[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Tree Comparing Algorithm
Hi All, I am planning to write a XML Tree comparing XSLT using streaming. The XML Trees look something like this <root path="" mhash =" "> <folder path ="" mhash =""> <folder path ="" mhash =""> <leaf path ="" mhash =""> </leaf> </folder> </folder> </root> There will be two such XML files to compare . These two XMLs are generated before and after moving a folder from source to destination. Source and destination could be two different OS. This is essentially the serialized Merkle Tree output of a folder structure. The idea is to run a Merkle Tree comparator that will pick the nodes that did not match. Rules are as follows. 1. If the root node in both the tree matches, then there is not difference in the entire tree(because of how the Merkle tree is generated) 2. If root node hash does not match, we go to the child container and compare the hash of the child container in both the XML files. ( the XML folders structure will be identical with respect to the hash, but the folder path may be different because of the linux, windows path conventions. Otherwise the folder structure is meant to be the same.) 3. If the hash of a folder from both the trees are same, the entire tree under the folder that matches the hash is ignored. 4. if the hash of a folder from both the trees are not the same, then the tree is further traversed and the step 3 is repeated. 5. The XSLT keeps writing out the nodes that do not match the hashes in the source and target xml files So at the end of the processing, A comparator tree should be serialized, that has the nodes that have a non matching leaf node. Looking at the serialized tree, we can determine, which files got messed up while doing a transfer from Source to target. I am able to do this using non streaming xslt, but with streaming, since we need to stream two trees at a time and match compare the nodes, i am not very sure how to proceed. I am able to do manipulations on one XML with streaming. I tried a few tricks, but did not get anywhere ( I am not very comfortable copying my code scribbling here) I need streaming because the XML files may be big. If someone has done something similar, or point me to an intelligent way to do this, I will be thankful. Vasu
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|