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1 -- CA11009.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 -- OBJECTIVE:
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27 -- Check that a private child package can use entities declared in the
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28 -- visible part of the parent unit of its parent unit.
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29 --
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30 -- TEST DESCRIPTION:
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31 -- Declare a parent package containing types and objects used by the
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32 -- system. Declare a public child package that provides a visible
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33 -- interface to the system functionality.
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34 -- Declare a private grandchild package that uses the visible grandparent
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35 -- components to provide the actual functionality to the system.
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36 --
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37 -- The public child (parent of the private grandchild) uses the
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38 -- functionality of its private child (grandchild package) to provide
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39 -- the visible interface to operations of the system.
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40 --
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41 -- The test itself will utilize the visible interface provided in the
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42 -- public child package to demonstrate a possible structure for
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43 -- file management.
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44 --
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45 --
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46 -- CHANGE HISTORY:
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47 -- 06 Dec 94 SAIC ACVC 2.0
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48 -- 15 Apr 96 SAIC ACVC 2.1: Added pragma Elaborate_body.
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49 --
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50 --!
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51
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52 package CA11009_0 is -- Package OS.
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53 pragma Elaborate_Body (CA11009_0);
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54
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55 type File_Descriptor_Type is new Integer;
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56 type File_Name_Type is new String (1 .. 11);
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57 type Permission_Type is (None, User, System, Bypass);
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58 type File_Mode_Type is (Read_Only, Write_Only, Read_Write);
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59 type File_Status_Type is (Open, Closed);
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60
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61 Default_Descriptor : constant File_Descriptor_Type := 0;
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62 Default_Permission : constant Permission_Type := None;
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63 Default_Mode : constant File_Mode_Type := Read_Only;
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64 Default_Status : constant File_Status_Type := Closed;
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65 Default_Filename : constant File_Name_Type := " ";
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66
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67 Max_Files : constant File_Descriptor_Type := 10;
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68 An_Ada_File_Name : constant File_Name_Type := "AdaFileName";
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69 File_Counter : Integer := 0;
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70
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71 type File_Type is tagged
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72 record
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73 Descriptor : File_Descriptor_Type := Default_Descriptor;
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74 Name : File_Name_Type := Default_Filename;
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75 Acct_Access : Permission_Type := Default_Permission;
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76 Mode : File_Mode_Type := Default_Mode;
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77 Current_Status : File_Status_Type := Default_Status;
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78 end record;
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79
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80 type File_Array_Type is array (1 .. Max_Files) of File_Type;
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81
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82 File_Table : File_Array_Type;
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83
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84 --
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85
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86 function Get_File_Name return File_Name_Type;
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87
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88 end CA11009_0; -- Package OS.
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89
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90 --=================================================================--
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91
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92 package body CA11009_0 is -- Package body OS.
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93
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94 function Get_File_Name return File_Name_Type is
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95 begin
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96 return (An_Ada_File_Name); -- Processing would be replace by a user
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97 -- prompt in a functioning system.
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98 end Get_File_Name;
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99
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100 end CA11009_0; -- Package body OS.
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101
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102 --=================================================================--
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103
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104 package CA11009_0.CA11009_1 is -- Child Package OS.File_Manager
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105
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106 -- This package simulates a visible interface for the Operating System.
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107 -- The actual processing performed by this routine is encapsulated
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108 -- in the routines of private child package Internals, which is "withed"
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109 -- by the body of this package.
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110
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111 procedure Create_File (Mode : in File_Mode_Type;
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112 File_Key : out File_Descriptor_Type);
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113
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114 end CA11009_0.CA11009_1; -- Child Package OS.File_Manager
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115
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116 --=================================================================--
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117
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118 -- Subprogram that performs the actual file operation is contained in a
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119 -- private package so that it is not accessible to any client, and can be
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120 -- modified/extended without requiring recompilation of the clients of the
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121 -- parent (since this package is "withed" by the parent body only.)
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122
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123
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124 -- Grandchild Package OS.File_Manager.Internals
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125 private package CA11009_0.CA11009_1.CA11009_2 is
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126
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127 Initial_Permission : constant Permission_Type := User; -- Grandparent
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128 Initial_Status : constant File_Status_Type := Open; -- literals.
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129 Initial_Filename : constant File_Name_Type := -- Grandparent type.
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130 Get_File_Name; -- Grandparent function.
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131
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132 function Create (Mode : File_Mode_Type)
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133 return File_Descriptor_Type; -- Grandparent type.
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134
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135 end CA11009_0.CA11009_1.CA11009_2;
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136 -- Grandchild Package OS.File_Manager.Internals
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137
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138 --=================================================================--
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139
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140 -- Grandchild Package body OS.File_Manager.Internals
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141 package body CA11009_0.CA11009_1.CA11009_2 is
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142
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143 function Next_Available_File return File_Descriptor_Type is
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144 begin
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145 File_Counter := File_Counter + 1; -- Grandparent object.
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146 return (File_Descriptor_Type(File_Counter));
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147 end Next_Available_File;
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148 -------------------------------------------------------------------------
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149 function Create (Mode : File_Mode_Type) -- Grandparent literal.
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150 return File_Descriptor_Type is
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151 Number : File_Descriptor_Type; -- Grandparent type.
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152 begin
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153 Number := Next_Available_File;
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154 File_Table(Number).Descriptor := Number; -- Grandparent object.
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155 File_Table(Number).Name := Initial_Filename;
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156 File_Table(Number).Mode := Mode; -- Parameter.
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157 File_Table(Number).Acct_Access := Initial_Permission;
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158 File_Table(Number).Current_Status := Initial_Status;
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159 return (Number);
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160 end Create;
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161
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162 end CA11009_0.CA11009_1.CA11009_2;
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163 -- Grandchild Package body OS.File_Manager.Internals
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164
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165 --=================================================================--
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166
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167 -- "With" of a child package
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168 -- by the parent body.
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169 with CA11009_0.CA11009_1.CA11009_2; -- Grandchild OS.File_Manager.Internals
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170
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171 package body CA11009_0.CA11009_1 is -- Child Package body OS.File_Manager
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172
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173 package Internal renames CA11009_0.CA11009_1.CA11009_2;
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174
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175 -- These subprograms utilize calls to subprograms contained in a private
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176 -- sibling to perform the actual processing.
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177
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178 procedure Create_File (Mode : in File_Mode_Type;
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179 File_Key : out File_Descriptor_Type) is
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180 begin
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181 File_Key := Internal.Create (Mode);
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182 end Create_File;
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183
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184 end CA11009_0.CA11009_1; -- Child Package body OS.File_Manager
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185
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186 --=================================================================--
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187
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188 with CA11009_0.CA11009_1; -- with Child Package OS.File_Manager
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189 with Report;
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190
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191 procedure CA11009 is
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192
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193 package OS renames CA11009_0;
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194 use OS;
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195 package File_Manager renames CA11009_0.CA11009_1;
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196
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197 Data_Base_File_Key : File_Descriptor_Type := Default_Descriptor;
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198 New_Mode : File_Mode_Type := Read_Write;
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199
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200 begin
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201
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202 -- This test indicates one approach to file management.
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203 -- It is not intended to demonstrate full functionality, but rather
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204 -- that the use of a private child package could provide a solution
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205 -- to this type of situation.
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206
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207 Report.Test ("CA11009", "Check that a private child package can use " &
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208 "entities declared in the visible part of the " &
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209 "parent unit of its parent unit");
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210
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211 -- Check initial conditions of the first entry in the file table.
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212 -- These are all default values provided in the declaration of the
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213 -- type File_Type.
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214
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215 if (not (Data_Base_File_Key = Default_Descriptor)) and then
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216 (((not (File_Table(1).Name = Default_Filename)) or
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217 (File_Table(1).Descriptor /= Default_Descriptor)) or else
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218 ((File_Table(1).Acct_Access /= Default_Permission) or
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219 (not (File_Table(1).Mode = Default_Mode)) or
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220 (File_Table(1).Current_Status /= Default_Status)))
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221 then
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222 Report.Failed ("Initial condition failure");
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223 end if;
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224
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225 -- Create/initialize file using the capability provided by the visible
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226 -- interface to the operating system, OS.File_Manager. The actual
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227 -- processing routine is contained in the private grandchild package
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228 -- Internals, which utilize the components from the grandparent package.
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229
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230 File_Manager.Create_File (New_Mode, Data_Base_File_Key);
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231
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232 -- Verify that the initial conditions of the file table component have
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233 -- been properly modified by the initialization function.
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234
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235 if not ((File_Table(1).Descriptor = Data_Base_File_Key) and then
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236 (File_Table(1).Name = An_Ada_File_Name) and then
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237 (File_Table(1).Acct_Access = User) and then
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238 not ((File_Table(1).Mode = Default_Mode) or else
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239 (File_Table(1).Current_Status = Default_Status)))
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240 then
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241 Report.Failed ("File creation failure");
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242 end if;
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243
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244 Report.Result;
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245
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246 end CA11009;
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