private int process_DDFP(VTDNav vn)
{
AutoPilot ap;
bool b = false, b1 = false;
//int contextSize;
Predicate t = null;
int result;
switch (state)
{
case START:
case FORWARD:
if (vn.atTerminal)
{
if (state == START)
state = END;
else
{
// no need to set_ft to true
// no need to resetP
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
break;
}
t = currentStep.p;
while (t != null)
{
if (t.requireContextSize())
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize = i;
}
t = t.nextP;
}
if (b1)
{
if (state == START)
state = END;
else
{
currentStep = currentStep.PrevStep;
state = BACKWARD;
}
break;
}
System.String helper = null;
if (currentStep.nt.testType == NodeTest.NODE)
{
helper = "*";
}
else
{
helper = currentStep.nt.nodeName;
}
if (currentStep.o == null)
currentStep.o = ap = new AutoPilot(vn);
else
{
ap = (AutoPilot) currentStep.o;
ap.bind(vn);
}
if (currentStep.get_ft() == true)
{
if (currentStep.axis_type == AxisType.DESCENDANT_OR_SELF)
if (currentStep.nt.testType == NodeTest.NODE)
ap.Special = true;
else
ap.Special = false;
//currentStep.o = ap = new AutoPilot(vn);
if (currentStep.axis_type == AxisType.DESCENDANT_OR_SELF)
ap.selectElement(helper);
else if (currentStep.axis_type == AxisType.DESCENDANT)
ap.selectElement_D(helper);
else if (currentStep.axis_type == AxisType.PRECEDING)
ap.selectElement_P(helper);
else
ap.selectElement_F(helper);
currentStep.set_ft(false);
}
if (state == START)
state = END;
vn.push2(); // not the most efficient. good for now
//System.out.println(" --++ push in //");
b = false;
while (ap.iterate())
{
if (currentStep.evalPredicates(vn))
{
b = true;
break;
}
}
if (b == false)
{
vn.pop2();
//System.out.println(" --++ pop in //");
currentStep.set_ft(true);
currentStep.resetP(vn);
if (state == FORWARD)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
}
else
{
if (currentStep.NextStep != null)
{
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
//vn.pop();
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
break;
case END:
currentStep = null;
// reset();
return - 1;
case BACKWARD:
//currentStep = currentStep.getPrevStep();
ap = (AutoPilot) currentStep.o;
//vn.push();
b = false;
while (ap.iterate())
{
if (currentStep.evalPredicates(vn))
{
b = true;
break;
}
}
if (b == false)
{
vn.pop2();
currentStep.set_ft(true);
currentStep.resetP(vn);
//System.out.println(" --++ pop in //");
if (currentStep.PrevStep != null)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
else
state = END;
}
else
{
if (currentStep.NextStep != null)
{
//vn.push();
//System.out.println(" --++ push in //");
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
break;
case TERMINAL:
ap = (AutoPilot) currentStep.o;
b = false;
while (ap.iterate())
{
if (currentStep.evalPredicates(vn))
{
b = true;
break;
}
}
if (b == true)
{
if (currentStep.evalPredicates(vn))
{
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
else if (currentStep.PrevStep == null)
{
currentStep.resetP(vn);
vn.pop2();
state = END;
}
else
{
vn.pop2();
currentStep.set_ft(true);
currentStep.resetP(vn);
//System.out.println(" --++ pop in //");
state = BACKWARD;
//currentStep.ft = true;
currentStep = currentStep.PrevStep;
}
break;
default:
throw new XPathEvalException("unknown state");
}
return - 2;
}
private int process_attribute(VTDNav vn)
{
AutoPilot ap = null;
bool b1 = false;
//int contextSize;
Predicate t = null;
//int result;
int temp;
switch (state)
{
case START:
case FORWARD:
t = currentStep.p;
while (t != null)
{
if (t.requireContextSize())
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize = i;
}
t = t.nextP;
}
if (b1)
{
if (state == FORWARD)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
else
state = END;
break;
}
if (vn.AtTerminal == true)
{
if (state == START)
state = END;
else
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
}
else
{
if (currentStep.get_ft() == true)
{
if (currentStep.o == null)
currentStep.o = ap = new AutoPilot(vn);
else
{
ap = (AutoPilot) currentStep.o;
ap.bind(vn);
//ap.set_ft(true);
}
if (currentStep.nt.localName != null)
ap.selectAttrNS(currentStep.nt.URL, currentStep.nt.localName);
else
ap.selectAttr(currentStep.nt.nodeName);
currentStep.set_ft(false);
}
if (state == START)
state = END;
vn.AtTerminal = true;
while ((temp = ap.iterateAttr()) != - 1)
{
if (currentStep.evalPredicates(vn))
{
break;
}
}
if (temp == - 1)
{
currentStep.set_ft(true);
currentStep.resetP(vn);
vn.AtTerminal = false;
if (state == FORWARD)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
}
else
{
if (currentStep.NextStep != null)
{
vn.LN = temp;
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
//vn.pop();
state = TERMINAL;
if (isUnique(temp))
{
vn.LN = temp;
return temp;
}
}
}
}
break;
case END:
currentStep = null;
// reset();
return - 1;
case BACKWARD:
ap = (AutoPilot) currentStep.o;
//vn.push();
while ((temp = ap.iterateAttr()) != - 1)
{
if (currentStep.evalPredicates(vn))
{
break;
}
}
if (temp == - 1)
{
currentStep.set_ft(true);
currentStep.resetP(vn);
vn.AtTerminal = false;
if (currentStep.PrevStep != null)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
else
state = END;
}
else
{
if (currentStep.NextStep != null)
{
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
state = TERMINAL;
if (isUnique(temp))
{
vn.LN = temp;
return temp;
}
}
}
break;
case TERMINAL:
ap = (AutoPilot) currentStep.o;
while ((temp = ap.iterateAttr()) != - 1)
{
if (currentStep.evalPredicates(vn))
{
break;
}
}
if (temp != - 1)
if (isUnique(temp))
{
vn.LN = temp;
return temp;
}
vn.AtTerminal = false;
currentStep.resetP(vn);
if (currentStep.PrevStep == null)
{
currentStep.set_ft(true);
state = END;
}
else
{
state = BACKWARD;
currentStep.set_ft(true);
currentStep = currentStep.PrevStep;
}
break;
default:
throw new XPathEvalException("unknown state");
}
return - 2;
}