private Func <object, byte[]> GenerateSerializer(Type type)
{
var typeCode = Type.GetTypeCode(type);
switch (typeCode)
{
case TypeCode.Boolean:
return(value => ValueSerialization.Serialize(ColumnType.Boolean, value));
case TypeCode.Decimal:
return(value => ValueSerialization.Serialize(ColumnType.Decimal, value));
case TypeCode.Double:
return(value => ValueSerialization.Serialize(ColumnType.Double, value));
case TypeCode.Single:
return(value => ValueSerialization.Serialize(ColumnType.Float, value));
case TypeCode.Char:
return(value => ValueSerialization.Serialize(ColumnType.Int, (int)(char)value));
case TypeCode.Byte:
return(value => ValueSerialization.Serialize(ColumnType.Int, (int)(byte)value));
case TypeCode.SByte:
return(value => ValueSerialization.Serialize(ColumnType.Int, (int)(sbyte)value));
case TypeCode.UInt16:
return(value => ValueSerialization.Serialize(ColumnType.Int, (int)(ushort)value));
case TypeCode.Int16:
return(value => ValueSerialization.Serialize(ColumnType.Int, (int)(short)value));
case TypeCode.Int32:
return(value => ValueSerialization.Serialize(ColumnType.Int, value));
case TypeCode.UInt32:
return(value => ValueSerialization.Serialize(ColumnType.Bigint, (long)(uint)value));
case TypeCode.Int64:
return(value => ValueSerialization.Serialize(ColumnType.Bigint, value));
case TypeCode.String:
return(value => ValueSerialization.Serialize(ColumnType.Varchar, value));
case TypeCode.DateTime:
return(value => ValueSerialization.Serialize(ColumnType.Timestamp, value));
case TypeCode.Empty:
return(null);
default:
return(GenerateObjectSerializer(type));
}
}
private Func <byte[], object> GenerateObjectDeserializer(Type type)
{
var customSerializer = type.GetCustomAttributes(typeof(CassandraTypeSerializerAttribute), false).FirstOrDefault() as CassandraTypeSerializerAttribute;
if (customSerializer != null)
{
return(value => customSerializer.Serializer.Deserialize(value));
}
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable <>))
{
return(GenerateDeserializer(type.GetGenericArguments()[0]));
}
if (typeof(Guid).IsAssignableFrom(type))
{
return(value => ValueSerialization.Deserialize(ColumnType.Uuid, value));
}
if (typeof(IPAddress).IsAssignableFrom(type))
{
return(value => ValueSerialization.Deserialize(ColumnType.Inet, value));
}
if (typeof(Enum).IsAssignableFrom(type))
{
var enumType = type.GetEnumUnderlyingType();
return(GenerateDeserializer(enumType));
}
if (typeof(byte[]).IsAssignableFrom(type))
{
return(value => ValueSerialization.Deserialize(ColumnType.Blob, value));
}
if (typeof(IDictionary).IsAssignableFrom(type))
{
var dictionaryTypeDef = type.GetInterfaces().FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IDictionary <,>));
if (dictionaryTypeDef != null)
{
var dictionaryArgs = dictionaryTypeDef.GetGenericArguments();
var keyDeserializer = GenerateDeserializer(dictionaryArgs[0]);
var valueDeserializer = GenerateDeserializer(dictionaryArgs[1]);
return(rawData =>
{
var res = (IDictionary)Activator.CreateInstance(type);
return ValueSerialization.DeserializeMap(rawData, res, keyDeserializer, valueDeserializer);
});
}
}
if (typeof(IList).IsAssignableFrom(type))
{
var listTypeDef = type.GetInterfaces().FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IList <>));
if (listTypeDef != null)
{
var listItemType = listTypeDef.GetGenericArguments()[0];
var valueSerializer = GenerateDeserializer(listItemType);
return(rawData =>
{
var res = (IList)Activator.CreateInstance(type);
return ValueSerialization.DeserializeList(rawData, res, valueSerializer);
});
}
}
var hashSetTypeDef = type.GetInterfaces().FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(ISet <>));
if (hashSetTypeDef != null)
{
var setItemType = hashSetTypeDef.GetGenericArguments()[0];
var valueDeserializer = GenerateDeserializer(setItemType);
return(rawData =>
{
var hashSet = Activator.CreateInstance(type);
Type accessorType = typeof(HashSetAccessor <>).MakeGenericType(setItemType);
var setAccessor = (IHashSetAccessor)Activator.CreateInstance(accessorType, hashSet);
ValueSerialization.DeserializeSet(rawData, setAccessor, valueDeserializer);
return hashSet;
});
}
throw new NotSupportedException(string.Format("Type {0} neither belongs to Cassandra native types nor has custom serializer defined. Use CassandraTypeSerializerAttribute to define custom type serializer to store data inside Blob column.", type.FullName));
}
