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    Types: TextFile
    Names: »B«

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TextFile

with Expertsystem;
use Expertsystem;

package body Box is

    type Box_Structure is
        record
            Size  : Natural;
            State : States;
        end record;


    package Behavior is new Classbehavior (Box_Structure, "BOXES     ");


------------------------------------------------------------------------------
    function Size (O : Object) return Natural is
    begin
        return Behavior.Get (O).Size;
    end Size;

    function State (O : Object) return States is
    begin
        return Behavior.Get (O).State;
    end State;

------------------------------------------------------------------------------
    function Instances (Kind : Existences := Empty_Boxes)
                       return Collection.Object is
        function Empty_Predicate (O : Object) return Boolean is
        begin
            return Behavior.Get (O).State = Is_Empty;
        end Empty_Predicate;
        function Empty is new Collection.Restrict (Empty_Predicate);
    begin
        case Kind is
            when All_Boxes =>
                return Behavior.Instances;  
            when Empty_Boxes =>
                return Empty (Behavior.Instances);
            when others =>
                return Behavior.Instances;
        end case;
    end Instances;

------------------------------------------------------------------------------
    function Exist (With_State : States; In_Kind_Of_Collection : Existences)
                   return Boolean is
        function Is_State (O : Object) return Boolean is
        begin
            return Behavior.Get (O).State = With_State;
        end Is_State;  
        function Exist_State is new Collection.Exist (Is_State);
    begin
        return Exist_State (Instances (Kind => In_Kind_Of_Collection));
    end Exist;

    function Exist (Greater_Than : Natural; In_Kind_Of_Collection : Existences)
                   return Boolean is
        function Is_Greater_Than (O : Object) return Boolean is
        begin
            return Behavior.Get (O).Size > Greater_Than;
        end Is_Greater_Than;  
        function Exist_Greater is new Collection.Exist (Is_Greater_Than);
    begin
        return Exist_Greater (Instances (Kind => In_Kind_Of_Collection));
    end Exist;

    function Exist (Between               : Natural;
                    And_Size              : Natural;
                    In_Kind_Of_Collection : Existences) return Boolean is
        function Is_Between (O : Object) return Boolean is
        begin
            return Behavior.Get (O).Size > Between and
                      Behavior.Get (O).Size < And_Size;
        end Is_Between;  
        function Exist_Between is new Collection.Exist (Is_Between);
    begin
        return Exist_Between (Instances (Kind => In_Kind_Of_Collection));
    end Exist;

------------------------------------------------------------------------------
    function Add (With_Size  : Natural := Default_Size;
                  With_State : States  := Default_State) return Object is
        A_Box : Box_Structure;
    begin
        A_Box.Size  := With_Size;
        A_Box.State := With_State;
        return Behavior.Allocate (Initvalue => A_Box);
    end Add;

------------------------------------------------------------------------------
    procedure Change (O : Object; With_Size : Natural; With_State : States) is
        A_Box : Box_Structure;
    begin
        A_Box       := Behavior.Get (Aref => O);
        A_Box.Size  := With_Size;
        A_Box.State := With_State;
        Behavior.Set (Aref => O, Withvalue => A_Box);
    end Change;

    procedure Change (O : Object; With_State : States) is
        A_Box : Box_Structure;
    begin
        A_Box       := Behavior.Get (Aref => O);
        A_Box.State := With_State;
        Behavior.Set (Aref => O, Withvalue => A_Box);
    end Change;

------------------------------------------------------------------------------
    procedure Delete (O : Object) is
    begin
        Behavior.Dispose (Aref => O);
    end Delete;

------------------------------------------------------------------------------
    procedure Clean is
    begin
        Behavior.Clear;
    end Clean;


end Box;