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comparator.go
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/
comparator.go
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// Copyright 2014, Shuhei Tanuma. All rights reserved.
// Use of this source code is governed by a MIT license
// that can be found in the LICENSE file.
package skiplist
import (
"bytes"
)
type IntComparator struct {
}
func (self *IntComparator) Compare(a, b interface{}) int {
if ax, ok := a.(int); ok {
if bx, ok := b.(int); ok {
if ax == bx {
return 0
}
if ax < bx {
return -1
} else {
return 1
}
}
}
return -1
}
type BytesComparator struct {
}
func (self *BytesComparator) Compare(a, b interface{}) int {
if ax, ok := a.([]byte); ok {
if bx, ok := b.([]byte); ok {
return bytes.Compare(ax, bx)
}
}
return -1
}
type StringComparator struct {
}
func (self *StringComparator) Compare(a, b interface{}) int {
if ax, ok := a.(string); ok {
if bx, ok := b.(string); ok {
if ax == bx {
return 0
}
if ax < bx {
return -1
} else {
return 1
}
}
}
return -1
}