public RelationshipElement(MetadataEntityComplexProperty owner, string associationName, string principal, string dependent)
{
if (owner == null)
{
throw new ArgumentNullException("owner");
}
if (string.IsNullOrWhiteSpace(associationName))
{
throw new ArgumentNullException("associationName");
}
_owner = owner;
_associationName = associationName.Trim();
_from = principal;
_to = dependent;
}
private void ResolveEntity(XmlReader reader, MetadataContainerBase container)
{
//创建实体元素对象
var entity = container.CreateEntity(reader.GetAttribute(XML_NAME_ATTRIBUTE));
//设置实体元素的基类名
entity.BaseEntityName = reader.GetAttribute(XML_INHERITS_ATTRIBUTE);
//处理实体元素的所有其他未知属性
this.ProcessAttributes(reader, entity, (element, prefix, localName, value, namespaceUri) =>
{
return((localName == XML_NAME_ATTRIBUTE && string.IsNullOrEmpty(namespaceUri)) ||
(localName == XML_INHERITS_ATTRIBUTE && string.IsNullOrEmpty(namespaceUri)));
});
int depth = reader.Depth;
while (reader.Read() && reader.Depth > depth)
{
if (reader.NodeType != XmlNodeType.Element)
{
continue;
}
switch (reader.Name)
{
case XML_KEY_ELEMENT:
while (reader.Read() && reader.Depth > depth + 1)
{
if (reader.NodeType != XmlNodeType.Element)
{
continue;
}
if (reader.Name == XML_PROPERTYREF_ELEMENT)
{
entity.SetKey(reader.GetAttribute(XML_NAME_ATTRIBUTE));
}
else
{
this.ProcessUnrecognizedElement(reader, null, container);
}
}
break;
case XML_PROPERTY_ELEMENT:
var property = new MetadataEntitySimplexProperty(reader.GetAttribute(XML_NAME_ATTRIBUTE), reader.GetAttribute(XML_TYPE_ATTRIBUTE))
{
Length = this.GetAttributeValue <int>(reader, XML_LENGTH_ATTRIBUTE),
Nullable = this.GetAttributeValue <bool>(reader, XML_NULLABLE_ATTRIBUTE),
Precision = this.GetAttributeValue <byte>(reader, XML_PRECISION_ATTRIBUTE),
Scale = this.GetAttributeValue <byte>(reader, XML_SCALE_ATTRIBUTE),
};
//处理属性元素的所有其他未知属性
this.ProcessAttributes(reader, property, (element, prefix, localName, value, namespaceUri) =>
{
return((localName == XML_LENGTH_ATTRIBUTE && string.IsNullOrEmpty(namespaceUri)) ||
(localName == XML_NULLABLE_ATTRIBUTE && string.IsNullOrEmpty(namespaceUri)) ||
(localName == XML_PRECISION_ATTRIBUTE && string.IsNullOrEmpty(namespaceUri)) ||
(localName == XML_SCALE_ATTRIBUTE && string.IsNullOrEmpty(namespaceUri)));
});
//将解析成功的属性元素加入到实体的属性集合
entity.Properties.Add(property);
break;
case XML_COMPLEXPROPERTY_ELEMENT:
var complexProperty = new MetadataEntityComplexProperty(
reader.GetAttribute(XML_NAME_ATTRIBUTE),
reader.GetAttribute(XML_RELATIONSHIP_ATTRIBUTE),
reader.GetAttribute(XML_FROM_ATTRIBUTE),
reader.GetAttribute(XML_TO_ATTRIBUTE));
//将解析成功的属性元素加入到实体的属性集合
entity.Properties.Add(complexProperty);
break;
default:
this.ProcessUnrecognizedElement(reader, null, container);
break;
}
}
switch (container.Kind)
{
case MetadataElementKind.Concept:
((MetadataConceptContainer)container).Entities.Add((MetadataConceptEntity)entity);
break;
case MetadataElementKind.Storage:
((MetadataStorageContainer)container).Entities.Add((MetadataStorageEntity)entity);
break;
}
}