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#include <Standard_MultiplyDefined.hxx>
#include <Standard_NoSuchObject.hxx>

// ----------------------------------------------------------------------
// 
// Map implementation:
// 
// Last Revision : Jan,8 1993 M. Mercien
//                 The class SingleList is no more referenced in the 
//                 implementation of Map.
// ----------------------------------------------------------------------

//----------------------------------------------------------------- 
// Constructor 
//----------------------------------------------------------------- 
PCollection_HDataMap::PCollection_HDataMap(const Integer NbBuckets,
                                 const FH& F)
{
   Buckets = new PCollection_Array( 1 , NbBuckets);
   Hash = F;
}


// ------------------------ READING --------------------------------

//----------------------------------------------------------------- 
// NbBuckets : Return the number of buckets
//----------------------------------------------------------------- 
Integer PCollection_HDataMap::NbBuckets() const
{
   return Buckets->Length();
}

//----------------------------------------------------------------- 
// IsEmpty : Return TRUE if the map is empty
//----------------------------------------------------------------- 
Boolean PCollection_HDataMap::IsEmpty() const 
{
   Handle(PCollection_MapNode) aNode;
   Boolean Empty = True;
   for (Integer i = 1 ; i <= Buckets->Length() ; i++) {
      aNode = Buckets->Value(i);
      if ( !aNode.IsNull() ) Empty = False;
   }
   return Empty;
}

//----------------------------------------------------------------- 
// Extent : Returns the number of couples (item,key) contained in 
//          the map.
//----------------------------------------------------------------- 
Integer PCollection_HDataMap::Extent() const 
{
   Integer Number = 0;
   Handle(PCollection_MapNode) aNode;
   for (Integer i = 1 ; i <= Buckets->Length() ; i++) {
     aNode = Buckets->Value(i);
     while ( !aNode.IsNull() ) {
        Number++;
        aNode = aNode->Next();
     }
   }
   return Number;
}

//----------------------------------------------------------------- 
// IsBound : Returns TRUE if an element is bounded by K
//----------------------------------------------------------------- 
Boolean PCollection_HDataMap::IsBound(const Key& K ) const 
{
   Integer Res;
   Key TheKey;
   Handle(PCollection_MapNode) aNode;
   Res = Hash.HashCode (K,Buckets->Length());  
   aNode = Buckets->Value(Res);
   while ( !aNode.IsNull() ) {
     TheKey = aNode->GetKey();
     if ( Hash.Compare(TheKey,K) ) return True;
     else aNode = aNode->Next();
   }
   return False;
}

//----------------------------------------------------------------- 
// Find : Returns the element bounded by K
//----------------------------------------------------------------- 
Item PCollection_HDataMap::Find(const Key& K ) const 
{
   Integer Res;
   Key TheKey;
   Handle(PCollection_MapNode) aNode;
   Res = Hash.HashCode (K,Buckets->Length());  
   aNode = Buckets->Value(Res);
   while ( ! aNode.IsNull() )  {
     TheKey = aNode->GetKey();
     if ( Hash.Compare(TheKey,K) ) return aNode->Value();
     else aNode = aNode->Next();
   }
   NoSuchObject::Raise();
}

// ------------------------ WRITING --------------------------------

//----------------------------------------------------------------- 
// Clear : Remove all couples (item,key) from the map.
//----------------------------------------------------------------- 
void PCollection_HDataMap::Clear() 
{
   Handle(PCollection_MapNode) aNode1,aNode2;
   for (Integer i = 1 ; i <= Buckets->Length() ; i++) {
     aNode1 = Buckets->Value(i);
     aNode2.Nullify();
     Buckets->SetValue(i,aNode2);
     while ( ! aNode1.IsNull() ) {
       aNode2 = aNode1->Next();
       aNode1.Delete();
       aNode1 = aNode2;
     }
   }
}

//- ---------------------------------------------------------------- 
// Bind : Add a new couple (Item,Key) in the map. The entry point in 
//        the map corresponds to the result of Hashcode function (i.e
//        HashCode (key)).
//- ---------------------------------------------------------------- 
void PCollection_HDataMap::Bind(const Key& K , const Item& T)
{
   Integer Res ;
   Key TheKey;
   Handle(PCollection_MapNode) aNode1,aNode2,pnul;
   pnul.Nullify();
   aNode1 = new PCollection_MapNode ( K , T , pnul) ;
   Res = Hash.HashCode (K,Buckets->Length());         
   aNode2 = Buckets->Value(Res);
   if ( ! aNode2.IsNull()) {
      while ( ! aNode2.IsNull() )  {
         TheKey = aNode2->GetKey();
         if ( Hash.Compare(TheKey,K) ) MultiplyDefined::Raise();
         aNode2 = aNode2->Next();
      }
      aNode2 = Buckets->Value(Res);
      aNode1->SetNext(aNode2);
   }
   Buckets->SetValue(Res,aNode1);
}

//----------------------------------------------------------------- 
// Rebind : For an existant couple (Key,AnItem) in the map change
//          le value of the item.
//          If the couple does not exist raise an exception
//----------------------------------------------------------------- 
void PCollection_HDataMap::Rebind(const Key& K , const Item& T)
{
   Integer Res ;
   Key TheKey;
   Handle(PCollection_MapNode) aNode;
   Res = Hash.HashCode (K,Buckets->Length());         
   aNode = Buckets->Value(Res);
   while ( ! aNode.IsNull() )  {
      TheKey = aNode->GetKey();
      if ( Hash.Compare(TheKey,K) ) {
        aNode->SetValue(T);
        return;
      } 
      else {
        aNode = aNode->Next();
      }
   }
   NoSuchObject::Raise();
}

//----------------------------------------------------------------- 
// Unbind : Remove the couple keyed by K
//          If the couple does not exist raise an exception
//----------------------------------------------------------------- 
void PCollection_HDataMap::Unbind(const Key& K) 
{
   Integer Res ;
   Key TheKey;
   Handle(PCollection_MapNode) aNode,pnul,previous,next;
   Res = Hash.HashCode (K,Buckets->Length());  
   aNode = Buckets->Value(Res);
   pnul.Nullify();
   previous.Nullify();
   while ( ! aNode.IsNull() ) {
      TheKey = aNode->GetKey();
      if ( Hash.Compare(TheKey,K) ) {        
        next = aNode->Next();    
        if (previous.IsNull() && next.IsNull()) {     // liste de 1 elt
           Buckets->SetValue(Res,pnul);
           aNode.Delete();

        } else if (previous.IsNull()) {               // 1er elt de liste
           Buckets->SetValue(Res,next);
           aNode.Delete();
           next.Nullify();

	} else if (next.IsNull()) {                  // dernier de liste      
           previous->SetNext(pnul);
           aNode.Delete();

        } else {                                    // milieu de liste
           previous->SetNext(next);
           aNode.Delete();
           next.Nullify();
        }
        return;
      }
      
      else {                                      //  pas le bon noeud
         previous = aNode;
         aNode = aNode->Next();
      }   
   }
   NoSuchObject::Raise();
}

//----------------------------------------------------------------- 
// ShallowCopy : ShallowCopy redefinition
//----------------------------------------------------------------- 
Handle(Standard_Persistent) PCollection_HDataMap::ShallowCopy() const
{
   PCollection_HDataMap* TheCopy = new PCollection_HDataMap (*this);
   TheCopy->Buckets = 
      Handle(PCollection_Array)::DownCast(::ShallowCopy(Buckets));
   return TheCopy;
}

//----------------------------------------------------------------- 
// ShallowDump : ShallowDump redefinition
//----------------------------------------------------------------- 
void PCollection_HDataMap::ShallowDump(OStream& S) const
{
  S << "begin class Map "<< endl;
  if (!IsEmpty()) 
       Buckets->ShallowDump(S);
  else   
       S << "Empty Map." << endl;
  S << "end of class Map." << endl;
}