code: @DoesServiceRequest
      public final String startCopy(final CloudBlob sourceBlob, final AccessCondition sourceAccessCondition,
              final AccessCondition destinationAccessCondition, FileRequestOptions options, OperationContext opContext)
              throws StorageException, URISyntaxException {
          Utility.assertNotNull("sourceBlob", sourceBlob);
  
          URI source = sourceBlob.getSnapshotQualifiedUri();
          if (sourceBlob.getServiceClient() != null && sourceBlob.getServiceClient().getCredentials() != null)
          {
              source = sourceBlob.getServiceClient().getCredentials().transformUri(sourceBlob.getSnapshotQualifiedUri());
          }
  
          return this.startCopy(source, sourceAccessCondition, destinationAccessCondition, options, opContext);
      }
docs: Requests the service to start copying a file's contents, properties, and metadata to a new file,
  using the specified access conditions, lease ID, request options, and operation context.
  
  @param sourceBlob
  A <code>CloudBlob</code> object that represents the source blob to copy.
  @param sourceAccessCondition
  An {@link AccessCondition} object that represents the access conditions for the source blob.
  @param destinationAccessCondition
  An {@link AccessCondition} object that represents the access conditions for the destination file.
  @param options
  A {@link BlobRequestOptions} object that specifies any additional options for the request.
  Specifying <code>null</code> will use the default request options from the associated
  service client ({@link CloudBlobClient}).
  @param opContext
  An {@link OperationContext} object that represents the context for the current operation.
  This object is used to track requests to the storage service, and to provide additional
  runtime information about the operation.
  
  @return A <code>String</code> which represents the copy ID associated with the copy operation.
  
  @throws StorageException
  If a storage service error occurred.
  @throws URISyntaxException