conditionalExpression.h

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/*******************************************************************************
** Copyright (c) 2004 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/
/*******************************************************************************
** $RCSfile: conditionalExpression.h,v $ $Revision: 1.6 $ $State: Exp $
*******************************************************************************/

#ifndef DtMyConditionalExpression_H_
#define DtMyConditionalExpression_H_

#include "vrfutil/condExpr.h"
#include "vrfutil/condExprTypes.h"
#include "vrfutil/rdrWritr.h"
#include "vrfutil/rwString.h"


namespace vrfAddConditionalExample
{
   //This is the integer type which represents MyConditionalExpression on
   //the network. By starting conditional expression types from 
   //MIN_USER_CONDITIONAL_EXPRESSION_TYPE, defined in condExprTypes.h, conflicts
   //with existing VR-Forces types can be avoided.
   const int DtCondExprFacingNorthType = MIN_USER_CONDITIONAL_EXPRESSION_TYPE + 1;

   //This is the string type which represents MyConditionalExpression in
   //plan files. It must not contain any spaces.
   const char DtCeFacingNorthTypeName[] = "FacingNorth";


   //This struct is the fixed portion of the network representation of a 
   //facing north conditional expression.
   struct DtNetCeFacingNorth
   {
      DtNetU8 myEntityNameStringLength;  //1 byte
      DtNetU8 myModifierStringLength;    //1 byte
      //padding to insure the structure is aligned on an 8 byte boundary
      DtNetU8 myPadding;                 //1 byte
      DtNetU8 myPadding1;                //1 byte
      DtNetU8 myPadding2;                //1 byte
      DtNetU8 myPadding3;                //1 byte
      DtNetU8 myPadding4;                //1 byte
      DtNetU8 myPadding5;                //1 byte
   };

   class MyConditionalExpression : public DtSimCondExpr
   {
   public:

      //default constructor
   MyConditionalExpression();

      //real constructor
   MyConditionalExpression(DtReaderWriterRegistry* parentRegistry);

      //copy constructor
   MyConditionalExpression(const MyConditionalExpression& orig,
      DtReaderWriterRegistry* parentRegistry = NULL);

      //destructor
   virtual ~MyConditionalExpression();

      //assignment operator
   MyConditionalExpression& operator=(const MyConditionalExpression& orig);

      //clone operator
   virtual DtSimCondExpr* clone(DtReaderWriterRegistry* parentRegistry = NULL);

      //Returns DtNetCeFacingNorthType (defined above).
   virtual int type() const;

      //Set the entity name
   virtual void setEntityName(const DtString& name);
      //Returns the entity name
   virtual const DtString& entityName() const;

      //Set the test modifier.
      //  If it is an empty string, checks only the specified entity. 
      //  If it is the string "ANY", checks all subordinate entities to see if 
      //  any of them match the test,
      //  If it is neither of the above, it requires that all specified entities 
      //  match.
   virtual void setModifier(const DtString& arg);
      //Returns the modifier
   virtual const DtString& modifier() const;

      //Get a readable string representation of this level of this expression.
      //
      //The subExprIndex argument indicates which stringRep to get if this
      //expression can have sub-expressions.  Since the facing north test has
      //no sub-expressions, it only returns a string representation if passed an
      //index of DtSimCondExpr::DtSR_EXPR.
      //
      //See the documentation for DtSimCondExpr::stringRep for more
      //information.
   virtual DtString stringRep(int subExprIndex = DtSR_EXPR) const;

      //returns the size of the full network representation 
      //padded to an 8-byte boundary.
   virtual int netRepSize() const;

      //Fills in the expression from the network buffer
   virtual bool setFromNet(const char* contentBuffer, 
      unsigned contentSize);

      //Fills in the network buffer (created by base class conditional 
      //expression) with the conditional expression contents.
   virtual bool setToNet();

      //Returns a new MyConditionalExpression
   static DtSimCondExpr * creator();

   protected:
      //The name of the entity to evaluate
   DtRwString myEntityName;

      //The modifier (set via the "Any" checkbox in the GUI)
   DtRwString myModifier;
   };

#endif

}