actual operation of the elevator.
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140
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141 package FA13A00_1.FA13A00_3 is -- Move Elevator
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142
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143 -- Other type definitions in real application.
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144
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145 procedure Move_Elevator (F : in Floor;
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146 C : in out Call_Waiting_Type);
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147
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148 end FA13A00_1.FA13A00_3;
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149
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150 --==================================================================--
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151
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152 with FA13A00_1.FA13A00_2; -- Floor Calculation
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153
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154 package body FA13A00_1.FA13A00_3 is
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155
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156 -- Going up or down depends on the current floor.
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157
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158 procedure Move_Elevator (F : in Floor;
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159 C : in out Call_Waiting_Type) is
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160 begin
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161 if F > Current_Floor then
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162 FA13A00_1.FA13A00_2.Up (Floor'Pos (F) - Floor'Pos (Current_Floor));
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163 FA13A00_1.Call (F, C);
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164 elsif F < Current_Floor then
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165 FA13A00_1.FA13A00_2.Down (Floor'Pos (Current_Floor) - Floor'Pos (F));
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166 FA13A00_1.Call (F, C);
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167 end if;
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168
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169 end Move_Elevator;
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170
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171 end FA13A00_1.FA13A00_3;
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