public int computeContextSize(Predicate p, VTDNav vn){
bool b = false;
Predicate tp = null;
int i = 0;
AutoPilot ap;
switch(currentStep.axis_type){
case AxisType.CHILD:
if (currentStep.nt.testType != NodeTest.TEXT){
b = vn.toElement(VTDNav.FIRST_CHILD);
if (b) {
do {
if (currentStep.eval(vn, p)) {
i++;
}
} while (vn.toElement(VTDNav.NS));
vn.toElement(VTDNav.PARENT);
currentStep.resetP(vn,p);
return i;
} else
return 0;
}else {
TextIter ti = new TextIter();
ti.touch(vn);
while((ti.getNext())!=-1){
if (currentStep.evalPredicates(vn,p)){
i++;
}
}
currentStep.resetP(vn,p);
return i;
}
case AxisType.DESCENDANT_OR_SELF:
case AxisType.DESCENDANT:
case AxisType.PRECEDING:
case AxisType.FOLLOWING:
String helper = null;
if (currentStep.nt.testType == NodeTest.NODE){
helper = "*";
}else {
helper = currentStep.nt.nodeName;
}
ap = new AutoPilot(vn);
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)
if (currentStep.nt.localName!=null)
ap.selectElementNS(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement(helper);
else if (currentStep.axis_type == AxisType.DESCENDANT)
if (currentStep.nt.localName!=null)
ap.selectElementNS_D(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement_D(helper);
else if (currentStep.axis_type == AxisType.PRECEDING)
if (currentStep.nt.localName!=null)
ap.selectElementNS_P(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement_P(helper);
else
if (currentStep.nt.localName!=null)
ap.selectElementNS_F(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement_F(helper);
vn.push2();
while(ap.iterate()){
if (currentStep.evalPredicates(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.PARENT:
vn.push2();
i = 0;
if (vn.toElement(VTDNav.PARENT)){
if (currentStep.eval(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.ANCESTOR:
vn.push2();
i = 0;
while (vn.toElement(VTDNav.PARENT)) {
if (currentStep.eval(vn, p)) {
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.ANCESTOR_OR_SELF:
vn.push2();
i = 0;
do {
if (currentStep.eval(vn, p)) {
i++;
}
}while(vn.toElement(VTDNav.PARENT));
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.SELF:
i = 0;
if (vn.toElement(VTDNav.PARENT)){
if (currentStep.eval(vn,p)){
i++;
}
}
currentStep.resetP(vn,p);
return i;
case AxisType.FOLLOWING_SIBLING:
vn.push2();
while(vn.toElement(VTDNav.NEXT_SIBLING)){
if (currentStep.eval(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.PRECEDING_SIBLING:
vn.push2();
while(vn.toElement(VTDNav.PREV_SIBLING)){
if (currentStep.eval(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.ATTRIBUTE:
ap = new AutoPilot(vn);
if (currentStep.nt.localName!=null)
ap.selectAttrNS(currentStep.nt.URL,
currentStep.nt.localName);
else
ap.selectAttr(currentStep.nt.nodeName);
i = 0;
while(ap.iterateAttr()!=-1){
if (currentStep.evalPredicates(vn,p)){
i++;
}
}
currentStep.resetP(vn,p);
return i;
default:
throw new XPathEvalException("axis not supported");
}
//return 8;
}
