// Query/Scan filter creation
private static ScanFilter ComposeScanFilter(IEnumerable <ScanCondition> conditions, ItemStorageConfig storageConfig)
{
ScanFilter filter = new ScanFilter();
foreach (var condition in conditions)
{
PropertyStorage propertyStorage = storageConfig.GetPropertyStorage(condition.PropertyName);
List <AttributeValue> attributeValues = new List <AttributeValue>();
foreach (var value in condition.Values)
{
var entry = ToDynamoDBEntry(propertyStorage, value, true);
if (entry == null)
{
throw new InvalidOperationException(
string.Format("Unable to convert value corresponding to property [{0}] to DynamoDB representation", condition.PropertyName));
}
AttributeValue nativeValue = entry.ConvertToAttributeValue();
if (nativeValue != null)
{
attributeValues.Add(nativeValue);
}
}
filter.AddCondition(propertyStorage.AttributeName, condition.Operator, attributeValues);
}
return(filter);
}
// Key creation
private static DynamoDBEntry ValueToDynamoDBEntry(string propertyName, object value, ItemStorageConfig storageConfig)
{
PropertyStorage propertyStorage = storageConfig.GetPropertyStorage(propertyName);
var entry = ToDynamoDBEntry(propertyStorage, value);
return(entry);
}