import org.apache.hadoop.fs.FileUtil; //導入方法依賴的package包/類

@Override

public boolean delete(Path p, boolean recursive) throws IOException {

if (LOG.isDebugEnabled()) {

LOG.debug(String.format("EFS:delete: %s %b", p, recursive));

}

// The super delete uses the FileUtil.fullyDelete,

// but we cannot rely on that because we need to use the elevated

// operations to remove the files

//

File f = pathToFile(p);

if (!f.exists()) {

//no path, return false "nothing to delete"

return false;

}

else if (f.isFile()) {

return Native.Elevated.deleteFile(p);

}

else if (f.isDirectory()) {

// This is a best-effort attempt. There are race conditions in that

// child files can be created/deleted after we snapped the list.

// No need to protect against that case.

File[] files = FileUtil.listFiles(f);

int childCount = files.length;

if (recursive) {

for(File child:files) {

if (delete(new Path(child.getPath()), recursive)) {

--childCount;

}

}

}

if (childCount == 0) {

return Native.Elevated.deleteDirectory(p);

}

else {

throw new IOException("Directory " + f.toString() + " is not empty");

}

}

else {

// This can happen under race conditions if an external agent

// is messing with the file type between IFs

throw new IOException("Path " + f.toString() +

" exists, but is neither a file nor a directory");

}

}

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