// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com> // All rights reserved. // // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. package leveldb import ( "github.com/syndtr/goleveldb/leveldb/comparer" ) type iComparer struct { ucmp comparer.Comparer } func (icmp *iComparer) uName() string { return icmp.ucmp.Name() } func (icmp *iComparer) uCompare(a, b []byte) int { return icmp.ucmp.Compare(a, b) } func (icmp *iComparer) uSeparator(dst, a, b []byte) []byte { return icmp.ucmp.Separator(dst, a, b) } func (icmp *iComparer) uSuccessor(dst, b []byte) []byte { return icmp.ucmp.Successor(dst, b) } func (icmp *iComparer) Name() string { return icmp.uName() } func (icmp *iComparer) Compare(a, b []byte) int { x := icmp.uCompare(internalKey(a).ukey(), internalKey(b).ukey()) if x == 0 { if m, n := internalKey(a).num(), internalKey(b).num(); m > n { return -1 } else if m < n { return 1 } } return x } func (icmp *iComparer) Separator(dst, a, b []byte) []byte { ua, ub := internalKey(a).ukey(), internalKey(b).ukey() dst = icmp.uSeparator(dst, ua, ub) if dst != nil && len(dst) < len(ua) && icmp.uCompare(ua, dst) < 0 { // Append earliest possible number. return append(dst, keyMaxNumBytes...) } return nil } func (icmp *iComparer) Successor(dst, b []byte) []byte { ub := internalKey(b).ukey() dst = icmp.uSuccessor(dst, ub) if dst != nil && len(dst) < len(ub) && icmp.uCompare(ub, dst) < 0 { // Append earliest possible number. return append(dst, keyMaxNumBytes...) } return nil }