protected virtual void Traverse <TContext>(IObjectDescriptor value, IObjectGraphVisitor <TContext> visitor, int currentDepth, TContext context)
{
if (++currentDepth > maxRecursion)
{
throw new InvalidOperationException("Too much recursion when traversing the object graph");
}
if (visitor.Enter(value, context))
{
TypeCode typeCode = value.Type.GetTypeCode();
switch (typeCode)
{
case TypeCode.Boolean:
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
case TypeCode.DateTime:
case TypeCode.String:
visitor.VisitScalar(value, context);
break;
case TypeCode.Empty:
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "TypeCode.{0} is not supported.", typeCode));
default:
if (value.IsDbNull())
{
visitor.VisitScalar((IObjectDescriptor) new ObjectDescriptor(null, typeof(object), typeof(object)), context);
}
if (value.Value == null || value.Type == typeof(TimeSpan))
{
visitor.VisitScalar(value, context);
}
else
{
Type underlyingType = Nullable.GetUnderlyingType(value.Type);
if (underlyingType != null)
{
Traverse(new ObjectDescriptor(value.Value, underlyingType, value.Type, value.ScalarStyle), visitor, currentDepth, context);
}
else
{
TraverseObject(value, visitor, currentDepth, context);
}
}
break;
}
}
}
protected virtual void Traverse <TContext>(object name, IObjectDescriptor value, IObjectGraphVisitor <TContext> visitor, TContext context, Stack <ObjectPathSegment> path)
{
if (path.Count >= maxRecursion)
{
var message = new StringBuilder();
message.AppendLine("Too much recursion when traversing the object graph.");
message.AppendLine("The path to reach this recursion was:");
var lines = new Stack <KeyValuePair <string, string> >(path.Count);
var maxNameLength = 0;
foreach (var segment in path)
{
var segmentName = TypeConverter.ChangeType <string>(segment.name);
maxNameLength = Math.Max(maxNameLength, segmentName.Length);
lines.Push(new KeyValuePair <string, string>(segmentName, segment.value.Type.FullName));
}
foreach (var line in lines)
{
message
.Append(" -> ")
.Append(line.Key.PadRight(maxNameLength))
.Append(" [")
.Append(line.Value)
.AppendLine("]");
}
throw new MaximumRecursionLevelReachedException(message.ToString());
}
if (!visitor.Enter(value, context))
{
return;
}
path.Push(new ObjectPathSegment(name, value));
try
{
var typeCode = value.Type.GetTypeCode();
switch (typeCode)
{
case TypeCode.Boolean:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.SByte:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
case TypeCode.String:
case TypeCode.Char:
case TypeCode.DateTime:
visitor.VisitScalar(value, context);
break;
case TypeCode.Empty:
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "TypeCode.{0} is not supported.", typeCode));
default:
if (value.IsDbNull())
{
visitor.VisitScalar(new ObjectDescriptor(null, typeof(object), typeof(object)), context);
}
if (value.Value == null || value.Type == typeof(TimeSpan))
{
visitor.VisitScalar(value, context);
break;
}
var underlyingType = Nullable.GetUnderlyingType(value.Type);
if (underlyingType != null)
{
// This is a nullable type, recursively handle it with its underlying type.
// Note that if it contains null, the condition above already took care of it
Traverse("Value", new ObjectDescriptor(value.Value, underlyingType, value.Type, value.ScalarStyle), visitor, context, path);
}
else
{
TraverseObject(value, visitor, context, path);
}
break;
}
}
finally
{
path.Pop();
}
}
