1 // Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
2 // All rights reserved.
4 // Use of this source code is governed by a BSD-style license that can be
5 // found in the LICENSE file.
10 "github.com/syndtr/goleveldb/leveldb/comparer"
13 type iComparer struct {
14 ucmp comparer.Comparer
17 func (icmp *iComparer) uName() string {
18 return icmp.ucmp.Name()
21 func (icmp *iComparer) uCompare(a, b []byte) int {
22 return icmp.ucmp.Compare(a, b)
25 func (icmp *iComparer) uSeparator(dst, a, b []byte) []byte {
26 return icmp.ucmp.Separator(dst, a, b)
29 func (icmp *iComparer) uSuccessor(dst, b []byte) []byte {
30 return icmp.ucmp.Successor(dst, b)
33 func (icmp *iComparer) Name() string {
37 func (icmp *iComparer) Compare(a, b []byte) int {
38 x := icmp.uCompare(internalKey(a).ukey(), internalKey(b).ukey())
40 if m, n := internalKey(a).num(), internalKey(b).num(); m > n {
49 func (icmp *iComparer) Separator(dst, a, b []byte) []byte {
50 ua, ub := internalKey(a).ukey(), internalKey(b).ukey()
51 dst = icmp.uSeparator(dst, ua, ub)
52 if dst != nil && len(dst) < len(ua) && icmp.uCompare(ua, dst) < 0 {
53 // Append earliest possible number.
54 return append(dst, keyMaxNumBytes...)
59 func (icmp *iComparer) Successor(dst, b []byte) []byte {
60 ub := internalKey(b).ukey()
61 dst = icmp.uSuccessor(dst, ub)
62 if dst != nil && len(dst) < len(ub) && icmp.uCompare(ub, dst) < 0 {
63 // Append earliest possible number.
64 return append(dst, keyMaxNumBytes...)