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// Copyright (C) 1996 The New York Group Theory Cooperative
// See magnus/doc/COPYRIGHT for the full notice.
//
// Contents: Declarations of class RandomAutoInFree
//
// Principal Author:Alexey Myasnikov
//
// Status: in progress
//
// Revision History:
//
#ifndef _RANDOMAUTOINFREE_H_
#define _RANDOMAUTOINFREE_H_
#include "RandomNumbers.h"
#include "FreeGroup.h"
#include "Map.h"
//---------------------------------------------------------------------------//
//--------------------------- RandomAutoInFree ------------------------------//
//---------------------------------------------------------------------------//
class RandomAutoInFree
{
public:
/////////////////////////////////////////////////////////////////////////
// //
// Constructors: //
// //
/////////////////////////////////////////////////////////////////////////
RandomAutoInFree(const FreeGroup& F, int avgNumGens);
/////////////////////////////////////////////////////////////////////////
// //
// Accessors: //
// //
/////////////////////////////////////////////////////////////////////////
Map getAutomorphism();
// Returns random automorhism.
Map getFiniteAutomorphism(int& order);
// Returns random automorhism of finite order. "order" is equal to
// order of automorpism.
Trichotomy isFiniteAutomorphism(const Map& m,int& order)const;
// Returns true if automorhism of finite order, no if not and dontknow, if
// it can't solve this problem. "order" is equal to order of automorpism if it finite.
private:
bool isTooLong(const VectorOf<Word>& images )const;
int sumOfImagesLens(const VectorOf<Word>& images)const;
/////////////////////////////////////////////////////////////////////////
// //
// Data Members: //
// //
/////////////////////////////////////////////////////////////////////////
static const short MAXLENGTH = 32767; //??????????????????
FreeGroup theGroup;
int numberOfGroupGens;
NormalRandom numGensPicker;
UniformRandom typeGenPicker;
int avgNumGens;
};
#endif
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