public void setDestRef(QuestionDef q)
{
destRef = FormInstance.unpackReference(q.Bind).clone();
if (copyMode)
{
destRef.add(copyRef.getNameLast(), TreeReference.INDEX_UNBOUND);
}
}
/**
* translate an xpath path reference into a TreeReference
* TreeReferences only support a subset of true xpath paths; restrictions are:
* simple child name tests 'child::name', '.', and '..' allowed only
* no predicates
* all '..' steps must come before anything else
*/
public TreeReference getReference(Boolean allowPredicates)
{
TreeReference ref_ = new TreeReference();
Boolean parentsAllowed;
switch (init_context)
{
case XPathPathExpr.INIT_CONTEXT_ROOT:
ref_.setRefLevel(TreeReference.REF_ABSOLUTE);
parentsAllowed = false;
break;
case XPathPathExpr.INIT_CONTEXT_RELATIVE:
ref_.setRefLevel(0);
parentsAllowed = true;
break;
default: throw new XPathUnsupportedException("filter expression");
}
for (int i = 0; i < steps.Length; i++)
{
XPathStep step = steps[i];
if (!allowPredicates && step.predicates.Length > 0)
{
throw new XPathUnsupportedException("predicates");
}
if (step.axis == XPathStep.AXIS_SELF)
{
if (step.test != XPathStep.TEST_TYPE_NODE)
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
else if (step.axis == XPathStep.AXIS_PARENT)
{
if (!parentsAllowed || step.test != XPathStep.TEST_TYPE_NODE)
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
else
{
ref_.incrementRefLevel();
}
}
else if (step.axis == XPathStep.AXIS_ATTRIBUTE)
{
if (step.test == XPathStep.TEST_NAME)
{
ref_.add(step.name.ToString(), TreeReference.INDEX_ATTRIBUTE);
parentsAllowed = false;
//TODO: Can you step back from an attribute, or should this always be
//the last step?
}
else
{
throw new XPathUnsupportedException("attribute step other than 'attribute::name");
}
}
else if (step.axis == XPathStep.AXIS_CHILD)
{
if (step.test == XPathStep.TEST_NAME)
{
ref_.add(step.name.ToString(), TreeReference.INDEX_UNBOUND);
parentsAllowed = false;
}
else if (step.test == XPathStep.TEST_NAME_WILDCARD)
{
ref_.add(TreeReference.NAME_WILDCARD, TreeReference.INDEX_UNBOUND);
parentsAllowed = false;
}
else
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
else
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
return(ref_);
}