1 files changed, 226 insertions, 0 deletions
diff --git a/db/mork/src/morkRow.h b/db/mork/src/morkRow.h
new file mode 100644
index 000000000..31fa20609
--- /dev/null
+++ b/db/mork/src/morkRow.h
@@ -0,0 +1,226 @@
+/* -*- 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 _MORKROW_
+#define _MORKROW_ 1
+
+#ifndef _MORK_
+#include "mork.h"
+#endif
+
+#ifndef _MORKCELL_
+#include "morkCell.h"
+#endif
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+class nsIMdbRow;
+class nsIMdbCell;
+#define morkDerived_kRow  /*i*/ 0x5277 /* ascii 'Rw' */
+
+#define morkRow_kMaxGcUses 0x0FF /* max for 8-bit unsigned int */
+#define morkRow_kMaxLength 0x0FFFF /* max for 16-bit unsigned int */
+#define morkRow_kMinusOneRid ((mork_rid) -1)
+
+#define morkRow_kTag 'r' /* magic signature for mRow_Tag */
+
+#define morkRow_kNotedBit   ((mork_u1) (1 << 0)) /* space has change notes */
+#define morkRow_kRewriteBit ((mork_u1) (1 << 1)) /* must rewrite all cells */
+#define morkRow_kDirtyBit   ((mork_u1) (1 << 2)) /* row has been changed */
+
+class morkRow{ // row of cells
+
+public: // state is public because the entire Mork system is private
+
+  morkRowSpace*   mRow_Space;  // mRow_Space->SpaceScope() is the row scope 
+  morkRowObject*  mRow_Object; // refcount & other state for object sharing
+  morkCell*       mRow_Cells;
+  mdbOid          mRow_Oid;
+  
+  mork_delta      mRow_Delta;   // space to note a single column change
+
+  mork_u2         mRow_Length;     // physical count of cells in mRow_Cells 
+  mork_u2         mRow_Seed;       // count changes in mRow_Cells structure
+
+  mork_u1         mRow_GcUses;  // persistent references from tables
+  mork_u1         mRow_Pad;     // for u1 alignment
+  mork_u1         mRow_Flags;   // one-byte flags slot
+  mork_u1         mRow_Tag;     // one-byte tag (need u4 alignment pad)
+
+public: // interpreting mRow_Delta
+  
+  mork_bool HasRowDelta() const { return ( mRow_Delta != 0 ); }
+  
+  void ClearRowDelta() { mRow_Delta = 0; }
+  
+  void SetRowDelta(mork_column inCol, mork_change inChange)
+  { morkDelta_Init(mRow_Delta, inCol, inChange); }
+  
+  mork_column  GetDeltaColumn() const { return morkDelta_Column(mRow_Delta); }
+  mork_change  GetDeltaChange() const { return morkDelta_Change(mRow_Delta); }
+
+public: // noting row changes
+
+  void NoteRowSetAll(morkEnv* ev);
+  void NoteRowSetCol(morkEnv* ev, mork_column inCol);
+  void NoteRowAddCol(morkEnv* ev, mork_column inCol);
+  void NoteRowCutCol(morkEnv* ev, mork_column inCol);
+
+public: // flags bit twiddling
+
+  void SetRowNoted() { mRow_Flags |= morkRow_kNotedBit; }
+  void SetRowRewrite() { mRow_Flags |= morkRow_kRewriteBit; }
+  void SetRowDirty() { mRow_Flags |= morkRow_kDirtyBit; }
+
+  void ClearRowNoted() { mRow_Flags &= (mork_u1) ~morkRow_kNotedBit; }
+  void ClearRowRewrite() { mRow_Flags &= (mork_u1) ~morkRow_kRewriteBit; }
+  void SetRowClean() { mRow_Flags = 0; mRow_Delta = 0; }
+  
+  mork_bool IsRowNoted() const
+  { return ( mRow_Flags & morkRow_kNotedBit ) != 0; }
+  
+  mork_bool IsRowRewrite() const
+  { return ( mRow_Flags & morkRow_kRewriteBit ) != 0; }
+   
+  mork_bool IsRowClean() const
+  { return ( mRow_Flags & morkRow_kDirtyBit ) == 0; }
+  
+  mork_bool IsRowDirty() const
+  { return ( mRow_Flags & morkRow_kDirtyBit ) != 0; }
+  
+  mork_bool IsRowUsed() const
+  { return mRow_GcUses != 0; }
+
+public: // other row methods
+  morkRow( ) { }
+  morkRow(const mdbOid* inOid) :mRow_Oid(*inOid) { }
+  void InitRow(morkEnv* ev, const mdbOid* inOid, morkRowSpace* ioSpace,
+    mork_size inLength, morkPool* ioPool);
+    // if inLength is nonzero, cells will be allocated from ioPool
+
+  morkRowObject* AcquireRowObject(morkEnv* ev, morkStore* ioStore);
+  nsIMdbRow* AcquireRowHandle(morkEnv* ev, morkStore* ioStore);
+  nsIMdbCell* AcquireCellHandle(morkEnv* ev, morkCell* ioCell,
+    mdb_column inColumn, mork_pos inPos);
+  
+  mork_u2 AddRowGcUse(morkEnv* ev);
+  mork_u2 CutRowGcUse(morkEnv* ev);
+
+  
+  mork_bool MaybeDirtySpaceStoreAndRow();
+
+public: // internal row methods
+
+  void cut_all_index_entries(morkEnv* ev);
+
+  // void cut_cell_from_space_index(morkEnv* ev, morkCell* ioCell);
+
+  mork_count CountOverlap(morkEnv* ev, morkCell* ioVector, mork_fill inFill);
+  // Count cells in ioVector that change existing cells in this row when
+  // ioVector is added to the row (as in TakeCells()).   This is the set
+  // of cells with the same columns in ioVector and mRow_Cells, which do
+  // not have exactly the same value in mCell_Atom, and which do not both
+  // have change status equal to morkChange_kCut (because cutting a cut
+  // cell still yields a cell that has been cut).  CountOverlap() also
+  // modifies the change attribute of any cell in ioVector to kDup when
+  // the change was previously kCut and the same column cell was found
+  // in this row with change also equal to kCut; this tells callers later
+  // they need not look for that cell in the row again on a second pass.
+
+  void MergeCells(morkEnv* ev, morkCell* ioVector,
+    mork_fill inVecLength, mork_fill inOldRowFill, mork_fill inOverlap);
+  // MergeCells() is the part of TakeCells() that does the insertion.
+  // inOldRowFill is the old value of mRow_Length, and inOverlap is the
+  // number of cells in the intersection that must be updated.
+
+  void TakeCells(morkEnv* ev, morkCell* ioVector, mork_fill inVecLength,
+    morkStore* ioStore);
+
+  morkCell* NewCell(morkEnv* ev, mdb_column inColumn, mork_pos* outPos,
+    morkStore* ioStore);
+  morkCell* GetCell(morkEnv* ev, mdb_column inColumn, mork_pos* outPos) const;
+  morkCell* CellAt(morkEnv* ev, mork_pos inPos) const;
+
+  mork_aid GetCellAtomAid(morkEnv* ev, mdb_column inColumn) const;
+  // GetCellAtomAid() finds the cell with column inColumn, and sees if the
+  // atom has a token ID, and returns the atom's ID if there is one.  Or
+  // else zero is returned if there is no such column, or no atom, or if
+  // the atom has no ID to return.  This method is intended to support
+  // efficient updating of column indexes for rows in a row space.
+
+public: // external row methods
+
+  void DirtyAllRowContent(morkEnv* ev);
+
+  morkStore* GetRowSpaceStore(morkEnv* ev) const;
+
+  void AddColumn(morkEnv* ev, mdb_column inColumn,
+    const mdbYarn* inYarn, morkStore* ioStore);
+
+  morkAtom* GetColumnAtom(morkEnv* ev, mdb_column inColumn);
+
+  void NextColumn(morkEnv* ev, mdb_column* ioColumn, mdbYarn* outYarn);
+
+  void SeekColumn(morkEnv* ev, mdb_pos inPos, 
+	  mdb_column* outColumn, mdbYarn* outYarn);
+
+  void CutColumn(morkEnv* ev, mdb_column inColumn);
+
+  morkRowCellCursor* NewRowCellCursor(morkEnv* ev, mdb_pos inPos);
+  
+  void EmptyAllCells(morkEnv* ev);
+  void AddRow(morkEnv* ev, const morkRow* inSourceRow);
+  void SetRow(morkEnv* ev, const morkRow* inSourceRow);
+  void CutAllColumns(morkEnv* ev);
+
+  void OnZeroRowGcUse(morkEnv* ev);
+  // OnZeroRowGcUse() is called when CutRowGcUse() returns zero.
+
+public: // dynamic typing
+
+  mork_bool IsRow() const { return mRow_Tag == morkRow_kTag; }
+
+public: // hash and equal
+
+  mork_u4 HashRow() const
+  {
+    return (mRow_Oid.mOid_Scope << 16) ^ mRow_Oid.mOid_Id;
+  }
+
+  mork_bool EqualRow(const morkRow* ioRow) const
+  {
+    return
+    (
+      ( mRow_Oid.mOid_Scope == ioRow->mRow_Oid.mOid_Scope ) 
+      && ( mRow_Oid.mOid_Id == ioRow->mRow_Oid.mOid_Id )
+    );
+  }
+
+  mork_bool EqualOid(const mdbOid* ioOid) const
+  {
+    return
+    (
+      ( mRow_Oid.mOid_Scope == ioOid->mOid_Scope ) 
+      && ( mRow_Oid.mOid_Id == ioOid->mOid_Id )
+    );
+  }
+
+public: // errors
+  static void ZeroColumnError(morkEnv* ev);
+  static void LengthBeyondMaxError(morkEnv* ev);
+  static void NilCellsError(morkEnv* ev);
+  static void NonRowTypeError(morkEnv* ev);
+  static void NonRowTypeWarning(morkEnv* ev);
+  static void GcUsesUnderflowWarning(morkEnv* ev);
+
+private: // copying is not allowed
+  morkRow(const morkRow& other);
+  morkRow& operator=(const morkRow& other);
+};
+
+//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#endif /* _MORKROW_ */
+