void ThrowIfItemNotFound()
{
if (!_file.Exists)
{
throw StreamingErrors.ItemNotFound(this);
}
}
/// <summary>
/// Attempts to read the storage item.
/// </summary>
/// <param name="reader">The reader.</param>
/// <param name="condition">The condition.</param>
/// <exception cref="StreamingItemNotFoundException">if the item does not exist.</exception>
/// <exception cref="StreamingContainerNotFoundException">if the container for the item does not exist</exception>
/// <exception cref="StreamingItemIntegrityException">when integrity check fails</exception>
public void ReadInto(ReaderDelegate reader, StreamingCondition condition)
{
try
{
var mapped = Map(condition);
BlobStorageUtil.Read(mapped, _blob, reader);
}
catch (StreamingItemIntegrityException e)
{
throw StreamingErrors.IntegrityFailure(this, e);
}
catch (StorageClientException e)
{
switch (e.ErrorCode)
{
case StorageErrorCode.ContainerNotFound:
throw StreamingErrors.ContainerNotFound(this, e);
case StorageErrorCode.ResourceNotFound:
case StorageErrorCode.BlobNotFound:
throw StreamingErrors.ItemNotFound(this, e);
case StorageErrorCode.ConditionFailed:
throw StreamingErrors.ConditionFailed(this, condition, e);
case StorageErrorCode.ServiceIntegrityCheckFailed:
throw StreamingErrors.IntegrityFailure(this, e);
case StorageErrorCode.BadRequest:
switch (e.StatusCode)
{
// for some reason Azure Storage happens to get here as well
case HttpStatusCode.PreconditionFailed:
case HttpStatusCode.NotModified:
throw StreamingErrors.ConditionFailed(this, condition, e);
default:
throw;
}
default:
throw;
}
}
}
public void CopyFrom(IStreamingItem sourceItem,
StreamingCondition condition,
StreamingCondition copySourceCondition,
StreamingWriteOptions writeOptions)
{
var item = sourceItem as BlobStreamingItem;
if (item != null)
{
try
{
_blob.CopyFromBlob(item._blob, Map(condition, copySourceCondition));
}
catch (StorageClientException e)
{
switch (e.ErrorCode)
{
case StorageErrorCode.BlobNotFound:
throw StreamingErrors.ItemNotFound(this, e);
default:
throw;
}
}
}
else
{
// based on the default write block size of BLOB
const int bufferSize = 0x400000;
Write(
targetStream =>
sourceItem.ReadInto(
(props, stream) => stream.CopyTo(targetStream, bufferSize),
copySourceCondition), condition,
writeOptions);
}
}
