/// <summary>
/// Determines whether the member of dom specified by name is null.
/// If a member with the specified name does not exist an ArgumentException will be thrown.
/// </summary>
public /* not virtual */ bool IsNull(DocumentObject dom, string name)
{
//bool isNull = false;
int dot = name.IndexOf('.');
if (dot == 0)
{
throw new ArgumentException(DomSR.InvalidValueName(name));
}
string trail = null;
if (dot > 0)
{
trail = name.Substring(dot + 1);
name = name.Substring(0, dot);
}
ValueDescriptor vd = _vds[name];
if (vd == null)
{
throw new ArgumentException(DomSR.InvalidValueName(name));
}
if (vd is NullableDescriptor || vd is ValueTypeDescriptor)
{
if (trail != null)
{
throw new ArgumentException(DomSR.InvalidValueName(name));
}
return(vd.IsNull(dom));
}
DocumentObject docObj = (DocumentObject)vd.GetValue(dom, GV.ReadOnly);
if (docObj == null)
{
return(true);
}
if (trail != null)
{
return(docObj.IsNull(trail));
}
return(docObj.IsNull());
// DomValueDescriptor vd = vds[name];
// if (vd == null)
// throw new ArgumentException(DomSR.InvalidValueName(name));
//
// return vd.IsNull(dom);
}
/// <summary>
/// Determines whether all members of the specified dom are null. If dom contains no members IsNull
/// returns true.
/// </summary>
public bool IsNull(DocumentObject dom)
{
int count = _vds.Count;
for (int index = 0; index < count; index++)
{
ValueDescriptor vd = _vds[index];
if (vd.IsRefOnly)
{
continue;
}
if (!vd.IsNull(dom))
{
return(false);
}
}
return(true);
}