public void Execute (XPathNavigator input, XmlResolver resolver, XmlArgumentList args, XmlWriter writer)
{
if (staticContext == null)
throw new XmlQueryException ("Query string is not compiled.");
// Initialize event handler method info.
xqueryCommandOnMessageEventMethod = null;
XQueryContext ctx = new XQueryContext (new XQueryContextManager (staticContext, input, writer, resolver, args));
XPathSequence iter = new SingleItemIterator (input, ctx);
foreach (ExprSingle expr in staticContext.QueryBody)
expr.Serialize (iter);
}
public static object FnTrace (XQueryContext ctx, object value, string label)
{
if (value == null)
return new XPathEmptySequence (ctx);
XPathSequence seq = value as XPathSequence;
if (seq == null) {
XPathAtomicValue av = value as XPathAtomicValue;
if (av == null)
av = new XPathAtomicValue (value,
InternalPool.GetBuiltInType (
InternalPool.XmlTypeCodeFromRuntimeType (
value.GetType (), true)));
seq = new SingleItemIterator (av, ctx);
}
return new TracingIterator (seq, label);
}
private SingleItemIterator (SingleItemIterator other)
: base (other)
{
this.item = other.item;
this.current = other.current;
}
public override object Invoke (XPathSequence current, object [] args)
{
MethodInfo mi = methods [args.Length] as MethodInfo;
if (mi == null)
throw new ArgumentException ("The number of custom function parameter does not match with the registered method's signature.");
ParameterInfo [] prms = mi.GetParameters ();
// Use Evidence and PermissionSet.Demand() here
// before invoking external function.
Evidence e = current.Context.StaticContext.Evidence;
if (e != null)
SecurityManager.ResolvePolicy (e).Demand ();
Type t = prms.Length > 0 ? prms [0].ParameterType : null;
bool ctxSeq = mi.GetCustomAttributes (
typeof (XQueryFunctionContextAttribute),
false).Length > 0;
if (t == typeof (XQueryContext)) {
ArrayList pl = new ArrayList (args);
pl.Insert (0, current.Context);
args = pl.ToArray ();
}
else if (ctxSeq) {
ArrayList pl = new ArrayList (args);
pl.Insert (0, current);
args = pl.ToArray ();
}
if (args.Length != prms.Length)
throw new XmlQueryException (String.Format ("Argument numbers were different for function {0}. Signature requires {1} while actual call was {2}.", mi.Name, prms.Length, args.Length));
// If native parameter type is XPathSequence and the actual values are not, adjust them
for (int i = 0; i < args.Length; i++) {
if (prms [i].ParameterType == typeof (XPathSequence) && !(args [i] is XPathSequence)) {
XPathItem item = args [i] as XPathItem;
if (item == null)
item = args [i] == null ? null : new XPathAtomicValue (args [i], InternalPool.GetBuiltInType (InternalPool.XmlTypeCodeFromRuntimeType (prms [i].ParameterType, true)));
if (item == null)
args [i] = new XPathEmptySequence (current.Context);
else
args [i] = new SingleItemIterator (item, current.Context);
}
}
return mi.Invoke (null, args);
}
