Design an in-memory file system to simulate the following functions:
ls
: Given a path in string format. If it is a file path, return a list that only
contains this file's name. If it is a directory path, return the list of file and
directory names in this directory. Your output (file and directory names together)
should in lexicographic order.
mkdir
: Given a directory path that does not exist, you should make a new
directory according to the path. If the middle directories in the path don't exist
either, you should create them as well. This function has void return type.
addContentToFile
: Given a file path and file content in string
format. If the file doesn't exist, you need to create that file containing given
content. If the file already exists, you need to append given content to original
content. This function has void return type.
readContentFromFile
: Given a file path, return its content in
string format.
Example:
Input: ["FileSystem","ls","mkdir","addContentToFile","ls","readContentFromFile"] [[],["/"],["/a/b/c"],["/a/b/c/d","hello"],["/"],["/a/b/c/d"]] Output: [null,[],null,null,["a"],"hello"] Explanation:
Note:
/
and do not end with /
except that the path is just "/"
.