private static AdkXPathStep ParseStep(string nodeName)
{
AdkXPathStep step;
if (nodeName.StartsWith("@"))
{
step = new AdkXPathStep(AdkAxisType.Attribute, new AdkNodeNameTest(nodeName.Substring(1)));
}
else
{
step = new AdkXPathStep(AdkAxisType.Child, new AdkNodeNameTest(nodeName));
}
return(step);
}
private void AssertStep(AdkXPathStep step, String name, String singePredicateName, object singlePredicateValue)
{
Assert.AreEqual(name, ((AdkNodeNameTest) step.NodeTest).NodeName);
Assert.IsNotNull(step.Predicates);
Assert.AreEqual(1, step.Predicates.Length);
Assert.IsInstanceOfType(typeof (AdkEqualOperation), step.Predicates[0]);
AdkExpression[] components = ((AdkEqualOperation) step.Predicates[0]).Arguments;
Assert.AreEqual(2, components.Length);
Assert.IsInstanceOfType(typeof (AdkLocPath), components[0]);
AdkLocPath lp = (AdkLocPath) components[0];
AdkNodeNameTest attrName = (AdkNodeNameTest) lp.Steps[0].NodeTest;
Assert.AreEqual(singePredicateName, attrName.NodeName);
object value = components[1].ComputeValue(null);
Assert.AreEqual(singlePredicateValue, value);
}
private static AdkExpression ParseSimplePredicate(Fragment predicateFragment)
{
Fragment[] predicateParts = predicateFragment.Split("=");
if (predicateParts.Length != 2)
{
// This is a fragment type we don't support. Just return it as
// a Custom function.
return(ParseExtensionFunction(predicateFragment));
}
String nodeName = predicateParts[0].ToString();
String comparedValue = predicateParts[1].ToString();
AdkStaticValue c = ParseConstant(comparedValue);
AdkXPathStep step = ParseStep(nodeName);
return(new AdkEqualOperation(new AdkLocPath(false, step), c));
}
/// <summary>
/// Evaluates the current step in the path. If the path represented by the step does not
/// exist, NULL is returned. Otherwise, the node found is returned unless the special adk:X()
/// marker function is contained in the predicate expression, which signals that the specified
/// repeatable element should always be created
/// </summary>
/// <param name="navigator"></param>
/// <param name="parentPath"></param>
/// <param name="currentStep"></param>
/// <returns></returns>
private INodePointer FindChild( XPathNavigator navigator, StringBuilder parentPath, AdkXPathStep currentStep )
{
String currentStepxPath = currentStep.ToString();
if ( currentStep.IsContextDependent() )
{
// If the special 'adk:x()' function is present, that means to always
// create the element, therefore, return null as if it were not found
if ( currentStepxPath.IndexOf( "adk:x" ) > -1 )
{
return null;
}
}
navigator.MoveToRoot();
SifXPathNavigator sifNav =
(SifXPathNavigator) navigator.SelectSingleNode( parentPath + "/" + currentStepxPath );
if ( sifNav != null )
{
return sifNav.UnderlyingPointer;
}
return null;
}
