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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package db
import (
"code.gitea.io/gitea/modules/setting"
"xorm.io/xorm"
)
// Paginator is the base for different ListOptions types
type Paginator interface {
GetSkipTake() (skip, take int)
GetStartEnd() (start, end int)
}
// GetPaginatedSession creates a paginated database session
func GetPaginatedSession(p Paginator) *xorm.Session {
skip, take := p.GetSkipTake()
return x.Limit(take, skip)
}
// SetSessionPagination sets pagination for a database session
func SetSessionPagination(sess Engine, p Paginator) *xorm.Session {
skip, take := p.GetSkipTake()
return sess.Limit(take, skip)
}
// SetEnginePagination sets pagination for a database engine
func SetEnginePagination(e Engine, p Paginator) Engine {
skip, take := p.GetSkipTake()
return e.Limit(take, skip)
}
// ListOptions options to paginate results
type ListOptions struct {
PageSize int
Page int // start from 1
}
// GetSkipTake returns the skip and take values
func (opts *ListOptions) GetSkipTake() (skip, take int) {
opts.SetDefaultValues()
return (opts.Page - 1) * opts.PageSize, opts.PageSize
}
// GetStartEnd returns the start and end of the ListOptions
func (opts *ListOptions) GetStartEnd() (start, end int) {
start, take := opts.GetSkipTake()
end = start + take
return
}
// SetDefaultValues sets default values
func (opts *ListOptions) SetDefaultValues() {
if opts.PageSize <= 0 {
opts.PageSize = setting.API.DefaultPagingNum
}
if opts.PageSize > setting.API.MaxResponseItems {
opts.PageSize = setting.API.MaxResponseItems
}
if opts.Page <= 0 {
opts.Page = 1
}
}
// AbsoluteListOptions absolute options to paginate results
type AbsoluteListOptions struct {
skip int
take int
}
// NewAbsoluteListOptions creates a list option with applied limits
func NewAbsoluteListOptions(skip, take int) *AbsoluteListOptions {
if skip < 0 {
skip = 0
}
if take <= 0 {
take = setting.API.DefaultPagingNum
}
if take > setting.API.MaxResponseItems {
take = setting.API.MaxResponseItems
}
return &AbsoluteListOptions{skip, take}
}
// GetSkipTake returns the skip and take values
func (opts *AbsoluteListOptions) GetSkipTake() (skip, take int) {
return opts.skip, opts.take
}
// GetStartEnd returns the start and end values
func (opts *AbsoluteListOptions) GetStartEnd() (start, end int) {
return opts.skip, opts.skip + opts.take
}
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