Move developer documentation to doc/Development

[squirrelmail.git] / doc / tree.txt

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-So what is this tree stuff?
-===========================
-
-In order to get correct folder deletion across the board for all
-different RFC2060 compliant IMAP servers, deleting of folders 
-needed to work by deleting subfolders (inferiors) first, working
-up to the top folder that is desired to be deleted.
-
-The best way to do this was to use a tree, and walk the thing in
-preorder to get subfolders first (leaves), working our way up the 
-tree.  I chose to use an array for the tree structure.
-
-The array has the following elements:
-$tree[0]["value"]             = <full folder name>
-$tree[0]["doIHaveChildren"]   = boolean
-$tree[0]["subNodes"]          = indexes of the array that are
-                                  child nodes of this node
-
-The trickiest part was finding the correct parent node when creating
-a new node in the tree.  Check the documentation in the code for
-more info on this.
-
-Basically all we had to do was loop through each of the items that
-need to be in the tree (folders, subfolders), find their parent,
-let their parent know it has a new child, and insert the values
-into the child.
-
-Once the tree is generated, a simple preorder or postorder walk
-of the tree can be done doing whatever function you desire (delete,
-create, etc).
-
-Preorder walking gives you the tree from the leaves up.  Postorder
-walks the tree from the root node down to the leaves.