private static bool TryToPrimitiveList(AttributeValue attributeValue, out PrimitiveList primitiveList)
{
primitiveList = null;
Primitive primitive;
if (attributeValue.IsSetSS())
{
primitiveList = new PrimitiveList(DynamoDBEntryType.String);
foreach (string item in attributeValue.SS)
{
primitive = new Primitive(item);
primitiveList.Add(primitive);
}
}
else if (attributeValue.IsSetNS())
{
primitiveList = new PrimitiveList(DynamoDBEntryType.Numeric);
foreach (string item in attributeValue.NS)
{
primitive = new Primitive(item, true);
primitiveList.Add(primitive);
}
}
else if (attributeValue.IsSetBS())
{
primitiveList = new PrimitiveList(DynamoDBEntryType.Binary);
foreach (MemoryStream item in attributeValue.BS)
{
primitive = new Primitive(item);
primitiveList.Add(primitive);
}
}
return(primitiveList != null);
}
internal static DynamoDBEntry AttributeValueToDynamoDBEntry(AttributeValue attributeValue)
{
Primitive primitive = null;
if (attributeValue.S != null)
{
primitive = new Primitive(attributeValue.S);
}
else if (attributeValue.N != null)
{
primitive = new Primitive(attributeValue.N, true);
}
else if (attributeValue.B != null)
{
primitive = new Primitive(attributeValue.B);
}
if (primitive != null)
{
return(primitive);
}
PrimitiveList primitiveList = null;
if (attributeValue.SS != null && attributeValue.SS.Count != 0)
{
primitiveList = new PrimitiveList(DynamoDBEntryType.String);
foreach (string item in attributeValue.SS)
{
primitive = new Primitive(item);
primitiveList.Add(primitive);
}
}
else if (attributeValue.NS != null && attributeValue.NS.Count != 0)
{
primitiveList = new PrimitiveList(DynamoDBEntryType.Numeric);
foreach (string item in attributeValue.NS)
{
primitive = new Primitive(item, true);
primitiveList.Add(primitive);
}
}
else if (attributeValue.BS != null && attributeValue.BS.Count != 0)
{
primitiveList = new PrimitiveList(DynamoDBEntryType.Binary);
foreach (MemoryStream item in attributeValue.BS)
{
primitive = new Primitive(item);
primitiveList.Add(primitive);
}
}
if (primitiveList != null)
{
return(primitiveList);
}
return(null);
}
// Attempts to decode a particular DynamoDBEntry.
// May throw exceptions, in particular if the data is not base64 encoded
private static bool TryDecodeBase64(DynamoDBEntry entry, out DynamoDBEntry decodedEntry)
{
decodedEntry = null;
// Convert string primitive (S) to binary primitive (B)
var primitive = entry as Primitive;
if (primitive != null && primitive.Type == DynamoDBEntryType.String)
{
// Decode the contents
var base64 = primitive.Value as string;
byte[] bytes;
if (!TryDecodeBase64(base64, out bytes))
{
return(false);
}
// Store as binary primitive (B)
decodedEntry = new Primitive(bytes);
return(true);
}
// Convert string set (SS) to binary set (BS)
var primitiveList = entry as PrimitiveList;
if (primitiveList != null && primitiveList.Type == DynamoDBEntryType.String)
{
var decodedList = new PrimitiveList(DynamoDBEntryType.Binary);
foreach (var item in primitiveList.Entries)
{
// Attempt to decode
DynamoDBEntry decodedItem;
if (!TryDecodeBase64(item, out decodedItem))
{
return(false);
}
// The decoded item must be a Primitive
Primitive decodedPrimitive = decodedItem as Primitive;
if (decodedPrimitive == null)
{
return(false);
}
decodedList.Add(decodedPrimitive);
}
decodedEntry = decodedList;
return(true);
}
// In a given list (L), convert every string primitive (S) to binary primitive (B)
// Non-strings and strings that cannot be converted will be left as-is
var dynamoDBList = entry as DynamoDBList;
if (dynamoDBList != null)
{
var decodedList = new DynamoDBList();
foreach (var item in dynamoDBList.Entries)
{
DynamoDBEntry decodedItem;
if (!TryDecodeBase64(item, out decodedItem))
{
// if decoding could not succeed, store same item
decodedItem = item;
}
decodedList.Add(decodedItem);
}
decodedEntry = decodedList;
return(true);
}
return(false);
}
