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morkCell.cpp
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00037 
00038 #ifndef _MDB_
00039 #include "mdb.h"
00040 #endif
00041 
00042 #ifndef _MORK_
00043 #include "mork.h"
00044 #endif
00045 
00046 #ifndef _MORKNODE_
00047 #include "morkNode.h"
00048 #endif
00049 
00050 #ifndef _MORKSTORE_
00051 #include "morkStore.h"
00052 #endif
00053 
00054 #ifndef _MORKPOOL_
00055 #include "morkPool.h"
00056 #endif
00057 
00058 #ifndef _MORKENV_
00059 #include "morkEnv.h"
00060 #endif
00061 
00062 #ifndef _MORKCELL_
00063 #include "morkCell.h"
00064 #endif
00065 
00066 //3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
00067 
00068 void
00069 morkCell::SetYarn(morkEnv* ev, const mdbYarn* inYarn, morkStore* ioStore)
00070 {
00071   morkAtom* atom = ioStore->YarnToAtom(ev, inYarn, PR_TRUE /* create */);
00072   if ( atom )
00073     this->SetAtom(ev, atom, ioStore->StorePool()); // refcounts atom
00074 }
00075 
00076 void
00077 morkCell::GetYarn(morkEnv* ev, mdbYarn* outYarn) const
00078 {
00079   MORK_USED_1(ev);
00080   mCell_Atom->GetYarn(outYarn);
00081 }
00082 
00083 void
00084 morkCell::AliasYarn(morkEnv* ev, mdbYarn* outYarn) const
00085 {
00086   MORK_USED_1(ev);
00087   mCell_Atom->AliasYarn(outYarn);
00088 }
00089   
00090   
00091 void
00092 morkCell::SetCellClean()
00093 {
00094   mork_column col = this->GetColumn();
00095   this->SetColumnAndChange(col, morkChange_kNil);
00096 }
00097   
00098 void
00099 morkCell::SetCellDirty()
00100 {
00101   mork_column col = this->GetColumn();
00102   this->SetColumnAndChange(col, morkChange_kAdd);
00103 }
00104 
00105 void
00106 morkCell::SetAtom(morkEnv* ev, morkAtom* ioAtom, morkPool* ioPool)
00107   // SetAtom() "acquires" the new ioAtom if non-nil, by calling AddCellUse()
00108   // to increase the refcount, and puts ioAtom into mCell_Atom.  If the old
00109   // atom in mCell_Atom is non-nil, then it is "released" first by a call to
00110   // CutCellUse(), and if the use count then becomes zero, then the old atom
00111   // is deallocated by returning it to the pool ioPool.  (And this is
00112   // why ioPool is a parameter to this method.)  Note that ioAtom can be nil
00113   // to cause the cell to refer to nothing, and the old atom in mCell_Atom
00114   // can also be nil, and all the atom refcounting is handled correctly.
00115   //
00116   // Note that if ioAtom was just created, it typically has a zero use count
00117   // before calling SetAtom().  But use count is one higher after SetAtom().
00118 {
00119   morkAtom* oldAtom = mCell_Atom;
00120   if ( oldAtom != ioAtom ) // ioAtom is not already installed in this cell?
00121   {
00122     if ( oldAtom )
00123     {
00124       mCell_Atom = 0;
00125       if ( oldAtom->CutCellUse(ev) == 0 )
00126       {
00127       // this was zapping atoms still in use - comment out until davidmc
00128       // can figure out a better fix.
00129 //        if ( ioPool )
00130 //        {
00131 //          if ( oldAtom->IsBook() )
00132 //            ((morkBookAtom*) oldAtom)->CutBookAtomFromSpace(ev);
00133             
00134 //          ioPool->ZapAtom(ev, oldAtom);
00135 //        }
00136 //        else
00137 //          ev->NilPointerError();
00138       }
00139     }
00140     if ( ioAtom )
00141       ioAtom->AddCellUse(ev);
00142       
00143     mCell_Atom = ioAtom;
00144   }
00145 }
00146 
00147 //3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789