/// <summary>
/// The <see cref="ToAttributeValue(object,Type,DynamoSerializerOptions)"/> method converts an instance to a DynamoDB attribute value.
/// </summary>
/// <param name="value">The value to convert.</param>
/// <param name="targetType">The source value type.</param>
/// <param name="options">The serialization options.</param>
/// <returns>A DynamoDB attribute value, or <c>null</c> if the instance state cannot be represented in DynamoDB.</returns>
public override AttributeValue ToAttributeValue(object value, Type targetType, DynamoSerializerOptions options)
{
var mapObject = new Dictionary <string, AttributeValue>();
foreach (var property in targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.FlattenHierarchy))
{
var propertyAttributes = property.GetCustomAttributes();
// check if this object property should be ignored
if (!(propertyAttributes.OfType <DynamoPropertyIgnoreAttribute>().SingleOrDefault() is null))
{
continue;
}
var propertyValue = property.GetValue(value);
if (!(propertyValue is null) || !options.IgnoreNullValues)
{
var attributeValue = DynamoSerializer.Serialize(propertyValue, options);
if (!(attributeValue is null))
{
// check if this object property has a custom name
var name = propertyAttributes.OfType <DynamoPropertyNameAttribute>().SingleOrDefault()?.Name ?? property.Name;
mapObject.Add(name, attributeValue);
}
}
}
return(new AttributeValue {
M = mapObject,
IsMSet = true
});
}
/// <summary>
/// The <see cref="ToAttributeValue(object,Type,DynamoSerializerOptions)"/> method converts an instance to a DynamoDB attribute value.
/// </summary>
/// <param name="value">The value to convert.</param>
/// <param name="targetType">The source value type.</param>
/// <param name="options">The serialization options.</param>
/// <returns>A DynamoDB attribute value, or <c>null</c> if the instance state cannot be represented in DynamoDB.</returns>
public override AttributeValue ToAttributeValue(object value, Type targetType, DynamoSerializerOptions options)
{
var mapDictionary = new Dictionary <string, AttributeValue>();
foreach (DictionaryEntry?entry in (IDictionary)value)
{
if (entry is null)
{
continue;
}
var entryValue = entry?.Value;
if (!(entryValue is null) || !options.IgnoreNullValues)
{
var entryKey = entry?.Key as string;
if (entryKey is null)
{
throw new DynamoSerializationException("null key is not supported");
}
var attributeValue = DynamoSerializer.Serialize(entryValue, options);
if (attributeValue != null)
{
mapDictionary.Add(entryKey, attributeValue);
}
}
}
return(new AttributeValue {
M = mapDictionary,
IsMSet = true
});
}
/// <summary>
/// The <see cref="ToAttributeValue(object,Type,DynamoSerializerOptions)"/> method converts an instance to a DynamoDB attribute value.
/// </summary>
/// <param name="value">The value to convert.</param>
/// <param name="targetType">The source value type.</param>
/// <param name="options">The serialization options.</param>
/// <returns>A DynamoDB attribute value, or <c>null</c> if the instance state cannot be represented in DynamoDB.</returns>
public override AttributeValue ToAttributeValue(object value, Type targetType, DynamoSerializerOptions options)
{
var list = new List <AttributeValue>();
foreach (var item in (IEnumerable)value)
{
var attributeValue = DynamoSerializer.Serialize(item, options);
list.Add(attributeValue ?? new AttributeValue {
NULL = true
});
}
return(new AttributeValue {
L = list,
IsLSet = true
});
}
internal Dictionary <string, AttributeValue> SerializeItem <TRecord>(TRecord record, DynamoPrimaryKey <TRecord> primaryKey)
where TRecord : class
{
var attributes = DynamoSerializer.Serialize(record, SerializerOptions)?.M;
if (attributes is null)
{
throw new ArgumentException("cannot serialize null record", nameof(record));
}
// add type details
attributes["_t"] = new AttributeValue(Options.GetShortTypeName(typeof(TRecord)));
// add modified details
attributes["_m"] = new AttributeValue {
N = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().ToString(CultureInfo.InvariantCulture)
};
// add primary key details
attributes[primaryKey.PKName] = new AttributeValue(primaryKey.PKValue);
attributes[primaryKey.SKName] = new AttributeValue(primaryKey.SKValue);
return(attributes);
}