Class XMLHandlerCache

  • public class XMLHandlerCache
    extends Object
    Singleton to help speed up lookups in an XML DOM tree.
    The theory is that you often loop over occurrences of a certain tag in a Node.
    If there are 20 occurrences, you go from index 0..19.
    Every time we do the following
    - found node 0
    - found node 0, 1
    - found node 0, 1, 2
    - ...
    So the time to search node index 19 is 20 times larger on average then index 0.

    We can solve this by caching the position of index 18 and by starting back at that position.

    This class is a singleton to keep everyting 100% compatible with the rest of the codebase.
    • Method Detail

      • storeCache

        public void storeCache​(XMLHandlerCacheEntry entry,
                               int lastChildNr)
        Store a cache entry
        entry - The cache entry to store
      • getLastChildNr

        public int getLastChildNr​(XMLHandlerCacheEntry entry)
        Retrieve the last child were we left off...
        entry - The cache entry to look for.
        the last child position or -1 if nothing was found.
      • getCacheHits

        public int getCacheHits()
        the number of cache hits for your statistical pleasure.
      • setCacheHits

        public void setCacheHits​(int cacheHits)
        Allows you to (re-)set the number of cache hits
        cacheHits - the number of cache hits.
      • clear

        public void clear()
        Clears the cache