Esempio n. 1
0
// deleteRecursive is used by the delete logic.  The recursion depth
// only goes as far as the number of dimensions, so this shouldn't be an
// issue.
func (rt *skipListRT) deleteRecursive(sl *skip.SkipList, dimension uint64,
	entry rangetree.Entry) rangetree.Entry {

	value := entry.ValueAtDimension(dimension)
	if isLastDimension(dimension, rt.dimensions) {
		entries := sl.Delete(skipEntry(value))
		if entries[0] == nil {
			return nil
		}

		rt.number--
		return entries[0].(*lastBundle).entry
	}

	db, ok := sl.Get(skipEntry(value))[0].(*dimensionalBundle)
	if !ok { // value was not found
		return nil
	}

	result := rt.deleteRecursive(db.sl, dimension+1, entry)
	if result == nil {
		return nil
	}

	if db.sl.Len() == 0 {
		sl.Delete(db)
	}

	return result
}
Esempio n. 2
0
func (rt *skipListRT) get(entry rangetree.Entry) rangetree.Entry {
	var (
		sl    = rt.top
		e     common.Comparator
		value uint64
	)
	for i := uint64(0); i < rt.dimensions; i++ {
		value = uint64(entry.ValueAtDimension(i))
		e = sl.Get(skipEntry(value))[0]
		if e == nil {
			return nil
		}

		if isLastDimension(i, rt.dimensions) {
			return e.(*lastBundle).entry
		}

		sl = e.(*dimensionalBundle).sl
	}

	panic(`Reached past for loop without finding last dimension.`)
}
Esempio n. 3
0
func (rt *skipListRT) add(entry rangetree.Entry) rangetree.Entry {
	var (
		value int64
		e     common.Comparator
		sl    = rt.top
		db    *dimensionalBundle
		lb    *lastBundle
	)

	for i := uint64(0); i < rt.dimensions; i++ {
		value = entry.ValueAtDimension(i)
		e = sl.Get(skipEntry(value))[0]
		if isLastDimension(i, rt.dimensions) {
			if e != nil { // this is an overwrite
				lb = e.(*lastBundle)
				oldEntry := lb.entry
				lb.entry = entry
				return oldEntry
			}

			// need to add new sl entry
			lb = &lastBundle{id: uint64(value), entry: entry}
			rt.number++
			sl.Insert(lb)
			return nil
		}

		if e == nil { // we need the intermediate dimension
			db = &dimensionalBundle{id: uint64(value), sl: skip.New(uint64(0))}
			sl.Insert(db)
		} else {
			db = e.(*dimensionalBundle)
		}

		sl = db.sl
	}

	panic(`Ran out of dimensions before for loop completed.`)
}