/**
* If <code>f</code> is a file, this method will make a single call to S3. If <code>f</code> is a
* directory, this method will make a maximum of (<i>n</i> / 1000) + 2 calls to S3, where <i>n</i>
* is the total number of files and directories contained directly in <code>f</code>.
*/
@Override
public FileStatus[] listStatus(Path f) throws IOException {
Path absolutePath = makeAbsolute(f);
String key = pathToKey(absolutePath);
if (key.length() > 0) {
FileMetadata meta = store.retrieveMetadata(key);
if (meta != null) {
return new FileStatus[] {newFile(meta, absolutePath)};
}
}
URI pathUri = absolutePath.toUri();
Set<FileStatus> status = new TreeSet<FileStatus>();
String priorLastKey = null;
do {
PartialListing listing = store.list(key, S3_MAX_LISTING_LENGTH, priorLastKey, false);
for (FileMetadata fileMetadata : listing.getFiles()) {
Path subpath = keyToPath(fileMetadata.getKey());
String relativePath = pathUri.relativize(subpath.toUri()).getPath();
if (fileMetadata.getKey().equals(key + "/")) {
// this is just the directory we have been asked to list
} else if (relativePath.endsWith(FOLDER_SUFFIX)) {
status.add(
newDirectory(
new Path(
absolutePath,
relativePath.substring(0, relativePath.indexOf(FOLDER_SUFFIX)))));
} else {
status.add(newFile(fileMetadata, subpath));
}
}
for (String commonPrefix : listing.getCommonPrefixes()) {
Path subpath = keyToPath(commonPrefix);
String relativePath = pathUri.relativize(subpath.toUri()).getPath();
status.add(newDirectory(new Path(absolutePath, relativePath)));
}
priorLastKey = listing.getPriorLastKey();
} while (priorLastKey != null);
if (status.isEmpty()
&& key.length() > 0
&& store.retrieveMetadata(key + FOLDER_SUFFIX) == null) {
throw new FileNotFoundException("File " + f + " does not exist.");
}
return status.toArray(new FileStatus[status.size()]);
}
@Override
public FileStatus getFileStatus(Path f) throws IOException {
Path absolutePath = makeAbsolute(f);
String key = pathToKey(absolutePath);
if (key.length() == 0) { // root always exists
return newDirectory(absolutePath);
}
if (LOG.isDebugEnabled()) {
LOG.debug("getFileStatus retrieving metadata for key '" + key + "'");
}
FileMetadata meta = store.retrieveMetadata(key);
if (meta != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("getFileStatus returning 'file' for key '" + key + "'");
}
return newFile(meta, absolutePath);
}
if (store.retrieveMetadata(key + FOLDER_SUFFIX) != null) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"getFileStatus returning 'directory' for key '"
+ key
+ "' as '"
+ key
+ FOLDER_SUFFIX
+ "' exists");
}
return newDirectory(absolutePath);
}
if (LOG.isDebugEnabled()) {
LOG.debug("getFileStatus listing key '" + key + "'");
}
PartialListing listing = store.list(key, 1);
if (listing.getFiles().length > 0 || listing.getCommonPrefixes().length > 0) {
if (LOG.isDebugEnabled()) {
LOG.debug("getFileStatus returning 'directory' for key '" + key + "' as it has contents");
}
return newDirectory(absolutePath);
}
if (LOG.isDebugEnabled()) {
LOG.debug("getFileStatus could not find key '" + key + "'");
}
throw new FileNotFoundException("No such file or directory '" + absolutePath + "'");
}