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options.go
165 lines (135 loc) · 2.89 KB
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options.go
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package afs
import (
"io/fs"
"os"
)
////////////////////////////////////////////////////////////////////////////////
// Options ...
type Options struct {
// fill with fs.ModeXXX
Permission fs.FileMode
// fill with os.O_xxxx
Flag int
}
////////////////////////////////////////////////////////////////////////////////
// ToMakeDir ...
func ToMakeDir() *Options {
opt := new(Options)
opt.Permission = fs.ModePerm
opt.Flag = 0
return opt
}
// ToReadFile ...
func ToReadFile() *Options {
opt := new(Options)
opt.Permission = fs.ModePerm
opt.Flag = os.O_RDONLY
return opt
}
// ToWriteFile ...
func ToWriteFile() *Options {
opt := new(Options)
opt.Permission = fs.ModePerm
opt.Flag = os.O_WRONLY | os.O_TRUNC
return opt
}
// ToCreateFile ...
func ToCreateFile() *Options {
opt := new(Options)
opt.Permission = fs.ModePerm
opt.Flag = os.O_WRONLY | os.O_TRUNC | os.O_CREATE
return opt
}
////////////////////////////////////////////////////////////////////////////////
// OptionsBuilder 用于创建复合的 Options
type OptionsBuilder struct {
mkdirs bool
create bool
append bool
read bool
write bool
file bool
dir bool
fromBegin bool
resetLength bool // set length = 0
}
// Create ...
func (inst *OptionsBuilder) Create(value bool) *OptionsBuilder {
inst.create = value
return inst
}
// Read ...
func (inst *OptionsBuilder) Read(value bool) *OptionsBuilder {
inst.read = value
return inst
}
// Write ...
func (inst *OptionsBuilder) Write(value bool) *OptionsBuilder {
inst.write = value
return inst
}
// File ...
func (inst *OptionsBuilder) File(value bool) *OptionsBuilder {
inst.file = value
return inst
}
// Dir ...
func (inst *OptionsBuilder) Dir(value bool) *OptionsBuilder {
inst.dir = value
return inst
}
// Mkdirs ...
func (inst *OptionsBuilder) Mkdirs(value bool) *OptionsBuilder {
inst.mkdirs = value
return inst
}
// Append ...
func (inst *OptionsBuilder) Append(value bool) *OptionsBuilder {
inst.append = value
return inst
}
// FromBegin ...
func (inst *OptionsBuilder) FromBegin(value bool) *OptionsBuilder {
inst.fromBegin = value
return inst
}
// ResetLength ...
func (inst *OptionsBuilder) ResetLength(value bool) *OptionsBuilder {
inst.resetLength = value
return inst
}
// Options 创建 Options
func (inst *OptionsBuilder) Options() *Options {
f := 0
if inst.create {
f = f | os.O_CREATE
}
if inst.read {
if inst.write {
f = f | os.O_RDWR
} else {
f = f | os.O_RDONLY
}
} else {
if inst.write {
f = f | os.O_WRONLY
} else {
f = f | 0
}
}
if inst.resetLength {
f = f | os.O_TRUNC
}
if inst.append {
f = f | os.O_APPEND
}
opt := new(Options)
opt.Flag = f
opt.Permission = fs.ModePerm
return opt
}
////////////////////////////////////////////////////////////////////////////////
// Todo 新建一个 OptionsBuilder 对象
func Todo() *OptionsBuilder {
return new(OptionsBuilder)
}