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package fs
import (
"bytes"
"errors"
"io"
"os"
"time"
)
type memfsBase struct {
parent *memfsDir
name string
exec bool
mtime time.Time
}
type memfsChild interface {
File
setName(string)
}
func (b memfsBase) Name() string { return b.name }
func (b *memfsBase) setName(n string) { b.name = n }
func (b memfsBase) Executable() bool { return b.exec }
func (b memfsBase) ModTime() time.Time { return b.mtime }
func (b memfsBase) Delete() error {
if b.parent == nil {
return errors.New("Root entry can not be deleted")
}
b.parent.deleteChild(b.name)
return nil
}
type memfsFile struct {
memfsBase
content *bytes.Buffer
}
func (memfsFile) Type() FileType { return FFile }
func (f memfsFile) Open() (io.ReadCloser, error) {
return f, nil
}
func (f memfsFile) OpenWritable() (io.WriteCloser, error) {
return f, nil
}
func (f memfsFile) Read(p []byte) (int, error) {
return f.content.Read(p)
}
func (f memfsFile) Write(p []byte) (int, error) {
return f.content.Write(p)
}
func (memfsFile) Close() error {
return nil
}
type memfsDir struct {
memfsBase
children map[string]memfsChild
}
func (memfsDir) Type() FileType { return FDir }
func (d memfsDir) Readdir() ([]File, error) {
l := make([]File, 0, len(d.children))
for _, f := range d.children {
l = append(l, f)
}
return l, nil
}
func (d memfsDir) GetChild(name string) (File, error) {
c, ok := d.children[name]
if !ok {
return nil, os.ErrNotExist
}
return c, nil
}
func (d memfsDir) createChildBase(name string, exec bool) memfsBase {
return memfsBase{
parent: &d,
name: name,
exec: exec,
mtime: time.Now(),
}
}
func (d memfsDir) CreateChildFile(name string, exec bool) (RegularFile, error) {
child := memfsFile{
memfsBase: d.createChildBase(name, exec),
content: new(bytes.Buffer),
}
d.children[name] = &child
return &child, nil
}
func (d memfsDir) CreateChildDir(name string) (Dir, error) {
child := memfsDir{
memfsBase: d.createChildBase(name, true),
children: make(map[string]memfsChild),
}
d.children[name] = &child
return &child, nil
}
func (d memfsDir) CreateChildSymlink(name string, target string) (Symlink, error) {
child := memfsSymlink{
memfsBase: d.createChildBase(name, false),
target: target,
}
d.children[name] = &child
return &child, nil
}
func (d *memfsDir) deleteChild(name string) {
delete(d.children, name)
}
func (d *memfsDir) RenameChild(oldname, newname string) error {
c, ok := d.children[oldname]
if !ok {
return os.ErrNotExist
}
c.setName(newname)
delete(d.children, oldname)
d.children[newname] = c
return nil
}
func NewMemoryFSRoot(name string) Dir {
return &memfsDir{
memfsBase: memfsBase{
parent: nil,
name: name,
exec: true,
mtime: time.Now(),
},
children: make(map[string]memfsChild),
}
}
type memfsSymlink struct {
memfsBase
target string
}
func (memfsSymlink) Type() FileType { return FSymlink }
func (s memfsSymlink) Readlink() (string, error) {
return s.target, nil
}
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