cppRenEdge.html

// COM1205 Propagation Pattern for DemDraw Project.
//
// Created by Young Soo Yang (yyang@ccs.neu.edu)
//
// This propagation pattern will traverse all the edges stored in a
// Graph object to rename a construction edge.
// To do this, it checks three conditions first,
//
//   1. checks old label name by calling cppCompEdgeName() propagation
//      pattern with argument Labelname
//   2. checks source vertex name of an edge by calling cppCompVertName()
//      propagation pattern with argument SrcLabelname.
//   3. checks destination vertex name by calling cppCompVertName() propagation
//      pattern with argument DesLabelname.
//
// If they are all satisfied, it changes the edge name to NewLabelname by
// calling cppSetEdgeName() and returns 1 to the caller, otherwise, returns 0.
//
// Modification History:
//
// 11/25/95 - Young Soo Yang (yyang@ccs.neu.edu)
//	Modified to make it more structure shy - using g_equal & g_delete
//	instead of strcmp & delete.
//


*operation* int cppRenEdge(char* Labelname,    char* SrcLabelname,
			   char* DesLabelname, char* NewLabelname)
   *init* (@ 0 @)
   *traverse*
      *from* Graph
	 *through* -> *,edges,*
      *to*   ConstEdge

   *wrapper* Graph
      *suffix*
      (@
         this -> cppDrawVertices();
         this -> cppDrawEdges();
      @)

   *wrapper* ConstEdge
      (@
         if (this->cppCompEdgeName(Labelname) &&
             this->get_from()->cppCompVertName(SrcLabelname) &&
             this->get_to()->cppCompVertName(DesLabelname)) {

            this->cppSetEdgeName(NewLabelname);
            return_val = 1;
         }
      @)