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// Copyright (c) 2011 CZ.NIC z.s.p.o. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// blame: jnml, labs.nic.cz
package storage
import (
"os"
)
// FileAccessor is the concrete type returned by NewFile and OpenFile.
type FileAccessor struct {
*os.File
}
// Implementation of Accessor.
func (f *FileAccessor) BeginUpdate() error { return nil }
// Implementation of Accessor.
func (f *FileAccessor) EndUpdate() error { return nil }
// NewFile returns an Accessor backed by an os.File named name, It opens the
// named file with specified flag (os.O_RDWR etc.) and perm, (0666 etc.) if
// applicable. If successful, methods on the returned Accessor can be used for
// I/O. It returns the Accessor and an Error, if any.
//
// NOTE: The returned Accessor implements BeginUpdate and EndUpdate as a no op.
func NewFile(name string, flag int, perm os.FileMode) (store Accessor, err error) {
var f FileAccessor
if f.File, err = os.OpenFile(name, flag, perm); err == nil {
store = &f
}
return
}
// OpenFile returns an Accessor backed by an existing os.File named name, It
// opens the named file with specified flag (os.O_RDWR etc.) and perm, (0666
// etc.) if applicable. If successful, methods on the returned Accessor can be
// used for I/O. It returns the Accessor and an Error, if any.
//
// NOTE: The returned Accessor implements BeginUpdate and EndUpdate as a no op.
func OpenFile(name string, flag int, perm os.FileMode) (store Accessor, err error) {
var f FileAccessor
if f.File, err = os.OpenFile(name, flag, perm); err == nil {
store = &f
}
return
}
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