public object Deserialize(Type objectType, Stream readStream, JsonReader reader, JsonSerializer serializer)
{
object retval = Activator.CreateInstance(objectType);
if (reader.TokenType != JsonToken.StartObject)
{
throw new JsonReaderException(String.Format("Expected JsonToken.StartObject, got {0}", reader.TokenType.ToString()));
}
reader.Read(); // Burn the StartObject token
do
{
if (reader.TokenType == JsonToken.PropertyName)
{
string value = (string)reader.Value;
PropertyInfo prop = _modelManager.GetPropertyForJsonKey(objectType, value);
// If the model object has a non-standard Id property, but the "id" key is being used...
if (prop == null && value == "id")
{
prop = _modelManager.GetIdProperty(objectType);
}
if (value == "links")
{
reader.Read(); // burn the PropertyName token
//TODO: linked resources (Done??)
DeserializeLinkedResources(retval, readStream, reader, serializer);
}
else if (prop != null)
{
if (!prop.PropertyType.CanWriteAsJsonApiAttribute())
{
reader.Read(); // burn the PropertyName token
//TODO: Embedded would be dropped here!
continue; // These aren't supposed to be here, they're supposed to be in "links"!
}
object propVal;
Type enumType;
if (prop.PropertyType == typeof(string) &&
prop.GetCustomAttributes().Any(attr => attr is SerializeStringAsRawJsonAttribute))
{
reader.Read();
if (reader.TokenType == JsonToken.Null)
{
propVal = null;
}
else
{
var token = JToken.Load(reader);
var rawPropVal = token.ToString();
propVal = JsonHelpers.MinifyJson(rawPropVal);
}
}
else if (prop.PropertyType.IsGenericType &&
prop.PropertyType.GetGenericTypeDefinition() == typeof(Nullable <>) &&
(enumType = prop.PropertyType.GetGenericArguments()[0]).IsEnum)
{
// Nullable enums need special handling
reader.Read();
propVal = reader.TokenType == JsonToken.Null
? null
: Enum.Parse(enumType, reader.Value.ToString());
}
else if (prop.PropertyType == typeof(DateTimeOffset) ||
prop.PropertyType == typeof(DateTimeOffset?))
{
// For some reason
reader.ReadAsString();
propVal = reader.TokenType == JsonToken.Null
? (object)null
: DateTimeOffset.Parse(reader.Value.ToString());
}
else
{
reader.Read();
propVal = DeserializeAttribute(prop.PropertyType, reader);
}
prop.SetValue(retval, propVal, null);
// Tell the MetadataManager that we deserialized this property
MetadataManager.Instance.SetMetaForProperty(retval, prop, true);
// pop the value off the reader, so we catch the EndObject token below!.
reader.Read();
}
else
{
// Unexpected/unknown property--Skip the propertyname and its value
reader.Skip();
if (reader.TokenType == JsonToken.StartArray || reader.TokenType == JsonToken.StartObject)
{
reader.Skip();
}
else
{
reader.Read();
}
}
}
} while (reader.TokenType != JsonToken.EndObject);
reader.Read(); // burn the EndObject token before returning back up the call stack
/*
* // Suss out all the relationship members, and which ones have what cardinality...
* IEnumerable<PropertyInfo> relations = (
* from prop in objectType.GetProperties()
* where !CanWriteTypeAsJsonApiAttribute(prop.PropertyType)
* && prop.GetCustomAttributes(true).Any(attribute => attribute is System.Runtime.Serialization.DataMemberAttribute)
* select prop
* );
* IEnumerable<PropertyInfo> hasManys = relations.Where(prop => typeof(IEnumerable<object>).IsAssignableFrom(prop.PropertyType));
* IEnumerable<PropertyInfo> belongsTos = relations.Where(prop => !typeof(IEnumerable<object>).IsAssignableFrom(prop.PropertyType));
*
* JObject links = (JObject)jo["links"];
*
* // Lets deal with belongsTos first, that should be simpler...
* foreach (PropertyInfo prop in belongsTos)
* {
* if (links == null) break; // Well, apparently we don't have any data for the relationships!
*
* string btId = (string)links[_modelManager.GetJsonKeyForProperty(prop)];
* if (btId == null)
* {
* prop.SetValue(retval, null, null); // Important that we set--the value may have been cleared!
* continue; // breaking early!
* }
* Type relType = prop.PropertyType;
* //if (typeof(EntityObject).IsAssignableFrom(relType))
* if (resolver.CanIncludeTypeAsObject(relType))
* {
* prop.SetValue(retval, resolver.GetById(relType, btId), null);
* //throw new ApplicationException(String.Format("Could not assign BelongsTo property \"{0}\" on object of type {1} by ID {2} because no object of type {3} could be retrieved by that ID.", prop.Name, objectType, btId, prop.PropertyType));
* }
* }
*/
return(retval);
}
protected void Serialize(object value, Stream writeStream, JsonWriter writer, JsonSerializer serializer, RelationAggregator aggregator)
{
writer.WriteStartObject();
// The spec no longer requires that the ID key be "id":
// "An ID SHOULD be represented by an 'id' key..." :-/
// But Ember Data does. So, we'll add "id" to the document
// always, and also serialize the property under its given
// name, for now at least.
//TODO: Partly because of this, we should probably disallow updates to Id properties where practical.
// Do the Id now...
writer.WritePropertyName("id");
var idProp = _modelManager.GetIdProperty(value.GetType());
writer.WriteValue(GetValueForIdProperty(idProp, value));
// Leverage the cached map to avoid another costly call to System.Type.GetProperties()
PropertyInfo[] props = _modelManager.GetProperties(value.GetType());
// Do non-model properties first, everything else goes in "links"
//TODO: Unless embedded???
IList <PropertyInfo> modelProps = new List <PropertyInfo>();
foreach (PropertyInfo prop in props)
{
string propKey = _modelManager.GetJsonKeyForProperty(prop);
if (propKey == "id")
{
continue; // Don't write the "id" property twice, see above!
}
if (prop.PropertyType.CanWriteAsJsonApiAttribute())
{
if (prop.GetCustomAttributes().Any(attr => attr is JsonIgnoreAttribute))
{
continue;
}
// numbers, strings, dates...
writer.WritePropertyName(propKey);
var propertyValue = prop.GetValue(value, null);
if (prop.PropertyType == typeof(Decimal) || prop.PropertyType == typeof(Decimal?))
{
if (propertyValue == null)
{
writer.WriteNull();
}
else
{
writer.WriteValue(propertyValue.ToString());
}
}
else if (prop.PropertyType == typeof(string) &&
prop.GetCustomAttributes().Any(attr => attr is SerializeStringAsRawJsonAttribute))
{
if (propertyValue == null)
{
writer.WriteNull();
}
else
{
var json = (string)propertyValue;
if (ValidateRawJsonStrings)
{
try
{
var token = JToken.Parse(json);
json = token.ToString();
}
catch (Exception)
{
json = "{}";
}
}
var valueToSerialize = JsonHelpers.MinifyJson(json);
writer.WriteRawValue(valueToSerialize);
}
}
else
{
serializer.Serialize(writer, propertyValue);
}
}
else
{
modelProps.Add(prop);
continue;
}
}
// Now do other stuff
if (modelProps.Count() > 0)
{
writer.WritePropertyName("links");
writer.WriteStartObject();
}
foreach (PropertyInfo prop in modelProps)
{
bool skip = false, iip = false;
string lt = null;
SerializeAsOptions sa = SerializeAsOptions.Ids;
object[] attrs = prop.GetCustomAttributes(true);
foreach (object attr in attrs)
{
Type attrType = attr.GetType();
if (typeof(JsonIgnoreAttribute).IsAssignableFrom(attrType))
{
skip = true;
continue;
}
if (typeof(IncludeInPayload).IsAssignableFrom(attrType))
{
iip = ((IncludeInPayload)attr).Include;
}
if (typeof(SerializeAs).IsAssignableFrom(attrType))
{
sa = ((SerializeAs)attr).How;
}
if (typeof(LinkTemplate).IsAssignableFrom(attrType))
{
lt = ((LinkTemplate)attr).TemplateString;
}
}
if (skip)
{
continue;
}
writer.WritePropertyName(_modelManager.GetJsonKeyForProperty(prop));
// Look out! If we want to SerializeAs a link, computing the property is probably
// expensive...so don't force it just to check for null early!
if (sa != SerializeAsOptions.Link && prop.GetValue(value, null) == null)
{
writer.WriteNull();
continue;
}
// Now look for enumerable-ness:
if (typeof(IEnumerable <Object>).IsAssignableFrom(prop.PropertyType))
{
switch (sa)
{
case SerializeAsOptions.Ids:
//writer.WritePropertyName(ContractResolver._modelManager.GetJsonKeyForProperty(prop));
IEnumerable <object> items = (IEnumerable <object>)prop.GetValue(value, null);
if (items == null)
{
writer.WriteValue((IEnumerable <object>)null); //TODO: Is it okay with the spec and Ember Data to return null for an empty array?
break; // LOOK OUT! Ending this case block early here!!!
}
this.WriteIdsArrayJson(writer, items, serializer);
if (iip)
{
Type itemType;
if (prop.PropertyType.IsGenericType)
{
itemType = prop.PropertyType.GetGenericArguments()[0];
}
else
{
// Must be an array at this point, right??
itemType = prop.PropertyType.GetElementType();
}
if (aggregator != null)
{
aggregator.Add(itemType, items); // should call the IEnumerable one...right?
}
}
break;
case SerializeAsOptions.Link:
if (lt == null)
{
throw new JsonSerializationException("A property was decorated with SerializeAs(SerializeAsOptions.Link) but no LinkTemplate attribute was provided.");
}
//TODO: Check for "{0}" in linkTemplate and (only) if it's there, get the Ids of all objects and "implode" them.
string href = String.Format(lt, null, GetIdFor(value));
//writer.WritePropertyName(ContractResolver._modelManager.GetJsonKeyForProperty(prop));
//TODO: Support ids and type properties in "link" object
writer.WriteStartObject();
writer.WritePropertyName("href");
writer.WriteValue(href);
writer.WriteEndObject();
break;
case SerializeAsOptions.Embedded:
// Not really supported by Ember Data yet, incidentally...but easy to implement here.
//writer.WritePropertyName(ContractResolver._modelManager.GetJsonKeyForProperty(prop));
//serializer.Serialize(writer, prop.GetValue(value, null));
this.Serialize(prop.GetValue(value, null), writeStream, writer, serializer, aggregator);
break;
}
}
else
{
var propertyValue = prop.GetValue(value, null);
if (propertyValue == null)
{
writer.WriteNull();
}
else
{
string objId = GetIdFor(propertyValue);
switch (sa)
{
case SerializeAsOptions.Ids:
//writer.WritePropertyName(ContractResolver._modelManager.GetJsonKeyForProperty(prop));
serializer.Serialize(writer, objId);
if (iip)
{
if (aggregator != null)
{
aggregator.Add(prop.PropertyType, prop.GetValue(value, null));
}
}
break;
case SerializeAsOptions.Link:
if (lt == null)
{
throw new JsonSerializationException(
"A property was decorated with SerializeAs(SerializeAsOptions.Link) but no LinkTemplate attribute was provided.");
}
string link = String.Format(lt, objId,
GetIdFor(value)); //value.GetType().GetProperty("Id").GetValue(value, null));
//writer.WritePropertyName(ContractResolver._modelManager.GetJsonKeyForProperty(prop));
writer.WriteStartObject();
writer.WritePropertyName("href");
writer.WriteValue(link);
writer.WriteEndObject();
break;
case SerializeAsOptions.Embedded:
// Not really supported by Ember Data yet, incidentally...but easy to implement here.
//writer.WritePropertyName(ContractResolver._modelManager.GetJsonKeyForProperty(prop));
//serializer.Serialize(writer, prop.GetValue(value, null));
this.Serialize(prop.GetValue(value, null), writeStream, writer, serializer, aggregator);
break;
}
}
}
}
if (modelProps.Count() > 0)
{
writer.WriteEndObject();
}
writer.WriteEndObject();
}
