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/* -*- 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 _MDB_
#include "mdb.h"
#endif
#ifndef _MORK_
#include "mork.h"
#endif
#ifndef _MORKNODE_
#include "morkNode.h"
#endif
#ifndef _MORKSTORE_
#include "morkStore.h"
#endif
#ifndef _MORKPOOL_
#include "morkPool.h"
#endif
#ifndef _MORKENV_
#include "morkEnv.h"
#endif
#ifndef _MORKCELL_
#include "morkCell.h"
#endif
//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
void
morkCell::SetYarn(morkEnv* ev, const mdbYarn* inYarn, morkStore* ioStore)
{
morkAtom* atom = ioStore->YarnToAtom(ev, inYarn, true /* create */);
if ( atom )
this->SetAtom(ev, atom, ioStore->StorePool()); // refcounts atom
}
void
morkCell::GetYarn(morkEnv* ev, mdbYarn* outYarn) const
{
MORK_USED_1(ev);
morkAtom::GetYarn(mCell_Atom, outYarn);
}
void
morkCell::AliasYarn(morkEnv* ev, mdbYarn* outYarn) const
{
MORK_USED_1(ev);
morkAtom::AliasYarn(mCell_Atom, outYarn);
}
void
morkCell::SetCellClean()
{
mork_column col = this->GetColumn();
this->SetColumnAndChange(col, morkChange_kNil);
}
void
morkCell::SetCellDirty()
{
mork_column col = this->GetColumn();
this->SetColumnAndChange(col, morkChange_kAdd);
}
void
morkCell::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().
{
morkAtom* oldAtom = mCell_Atom;
if ( oldAtom != ioAtom ) // ioAtom is not already installed in this cell?
{
if ( oldAtom )
{
mCell_Atom = 0;
if ( oldAtom->CutCellUse(ev) == 0 )
{
// this was zapping atoms still in use - comment out until davidmc
// can figure out a better fix.
// if ( ioPool )
// {
// if ( oldAtom->IsBook() )
// ((morkBookAtom*) oldAtom)->CutBookAtomFromSpace(ev);
// ioPool->ZapAtom(ev, oldAtom);
// }
// else
// ev->NilPointerError();
}
}
if ( ioAtom )
ioAtom->AddCellUse(ev);
mCell_Atom = ioAtom;
}
}
//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
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