-
Notifications
You must be signed in to change notification settings - Fork 2
/
api_sorter.go
41 lines (34 loc) · 1.24 KB
/
api_sorter.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package main
import (
"sort"
)
// By is the type of a "less" function that defines the ordering of its Objects arguments.
type By func(o1, o2 *Object) bool
// Sort is a method on the function type, By, that sorts the argument slice according to the function.
func (by By) Sort(objects []*Object) {
os := &objectSorter{
objects: objects,
by: by, // The Sort method's receiver is the function (closure) that defines the sort order.
}
sort.Sort(os)
}
// objectSorter joins a By function and a slice of Objects to be sorted.
type objectSorter struct {
objects []*Object
by func(o1, o2 *Object) bool // Closure used in the Less method.
}
// Len is part of sort.Interface.
func (o *objectSorter) Len() int {
return len(o.objects)
}
// Swap is part of sort.Interface.
func (o *objectSorter) Swap(i, j int) {
o.objects[i], o.objects[j] = o.objects[j], o.objects[i]
}
// Less is part of sort.Interface. It is implemented by calling the "by" closure in the sorter.
func (o *objectSorter) Less(i, j int) bool {
return o.by(o.objects[i], o.objects[j])
}