/**
* Returns a result segment of an enumerable collection of files and directories for this
* directory, using the specified listing details options, request options, and operation context.
*
* @param maxResults The maximum number of results to retrieve.
* @param continuationToken A {@link ResultContinuation} object that represents a continuation
* token returned by a previous listing operation.
* @param options A {@link FileRequestOptions} 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 CloudFileClient}).
* @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 {@link ResultSegment} object that contains a segment of the enumerable collection of
* {@link ListFileItem} objects that represent the files and directories in this directory.
* @throws StorageException If a storage service error occurred.
*/
public ResultSegment<ListFileItem> listFilesAndDirectoriesSegmented(
final int maxResults,
final ResultContinuation continuationToken,
FileRequestOptions options,
OperationContext opContext)
throws StorageException {
if (opContext == null) {
opContext = new OperationContext();
}
opContext.initialize();
options = FileRequestOptions.applyDefaults(options, this.fileServiceClient);
Utility.assertContinuationType(continuationToken, ResultContinuationType.FILE);
SegmentedStorageRequest segmentedRequest = new SegmentedStorageRequest();
segmentedRequest.setToken(continuationToken);
return ExecutionEngine.executeWithRetry(
this.fileServiceClient,
this,
this.listFilesAndDirectoriesSegmentedImpl(maxResults, options, segmentedRequest),
options.getRetryPolicyFactory(),
opContext);
}
private StorageRequest<CloudFileClient, CloudFileDirectory, ResultSegment<ListFileItem>>
listFilesAndDirectoriesSegmentedImpl(
final int maxResults,
final FileRequestOptions options,
final SegmentedStorageRequest segmentedRequest) {
Utility.assertContinuationType(segmentedRequest.getToken(), ResultContinuationType.FILE);
final ListingContext listingContext = new ListingContext(null, maxResults);
final StorageRequest<CloudFileClient, CloudFileDirectory, ResultSegment<ListFileItem>>
getRequest =
new StorageRequest<CloudFileClient, CloudFileDirectory, ResultSegment<ListFileItem>>(
options, this.getStorageUri()) {
@Override
public void setRequestLocationMode() {
this.setRequestLocationMode(
Utility.getListingLocationMode(segmentedRequest.getToken()));
}
@Override
public HttpURLConnection buildRequest(
CloudFileClient client, CloudFileDirectory directory, OperationContext context)
throws Exception {
listingContext.setMarker(
segmentedRequest.getToken() != null
? segmentedRequest.getToken().getNextMarker()
: null);
return FileRequest.listFilesAndDirectories(
directory.getUri(), options, context, listingContext);
}
@Override
public void signRequest(
HttpURLConnection connection, CloudFileClient client, OperationContext context)
throws Exception {
StorageRequest.signBlobQueueAndFileRequest(connection, client, -1L, null);
}
@Override
public ResultSegment<ListFileItem> preProcessResponse(
CloudFileDirectory directory, CloudFileClient client, OperationContext context)
throws Exception {
if (this.getResult().getStatusCode() != HttpURLConnection.HTTP_OK) {
this.setNonExceptionedRetryableFailure(true);
}
return null;
}
@Override
public ResultSegment<ListFileItem> postProcessResponse(
HttpURLConnection connection,
CloudFileDirectory directory,
CloudFileClient client,
OperationContext context,
ResultSegment<ListFileItem> storageObject)
throws Exception {
final ListResponse<ListFileItem> response =
FileListHandler.getFileAndDirectoryList(
this.getConnection().getInputStream(), directory);
ResultContinuation newToken = null;
if (response.getNextMarker() != null) {
newToken = new ResultContinuation();
newToken.setNextMarker(response.getNextMarker());
newToken.setContinuationType(ResultContinuationType.FILE);
newToken.setTargetLocation(this.getResult().getTargetLocation());
}
final ResultSegment<ListFileItem> resSegment =
new ResultSegment<ListFileItem>(response.getResults(), maxResults, newToken);
// Important for listFilesAndDirectories because this is required by the lazy
// iterator between executions.
segmentedRequest.setToken(resSegment.getContinuationToken());
return resSegment;
}
};
return getRequest;
}
