import com.microsoft.azure.storage.blob.DeleteSnapshotsOption; //导入依赖的package包/类
@Override
public void purge(String prefix) throws IOException {
  try {

    // Attempts to purge may occur before opening any streams so first,
    // check if a session exists, if not create a session with the Azure
    // storage server.
    if (null == storageInteractionLayer) {
      final String errMsg = String.format(
          "Storage session expected for URI '%s' but does not exist.",
          sessionUri);
      throw new AssertionError(errMsg);
    }

    if (checkContainer(ContainerAccessType.ReadThenWrite) == ContainerState.DoesntExist) {
      // Container doesn't exist, no need to do anything.
      return;
    }
    // Get all blob items with the given prefix from the container and delete
    // them.
    Iterable<ListBlobItem> objects = listRootBlobs(prefix, false);
    for (ListBlobItem blobItem : objects) {
      ((CloudBlob) blobItem).delete(DeleteSnapshotsOption.NONE, null, null,
          getInstrumentedContext());
    }
  } catch (Exception e) {
    // Re-throw as an Azure storage exception.
    //
    throw new AzureException(e);
  }
}
 

import com.microsoft.azure.storage.blob.DeleteSnapshotsOption; //导入依赖的package包/类
@Override
public void delete(OperationContext opContext, SelfRenewingLease lease)
    throws StorageException {
  getBlob().delete(DeleteSnapshotsOption.NONE, getLeaseCondition(lease),
      null, opContext);
}