Thread: undo delete method

So I have a method to delete a file from my file system but I wanted to write another method that could restore the previously deleted file. the only problem is I don't know how I would start writing it. My code for the delete the file is:

public int unlink( String name )
    {
        for(int i = 0; i < C.DIR_ENTRIES; i++)
        {
            Directory de = readEntryDir(i);
 
            if (de.getName().equals(name))
            {
                de.setName("");
                writeEntryDir(i,de);
 
                int curBlock = de.getStart();
                int nextBlock = 0;
                while(readEntryFAT(curBlock) != C.END)
                {
                    nextBlock = readEntryFAT(curBlock);
                    writeEntryFAT(curBlock, C.FREE);
                    curBlock = nextBlock;
                }
                writeEntryFAT(curBlock, C.FREE);
            }
        }
        return C.OK;
    }

Any help would be appreciated

method that could restore the previously deleted file.

How are you going to "delete" a file so that it can be restored? If you let the OS do it, the file could be gone.

What classes are you using in the posted code? What packages does it import?

Its an API file system,

What is an "API file system"?
What options are in the API for that package's classes?

It is a big set of code we were given as part of our coursework. Its basically made up of Blocks which can linked together for the file system. I just couldn't think of how I could link up a previously link block.

How could anyone that does not have access to the data structure you are working with and the API you have for manipulating it, have any ideas on how to solve your problem?
You need to study the data structure for the file system and classes and methods for working with it for ideas.

Well I was thinking that method would would be kind of similar to the deleting method only backwards and i'm assuming quite abit more coding

I would think that undelete would restore the directory and chain of blocks containing the file's data to the way they were before the delete. If you can find all the pieces you could put them back together the way they were before the delete.