NullUnitImplementationLocation.hh

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file NullUnitImplementationLocation.hh
 *
 * Declaration of NullUnitImplementationLocation class.
 *
 * @author Lasse Laasonen 2005 (lasse.laasonen-no.spam-tut.fi)
 * @note rating: red
 */
 
#ifndef TTA_NULL_UNIT_IMPLEMENTATION_LOCATION_HH
#define TTA_NULL_UNIT_IMPLEMENTATION_LOCATION_HH
 
#include "Serializable.hh"
#include "UnitImplementationLocation.hh"
 
namespace IDF {
 
/**
 * Indicates what implementation of a unit is used. 
 *
 * A null class that indicates of unset location of implementation or
 * no implementation available.
 */
class NullUnitImplementationLocation : public UnitImplementationLocation  {
public:
    static NullUnitImplementationLocation& instance();
 
    virtual std::string hdbFile() const;
    virtual int id() const;
    virtual std::string unitName() const;
    virtual void setParent(MachineImplementation& parent);
 
protected:
    NullUnitImplementationLocation();
    virtual ~NullUnitImplementationLocation();
 
private:
    // the singleton instance of this class
    static NullUnitImplementationLocation instance_;
};
}
 
#endif