-- Created on: 1992-12-09
-- Created by: Christian CAILLET
-- Copyright (c) 1992-1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

deferred class SelectAnyList  from IFSelect  inherits SelectDeduct


    ---Purpose : A SelectAnyList kind Selection selects a List of an Entity, as
    --           well as this Entity contains some. A List contains sub-entities
    --           as one per Item, or several (for instance if an Entity binds
    --           couples of sub-entities, each item is one of these couples).
    --           Remark that only Entities are taken into account (neither
    --           Reals, nor Strings, etc...)
    --           
    --           To define the list on which to work, SelectAnyList has two
    --           deferred methods : NbItems (which gives the length of the
    --           list), FillResult (which fills an EntityIterator). They are
    --           intended to get a List in an Entity of the required Type (and
    --           consider that list is empty if Entity has not required Type)
    --           
    --           In addition, remark that some types of Entity define more than
    --           one list in each instance : a given sub-class of SelectAnyList
    --           must be attached to one list
    --           
    --           SelectAnyList keeps or rejects a sub-set of the list,
    --           that is the Items of which rank in the list is in a given
    --           range (for instance form 2nd to 6th, etc...)
    --           Range is defined by two Integer values. In order to allow
    --           external control of them, these values are not directly
    --           defined as fields, but accessed through IntParams, that is,
    --           referenced as Transient (Handle) objects
    --
    --           Warning : the Input can be any kind of Selection, BUT its
    --           RootResult must have zero (empty) or one Entity maximum

uses AsciiString from TCollection, Transient, EntityIterator, Graph, IntParam

raises OutOfRange, InterfaceError

is

    KeepInputEntity (me; iter : in out EntityIterator) is deferred;
    ---Purpose : Keeps Input Entity, as having required type. It works by
    --           keeping in <iter>, only suitable Entities (SelectType can be
    --           used). Called by RootResult (which waits for ONE ENTITY MAX)

    NbItems (me; ent : Transient) returns Integer  is deferred;
    ---Purpose : Returns count of Items in the list in the Entity <ent>
    --           If <ent> has not required type, returned value must be Zero


    SetRange (me : mutable; rankfrom, rankto : mutable IntParam);
    ---Purpose : Sets a Range for numbers, with a lower and a upper limits

    SetOne  (me : mutable; rank : mutable IntParam);
    ---Purpose : Sets a unique number (only one Entity will be sorted as True)

    SetFrom (me : mutable; rankfrom : mutable IntParam);
    ---Purpose : Sets a Lower limit but no upper limit

    SetUntil (me : mutable; rankto : mutable IntParam);
    ---Purpose : Sets an Upper limit but no lower limit (equivalent to lower 1)

    HasLower (me) returns Boolean;
    ---Purpose : Returns True if a Lower limit is defined

    Lower (me) returns mutable IntParam;
    ---Purpose : Returns Lower limit (if there is; else, value is senseless)

    LowerValue (me) returns Integer;
    ---Purpose : Returns Integer Value of Lower Limit (0 if none)

    HasUpper (me) returns Boolean;
    ---Purpose : Returns True if a Lower limit is defined

    Upper (me) returns mutable IntParam;
    ---Purpose : Returns Upper limit (if there is; else, value is senseless)

    UpperValue (me) returns Integer;
    ---Purpose : Returns Integer Value of Upper Limit (0 if none)


    RootResult (me; G : Graph) returns EntityIterator  raises InterfaceError;
    ---Purpose : Returns the list of selected entities (list of entities
    --           complying with rank criterium)
    --           Error if the input list has more than one Item

    FillResult (me; n1,n2 : Integer; ent : Transient;
    	res : in out EntityIterator)  is deferred;
    ---Purpose : Puts into <res>, the sub-entities of the list, from n1 to
    --           n2 included. Remark that adequation with Entity's type and
    --           length of list has already been made at this stage
    --           Called by RootResult


    Label (me) returns AsciiString from TCollection;
    ---Purpose : Returns a text defining the criterium : "Componants of List "
    --           then Specific List Label, then, following cases :
    --           " From .. Until .." or "From .." or "Until .." or "Rank no .."
    --           Specific type is given by deferred method ListLabel

    ListLabel (me) returns AsciiString from TCollection  is deferred;
    ---Purpose : Returns the specific label for the list, which is included as
    --           a part of Label

fields

    thelower : IntParam;
    theupper : IntParam;

end SelectAnyList;