/// <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>
/// Create a new instance of Instant from:
///
/// Year, Month, Day, Hour, Minute, Second, and Millisecond
///
/// in the specified timezone.
///
/// Use timeZone = DateTimeZone.Utc for the UTC timezone.
/// </summary>
public static Instant Zoned(int year, int month, int day, int hour, int minute, int second, int millisecond, DateTimeZone timeZone)
{
// Create local date from the specified fields
var localDateTime = new LocalDateTime(year, month, day, hour, minute, second, millisecond);
// Convert to Instant in the specified timezone
var result = InstantUtil.Zoned(localDateTime, timeZone);
return(result);
}
/// <summary>
/// Convert System.DateTime with Kind=Utc to Instant.
///
/// Converts default constructed DateTime to Instant.Empty.
///
/// Error message if the timezone is not UTC.
/// </summary>
public static Instant ToInstant(this DateTime value)
{
// Error message if the timezone is not UTC.
if (value.Kind != DateTimeKind.Utc)
{
throw new Exception("DateTime can only be converted to Instant when its Kind=UTC.");
}
if (value != default)
{
// If not default constructed value, convert
// to millisecond precision using fields
return(InstantUtil.Utc(
value.Year, value.Month, value.Day, value.Hour, value.Minute, value.Second, value.Millisecond));
}
else
{
// Converts default constructed DateTime
// to Instant.Empty
return(InstantUtil.Empty);
}
}
/// <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)));
}
}
}
//--- PRIVATE
/// <summary>
/// Populate key elements from an array of tokens starting
/// at the specified token index. Elements that are themselves
/// keys may use more than one token.
///
/// This method returns the index of the first unused token.
/// The returned value is the same as the length of the tokens
/// array if all tokens are used.
///
/// If key AKey has two elements, B and C, where
///
/// * B has type BKey which has two string elements, and
/// * C has type string,
///
/// the semicolon delimited key has the following format:
///
/// BToken1;BToken2;CToken
///
/// To avoid serialization format uncertainty, key elements
/// can have any atomic type except Double.
/// </summary>
private int PopulateFrom(string[] tokens, int tokenIndex)
{
// Get key elements using reflection
var elementInfoArray = DataTypeInfo.GetOrCreate(this).DataElements;
// If singleton is detected process it separately, then exit
if (elementInfoArray.Length == 0)
{
// Check that string key is empty
if (tokens.Length != 1 || tokens[0] != String.Empty)
{
throw new Exception($"Type {GetType()} has key {string.Join(";", tokens)} while " +
$"for a singleton the key must be an empty string (String.Empty). " +
$"Singleton key is a key that has no key elements.");
}
// Return the length of empty key which consists of one (empty) token
return(1);
}
// Check that there are enough remaining tokens in the key for each key element
if (tokens.Length - tokenIndex < elementInfoArray.Length)
{
throw new Exception(
$"Key of type {GetType().Name} requires at least {elementInfoArray.Length} elements " +
$"{String.Join(";", elementInfoArray.Select(p => p.Name).ToArray())} while there are " +
$"only {tokens.Length - tokenIndex} remaining key tokens: {string.Join(";", tokens)}.");
}
// Iterate over element info elements, advancing tokenIndex by the required
// number of tokens for each element. In case of embedded keys, the value of
// tokenIndex is advanced by the recursive call to InitFromTokens method
// of the embedded key.
foreach (var elementInfo in elementInfoArray)
{
// Get element type
Type elementType = elementInfo.PropertyType;
// Convert string token to value depending on elementType
if (elementType == typeof(string))
{
CheckTokenNotEmpty(tokens, tokenIndex);
string token = tokens[tokenIndex++];
elementInfo.SetValue(this, token);
}
else if (elementType == typeof(double) || elementType == typeof(double?))
{
throw new Exception(
$"Key element {elementInfo.Name} has type Double. Elements of this type " +
$"cannot be part of key due to serialization format uncertainty.");
}
else if (elementType == typeof(bool) || elementType == typeof(bool?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
string token = tokens[tokenIndex++];
bool tokenValue = bool.Parse(token);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(int) || elementType == typeof(int?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
string token = tokens[tokenIndex++];
int tokenValue = int.Parse(token);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(long) || elementType == typeof(long?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
string token = tokens[tokenIndex++];
long tokenValue = long.Parse(token);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(LocalDate) || elementType == typeof(LocalDate?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
// Inside the key, LocalDate is represented as readable int in
// non-delimited yyyymmdd format, not as delimited ISO string.
//
// First parse the string to int, then convert int to LocalDate.
string token = tokens[tokenIndex++];
if (!Int32.TryParse(token, out int isoInt))
{
throw new Exception(
$"Element {elementInfo.Name} of key type {GetType().Name} has type LocalDate and value {token} " +
$"that cannot be converted to readable int in non-delimited yyyymmdd format.");
}
LocalDate tokenValue = LocalDateUtil.FromIsoInt(isoInt);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(LocalTime) || elementType == typeof(LocalTime?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
// Inside the key, LocalTime is represented as readable int in
// non-delimited hhmmssfff format, not as delimited ISO string.
//
// First parse the string to int, then convert int to LocalTime.
string token = tokens[tokenIndex++];
if (!Int32.TryParse(token, out int isoInt))
{
throw new Exception(
$"Element {elementInfo.Name} of key type {GetType().Name} has type LocalTime and value {token} " +
$"that cannot be converted to readable int in non-delimited hhmmssfff format.");
}
LocalTime tokenValue = LocalTimeUtil.FromIsoInt(isoInt);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(LocalMinute) || elementType == typeof(LocalMinute?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
// Inside the key, LocalMinute is represented as readable int in
// non-delimited hhmm format, not as delimited ISO string.
//
// First parse the string to int, then convert int to LocalTime.
string token = tokens[tokenIndex++];
if (!Int32.TryParse(token, out int isoInt))
{
throw new Exception(
$"Element {elementInfo.Name} of key type {GetType().Name} has type LocalMinute and value {token} " +
$"that cannot be converted to readable int in non-delimited hhmm format.");
}
LocalMinute tokenValue = LocalMinuteUtil.FromIsoInt(isoInt);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(LocalDateTime) || elementType == typeof(LocalDateTime?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
// Inside the key, LocalDateTime is represented as readable long in
// non-delimited yyyymmddhhmmssfff format, not as delimited ISO string.
//
// First parse the string to long, then convert int to LocalDateTime.
string token = tokens[tokenIndex++];
if (!Int64.TryParse(token, out long isoLong))
{
throw new Exception(
$"Element {elementInfo.Name} of key type {GetType().Name} has type LocalDateTime and value {token} " +
$"that cannot be converted to readable long in non-delimited yyyymmddhhmmssfff format.");
}
LocalDateTime tokenValue = LocalDateTimeUtil.FromIsoLong(isoLong);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(Instant) || elementType == typeof(Instant?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
// Inside the key, Instant is represented as readable long in
// non-delimited yyyymmddhhmmssfff format, not as delimited ISO string.
//
// First parse the string to long, then convert int to Instant.
string token = tokens[tokenIndex++];
if (!Int64.TryParse(token, out long isoLong))
{
throw new Exception(
$"Element {elementInfo.Name} of key type {GetType().Name} has type Instant and value {token} " +
$"that cannot be converted to readable long in non-delimited yyyymmddhhmmssfff format.");
}
Instant tokenValue = InstantUtil.FromIsoLong(isoLong);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType == typeof(TemporalId) || elementType == typeof(TemporalId?))
{
CheckTokenNotEmpty(tokens, tokenIndex);
string token = tokens[tokenIndex++];
TemporalId tokenValue = TemporalId.Parse(token);
elementInfo.SetValue(this, tokenValue);
}
else if (elementType.BaseType == typeof(Enum)) // TODO Support nullable Enum in key
{
CheckTokenNotEmpty(tokens, tokenIndex);
string token = tokens[tokenIndex++];
object tokenValue = Enum.Parse(elementType, token);
elementInfo.SetValue(this, tokenValue);
}
else if (typeof(Key).IsAssignableFrom(elementType))
{
Key keyElement = (Key)Activator.CreateInstance(elementType);
tokenIndex = keyElement.PopulateFrom(tokens, tokenIndex);
elementInfo.SetValue(this, keyElement);
}
else
{
// Field type is unsupported for a key, error message
throw new Exception(
$"Element {elementInfo.Name} of key type {GetType().Name} has type {elementType} that " +
$"is not one of the supported key element types. Available key element types are " +
$"string, bool, int, long, LocalDate, LocalTime, LocalMinute, LocalDateTime, Instant, Enum, or Key.");
}
}
return(tokenIndex);
}
/// <summary>
/// Write atomic value. Value type
/// will be inferred from object.GetType().
/// </summary>
public void WriteValue(object value)
{
// Check state transition matrix
if (currentState_ == TreeWriterState.ValueStarted)
{
currentState_ = TreeWriterState.ValueWritten;
}
else if (currentState_ == TreeWriterState.ValueArrayItemStarted)
{
currentState_ = TreeWriterState.ValueArrayItemWritten;
}
else
{
throw new Exception(
$"A call to WriteEndValue(...) does not follow a matching WriteValue(...) at the same indent level.");
}
// Check that we are either inside dictionary or array
Type elementType = null;
if (currentArray_ != null)
{
elementType = currentArrayItemType_;
}
else if (currentDict_ != null)
{
elementType = currentElementInfo_.PropertyType;
}
else
{
throw new Exception($"Cannot WriteValue(...)for element {currentElementName_} " +
$"is called outside dictionary or array.");
}
if (value.IsEmpty())
{
// Do not record null or empty value into dictionary, but add it to an array
// Add to dictionary or array, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = null;
}
return;
}
// Write based on element type
Type valueType = value.GetType();
if (elementType == typeof(string) ||
elementType == typeof(double) || elementType == typeof(double?) ||
elementType == typeof(bool) || elementType == typeof(bool?) ||
elementType == typeof(int) || elementType == typeof(int?) ||
elementType == typeof(long) || elementType == typeof(long?))
{
// Check type match
if (!elementType.IsAssignableFrom(valueType))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into element of type {elementType.Name}.");
}
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = value;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, value);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else if (elementType == typeof(LocalDate) || elementType == typeof(LocalDate?))
{
// Check type match
if (valueType != typeof(int))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into LocalDate; type should be int32.");
}
// Deserialize LocalDate as ISO int in yyyymmdd format
LocalDate dateValue = LocalDateUtil.FromIsoInt((int)value);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = dateValue;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, dateValue);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else if (elementType == typeof(LocalTime) || elementType == typeof(LocalTime?))
{
// Check type match
if (valueType != typeof(int))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into LocalTime; type should be int32.");
}
// Deserialize LocalTime as ISO int in hhmmssfff format
LocalTime timeValue = LocalTimeUtil.FromIsoInt((int)value);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = timeValue;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, timeValue);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else if (elementType == typeof(LocalMinute) || elementType == typeof(LocalMinute?))
{
// Check type match
if (valueType != typeof(int))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into LocalMinute; type should be int32.");
}
// Deserialize LocalTime as ISO int in hhmmssfff format
LocalMinute minuteValue = LocalMinuteUtil.FromIsoInt((int)value);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = minuteValue;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, minuteValue);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else if (elementType == typeof(LocalDateTime) || elementType == typeof(LocalDateTime?))
{
// Check type match
if (valueType != typeof(long))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into LocalDateTime; type should be int64.");
}
// Deserialize LocalDateTime as ISO long in yyyymmddhhmmssfff format
LocalDateTime dateTimeValue = LocalDateTimeUtil.FromIsoLong((long)value);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = dateTimeValue;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, dateTimeValue);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else if (elementType == typeof(Instant) || elementType == typeof(Instant?))
{
// Check type match
if (valueType != typeof(long))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into Instant; type should be int64.");
}
// Deserialize Instant as ISO long in yyyymmddhhmmssfff format
Instant instantValue = InstantUtil.FromIsoLong((long)value);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = instantValue;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, instantValue);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else if (elementType.IsEnum)
{
// Check type match
if (valueType != typeof(string))
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into enum {elementType.Name}; type should be string.");
}
string stringValue = (string)value;
// Deserialize enum as string
string enumString = (string)value;
object enumValue = Enum.Parse(elementType, enumString);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = enumValue;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, enumValue);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else
{
// We run out of value types at this point, now we can create
// a reference type and check that it implements Key
object keyObj = (Key)Activator.CreateInstance(elementType);
if (keyObj is Key)
{
Key key = (Key)keyObj;
// Check type match
if (valueType != typeof(string) && valueType != elementType)
{
throw new Exception(
$"Attempting to deserialize value of type {valueType.Name} " +
$"into key type {elementType.Name}; keys should be serialized into semicolon delimited string.");
}
// Populate by parsing semicolon delimited string
string stringValue = value.AsString();
key.PopulateFrom(stringValue);
// Add to array or dictionary, depending on what we are inside of
if (currentArray_ != null)
{
currentArray_[currentArray_.Count - 1] = key;
}
else if (currentDict_ != null)
{
currentElementInfo_.SetValue(currentDict_, key);
}
else
{
throw new Exception($"Value can only be added to a dictionary or array.");
}
}
else
{
// Argument type is unsupported, error message
throw new Exception($"Element type {value.GetType()} is not supported for serialization.");
}
}
}
/// <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}.");
}
}
}
}
}