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// Copyright (C) 1995 The New York Group Theory Cooperative
// See magnus/doc/COPYRIGHT for the full notice.
// Contents: Declaration of class SMFPGroup
//
// Principal Author: Roger Needham
//
// Status: in progress
//
// Revision History:
//
#ifndef _SMFPGROUP_H_
#define _SMFPGROUP_H_
#include "AlgebraicObject.h"
#include "FPGroup.h"
#include "GIC.h"
#include "GCM.h"
#include "Supervisor.h"
//@njz:
#include "ComputationManager.h"
//
// This class is used to wrap all types of finitely presented groups,
// including free ones. The main reason is the strong typing required by
// the interface to the FE; if, e.g., free groups were a separate type,
// we would need four kinds of maps: FP -> FP, FP -> Free, etc.
//
// Unfortunately, this leads to other hassles: to do a specialized
// computation for a certain kind of group, one must either `intercept'
// the computation request with a specialized computation manager, or
// check for the special kind in the generic computation manager.
//
// This class also records information about the group which is true by
// the end user's definition:
//
// * The group was entered with an empty relator set. The more general
// information that the group is free (on some set of generators) is
// recorded by the GIC.
//
// * The group was entered as an abelian (resp. nilpotent)
// presentation. The commutators are not stored in the relator set of
// the `theGroup' member (unless the end user typed them). All
// computations with abelian (resp. nilpotent) groups are intercepted
// by specialized CMs which use the commutators implicitly.
//@rn Perhaps free is the only special case in this sense?
//---------------------------------------------------------------------------//
//--------------------------- SMFPGroup -------------------------------------//
//---------------------------------------------------------------------------//
class SMFPGroup : public AlgebraicObject
{
//@njz:
friend class ComputationManager;
//
public:
enum Checkin_Type {
FP, FREE, ABELIAN, NILPOTENT, SMALL_CANCELLATION, ONE_RELATOR,
AP_FREE, AP_FREE_CYCLIC, FREE_NILPOTENT, HNN_FREE, ONE_RELATOR_WITH_TORSION
};
/////////////////////////////////////////////////////////////////////////
// //
// Constructors: //
// //
/////////////////////////////////////////////////////////////////////////
SMFPGroup(const FPGroup& G, const Chars heritage, Checkin_Type t = FP,
Chars def = Chars());
SMFPGroup( ) : AlgebraicObject( "" ), gic( oid() ), theGCM( 0 ) { }
//@rn Bogus ctor; see `But no' comment in Menu.h.
/////////////////////////////////////////////////////////////////////////
// //
// Accessors: //
// //
/////////////////////////////////////////////////////////////////////////
FPGroup getFPGroup( ) const { return theGroup; }
FreeGroup getFreePreimage( ) const { return theFreePreimage; }
// When this group is F/R, it may be handy to have F.
GCM& gcm() const { return *theGCM; }
Checkin_Type getCheckinType( ) const { return checkin_type; }
Chars getCheckinTypeStr( ) const;
// Returns the checkin_type as a string of characters.
InformationCenter* infoCenter() { return &gic; }
const InformationCenter* infoCenter() const { return &gic; }
/////////////////////////////////////////////////////////////////////////
// //
// Front End Interfacing: //
// //
/////////////////////////////////////////////////////////////////////////
static const char* type( ) { return "SMFPGroup"; }
const IconID iconID( ) const { return IconID::group; } // overrides SMObject
const char* typeID( ) const { return type(); } // overrides SMObject
void viewStructure(ostream& ostr) const; // overrides SMObject
void printProperties(ostream& ostr) const; // overrides SMObject
void printDefinition(ostream& ostr) const; // overrides SMObject
static void printGlobalMessageTemplates(ostream& ostr) {
ostr << "init_map_gens_msg_ {${viewID} " << GENS_MAP_REQUEST
<< " ${oid2} ${message} }" << endl;
}
protected:
/////////////////////////////////////////////////////////////////////////
// //
// Restricted Access: //
// //
/////////////////////////////////////////////////////////////////////////
void readMessage(istream&); // overrides SMObject
/////////////////////////////////////////////////////////////////////////
// //
// Data Members: //
// //
/////////////////////////////////////////////////////////////////////////
public:
GIC gic;
private:
// These are the tags for messages handled by objects in this class:
enum MessageTag {
GENS_MAP_REQUEST
};
GCM* theGCM; // TheObjects removes theGCM when this is removed.
const FPGroup theGroup;
const FreeGroup theFreePreimage;
Checkin_Type checkin_type;
Chars definition;
};
#endif
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