1 files changed, 89 insertions, 0 deletions
diff --git a/db/mork/src/morkCell.h b/db/mork/src/morkCell.h
new file mode 100644
index 000000000..50642d916
--- /dev/null
+++ b/db/mork/src/morkCell.h
@@ -0,0 +1,89 @@
+/* -*- 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 _MORKCELL_
+#define _MORKCELL_ 1
+
+#ifndef _MORK_
+#include "mork.h"
+#endif
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#define morkDelta_kShift 8 /* 8 bit shift */
+#define morkDelta_kChangeMask 0x0FF /* low 8 bit mask */
+#define morkDelta_kColumnMask (~ (mork_column) morkDelta_kChangeMask)
+#define morkDelta_Init(self,cl,ch) ((self) = ((cl)<<morkDelta_kShift) | (ch))
+#define morkDelta_Change(self) ((mork_change) ((self) & morkDelta_kChangeMask))
+#define morkDelta_Column(self) ((self) >> morkDelta_kShift)
+
+class morkCell { // minimal cell format
+
+public:
+  mork_delta   mCell_Delta;   // encoding of both column and change
+  morkAtom*    mCell_Atom;    // content in this cell
+  
+public:
+  morkCell() : mCell_Delta( 0 ), mCell_Atom( 0 ) { }
+
+  morkCell(const morkCell& c)
+  : mCell_Delta( c.mCell_Delta ), mCell_Atom( c.mCell_Atom ) { }
+  
+  // note if ioAtom is non-nil, caller needs to call ioAtom->AddCellUse():
+  morkCell(mork_column inCol, mork_change inChange, morkAtom* ioAtom)
+  {
+    morkDelta_Init(mCell_Delta, inCol,inChange);
+    mCell_Atom = ioAtom;
+  }
+
+  // note if ioAtom is non-nil, caller needs to call ioAtom->AddCellUse():
+  void Init(mork_column inCol, mork_change inChange, morkAtom* ioAtom)
+  {
+    morkDelta_Init(mCell_Delta,inCol,inChange);
+    mCell_Atom = ioAtom;
+  }
+  
+  mork_column  GetColumn() const { return morkDelta_Column(mCell_Delta); }
+  mork_change  GetChange() const { return morkDelta_Change(mCell_Delta); }
+  
+  mork_bool IsCellClean() const { return GetChange() == morkChange_kNil; }
+  mork_bool IsCellDirty() const { return GetChange() != morkChange_kNil; }
+
+  void SetCellClean(); // set change to kNil
+  void SetCellDirty(); // set change to kAdd
+  
+  void SetCellColumnDirty(mork_column inCol)
+  { this->SetColumnAndChange(inCol, morkChange_kAdd); }
+  
+  void SetCellColumnClean(mork_column inCol)
+  { this->SetColumnAndChange(inCol, morkChange_kNil); }
+  
+  void         SetColumnAndChange(mork_column inCol, mork_change inChange)
+  { morkDelta_Init(mCell_Delta, inCol, inChange); }
+    
+  morkAtom*  GetAtom() { return mCell_Atom; }
+  
+  void       SetAtom(morkEnv* ev, morkAtom* ioAtom, morkPool* ioPool);
+  // SetAtom() "acquires" the new ioAtom if non-nil, by calling AddCellUse()
+  // to increase the refcount, and puts ioAtom into mCell_Atom.  If the old
+  // atom in mCell_Atom is non-nil, then it is "released" first by a call to
+  // CutCellUse(), and if the use count then becomes zero, then the old atom
+  // is deallocated by returning it to the pool ioPool.  (And this is
+  // why ioPool is a parameter to this method.)  Note that ioAtom can be nil
+  // to cause the cell to refer to nothing, and the old atom in mCell_Atom
+  // can also be nil, and all the atom refcounting is handled correctly.
+  //
+  // Note that if ioAtom was just created, it typically has a zero use count
+  // before calling SetAtom().  But use count is one higher after SetAtom().
+  
+  void       SetYarn(morkEnv* ev, const mdbYarn* inYarn, morkStore* ioStore);
+  
+  void       AliasYarn(morkEnv* ev, mdbYarn* outYarn) const;
+  void       GetYarn(morkEnv* ev, mdbYarn* outYarn) const;
+};
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#endif /* _MORKCELL_ */