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package driver
import "time"
// FileInfo returns information about a given path. Inspired by os.FileInfo,
// it elides the base name method for a full path instead.
type FileInfo interface {
// Path provides the full path of the target of this file info.
Path() string
// Size returns current length in bytes of the file. The return value can
// be used to write to the end of the file at path. The value is
// meaningless if IsDir returns true.
Size() int64
// ModTime returns the modification time for the file. For backends that
// don't have a modification time, the creation time should be returned.
ModTime() time.Time
// IsDir returns true if the path is a directory.
IsDir() bool
}
// NOTE(stevvooe): The next two types, FileInfoFields and FileInfoInternal
// should only be used by storagedriver implementations. They should moved to
// a "driver" package, similar to database/sql.
// FileInfoFields provides the exported fields for implementing FileInfo
// interface in storagedriver implementations. It should be used with
// InternalFileInfo.
type FileInfoFields struct {
// Path provides the full path of the target of this file info.
Path string
// Size is current length in bytes of the file. The value of this field
// can be used to write to the end of the file at path. The value is
// meaningless if IsDir is set to true.
Size int64
// ModTime returns the modification time for the file. For backends that
// don't have a modification time, the creation time should be returned.
ModTime time.Time
// IsDir returns true if the path is a directory.
IsDir bool
}
// FileInfoInternal implements the FileInfo interface. This should only be
// used by storagedriver implementations that don't have a specialized
// FileInfo type.
type FileInfoInternal struct {
FileInfoFields
}
var _ FileInfo = FileInfoInternal{}
var _ FileInfo = &FileInfoInternal{}
// Path provides the full path of the target of this file info.
func (fi FileInfoInternal) Path() string {
return fi.FileInfoFields.Path
}
// Size returns current length in bytes of the file. The return value can
// be used to write to the end of the file at path. The value is
// meaningless if IsDir returns true.
func (fi FileInfoInternal) Size() int64 {
return fi.FileInfoFields.Size
}
// ModTime returns the modification time for the file. For backends that
// don't have a modification time, the creation time should be returned.
func (fi FileInfoInternal) ModTime() time.Time {
return fi.FileInfoFields.ModTime
}
// IsDir returns true if the path is a directory.
func (fi FileInfoInternal) IsDir() bool {
return fi.FileInfoFields.IsDir
}
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