// File:	MDF_DriverTable.gxx
//      	-------------------
// Author:	DAUTRY Philippe
//		<fid@fox.paris1.matra-dtv.fr>
// Copyright:	Matra Datavision 1997

// Version:	0.0
// History:	Version	Date		Purpose
//		0.0	May  6 1997	Creation


#include TheHDriver_hxx
#include MDF_DataMapIteratorOfTypeDriverListMap_hxx
#include MDF_DriverList_hxx


//=======================================================================
//function : MDF_DriverTable
//purpose  : 
//=======================================================================

MDF_DriverTable::MDF_DriverTable() :
myVersion(-1)
{}


//=======================================================================
//function : SetDriver
//purpose  : Sets a driver in its List,
//           in decreasing version number order
//=======================================================================

void MDF_DriverTable::SetDriver
(const Handle(TheHDriver)& anHDriver) 
{
  const Handle(Standard_Type)& type = anHDriver->SourceType();
  if (myMapOfLst.IsBound(type)) {
    MDF_DriverList& lst = myMapOfLst.ChangeFind(type);
    if (lst.IsEmpty()) {
      lst.Append(anHDriver);
    }
    else {
      Standard_Integer driverVersion = anHDriver->VersionNumber();
      Standard_Integer currentVersion;
      for (MDF_ListIteratorOfDriverList itr(lst); itr.More(); itr.Next()) {
	const Handle(TheHDriver)& driver = itr.Value();
	currentVersion = driver->VersionNumber();
	if (driverVersion == currentVersion) {
	  lst.Remove(itr);
	  if (lst.IsEmpty()) lst.Append(anHDriver);
	  else               lst.InsertBefore(anHDriver,itr);
	  break;
	}
	else if (driverVersion > currentVersion) {
	  lst.InsertAfter(anHDriver,itr);
	  break;
	}
      }
    }
  }
  else {
    MDF_DriverList lst;
    lst.Append(anHDriver);
    myMapOfLst.Bind(type,lst);
  }
  myMap.Clear();
}


//=======================================================================
//function : SetDrivers
//purpose  : 
//=======================================================================

void MDF_DriverTable::SetDrivers
(const Handle(TheDriverHSeq)& aDriverHSeq) 
{
  const Standard_Integer upper = aDriverHSeq->Length();
  for (Standard_Integer i = 1; i <= upper; ++i)
    SetDriver(aDriverHSeq->Value(i));
}


//=======================================================================
//function : GetDrivers
//purpose  : 
//=======================================================================

const TheTypeDriverMap& MDF_DriverTable::GetDrivers
(const Standard_Integer aVersion)
{
  if ((myMap.IsEmpty()) || (myVersion != aVersion)) {
    // Rebuild the map.
    Handle(TheHDriver) driver;
    MDF_DataMapIteratorOfTypeDriverListMap itr(myMapOfLst);
    for ( ; itr.More(); itr.Next()) {
      const Handle(Standard_Type)& type = itr.Key();
      if (MDF_DriverTable::GetDriver(type, driver, aVersion))
	myMap.Bind(type, driver);
    }
    myVersion = aVersion;
  }
  return myMap;
}

//=======================================================================
//function : GetDriver
//purpose  : 
//=======================================================================

Standard_Boolean MDF_DriverTable::GetDriver
(const Handle(Standard_Type)& aType,
 Handle(TheHDriver)& anHDriver,
 const Standard_Integer aVersion) const
{
  Standard_Boolean found = Standard_False;
  if (myMapOfLst.IsBound(aType)) {
    const MDF_DriverList& lst = myMapOfLst.Find(aType);
    if ( (aVersion == 0) && !lst.IsEmpty() ) {
      found = Standard_True;
      anHDriver = lst.First();
    }
    else {
      for (MDF_ListIteratorOfDriverList itr(lst); itr.More(); itr.Next()) {
	const Handle(TheHDriver)& driver = itr.Value();
	if (driver->VersionNumber() >= aVersion) {
	  found = Standard_True;
	  anHDriver = driver;
	  break;
	}
      }
    }
  }
  return found;
}