LocalMetadataStore#put(DirListingMetadata) should also put file metadata into fileHash.

LocalMetadataStore#put(DirListingMetadata) only puts the metadata into dirHash, thus all FileStatus s are missing from LocalMedataStore#fileHash(), which makes it confuse to use.

So in the current way, to correctly put file status into the store (and also set authoriative flag), you need to run

List<PathMetadata> metas = new ArrayList<PathMetadata>();
boolean authorizative = true;
for (S3AFileStatus status : files) {
   PathMetadata meta = new PathMetadata(status);
   store.put(meta);
}
DirListingMetadata dirMeta = new DirMeta(parent, metas, authorizative);
store.put(dirMeta);

Since solely calling store.put(dirMeta) is not correct, and calling store.put(dirMeta); after putting all sub-file FileStatuss does the repetitive jobs. Can we just use a put(PathMetadata) and a get/setAuthorative() in the MetadataStore interface instead?