summaryrefslogtreecommitdiffstats
path: root/db/mork/src/morkCell.h
diff options
context:
space:
mode:
Diffstat (limited to 'db/mork/src/morkCell.h')
-rw-r--r--db/mork/src/morkCell.h89
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_ */