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Update Witness.cpp #2

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33 changes: 21 additions & 12 deletions src/Witness.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,50 +3,59 @@
WitnessPlan::WitnessPlan (char const * const name, Plan * const input)
: Plan (name), _input (input)
{
TRACE (TRACE_VAL);
} // WitnessPlan::WitnessPlan
TRACE (true);
} // WitnessPlan::WitnessPlan constructor

WitnessPlan::~WitnessPlan ()
{
TRACE (TRACE_VAL);
TRACE (true);
delete _input;
} // WitnessPlan::~WitnessPlan
} // WitnessPlan::~WitnessPlan destructor

Iterator * WitnessPlan::init () const
{
TRACE (TRACE_VAL);
TRACE (true);
return new WitnessIterator (this);
} // WitnessPlan::init

WitnessIterator::WitnessIterator (WitnessPlan const * const plan) :
_plan (plan), _input (plan->_input->init ()),
_rows (0)
_rows (0) , _parity(0) , _inversions(0), _hasPrevious(false) // initialise parity
{
TRACE (TRACE_VAL);
TRACE (true);
} // WitnessIterator::WitnessIterator

WitnessIterator::~WitnessIterator ()
{
TRACE (TRACE_VAL);
TRACE (true);

delete _input;

traceprintf ("%s witnessed %lu rows\n",
traceprintf ("%s witnessed %lu rows with parity %lu and %lu inversions\n",
_plan->_name,
(unsigned long) (_rows));
(unsigned long) (_rows),
(unsigned long) (_parity),
(unsigned long) (_inversions));
} // WitnessIterator::~WitnessIterator

bool WitnessIterator::next (Row & row)
{
TRACE (TRACE_VAL);
TRACE (true);

if ( ! _input->next (row)) return false;
++ _rows;
_parity ^= row.getId();
// Compute XOR parity (assuming `row.id` is the attribute)
if (_hasPrevious && _previousRow.getId() > row.getId()) {
++_inversions;
}
_previousRow = row;
_hasPrevious = true;
return true;
} // WitnessIterator::next

void WitnessIterator::free (Row & row)
{
TRACE (TRACE_VAL);
TRACE (true);
_input->free (row);
} // WitnessIterator::free