// store.h --
// $Id: store.h,v 1.7 2003/11/23 01:42:51 wcvs Exp $
// This is part of Metakit, see http://www.equi4.com/metakit/

/** @file
 * Definition of auxiliary storage management classes
 */

#ifndef __STORE_H__
#define __STORE_H__

/////////////////////////////////////////////////////////////////////////////

class c4_Dependencies
{
  c4_PtrArray _refs;

public:
  c4_Dependencies ();
  ~c4_Dependencies ();

  void Add(c4_Sequence* seq_);
  bool Remove(c4_Sequence* seq_);

  friend class c4_Notifier;
};

/////////////////////////////////////////////////////////////////////////////

class c4_Notifier
{
  c4_Sequence* _origin;
  c4_Notifier* _chain;
  c4_Notifier* _next;

public:
  enum { kNone, kSetAt, kInsertAt, kRemoveAt, kMove, kSet, kLimit };

  c4_Notifier (c4_Sequence* origin_);
  ~c4_Notifier ();

  bool HasDependents() const;

  void StartSetAt(int index_, c4_Cursor& cursor_);
  void StartInsertAt(int index_, c4_Cursor& cursor_, int count_);
  void StartRemoveAt(int index_, int count_);
  void StartMove(int from_, int to_);
  void StartSet(int index_, int propId_, const c4_Bytes& buf_);

  int _type;
  int _index;
  int _propId;
  int _count;
  c4_Cursor* _cursor;
  const c4_Bytes* _bytes;

private:
  void Notify();
};

/////////////////////////////////////////////////////////////////////////////

class c4_DerivedSeq : public c4_Sequence
{
protected:
  c4_Sequence& _seq;

protected:
  c4_DerivedSeq (c4_Sequence& seq_);
  virtual ~c4_DerivedSeq ();
  
public:
  virtual int RemapIndex(int, const c4_Sequence*) const;

  virtual int NumRows() const;
  virtual void SetNumRows(int size_);

  virtual int NumHandlers() const;
  virtual c4_Handler& NthHandler(int) const;
  virtual const c4_Sequence* HandlerContext(int) const;
  virtual int AddHandler(c4_Handler*);
  virtual c4_Handler* CreateHandler(const c4_Property&);

  virtual c4_Notifier* PreChange(c4_Notifier& nf_);
};

/////////////////////////////////////////////////////////////////////////////

class c4_StreamStrategy : public c4_Strategy
{
  c4_Stream* _stream;
  t4_byte* _buffer;
  t4_i32 _buflen;
  t4_i32 _position;
public:
  c4_StreamStrategy (t4_i32 buflen_);
  c4_StreamStrategy (c4_Stream* stream_);
  virtual ~c4_StreamStrategy ();

  virtual bool IsValid() const;
  virtual int  DataRead(t4_i32 pos_, void* buffer_, int length_);
  virtual void DataWrite(t4_i32 pos_, const void* buffer_, int length_);
  virtual t4_i32 FileSize();
};

/////////////////////////////////////////////////////////////////////////////

#if q4_INLINE
#include "store.inl"
#endif

/////////////////////////////////////////////////////////////////////////////

#endif