/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-  */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _MORKHANDLE_
#define _MORKHANDLE_ 1

#ifndef _MORK_
#  include "mork.h"
#endif

#ifndef _MORKNODE_
#  include "morkNode.h"
#endif

#ifndef _MORKDEQUE_
#  include "morkDeque.h"
#endif

#ifndef _MORKPOOL_
#  include "morkPool.h"
#endif

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class morkPool;
class morkObject;
class morkFactory;

#define morkDerived_kHandle /*i*/ 0x486E /* ascii 'Hn' */
#define morkHandle_kTag 0x68416E44       /* ascii 'hAnD' */

/*| morkHandle:
|*/
class morkHandle : public morkNode {
  // public: // slots inherited from morkNode (meant to inform only)
  // nsIMdbHeap*    mNode_Heap;

  // mork_base      mNode_Base;     // must equal morkBase_kNode
  // mork_derived   mNode_Derived;  // depends on specific node subclass

  // mork_access    mNode_Access;   // kOpen, kClosing, kShut, or kDead
  // mork_usage     mNode_Usage;    // kHeap, kStack, kMember, kGlobal, kNone
  // mork_able      mNode_Mutable;  // can this node be modified?
  // mork_load      mNode_Load;     // is this node clean or dirty?

  // mork_uses      mNode_Uses;     // refcount for strong refs
  // mork_refs      mNode_Refs;     // refcount for strong refs + weak refs

 public:  // state is public because the entire Mork system is private
  mork_u4 mHandle_Tag;           // must equal morkHandle_kTag
  morkEnv* mHandle_Env;          // pool that allocated this handle
  morkHandleFace* mHandle_Face;  // cookie from pool containing this
  morkObject* mHandle_Object;    // object this handle wraps for MDB API
  mork_magic mHandle_Magic;      // magic sig different in each subclass

  // { ===== begin morkNode interface =====
 public:  // morkNode virtual methods
  virtual void CloseMorkNode(
      morkEnv* ev) override;  // CloseHandle() only if open
  virtual ~morkHandle();      // assert that CloseHandle() executed earlier

 public:  // morkHandle construction & destruction
  morkHandle(
      morkEnv* ev,                // note morkUsage is always morkUsage_kPool
      morkHandleFace* ioFace,     // must not be nil, cookie for this handle
      morkObject* ioObject,       // must not be nil, the object for this handle
      mork_magic inMagic);        // magic sig to denote specific subclass
  void CloseHandle(morkEnv* ev);  // called by CloseMorkNode();

 private:  // copying is not allowed
  morkHandle(const morkHandle& other);
  morkHandle& operator=(const morkHandle& other);

 protected:  // special case empty construction for morkHandleFrame
  friend class morkHandleFrame;
  morkHandle() {}

 public:  // dynamic type identification
  mork_bool IsHandle() const {
    return IsNode() && mNode_Derived == morkDerived_kHandle;
  }
  // } ===== end morkNode methods =====

 public:  // morkHandle memory management operators
  void* operator new(size_t inSize, morkPool& ioPool, morkZone& ioZone,
                     morkEnv* ev) noexcept(true) {
    return ioPool.NewHandle(ev, inSize, &ioZone);
  }

  void* operator new(size_t inSize, morkPool& ioPool,
                     morkEnv* ev) noexcept(true) {
    return ioPool.NewHandle(ev, inSize, (morkZone*)0);
  }

  void* operator new(size_t inSize, morkHandleFace* ioFace) noexcept(true) {
    MORK_USED_1(inSize);
    return ioFace;
  }

 public:  // other handle methods
  mork_bool GoodHandleTag() const { return mHandle_Tag == morkHandle_kTag; }

  void NewBadMagicHandleError(morkEnv* ev, mork_magic inMagic) const;
  void NewDownHandleError(morkEnv* ev) const;
  void NilFactoryError(morkEnv* ev) const;
  void NilHandleObjectError(morkEnv* ev) const;
  void NonNodeObjectError(morkEnv* ev) const;
  void NonOpenObjectError(morkEnv* ev) const;

  morkObject* GetGoodHandleObject(morkEnv* ev, mork_bool inMutable,
                                  mork_magic inMagicType,
                                  mork_bool inClosedOkay) const;

 public:  // interface supporting mdbObject methods
  morkEnv* CanUseHandle(nsIMdbEnv* mev, mork_bool inMutable,
                        mork_bool inClosedOkay, nsresult* outErr) const;

  // { ----- begin mdbObject style methods -----
  nsresult Handle_IsFrozenMdbObject(nsIMdbEnv* ev, mdb_bool* outIsReadonly);

  nsresult Handle_GetMdbFactory(nsIMdbEnv* ev, nsIMdbFactory** acqFactory);
  nsresult Handle_GetWeakRefCount(nsIMdbEnv* ev, mdb_count* outCount);
  nsresult Handle_GetStrongRefCount(nsIMdbEnv* ev, mdb_count* outCount);

  nsresult Handle_AddWeakRef(nsIMdbEnv* ev);
  nsresult Handle_AddStrongRef(nsIMdbEnv* ev);

  nsresult Handle_CutWeakRef(nsIMdbEnv* ev);
  nsresult Handle_CutStrongRef(nsIMdbEnv* ev);

  nsresult Handle_CloseMdbObject(nsIMdbEnv* ev);
  nsresult Handle_IsOpenMdbObject(nsIMdbEnv* ev, mdb_bool* outOpen);
  // } ----- end mdbObject style methods -----

 public:  // typesafe refcounting inlines calling inherited morkNode methods
  static void SlotWeakHandle(morkHandle* me, morkEnv* ev, morkHandle** ioSlot) {
    morkNode::SlotWeakNode((morkNode*)me, ev, (morkNode**)ioSlot);
  }

  static void SlotStrongHandle(morkHandle* me, morkEnv* ev,
                               morkHandle** ioSlot) {
    morkNode::SlotStrongNode((morkNode*)me, ev, (morkNode**)ioSlot);
  }
};

#define morkHandleFrame_kPadSlotCount 4

/*| morkHandleFrame: an object format used for allocating and maintaining
**| instances of morkHandle, with leading slots used to maintain this in a
**| linked list, and following slots to provide extra footprint that might
**| be needed by any morkHandle subclasses that include very little extra
**| space (by virtue of the fact that each morkHandle subclass is expected
**| to multiply inherit from another base class that has only abstract methods
**| for space overhead related only to some vtable representation).
|*/
class morkHandleFrame {
 public:
  morkLink mHandleFrame_Link;  // list storage without trampling Handle
  morkHandle mHandleFrame_Handle;
  mork_ip mHandleFrame_Padding[morkHandleFrame_kPadSlotCount];

 public:
  morkHandle* AsHandle() { return &mHandleFrame_Handle; }

  morkHandleFrame() {}  // actually, morkHandleFrame never gets constructed

 private:  // copying is not allowed
  morkHandleFrame(const morkHandleFrame& other);
  morkHandleFrame& operator=(const morkHandleFrame& other);
};

#define morkHandleFrame_kHandleOffset \
  mork_OffsetOf(morkHandleFrame, mHandleFrame_Handle)

#define morkHandle_AsHandleFrame(h) \
  ((h)->mHandle_Block,              \
   ((morkHandleFrame*)(((mork_u1*)(h)) - morkHandleFrame_kHandleOffset)))

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#endif /* _MORKHANDLE_ */