// File:      NCollection_BaseVector.hxx
// Created:   24.04.02 09:41:39
// Author:    Alexander GRIGORIEV
// Copyright: Open Cascade 2002


#ifndef NCollection_BaseVector_HeaderFile
#define NCollection_BaseVector_HeaderFile

#include <Standard_TypeDef.hxx>
#include <NCollection_BaseAllocator.hxx>
#include <stddef.h>

#if !defined No_Exception && !defined No_Standard_OutOfRange
#include <Standard_OutOfRange.hxx>
#endif

#ifdef WNT
#pragma warning(push, 1)
#pragma warning(disable:4355)
#endif

// this value defines the number of blocks that are reserved
// when the capacity of vector is increased
inline Standard_Integer GetCapacity (const Standard_Integer theIncrement)
{
  return Max(theIncrement/8, 1);
}

/**
 *  Class NCollection_BaseVector - base for generic vector
 */
class NCollection_BaseVector 
{
 public:
  // ------------ Class MemBlock ------------
  class MemBlock {
  protected:
    MemBlock (NCollection_BaseAllocator* theAlloc)
      : myFirstInd(0), myLength(0), mySize(0), myAlloc(theAlloc), myData(0L) {}
    MemBlock (const Standard_Integer theFirstInd,
              const Standard_Integer theLength,
              NCollection_BaseAllocator* theAlloc)
      : myFirstInd(theFirstInd), myLength(0), mySize(theLength), myAlloc(theAlloc), myData(0L) {}
    virtual void        Reinit     (const Standard_Integer,
                                    const size_t) {}
    Standard_Integer    FirstIndex () const     { return myFirstInd; }
    size_t              Size       () const     { return mySize; }
  public:
    virtual             ~MemBlock () {}
    void                SetLength  (const size_t theLen)
                                                { myLength = theLen; }
    size_t              Length     () const     { return myLength; }
    void *              Find       (const Standard_Integer theInd,
                                    const size_t           theSize) const
                                    { return ((char *) myData)+theInd*theSize;}
    Standard_EXPORT Standard_Integer
                        GetIndexV  (void * theItem, const size_t theSz) const;
  protected:
    Standard_Integer             myFirstInd;
    size_t                       myLength;
    size_t                       mySize;
    NCollection_BaseAllocator    * myAlloc;
    void                         * myData;
    friend class NCollection_BaseVector;
  };

  class Iterator {
  protected:
    Iterator () :
      myICurBlock (0), myIEndBlock (0), myCurIndex (0), myEndIndex (0) {}
    Iterator (const NCollection_BaseVector& theVector) { InitV (theVector); }
    Iterator (const Iterator& theVector)               { CopyV (theVector); }
    Standard_EXPORT void InitV (const NCollection_BaseVector& theVector);
    Standard_EXPORT void CopyV (const Iterator&);
    Standard_Boolean     MoreV () const
        { return (myICurBlock < myIEndBlock || myCurIndex < myEndIndex); }
    void                 NextV ()
        { if (++myCurIndex >= myVector -> myData[myICurBlock].Length() &&
              myICurBlock < myIEndBlock)
          { ++myICurBlock; myCurIndex = 0; } }
    const MemBlock *     CurBlockV () const
        { return &myVector -> myData[myICurBlock]; }

    const NCollection_BaseVector * myVector;   // the Master vector
    size_t                       myICurBlock;  // # of the current block
    size_t                       myIEndBlock;
    size_t                       myCurIndex;   // Index in the current block
    size_t                       myEndIndex;
  };

 protected:
  // ------------ Block initializer ---------
  typedef MemBlock * (* FuncPtrDataInit) (const NCollection_BaseVector&,
                                          const Standard_Integer aCapacity,
                                          const void             * aSource,
                                          const Standard_Integer aSize);
  typedef void (* FuncPtrDataFree)       (const NCollection_BaseVector&,
                                          MemBlock *);

  friend class Iterator;

  // ---------- PROTECTED METHODS ----------

  //! Empty constructor
  NCollection_BaseVector (const size_t           theSize,
                          const Standard_Integer theInc,
                          FuncPtrDataInit        theDataInit,
                          FuncPtrDataFree        theDataFree)
     : myItemSize  (theSize),
       myIncrement (theInc),
       myLength    (0),
       myCapacity  (GetCapacity(myIncrement)),
       myNBlocks   (0),
       myData      (theDataInit (* this, myCapacity, NULL, 0)),
       myDataInit  (theDataInit),
       myDataFree  (theDataFree)
  {
//    myData = (MemBlock *) new char [myCapacity * sizeof(MemBlock)];
//    for (Standard_Integer i = 0; i < myCapacity; i++)
//      new (&myData[i]) MemBlock;
  }

  //! Copy constructor
  NCollection_BaseVector (const NCollection_BaseVector& theOther,
                          FuncPtrDataInit               theDataInit,
                          FuncPtrDataFree               theDataFree)
    : myItemSize  (theOther.myItemSize),
      myIncrement (theOther.myIncrement),
      myLength    (theOther.Length()),
      myCapacity  (GetCapacity(myIncrement)+theOther.Length()/theOther.myIncrement),
      myNBlocks   (1 + (theOther.Length() - 1)/theOther.myIncrement),
      myData      (theDataInit (* this, myCapacity, NULL, 0)),
      myDataInit  (theDataInit),
      myDataFree  (theDataFree)  {}

  //! Destructor
  Standard_EXPORT ~NCollection_BaseVector ();

  //! Operator =
  Standard_EXPORT NCollection_BaseVector& operator =
                                 (const NCollection_BaseVector&);

  //! ExpandV: returns pointer to memory where to put the new item
  Standard_EXPORT void * ExpandV (const Standard_Integer theIndex);

  //! Find: locate the memory holding the desired value
  inline          void * Find    (const Standard_Integer theIndex) const;

 public:
  //! Total number of items
  Standard_Integer      Length  () const      { return myLength; }

  //! Empty the vector of its objects
  Standard_EXPORT void  Clear   ();

 protected:
  // ---------- PRIVATE FIELDS ----------
  size_t                myItemSize;
  Standard_Integer      myIncrement;
  Standard_Integer      myLength;
  Standard_Integer      myCapacity;
  Standard_Integer      myNBlocks;
  MemBlock              * myData;
  FuncPtrDataInit       myDataInit;
  FuncPtrDataFree       myDataFree;
};

//=======================================================================
//function : Find
//purpose  : locate the memory holding the desired value
//=======================================================================

inline void * NCollection_BaseVector::Find
                                        (const Standard_Integer theIndex) const
{
#if !defined No_Exception && !defined No_Standard_OutOfRange
  if (theIndex < 0 || theIndex >= myLength)
    Standard_OutOfRange::Raise ("NCollection_BaseVector::Find");
#endif
  const Standard_Integer aBlock = theIndex / myIncrement;
  return myData[aBlock].Find (theIndex - aBlock * myIncrement, myItemSize);
}

#ifdef WNT
#pragma warning(pop)
#endif

#endif