/** default maxResults is 1000 */
@Override
public ListenableFuture<PageSet<? extends StorageMetadata>> list(
final String container, ListContainerOptions options) {
// Check if the container exists
if (!containerExistsSyncImpl(container)) {
return immediateFailedFuture(cnfe(container));
}
// Loading blobs from container
Iterable<String> blobBelongingToContainer = null;
try {
blobBelongingToContainer = storageStrategy.getBlobKeysInsideContainer(container);
} catch (IOException e) {
logger.error(e, "An error occurred loading blobs contained into container %s", container);
Throwables.propagate(e);
}
SortedSet<StorageMetadata> contents =
newTreeSet(
transform(
blobBelongingToContainer,
new Function<String, StorageMetadata>() {
public StorageMetadata apply(String key) {
Blob oldBlob = loadFileBlob(container, key);
checkState(
oldBlob != null,
"blob "
+ key
+ " is not present although it was in the list of "
+ container);
checkState(
oldBlob.getMetadata() != null,
"blob " + container + "/" + key + " has no metadata");
MutableBlobMetadata md = copy(oldBlob.getMetadata());
String directoryName = ifDirectoryReturnName.execute(md);
if (directoryName != null) {
md.setName(directoryName);
md.setType(StorageType.RELATIVE_PATH);
}
return md;
}
}));
String marker = null;
if (options != null) {
if (options.getMarker() != null) {
final String finalMarker = options.getMarker();
StorageMetadata lastMarkerMetadata =
find(
contents,
new Predicate<StorageMetadata>() {
public boolean apply(StorageMetadata metadata) {
return metadata.getName().equals(finalMarker);
}
});
contents = contents.tailSet(lastMarkerMetadata);
contents.remove(lastMarkerMetadata);
}
final String prefix = options.getDir();
if (prefix != null) {
contents =
newTreeSet(
filter(
contents,
new Predicate<StorageMetadata>() {
public boolean apply(StorageMetadata o) {
return (o != null
&& o.getName().startsWith(prefix)
&& !o.getName().equals(prefix));
}
}));
}
Integer maxResults = options.getMaxResults() != null ? options.getMaxResults() : 1000;
if (contents.size() > 0) {
SortedSet<StorageMetadata> contentsSlice = firstSliceOfSize(contents, maxResults);
if (!contentsSlice.contains(contents.last())) {
// Partial listing
marker = contentsSlice.last().getName();
} else {
marker = null;
}
contents = contentsSlice;
}
final String delimiter = options.isRecursive() ? null : File.separator;
if (delimiter != null) {
SortedSet<String> commonPrefixes = null;
Iterable<String> iterable =
transform(contents, new CommonPrefixes(prefix != null ? prefix : null, delimiter));
commonPrefixes = iterable != null ? newTreeSet(iterable) : new TreeSet<String>();
commonPrefixes.remove(CommonPrefixes.NO_PREFIX);
contents =
newTreeSet(
filter(contents, new DelimiterFilter(prefix != null ? prefix : null, delimiter)));
Iterables.<StorageMetadata>addAll(
contents,
transform(
commonPrefixes,
new Function<String, StorageMetadata>() {
public StorageMetadata apply(String o) {
MutableStorageMetadata md = new MutableStorageMetadataImpl();
md.setType(StorageType.RELATIVE_PATH);
md.setName(o);
return md;
}
}));
}
// trim metadata, if the response isn't supposed to be detailed.
if (!options.isDetailed()) {
for (StorageMetadata md : contents) {
md.getUserMetadata().clear();
}
}
}
return Futures.<PageSet<? extends StorageMetadata>>immediateFuture(
new PageSetImpl<StorageMetadata>(contents, marker));
}
