protected override void ReadObjectProperties(JsonReader reader, Expression result, Dictionary <string, Property> properties, JsonSerializer serializer)
{
if (result is ConstantExpression constantExpression)
{
reader.CheckNotNull(nameof(reader)).AssertProperty(nameof(ConstantExpression.Type));
var typeInfo = reader.Read <TypeInfo>(serializer);
constantExpression.Type = typeInfo ?? throw reader.CreateException($"{nameof(ConstantExpression.Type)} must not be null.");
reader.Advance();
if (reader.IsProperty(ValueTypePropertyName))
{
typeInfo = reader.Read <TypeInfo>(serializer);
reader.Advance();
}
reader.AssertProperty(nameof(ConstantExpression.Value), false);
var value = reader.Read(typeInfo, serializer);
constantExpression.Value = value;
reader.AssertEndObject();
}
else
{
base.ReadObjectProperties(reader, result, properties, serializer);
}
}
private static GeographyPoint ReadCoordinates(JsonReader coordinatesReader)
{
coordinatesReader.ExpectAndAdvance(JsonToken.StartArray);
double ReadFloatOrInt()
{
switch (coordinatesReader.TokenType)
{
case JsonToken.Integer:
return(coordinatesReader.ExpectAndAdvance <long>(JsonToken.Integer));
// Treat all other cases as Float and let ExpectAndAdvance() handle any errors.
default:
return(coordinatesReader.ExpectAndAdvance <double>(JsonToken.Float));
}
}
double longitude = ReadFloatOrInt();
double latitude = ReadFloatOrInt();
// Skip remaining coordinates, e.g. z and m.
while (coordinatesReader.TokenType != JsonToken.EndArray)
{
coordinatesReader.Advance();
}
coordinatesReader.ExpectAndAdvance(JsonToken.EndArray);
return(GeographyPoint.Create(latitude, longitude));
}
/// <summary>
/// Reads the properties of JSON objects, enforcing the presence of required properties and ignoring the order of properties,
/// and then advances the given reader to the next token after the end of the object.
/// </summary>
/// <param name="reader">The JSON reader to use to read an object.</param>
/// <param name="requiredProperties">
/// The names of all JSON properties that are expected to be present in the parsed object.
/// </param>
/// <param name="readProperty">
/// A callback that reads a property value with the given name from the given <see cref="JsonReader" />. It must
/// advance the reader to the name of the next property, or the end of the object if there are no more properties to read.
/// </param>
/// <remarks>
/// This method will advance the reader to the next position after the end of the object.
/// </remarks>
public static void ReadObjectAndAdvance(
this JsonReader reader,
IEnumerable <string> requiredProperties,
Action <JsonReader, string> readProperty)
{
reader.ReadObject(requiredProperties, readProperty);
reader.Advance();
}
protected override void ReadObjectProperties(JsonReader reader, VariableQueryArgumentList result, Dictionary <string, Property> properties, JsonSerializer serializer)
{
TypeInfo?elementTypeInfo;
void SetResult(List <object?>?values = null)
{
reader.AssertEndObject();
result.CheckNotNull(nameof(result)).ElementType = elementTypeInfo;
result.Values = values ?? new List <object?>();
}
reader.CheckNotNull(nameof(reader)).AssertProperty(nameof(VariableQueryArgumentList.ElementType));
elementTypeInfo = reader.Read <TypeInfo>(serializer) ?? throw reader.CreateException($"{nameof(VariableQueryArgumentList.ElementType)} must not be null.");
reader.Advance();
if (reader.TokenType == JsonToken.Null)
{
SetResult();
return;
}
if (reader.TokenType != JsonToken.StartArray)
{
throw reader.CreateException($"Expected array");
}
bool TryReadNextItem(out object?value)
{
if (!reader.TryRead(elementTypeInfo !, serializer, out value))
{
// TODO: is max length quota required?
if (reader.TokenType == JsonToken.EndArray)
{
return(false);
}
throw reader.CreateException("Unexpected token structure.");
}
return(true);
}
var values = new List <object?>();
while (TryReadNextItem(out object?value))
{
values.Add(value);
}
SetResult(values);
}
public override object ReadJson(
JsonReader reader,
Type objectType,
object existingValue,
JsonSerializer serializer)
{
// Check for null first.
if (reader.TokenType == JsonToken.Null)
{
return(null);
}
var book = new T();
reader.ExpectAndAdvance(JsonToken.StartObject);
while (reader.TokenType != JsonToken.EndObject)
{
string propertyName = reader.ExpectAndAdvance <string>(JsonToken.PropertyName);
switch (propertyName)
{
case "ISBN":
book.InternationalStandardBookNumber = serializer.Deserialize <string>(reader);
break;
case "Title":
book.Name = serializer.Deserialize <string>(reader);
break;
case "Author":
book.AuthorName = serializer.Deserialize <string>(reader);
break;
case "PublishDate":
book.PublishDateTime = serializer.Deserialize <DateTime?>(reader);
break;
default:
// Ignore properties we don't understand.
break;
}
reader.Advance();
}
return(book);
}
public override object ReadJson(
JsonReader reader,
Type objectType,
object existingValue,
JsonSerializer serializer)
{
// Check for null first.
if (reader.TokenType == JsonToken.Null)
{
return(null);
}
var author = new TAuthor {
FullName = string.Empty
};
reader.ExpectAndAdvance(JsonToken.StartObject);
while (reader.TokenType != JsonToken.EndObject)
{
string propertyName = reader.ExpectAndAdvance <string>(JsonToken.PropertyName);
switch (propertyName)
{
case "FirstName":
author.FullName = serializer.Deserialize <string>(reader) + author.FullName;
break;
case "LastName":
string lastName = serializer.Deserialize <string>(reader);
string separator = string.IsNullOrWhiteSpace(lastName) ? string.Empty : " ";
author.FullName += separator + lastName;
break;
default:
// Ignore properties we don't understand.
break;
}
reader.Advance();
}
return(author);
}
public override object ReadJson(
JsonReader reader,
Type objectType,
object existingValue,
JsonSerializer serializer)
{
// Check for null first.
if (reader.TokenType == JsonToken.Null)
{
return(null);
}
reader.ExpectAndAdvance(JsonToken.StartObject);
reader.ExpectAndAdvance(JsonToken.PropertyName, "type");
reader.ExpectAndAdvance(JsonToken.String, "Point");
reader.ExpectAndAdvance(JsonToken.PropertyName, "coordinates");
reader.ExpectAndAdvance(JsonToken.StartArray);
double longitude = reader.ExpectAndAdvance <double>(JsonToken.Float);
double latitude = reader.ExpectAndAdvance <double>(JsonToken.Float);
reader.ExpectAndAdvance(JsonToken.EndArray);
if (reader.TokenType == JsonToken.PropertyName && reader.Value.Equals("crs"))
{
reader.Advance();
reader.ExpectAndAdvance(JsonToken.StartObject);
reader.ExpectAndAdvance(JsonToken.PropertyName, "type");
reader.ExpectAndAdvance(JsonToken.String, "name");
reader.ExpectAndAdvance(JsonToken.PropertyName, "properties");
reader.ExpectAndAdvance(JsonToken.StartObject);
reader.ExpectAndAdvance(JsonToken.PropertyName, "name");
reader.ExpectAndAdvance(JsonToken.String, "EPSG:4326");
reader.ExpectAndAdvance(JsonToken.EndObject);
reader.ExpectAndAdvance(JsonToken.EndObject);
}
reader.Expect(JsonToken.EndObject);
return(GeographyPoint.Create(latitude, longitude));
}
protected override void ReadObjectProperties(JsonReader reader, DynamicObject result, Dictionary <string, Property> properties, JsonSerializer serializer)
{
reader.Advance();
TypeInfo?typeInfo = null;
void SetResult(IEnumerable <DynamicProperty>?properties = null)
{
reader.AssertEndObject();
result.Type = typeInfo;
if (properties?.Any() == true)
{
result.Properties = new PropertySet(properties);
}
}
if (reader.IsProperty(nameof(DynamicObject.Type)))
{
typeInfo = reader.Read <TypeInfo?>(serializer);
reader.Advance();
}
if (reader.IsProperty("Value"))
{
var value = reader.Read(typeInfo, serializer);
SetResult(new[] { new DynamicProperty(string.Empty, value) });
return;
}
if (reader.IsProperty("Values"))
{
reader.Advance();
if (reader.TokenType == JsonToken.Null)
{
SetResult();
return;
}
if (reader.TokenType != JsonToken.StartArray)
{
throw reader.CreateException($"Expected array");
}
var elementType = TypeHelper.GetElementType(typeInfo?.Type) ?? typeof(object);
bool TryReadNextItem(out object?value)
{
if (!reader.TryRead(elementType, serializer, out value))
{
// TODO: is max length quota required?
if (reader.TokenType == JsonToken.EndArray)
{
return(false);
}
throw reader.CreateException("Unexpected token structure.");
}
return(true);
}
var values = new List <object?>();
while (TryReadNextItem(out var item))
{
values.Add(item);
}
if (values.Any(x => x != null && (elementType == typeof(object) || !elementType.IsAssignableFrom(x.GetType()))) &&
values.All(x => x is null || x is string))
{
elementType = typeof(string);
}
var valueArray = CastCollectionToArrayOfType(elementType, values);
SetResult(new[] { new DynamicProperty(string.Empty, valueArray) });
return;
}
if (reader.IsProperty(nameof(DynamicObject.Properties)))
{
reader.Advance();
if (reader.TokenType == JsonToken.Null)
{
SetResult();
return;
}
if (reader.TokenType != JsonToken.StartArray)
{
throw reader.CreateException("Expected array");
}
var propertySet = new List <DynamicProperty>();
bool NextItem()
{
// TODO: is max length quota required?
reader.Advance();
return(reader.TokenType != JsonToken.EndArray);
}
while (NextItem())
{
reader.AssertStartObject(false);
reader.AssertProperty(nameof(DynamicProperty.Name));
var name = reader.ReadAsString() ?? throw reader.CreateException("Property name must not be null");
reader.AssertProperty(nameof(Type));
var type = reader.Read <TypeInfo?>(serializer);
reader.AssertProperty(nameof(DynamicProperty.Value));
var value = reader.Read(type, serializer);
reader.AssertEndObject();
propertySet.Add(new DynamicProperty(name, value));
}
SetResult(propertySet);
return;
}
throw reader.CreateException($"Unexpected token {reader.TokenType}");
}
protected override void ReadObjectProperties(JsonReader reader, DynamicObject result, Dictionary <string, Property> properties, JsonSerializer serializer)
{
reader.CheckNotNull(nameof(reader)).Advance();
result.CheckNotNull(nameof(result));
serializer.CheckNotNull(nameof(serializer));
TypeInfo?typeInfo = null;
void SetResult(IEnumerable <DynamicProperty>?properties = null)
{
reader.AssertEndObject();
result.Type = typeInfo;
if (properties?.Any() is true)
{
result.Properties = new PropertySet(properties);
}
}
if (reader.IsProperty(nameof(DynamicObject.Type)))
{
typeInfo = reader.Read <TypeInfo?>(serializer);
reader.Advance();
}
bool IsProperty(string property, out bool isDynamicValueType)
{
isDynamicValueType = false;
if (reader.IsProperty(property))
{
return(true);
}
if (reader.IsProperty($"Dynamic{property}"))
{
isDynamicValueType = true;
return(true);
}
return(false);
}
if (IsProperty(ValueProperty, out var isDynamicValue))
{
var value = isDynamicValue
? reader.Read <DynamicObject>(serializer)
: reader.Read(typeInfo, serializer);
SetResult(new[] { new DynamicProperty(string.Empty, value) });
return;
}
if (IsProperty(ValuesProperty, out isDynamicValue))
{
reader.Advance();
if (reader.TokenType == JsonToken.Null)
{
SetResult();
return;
}
if (reader.TokenType != JsonToken.StartArray)
{
throw reader.CreateException($"Expected array");
}
var elementType = TypeHelper.GetElementType(typeInfo?.ToType()) ?? typeof(object);
bool TryReadNextItem(out object?value)
{
var itemType = isDynamicValue ? typeof(DynamicObject) : elementType;
if (!reader.TryRead(itemType, serializer, out value))
{
if (reader.TokenType == JsonToken.EndArray)
{
return(false);
}
throw reader.CreateException("Unexpected token structure.");
}
return(true);
}
var values = new List <object?>();
while (TryReadNextItem(out var item))
{
values.Add(item);
}
if (isDynamicValue)
{
elementType = typeof(object);
}
else if (values.Any(x => x is not null && (elementType == typeof(object) || !elementType.IsInstanceOfType(x))) &&
values.All(x => x is null || x is string))
{
elementType = typeof(string);
}
var valueArray = values.CastCollectionToArrayOfType(elementType);
SetResult(new[] { new DynamicProperty(string.Empty, valueArray) });
return;
}
if (reader.IsProperty(nameof(DynamicObject.Properties)))
{
reader.Advance();
if (reader.TokenType == JsonToken.Null)
{
SetResult();
return;
}
if (reader.TokenType != JsonToken.StartArray)
{
throw reader.CreateException("Expected array");
}
var propertySet = new List <DynamicProperty>();
bool NextItem()
{
reader.Advance();
return(reader.TokenType != JsonToken.EndArray);
}
while (NextItem())
{
reader.AssertStartObject(false);
reader.AssertProperty(nameof(DynamicProperty.Name));
var name = reader.ReadAsString() ?? throw reader.CreateException("Property name must not be null");
reader.AssertProperty(nameof(Type));
var type = reader.Read <TypeInfo?>(serializer);
reader.AssertProperty(nameof(DynamicProperty.Value));
var value = reader.Read(type, serializer);
reader.AssertEndObject();
propertySet.Add(new DynamicProperty(name, value));
}
SetResult(propertySet);
return;
}
throw reader.CreateException($"Unexpected token {reader.TokenType}");
}