public virtual object GetIdentifier(Expression expression)
{
if (expression is MemberExpression memberExpression)
{
var memberName = memberExpression.Member.Name;
var elementType = memberExpression.Expression.Type;
if (string.Equals(memberName, "id", StringComparison.OrdinalIgnoreCase) || string.Equals(memberName, "label", StringComparison.OrdinalIgnoreCase))
{
var graphElementType = ElementTypes
.GetOrCreateValue(this)
.GetOrAdd(
elementType,
closureElementType =>
{
if (elementType == typeof(IVertex) || VerticesModel.TryGetConstructiveLabel(elementType).IsSome)
return GraphElementType.Vertex;
if (elementType == typeof(IEdge) || EdgesModel.TryGetConstructiveLabel(elementType).IsSome)
return GraphElementType.Edge;
return typeof(IVertexProperty).IsAssignableFrom(elementType)
? GraphElementType.VertexProperty
: GraphElementType.None;
});
if (graphElementType != GraphElementType.None)
{
if (string.Equals(memberName, "id", StringComparison.OrdinalIgnoreCase))
return T.Id;
if (string.Equals(memberName, "label", StringComparison.OrdinalIgnoreCase))
return T.Label;
}
}
return memberName;
}
throw new ExpressionNotSupportedException(expression);
}