private static DomObject CreateElement(XmlReader reader, DomMetaElement metaElement)
{
DomComplexType type = metaElement.Type;
// Check for xsi:type attribute, indicating a derived type
string typeName = reader.GetAttribute("xsi:type");
if (typeName != null)
{
// check for qualified type name
string prefix = string.Empty;
int index = typeName.IndexOf(':');
if (index >= 0)
{
prefix = typeName.Substring(0, index);
index++;
typeName = typeName.Substring(index, typeName.Length - index);
}
string ns = reader.LookupNamespace(prefix);
XmlQualifiedName qualifiedName = new XmlQualifiedName(typeName, ns);
type = DomSchemaRegistry.GetComplexType(qualifiedName);
if (type == null)
{
throw new InvalidOperationException("Unknown derived type");
}
}
return(new DomObject(type));
}
private static void GetAllAnnotations(DomComplexType complexType, ref List <XmlNode> lstAnnotations)
{
lstAnnotations.AddRange(complexType.Annotation);
if (complexType.BaseType != null)
{
GetAllAnnotations(complexType.BaseType, ref lstAnnotations);
}
}
/// <summary>
/// Write element
/// </summary>
/// <param name="element"></param>
/// <param name="writer"></param>
/// <param name="schema"></param>
/// <param name="bTemp"></param>
protected void WriteElement(DomObject element, XmlWriter writer, DomSchema schema, bool bTemp)
{
// Test if the element should be saved or not
if (!bTemp && !element.CanCreateInterface <ISledProjectFilesSaveableType>())
{
return;
}
string elemNs = element.MetaElement.QualifiedName.Namespace;
string elemPrefix;
// Is this the root DomObject?
if (schema != null)
{
elemPrefix = schema.GetPrefix(elemNs) ?? GeneratePrefix(elemNs);
writer.WriteStartElement(elemPrefix, element.MetaElement.Name, elemNs);
// Define the xsi namespace
writer.WriteAttributeString("xmlns", "xsi", null, XmlSchema.InstanceNamespace);
// Define schema namespaces
foreach (XmlQualifiedName name in schema.Namespaces)
{
if (name.Name != elemPrefix) // don't redefine the element namespace
{
writer.WriteAttributeString("xmlns", name.Name, null, name.Namespace);
}
}
}
else
{
// Not the root, so all schema namespaces have been defined
elemPrefix = writer.LookupPrefix(elemNs) ?? GeneratePrefix(elemNs);
writer.WriteStartElement(elemPrefix, element.MetaElement.Name, elemNs);
}
// Write type name if this is a polymorphic type
DomComplexType elementType = element.Type;
if (element.MetaElement.Type != elementType)
{
string typeName = elementType.Name.Name;
string typeNs = elementType.Name.Namespace;
string typePrefix = writer.LookupPrefix(typeNs);
if (typePrefix == null)
{
typePrefix = GeneratePrefix(typeNs);
writer.WriteAttributeString("xmlns", typePrefix, null, typeNs);
}
if (typePrefix != string.Empty)
{
typeName = typePrefix + ":" + typeName;
}
writer.WriteAttributeString("xsi", "type", XmlSchema.InstanceNamespace, typeName);
}
// When writing project file we build a list of attributes to NOT save
List <string> lstAttrsDontSave = new List <string>();
// Do some stuff if writing project file
if (!bTemp)
{
// Get all annotations (including base type annotations [and their base type annotations etc.])
List <XmlNode> lstAnnotations = new List <XmlNode>();
GetAllAnnotations(element.Type, ref lstAnnotations);
// Go through pulling out which attributes to not save based on the annotation
foreach (XmlNode annotation in lstAnnotations)
{
// Do something if it's a "dont save" annotation!
if (string.Compare(annotation.Name, DontSaveAnnotation, true) == 0)
{
XmlNode node = annotation.Attributes.GetNamedItem("name");
if (node != null)
{
string szAttribute = node.Value;
if (!lstAttrsDontSave.Contains(szAttribute))
{
lstAttrsDontSave.Add(szAttribute);
}
}
}
}
}
// Write normal attributes
foreach (DomMetaAttribute attribute in elementType.Attributes)
{
// Do some stuff if writing project file
if (!bTemp && (lstAttrsDontSave.Count > 0) && !string.IsNullOrEmpty(attribute.Name))
{
if (lstAttrsDontSave.Contains(attribute.Name))
{
continue;
}
}
object value = element.GetAttribute(attribute);
if (attribute.Required)
{
if (value == null)
{
throw new InvalidOperationException("missing attribute");
}
writer.WriteAttributeString(attribute.Name, attribute.Type.Convert(value));
}
else if (value != null && value != attribute.Type.GetDefault())
{
writer.WriteAttributeString(attribute.Name, attribute.Type.Convert(value));
}
}
// Write element value
if (element.Value != null &&
element.Value != elementType.ValueType.GetDefault())
{
writer.WriteString(elementType.ValueType.Convert(element.Value));
}
// write child elements
foreach (DomMetaElement elem in elementType.Children)
{
foreach (DomObject child in element.GetChildren(elem.Name))
{
WriteElement(child, writer, null, bTemp);
}
}
writer.WriteEndElement();
}
/// <summary>
/// Read element
/// </summary>
/// <param name="domObject"></param>
/// <param name="reader"></param>
protected void ReadElement(DomObject domObject, XmlReader reader)
{
DomComplexType type = domObject.Type;
// Read attributes
int required = type.RequiredAttributes;
while (reader.MoveToNextAttribute())
{
if (reader.Prefix == string.Empty ||
reader.LookupNamespace(reader.Prefix) == type.Name.Namespace)
{
DomMetaAttribute metaAttribute = type.GetAttribute(reader.LocalName);
if (metaAttribute != null)
{
object value = metaAttribute.Type.Convert(reader.Value);
domObject.SetAttribute(metaAttribute.Name, value);
if (metaAttribute.Required)
{
required--;
}
}
}
}
if (required != 0)
{
throw new InvalidOperationException("Missing required attribute");
}
reader.MoveToElement();
if (!reader.IsEmptyElement)
{
// Read child elements
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
// look up metadata for this element
DomMetaElement metaElement = type.GetChild(reader.LocalName);
if (metaElement != null)
{
DomObject child = CreateElement(reader, metaElement);
ReadElement(child, reader);
// At this point, child is a fully populated sub-tree
domObject.AddChild(metaElement, child);
}
else
{
reader.Skip();
}
}
else if (reader.NodeType == XmlNodeType.Text)
{
if (type.ValueType != null)
{
domObject.Value = type.ValueType.Convert(reader.Value);
}
}
else if (reader.NodeType == XmlNodeType.EndElement)
{
break;
}
}
}
reader.MoveToContent();
}
