func (n *MemPrefixNode) insert(z *cf.Zp, marray []*cf.Zp, bs *cf.Bitstring, depth int) error {
n.updateSvalues(z, marray)
n.numElements++
if n.IsLeaf() {
if len(n.elements) > n.SplitThreshold() {
err := n.split(depth)
if err != nil {
return err
}
} else {
for _, nz := range n.elements {
if nz.Cmp(z) == 0 {
return fmt.Errorf("duplicate: %q", z.String())
}
}
n.elements = append(n.elements, z)
return nil
}
}
childIndex := NextChild(n, bs, depth)
children, err := n.Children()
if err != nil {
return err
}
child := children[childIndex].(*MemPrefixNode)
return child.insert(z, marray, bs, depth+1)
}
func WriteZp(w io.Writer, z *cf.Zp) (err error) {
num := z.Bytes()
_, err = w.Write(num)
if err != nil {
return
}
if len(num) < SksZpNbytes {
pad := make([]byte, SksZpNbytes-len(num))
_, err = w.Write(pad)
}
return
}
// Insert a Z/Zp integer into the prefix tree
func (t *MemPrefixTree) Insert(z *cf.Zp) error {
if t.allElements.Has(z) {
return fmt.Errorf("duplicate: %q", z.String())
}
bs := cf.NewZpBitstring(z)
marray, err := AddElementArray(t, z)
if err != nil {
return err
}
err = t.root.insert(z, marray, bs, 0)
if err != nil {
return err
}
t.allElements.Add(z)
return nil
}
func (t *prefixTree) Remove(z *cf.Zp) error {
_, lookupErr := t.db.Get(z.Bytes(), nil)
if lookupErr != nil {
return lookupErr
}
bs := cf.NewZpBitstring(z)
root, err := t.Root()
if err != nil {
return err
}
marray := recon.DelElementArray(t, z)
err = root.(*prefixNode).remove(z, marray, bs, 0)
if err != nil {
return err
}
return t.db.Delete(z.Bytes(), nil)
}
func (n *prefixNode) deleteElement(element *cf.Zp) error {
elementBytes := element.Bytes()
var elements [][]byte
var removed bool
for _, element := range n.NodeElements {
if bytes.Equal(element, elementBytes) {
removed = true
} else {
elements = append(elements, element)
}
}
if !removed {
return ErrElementNotFound(element)
}
n.NodeElements = elements
return n.upsertNode()
}
func (t *prefixTree) Insert(z *cf.Zp) error {
_, lookupErr := t.db.Get(z.Bytes(), nil)
if lookupErr == nil {
return ErrDuplicateElement(z)
} else if lookupErr != leveldb.ErrNotFound {
return lookupErr
}
bs := cf.NewZpBitstring(z)
root, err := t.Root()
if err != nil {
return err
}
marray, err := recon.AddElementArray(t, z)
if err != nil {
return err
}
err = root.(*prefixNode).insert(z, marray, bs, 0)
if err != nil {
return err
}
return t.db.Put(z.Bytes(), []byte{}, nil)
}
func (n *prefixNode) insertElement(element *cf.Zp) error {
n.NodeElements = append(n.NodeElements, element.Bytes())
return n.upsertNode()
}