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slicefile.go
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slicefile.go
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package files
import (
"errors"
"io"
)
// SliceFile implements File, and provides simple directory handling.
// It contains children files, and is created from a `[]File`.
// SliceFiles are always directories, and can't be read from or closed.
type SliceFile struct {
filename string
files []File
n int
}
func NewSliceFile(filename string, files []File) *SliceFile {
return &SliceFile{filename, files, 0}
}
func (f *SliceFile) IsDirectory() bool {
return true
}
func (f *SliceFile) NextFile() (File, error) {
if f.n >= len(f.files) {
return nil, io.EOF
}
file := f.files[f.n]
f.n++
return file, nil
}
func (f *SliceFile) FileName() string {
return f.filename
}
func (f *SliceFile) Read(p []byte) (int, error) {
return 0, ErrNotReader
}
func (f *SliceFile) Close() error {
return ErrNotReader
}
func (f *SliceFile) Peek(n int) File {
return f.files[n]
}
func (f *SliceFile) Length() int {
return len(f.files)
}
func (f *SliceFile) Size() (int64, error) {
var size int64
for _, file := range f.files {
sizeFile, ok := file.(SizeFile)
if !ok {
return 0, errors.New("Could not get size of child file")
}
s, err := sizeFile.Size()
if err != nil {
return 0, err
}
size += s
}
return size, nil
}