@Override
public boolean rename(Path src, Path dst) throws IOException {
Path absoluteSrc = makeAbsolute(src);
INode srcINode = store.retrieveINode(absoluteSrc);
if (srcINode == null) {
// src path doesn't exist
return false;
}
Path absoluteDst = makeAbsolute(dst);
INode dstINode = store.retrieveINode(absoluteDst);
if (dstINode != null && dstINode.isDirectory()) {
absoluteDst = new Path(absoluteDst, absoluteSrc.getName());
dstINode = store.retrieveINode(absoluteDst);
}
if (dstINode != null) {
// dst path already exists - can't overwrite
return false;
}
Path dstParent = absoluteDst.getParent();
if (dstParent != null) {
INode dstParentINode = store.retrieveINode(dstParent);
if (dstParentINode == null || dstParentINode.isFile()) {
// dst parent doesn't exist or is a file
return false;
}
}
return renameRecursive(absoluteSrc, absoluteDst);
}
public boolean delete(Path path, boolean recursive) throws IOException {
Path absolutePath = makeAbsolute(path);
INode inode = store.retrieveINode(absolutePath);
if (inode == null) {
return false;
}
if (inode.isFile()) {
store.deleteINode(absolutePath);
for (Block block : inode.getBlocks()) {
store.deleteBlock(block);
}
} else {
FileStatus[] contents = listStatus(absolutePath);
if (contents == null) {
return false;
}
if ((contents.length != 0) && (!recursive)) {
throw new IOException("Directory " + path.toString() + " is not empty.");
}
for (FileStatus p : contents) {
if (!delete(p.getPath(), recursive)) {
return false;
}
}
store.deleteINode(absolutePath);
}
return true;
}
@Override
public boolean isFile(Path path) throws IOException {
INode inode = store.retrieveINode(makeAbsolute(path));
if (inode == null) {
return false;
}
return inode.isFile();
}
private INode checkFile(Path path) throws IOException {
INode inode = store.retrieveINode(makeAbsolute(path));
if (inode == null) {
throw new IOException("No such file.");
}
if (inode.isDirectory()) {
throw new IOException("Path " + path + " is a directory.");
}
return inode;
}
private boolean renameRecursive(Path src, Path dst) throws IOException {
INode srcINode = store.retrieveINode(src);
store.storeINode(dst, srcINode);
store.deleteINode(src);
if (srcINode.isDirectory()) {
for (Path oldSrc : store.listDeepSubPaths(src)) {
INode inode = store.retrieveINode(oldSrc);
if (inode == null) {
return false;
}
String oldSrcPath = oldSrc.toUri().getPath();
String srcPath = src.toUri().getPath();
String dstPath = dst.toUri().getPath();
Path newDst = new Path(oldSrcPath.replaceFirst(srcPath, dstPath));
store.storeINode(newDst, inode);
store.deleteINode(oldSrc);
}
}
return true;
}
private boolean mkdir(Path path) throws IOException {
Path absolutePath = makeAbsolute(path);
INode inode = store.retrieveINode(absolutePath);
if (inode == null) {
store.storeINode(absolutePath, INode.DIRECTORY_INODE);
} else if (inode.isFile()) {
throw new IOException(
String.format("Can't make directory for path %s since it is a file.", absolutePath));
}
return true;
}
/** FileStatus for Oss file systems. */
@Override
public FileStatus getFileStatus(Path f) throws IOException {
Path absolutePath = makeAbsolute(f);
String key = JetOssFileSystemStore.pathToKey(absolutePath);
if (key.length() == 0) { // root always exists
return new OssFileStatus(f.makeQualified(this), INode.DIRECTORY_INODE);
}
INode inode = store.retrieveINode(makeAbsolute(f));
if (inode == null) {
throw new FileNotFoundException(f + ": No such file or directory.");
}
return new OssFileStatus(f.makeQualified(this), inode);
}
@Override
public FileStatus[] listStatus(Path f) throws IOException {
Path absolutePath = makeAbsolute(f);
INode inode = store.retrieveINode(absolutePath);
if (inode == null) {
return new FileStatus[0];
}
if (inode.isFile()) {
return new FileStatus[] {new OssFileStatus(f.makeQualified(this), inode)};
}
ArrayList<FileStatus> ret = new ArrayList<FileStatus>();
for (Path p : store.listSubPaths(absolutePath)) {
// Here, we need to convert "file/path" to "/file/path".
// Otherwise, Path.makeQualified will throw `URISyntaxException`.
Path modifiedPath = new Path("/" + p.toString());
ret.add(getFileStatus(modifiedPath.makeQualified(this)));
}
return ret.toArray(new FileStatus[0]);
}
/** @param permission Currently ignored. */
@Override
public FSDataOutputStream create(
Path file,
FsPermission permission,
boolean overwrite,
int bufferSize,
short replication,
long blockSize,
Progressable progress)
throws IOException {
this.blocksForOneTime.clear();
INode inode = store.retrieveINode(makeAbsolute(file));
if (inode != null) {
if (overwrite) {
delete(file);
} else {
throw new IOException("File already exists: " + file);
}
} else {
Path parent = file.getParent();
if (parent != null) {
if (!mkdirs(parent)) {
throw new IOException("Mkdirs failed to create " + parent.toString());
}
}
}
return new FSDataOutputStream(
new OssOutputStream(
getConf(),
store,
makeAbsolute(file),
blockSize,
progress,
bufferSize,
blocksForOneTime),
statistics);
}