public boolean isRootId(long fileId) {
    Preconditions.checkNotNull(mState.getRoot(),
        PreconditionMessage.INODE_TREE_UNINITIALIZED_IS_ROOT_ID);
    return fileId == mState.getRoot().getId();
  }
public boolean isRootId ( long fileId ) { Preconditions . checkNotNull ( mState . getRoot ( ) , PreconditionMessage . INODE_TREE_UNINITIALIZED_IS_ROOT_ID ) ; return fileId == mState . getRoot ( ) . getId ( ) ; }
@param fileId the file id to check
@return true if the given file id is the root id