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 // Created on: 1993-03-26
 // Created by: Christian CAILLET
 // Copyright (c) 1993-1999 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.
 
 #ifndef _StepData_SelectType_HeaderFile
 #define _StepData_SelectType_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Integer.hxx>
 #include <Standard_Type.hxx>
 #include <Standard_CString.hxx>
 #include <StepData_Logical.hxx>
 class Standard_Transient;
 class StepData_PDescr;
 class StepData_SelectMember;
 
 //! SelectType is the basis used for SELECT_TYPE definitions from
 //! the EXPRESS form. A SELECT_TYPE in EXPRESS is an enumeration
 //! of Types, it corresponds in a way to a Super-Type, but with
 //! no specific Methods, and no exclusivity (a given Type can be
 //! member of several SELECT_TYPES, plus be itself a SUB_TYPE).
 //!
 //! A SelectType can be field of a Transient Entity or only used
 //! to control an input Argument
 //!
 //! This class implies to designate each member Type by a Case
 //! Number which is a positive Integer value (this allows a faster treatment).
 //!
 //! With this class, a specific SelectType can :
 //! - recognize an Entity as complying or not with its definition,
 //! - storing it, with the guarantee that the stored Entity complies
 //! with the definition of the SelectType
 //! - and (if judged useful) give the stored Entity under the good
 //! Type rather than simply "Transient".
 class StepData_SelectType
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Recognizes the Type of an Entity. Returns a positive Number
   //! which identifies the Type in the definition List of the
   //! SelectType. Returns Zero if its Type in not in this List.
   Standard_EXPORT virtual int CaseNum(const occ::handle<Standard_Transient>& ent) const = 0;
 
   //! Returns True if the Type of an Entity complies with the
   //! definition list of the SelectType.
   //! Also checks for a SelectMember
   //! Default Implementation looks for CaseNum or CaseMem positive
   Standard_EXPORT bool Matches(const occ::handle<Standard_Transient>& ent) const;
 
   //! Stores an Entity. This allows to define a specific SelectType
   //! class with one read method per member Type, which returns the
   //! Value casted with the good Type.
   Standard_EXPORT void SetValue(const occ::handle<Standard_Transient>& ent);
 
   //! Nullifies the Stored Entity
   Standard_EXPORT void Nullify();
 
   //! Returns the Stored Entity. Can be used to define specific
   //! read methods (see above)
   Standard_EXPORT const occ::handle<Standard_Transient>& Value() const;
 
   //! Returns True if there is no Stored Entity (i.e. it is Null)
   Standard_EXPORT bool IsNull() const;
 
   //! Returns the Effective (Dynamic) Type of the Stored Entity
   //! If it is Null, returns TYPE(Transient)
   Standard_EXPORT occ::handle<Standard_Type> Type() const;
 
   //! Recognizes the Type of the stored Entity, or zero if it is
   //! Null or SelectMember. Calls the first method CaseNum on Value
   Standard_EXPORT int CaseNumber() const;
 
   //! Returns the Description which corresponds to <me>
   //! Null if no specific description to give. This description is
   //! used to control reading an check validity.
   //! Default returns a Null Handle, i.e. undefined description
   //! It can suffice if CaseNum and CaseMem give enough control
   Standard_EXPORT virtual occ::handle<StepData_PDescr> Description() const;
 
   //! Returns a preferred SelectMember. Default returns a Null
   //! By default, a SelectMember can be set according to data type
   //! and Name : it is a SelectNamed if Name is defined
   //!
   //! This method allows to define, for a specific SelectType, a
   //! specific SelectMember than SelectNamed. For instance for a
   //! Real plus a Name, a SelectReal plus a case number is a good
   //! solution, lighter than SelectNamed which is very multipurpose
   Standard_EXPORT virtual occ::handle<StepData_SelectMember> NewMember() const;
 
   //! Recognize a SelectMember (kind, name). Returns a positive
   //! value which identifies the case in the List of immediate cases
   //! (distinct from the List of Entity Types). Zero if not
   //! recognizes
   //! Default returns 0, saying that no immediate value is allowed
   Standard_EXPORT virtual int CaseMem(const occ::handle<StepData_SelectMember>& ent) const;
 
   //! Returns the Type of the stored SelectMember, or zero if it is
   //! Null or Entity. Calls the method CaseMem on Value
   Standard_EXPORT int CaseMember() const;
 
   //! Returns Value as a SelectMember. Null if not a SelectMember
   Standard_EXPORT occ::handle<StepData_SelectMember> Member() const;
 
   //! Returns the type name of SelectMember. If no SelectMember or
   //! with no type name, returns an empty string
   //! To change it, pass through the SelectMember itself
   Standard_EXPORT const char* SelectName() const;
 
   //! This internal method gives access to a value implemented by an
   //! Integer (to read it)
   Standard_EXPORT int Int() const;
 
   //! This internal method gives access to a value implemented by an
   //! Integer (to set it) : a SelectMember MUST ALREADY BE THERE !
   Standard_EXPORT void SetInt(const int val);
 
   //! Gets the value as an Integer
   Standard_EXPORT int Integer() const;
 
   //! Sets a new Integer value, with an optional type name
   //! Warning : If a SelectMember is already set, works on it : value and
   //! name must then be accepted by this SelectMember
   Standard_EXPORT void SetInteger(const int val, const char* const name = "");
 
   Standard_EXPORT bool Boolean() const;
 
   Standard_EXPORT void SetBoolean(const bool val, const char* const name = "");
 
   Standard_EXPORT StepData_Logical Logical() const;
 
   Standard_EXPORT void SetLogical(const StepData_Logical val, const char* const name = "");
 
   Standard_EXPORT double Real() const;
 
   Standard_EXPORT void SetReal(const double val, const char* const name = "");
 
   Standard_EXPORT virtual ~StepData_SelectType();
 
 private:
   occ::handle<Standard_Transient> thevalue;
 };
 
 #endif // _StepData_SelectType_HeaderFile

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