/// <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>
/// Gets the object specified by name from dom.
/// </summary>
public object GetValue(DocumentObject dom, string name, GV flags)
{
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));
}
object value = vd.GetValue(dom, flags);
if (value == null && flags == GV.GetNull) //??? also for GV.ReadOnly?
{
return(null);
}
//REVIEW DaSt: Create object in case of GV.ReadWrite?
if (trail != null)
{
if (value == null || trail == "")
{
throw new ArgumentException(DomSR.InvalidValueName(name));
}
DocumentObject doc = value as DocumentObject;
if (doc == null)
{
throw new ArgumentException(DomSR.InvalidValueName(name));
}
value = doc.GetValue(trail, flags);
}
return(value);
}