Solved

How to traverse a tree(input) and build another tree based on the certain condition?

Posted on 2016-09-23
2
40 Views
Last Modified: 2016-10-02
If the file system is the input tree, what I would like to do is to start from one folder, and scan each file within this folder and use the file name to search another place in the file system using some conditions like: filename = foldername, for each foldetname returned in this search, add this foldetname as a child to the output tree and search again until not more match.


So the input is a tree and output is also a tree. Recursion is what I think is required to solved the problem and hopefully someone can share ideas or examples or links , really appreciate!
0
Comment
Question by:Steven Ni
2 Comments
 
LVL 26

Accepted Solution

by:
dpearson earned 500 total points
ID: 41818530
Maybe you're looking for a structure like this (in pseudo-code):

Tree scan(File folder) {
   Tree result = new Tree() ;
   List<File> files = folder.list() ;   // This is where you "scan the input tree"
   for (File file : files) {
      if (condition(file)) {
          Tree subtree = scan(file) ;
           result.add(subtree) ;   // Need to insert this in the correct part of the tree
      }
   }
   return tree ;
}

Open in new window


If you have no way to retrieve a list of files inside a folder from a folder object, then you'd also want to pass in the input tree.  So it would be:

Tree scan(File folder, Tree input) {
}

and you just pass the input tree around as well.

Any help?

Doug
0
 

Author Closing Comment

by:Steven Ni
ID: 41825245
Thanks for the solution and sorry for the late reply as was on vacation.
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Non-recursive backtracking, using a stack 1 127
Odds of picking games correctly 4 89
Path to Python 9 118
Advice in Xamarin 21 78
This is about my first experience with programming Arduino.
"Disruption" is the most feared word for C-level executives these days. They agonize over their industry being disturbed by another player - most likely by startups.
An introduction to basic programming syntax in Java by creating a simple program. Viewers can follow the tutorial as they create their first class in Java. Definitions and explanations about each element are given to help prepare viewers for future …
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question