cexpression.h

//==========================================================================
//   CEXPRESSION.H  - part of
//                     OMNeT++/OMNEST
//            Discrete System Simulation in C++
//
//  Author: Andras Varga
//
//==========================================================================

/*--------------------------------------------------------------*
  Copyright (C) 1992-2008 Andras Varga
  Copyright (C) 2006-2008 OpenSim Ltd.

  This file is distributed WITHOUT ANY WARRANTY. See the file
  `license' for details on this and other legal matters.
*--------------------------------------------------------------*/

#ifndef __CEXPRESSION_H
#define __CEXPRESSION_H

#include "cobject.h"
#include "cexception.h"
#include "cnedvalue.h"

NAMESPACE_BEGIN

class cXMLElement;

class SIM_API cExpression : public cObject
{
  public:

    explicit cExpression() {}

    cExpression(const cExpression& other) : cObject(other) {}

    virtual ~cExpression() {}

    cExpression& operator=(const cExpression& other) {return *this;}

    virtual cExpression *dup() const {copyNotSupported(); return NULL;}

    virtual std::string info() const {return "";}

    virtual void parsimPack(cCommBuffer *buffer)  {throw cRuntimeError(this, eCANTPACK);}

    virtual void parsimUnpack(cCommBuffer *buffer)  {throw cRuntimeError(this, eCANTPACK);}


    virtual cNEDValue evaluate(cComponent *context=NULL) const {return cNEDValue();} //TODO in 5.0: make this pure virtual, and remove type-specific getters (boolValue(), etc)

    virtual bool boolValue(cComponent *context=NULL) = 0;

    virtual long longValue(cComponent *context=NULL, const char *expectedUnit=NULL) = 0;

    virtual double doubleValue(cComponent *context=NULL, const char *expectedUnit=NULL) = 0;

    virtual std::string stringValue(cComponent *context=NULL) = 0;

    virtual cXMLElement *xmlValue(cComponent *context=NULL) = 0;

    virtual std::string str() const = 0;

    virtual void parse(const char *text) = 0;

    virtual int compare(const cExpression *other) const = 0;

    virtual bool containsConstSubexpressions() const = 0;

    virtual void evaluateConstSubexpressions(cComponent *context) = 0;
};

NAMESPACE_END


#endif