protected override XPathItem NextItem()
{
if (_index <= _max)
{
if (_item == null)
_item = new XQueryItem();
_item.RawValue = _index;
_index++;
return _item;
}
return null;
}
public override XPathItem Clone()
{
XQueryItem clone = new XQueryItem();
clone._value = _value;
clone._xmlType = _xmlType;
return clone;
}
public static object CastTo([Implict] Executive engine, object value, XQuerySequenceType destType, Type exprType)
{
XQueryContext context = (XQueryContext)engine.Owner;
if (destType == XQuerySequenceType.Item)
return value;
if (value == Undefined.Value)
{
if (destType.Cardinality == XmlTypeCardinality.ZeroOrMore)
return EmptyIterator.Shared;
if (destType.TypeCode != XmlTypeCode.None && destType.Cardinality != XmlTypeCardinality.ZeroOrOne)
throw new XQueryException(Properties.Resources.XPTY0004, "empty-sequence()", destType);
return Undefined.Value;
}
if (destType.Cardinality == XmlTypeCardinality.One ||
destType.Cardinality == XmlTypeCardinality.ZeroOrOne)
{
XPathItem res;
XQueryNodeIterator iter = value as XQueryNodeIterator;
if (iter != null)
{
iter = iter.Clone();
if (!iter.MoveNext())
{
if (destType.TypeCode != XmlTypeCode.None &&
(destType.Cardinality == XmlTypeCardinality.One || destType.Cardinality == XmlTypeCardinality.OneOrMore))
throw new XQueryException(Properties.Resources.XPTY0004, "empty-sequence()", destType);
return Undefined.Value;
}
if (exprType != null && exprType != typeof(System.String))
{
if ((destType.TypeCode == XmlTypeCode.QName && iter.Current.XmlType.TypeCode != XmlTypeCode.QName) ||
(destType.TypeCode == XmlTypeCode.Notation && iter.Current.XmlType.TypeCode != XmlTypeCode.Notation))
throw new XQueryException(Properties.Resources.XPTY0004_CAST, destType);
}
res = iter.Current.ChangeType(destType, context);
if (iter.MoveNext())
throw new XQueryException(Properties.Resources.MoreThanOneItem);
if (destType.IsNode)
return res;
return res.TypedValue;
}
XPathItem item = value as XPathItem;
if (item == null)
item = new XQueryItem(value);
if (exprType != null && exprType != typeof(System.String))
{
if ((destType.TypeCode == XmlTypeCode.QName && item.XmlType.TypeCode != XmlTypeCode.QName) ||
(destType.TypeCode == XmlTypeCode.Notation && item.XmlType.TypeCode != XmlTypeCode.Notation))
throw new XQueryException(Properties.Resources.XPTY0004_CAST, destType);
}
res = item.ChangeType(destType, context);
if (destType.IsNode)
return res;
return res.TypedValue;
}
else
return new NodeIterator(XPathFactory.ConvertIterator(XQueryNodeIterator.Create(value), destType, context));
}
public static bool InstanceOf([Implict] Executive engine, object value, XQuerySequenceType destType)
{
XQueryContext context = (XQueryContext)engine.Owner;
if (value == Undefined.Value)
return destType.Cardinality == XmlTypeCardinality.ZeroOrOne ||
destType.Cardinality == XmlTypeCardinality.ZeroOrMore;
if (value == null)
value = CoreServices.Generation.RuntimeOps.False;
XQueryNodeIterator iter = value as XQueryNodeIterator;
if (iter != null)
{
int num = 0;
foreach (XPathItem item in iter)
{
if (num == 1)
{
if (destType.Cardinality == XmlTypeCardinality.ZeroOrOne ||
destType.Cardinality == XmlTypeCardinality.One)
return false;
}
if (!destType.Match(item, context))
return false;
num++;
}
if (num == 0)
{
if (destType.TypeCode != XmlTypeCode.None && (destType.Cardinality == XmlTypeCardinality.One ||
destType.Cardinality == XmlTypeCardinality.OneOrMore))
return false;
}
return true;
}
else
{
if (destType.ItemType == value.GetType())
return true;
XPathItem item = value as XPathItem;
if (item == null)
item = new XQueryItem(value);
return destType.Match(item, context);
}
}
private IEnumerable<XPathItem> CreateEnumerator(object[] args, MemoryPool pool,
XQueryExprBase expr, XQueryNodeIterator baseIter)
{
XQueryNodeIterator iter = baseIter.Clone();
XQueryExpr numexpr = expr as XQueryExpr;
if (numexpr != null && numexpr.m_expr.Length == 1
&& numexpr.m_expr[0] is Integer)
{
Integer pos = (Integer)numexpr.m_expr[0];
foreach (XPathItem item in iter)
{
if (pos == 1)
{
yield return item;
break;
}
else
pos--;
}
}
else
{
ContextProvider provider = new ContextProvider(iter);
object res = Undefined.Value;
while (iter.MoveNext())
{
if (m_contextSensitive || res == Undefined.Value)
res = expr.Execute(provider, args, pool);
if (res == Undefined.Value)
{
if (!m_contextSensitive)
break;
continue;
}
XQueryNodeIterator iter2 = res as XQueryNodeIterator;
XPathItem item;
if (iter2 != null)
{
iter2 = iter2.Clone();
if (!iter2.MoveNext())
continue;
item = iter2.Current.Clone();
if (!item.IsNode && iter2.MoveNext())
throw new XQueryException(Properties.Resources.FORG0006, "fn:boolean()",
new XQuerySequenceType(XmlTypeCode.AnyAtomicType, XmlTypeCardinality.OneOrMore));
}
else
{
item = res as XPathItem;
if (item == null)
item = new XQueryItem(res);
}
if (item.IsNode)
yield return iter.Current;
else
{
if (ValueProxy.IsNumeric(item.ValueType))
{
if (QueryContext.Engine.OperatorEq(iter.CurrentPosition + 1, item.TypedValue) != null)
{
yield return iter.Current;
if (!m_contextSensitive)
break;
}
}
else
if (Core.BooleanValue(item))
yield return iter.Current;
}
}
}
}