// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2012 OPEN CASCADE SAS
//
// The content of this file is subject to the Open CASCADE Technology Public
// License Version 6.5 (the "License"). You may not use the content of this file
// except in compliance with the License. Please obtain a copy of the License
// at http://www.opencascade.org and read it completely before using this file.
//
// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
//
// The Original Code and all software distributed under the License is
// distributed on an "AS IS" basis, without warranty of any kind, and the
// Initial Developer hereby disclaims all such warranties, including without
// limitation, any warranties of merchantability, fitness for a particular
// purpose or non-infringement. Please see the License for the specific terms
// and conditions governing the rights and limitations under the License.

#include <Standard_NoSuchObject.hxx>
#include <Standard_NoMoreObject.hxx>

// --------------------------------
// constructor of StackIterator
// --------------------------------

PCollection_StackIterator::PCollection_StackIterator
          (const Handle(PCollection_HStack)& S) 
{
     TheIterator = S->FTop();
}

// -----------------------------------
// More : returns Standard_True if there 
// are other items
// -----------------------------------
Standard_Boolean PCollection_StackIterator::More() const
{
       return (! TheIterator->IsEmpty());
}

// -----------------------------------------
// Next : Set the iterator to the next item
// -----------------------------------------
void PCollection_StackIterator::Next()
{
    if (TheIterator->IsEmpty())  Standard_NoMoreObject::Raise();  
    TheIterator = TheIterator->Tail();
}

// ---------------------------------------
// Value : returns the current item value 
// of the iterator
// ---------------------------------------
Item PCollection_StackIterator::Value() const
{
    if (TheIterator->IsEmpty()) Standard_NoSuchObject::Raise();
    return TheIterator->Value();
}