/// <summary>Parse string using the specified value type and return the resulting variant.</summary>
public static Variant Parse(VariantType valueType, string value)
{
if (string.IsNullOrEmpty(value))
{
// Empty value
return(new Variant());
}
else
{
// Switch on type of default value
switch (valueType)
{
case VariantType.String:
return(new Variant(value));
case VariantType.Double:
double doubleResult = double.Parse(value);
return(new Variant(doubleResult));
case VariantType.Bool:
bool boolResult = bool.Parse(value);
return(new Variant(boolResult));
case VariantType.Int:
int intResult = int.Parse(value);
return(new Variant(intResult));
case VariantType.Long:
long longResult = long.Parse(value);
return(new Variant(longResult));
case VariantType.LocalDate:
LocalDate dateResult = LocalDateUtil.Parse(value);
return(new Variant(dateResult));
case VariantType.LocalTime:
LocalTime timeResult = LocalTimeUtil.Parse(value);
return(new Variant(timeResult));
case VariantType.LocalMinute:
LocalMinute minuteResult = LocalMinuteUtil.Parse(value);
return(new Variant(minuteResult));
case VariantType.LocalDateTime:
LocalDateTime dateTimeResult = LocalDateTimeUtil.Parse(value);
return(new Variant(dateTimeResult));
case VariantType.Instant:
Instant instantResult = InstantUtil.Parse(value);
return(new Variant(instantResult));
case VariantType.Enum:
throw new Exception("Variant cannot be created as enum without specifying enum typename.");
default:
// Error message if any other type
throw new Exception("Unknown value type when parsing string into variant.");
}
}
}
/// <summary>Deserialize from data in ITreeReader.</summary>
public void DeserializeFrom(ITreeReader reader)
{
// Do nothing if the selected XML node is empty
if (reader == null)
{
return;
}
// Iterate over the list of elements
var elementInfoList = DataTypeInfo.GetOrCreate(this).DataElements;
foreach (var elementInfo in elementInfoList)
{
// Get element name and type
string elementName = elementInfo.Name;
Type elementType = elementInfo.PropertyType;
// Get inner XML node, continue with next element if null
ITreeReader innerXmlNode = reader.ReadElement(elementName);
if (innerXmlNode == null)
{
continue;
}
// First check for each of the supported value types
if (elementType == typeof(string))
{
string token = innerXmlNode.ReadValue();
elementInfo.SetValue(this, token);
}
else if (elementType == typeof(double) || elementType == typeof(double?))
{
string token = innerXmlNode.ReadValue();
var value = double.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(bool) || elementType == typeof(bool?))
{
string token = innerXmlNode.ReadValue();
var value = bool.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(int) || elementType == typeof(int?))
{
string token = innerXmlNode.ReadValue();
var value = int.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(long) || elementType == typeof(long?))
{
string token = innerXmlNode.ReadValue();
var value = long.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(LocalDate) || elementType == typeof(LocalDate?))
{
string token = innerXmlNode.ReadValue();
var value = LocalDateUtil.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(LocalTime) || elementType == typeof(LocalTime?))
{
string token = innerXmlNode.ReadValue();
var value = LocalTimeUtil.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(LocalMinute) || elementType == typeof(LocalMinute?))
{
string token = innerXmlNode.ReadValue();
var value = LocalMinuteUtil.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(LocalDateTime) || elementType == typeof(LocalDateTime?))
{
string token = innerXmlNode.ReadValue();
var value = LocalDateTimeUtil.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType == typeof(Instant) || elementType == typeof(Instant?))
{
string token = innerXmlNode.ReadValue();
var value = InstantUtil.Parse(token);
elementInfo.SetValue(this, value);
}
else if (elementType.IsSubclassOf(typeof(Enum)))
{
string token = innerXmlNode.ReadValue();
var value = Enum.Parse(elementType, token);
elementInfo.SetValue(this, value);
}
else
{
// If none of the supported atomic types match, use the activator
// to create and empty instance of a complex type and populate it
var element = Activator.CreateInstance(elementType);
switch (element)
{
case IList listElement:
listElement.DeserializeFrom(elementName, reader);
break;
case Data dataElement:
var keyElement = dataElement as Key;
if (keyElement != null)
{
// Deserialize key from value node containing semicolon delimited string
string token = innerXmlNode.ReadValue();
// Parse semicolon delimited string to populate key elements
keyElement.PopulateFrom(token);
}
else
{
// Deserialize embedded data object from the contents of inner XML node
dataElement.DeserializeFrom(innerXmlNode);
}
break;
case TemporalId idElement:
// Do not serialize
break;
default:
// Error message if the type does not match any of the value or reference types
throw new Exception($"Serialization is not supported for type {elementType}.");
}
// Assign the populated key to the property
elementInfo.SetValue(this, element);
}
}
}
/// <summary>Parse string using the specified value type and return the resulting variant.</summary>
public static Variant Parse <T>(string value)
{
if (string.IsNullOrEmpty(value))
{
// Empty value
return(new Variant());
}
else
{
// Switch on type of default value
switch (default(T))
{
case string stringValue:
return(new Variant(value));
case double doubleValue:
double doubleResult = double.Parse(value);
return(new Variant(doubleResult));
case bool boolValue:
bool boolResult = bool.Parse(value);
return(new Variant(boolResult));
case int intValue:
int intResult = int.Parse(value);
return(new Variant(intResult));
case long longValue:
long longResult = long.Parse(value);
return(new Variant(longResult));
case LocalDate dateValue:
LocalDate dateResult = LocalDateUtil.Parse(value);
return(new Variant(dateResult));
case LocalTime timeValue:
LocalTime timeResult = LocalTimeUtil.Parse(value);
return(new Variant(timeResult));
case LocalMinute minuteValue:
LocalMinute minuteResult = LocalMinuteUtil.Parse(value);
return(new Variant(minuteResult));
case LocalDateTime dateTimeValue:
LocalDateTime dateTimeResult = LocalDateTimeUtil.Parse(value);
return(new Variant(dateTimeResult));
case Instant instantValue:
Instant instantResult = InstantUtil.Parse(value);
return(new Variant(instantResult));
case Enum enumValue:
object enumResult = Enum.Parse(typeof(T), value);
return(new Variant(enumResult));
default:
// Error message if any other type
throw new Exception(GetWrongTypeErrorMessage(default(T)));
}
}
}
/// <summary>Deserialize by reading element from the tree reader.</summary>
public static void DeserializeFrom(this IList obj, string elementName, ITreeReader reader)
{
// Check if the list is null
if (obj == null)
{
throw new Exception("List passed to DeserializeFrom method for element {elementName} is null.");
}
// If the list is not empty, error message because the
// object must be empty prior to parsing
if (obj.Count > 0)
{
throw new Exception("List passed to DeserializeFrom method for element {elementName} is not empty.");
}
// Get item type from list type using reflection
Type listType = obj.GetType();
if (!listType.IsGenericType)
{
throw new Exception(
$"Type {listType} cannot be serialized because it implements only IList but not IList<T>.");
}
Type[] genericParameterTypes = listType.GenericTypeArguments;
if (genericParameterTypes.Length != 1)
{
throw new Exception(
$"Generic parameter type list {genericParameterTypes} has more than " +
$"one element creating an ambiguity for deserialization code.");
}
Type itemType = genericParameterTypes[0];
// Select XML node list with the specified name and iterate over XML nodes
IEnumerable <ITreeReader> selectedXmlNodes = reader.ReadElements(elementName);
foreach (ITreeReader selectedXmlNode in selectedXmlNodes)
{
if (selectedXmlNode == null)
{
// Add null value
obj.Add(null);
}
else
{
// Switch on item type
if (itemType == typeof(string))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
obj.Add(token);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(double) || itemType == typeof(double?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = double.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(bool) || itemType == typeof(bool?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = bool.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(int) || itemType == typeof(int?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = int.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(long) || itemType == typeof(long?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = long.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(LocalDate) || itemType == typeof(LocalDate?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = LocalDateUtil.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(LocalTime) || itemType == typeof(LocalTime?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = LocalTimeUtil.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(LocalMinute) || itemType == typeof(LocalMinute?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = LocalMinuteUtil.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(LocalDateTime) || itemType == typeof(LocalDateTime?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = LocalDateTimeUtil.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType == typeof(Instant) || itemType == typeof(Instant?))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = InstantUtil.Parse(token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else if (itemType.IsSubclassOf(typeof(Enum)))
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
var value = Enum.Parse(itemType, token);
obj.Add(value);
}
else
{
obj.Add(null);
}
}
else
{
// If none of the supported atomic types match, use the activator
// to create and empty instance of a complex type and populate it
var item = Activator.CreateInstance(itemType);
switch (item)
{
case ICollection collectionItem:
throw new Exception($"Deserialization is not supported for element {elementName} " +
$"which is collection containing another collection.");
case Data dataItem:
var keyItem = dataItem as Key;
if (keyItem != null)
{
string token = selectedXmlNode.ReadValue();
if (!string.IsNullOrEmpty(token))
{
// Parse semicolon delimited token to populate key item
keyItem.PopulateFrom(token);
obj.Add(item);
}
else
{
obj.Add(null);
}
}
else
{
// Deserialize data item
dataItem.DeserializeFrom(selectedXmlNode);
obj.Add(item);
}
break;
default:
// Error message if the type does not match any of the value or reference types
throw new Exception($"Serialization is not supported for type {itemType}.");
}
}
}
}
}
