From b312beddc11b0aa27ab88c58a258c7de12ce0795 Mon Sep 17 00:00:00 2001
From: Michael Yang <mikkyangg@gmail.com>
Date: Tue, 31 Dec 2013 13:41:41 -0500
Subject: [PATCH] Add text framer interface

---
 frame.go | 9 +++++++++
 id3v2.go | 8 +++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/frame.go b/frame.go
index be7c0d7..18576ef 100644
--- a/frame.go
+++ b/frame.go
@@ -84,6 +84,15 @@ func (f DataFrame) Bytes() []byte {
 	return f.data
 }
 
+// TextFramer represents frames that contain encoded text
+type TextFramer interface {
+	Framer
+	Encoding() string
+	SetEncoding(string) error
+	Text() string
+	SetText(string) error
+}
+
 // TextFrame represents frames that contain encoded text
 type TextFrame struct {
 	FrameHead
diff --git a/id3v2.go b/id3v2.go
index 9fa7219..dbdbce3 100644
--- a/id3v2.go
+++ b/id3v2.go
@@ -197,12 +197,10 @@ func (t *Tag) SetGenre(text string) {
 	t.setTextFrameText(t.commonMap["Genre"], text)
 }
 
-func (t *Tag) textFrame(id string) *TextFrame {
+func (t *Tag) textFrame(id string) TextFramer {
 	if frame := t.Frame(id); frame != nil {
-		switch frame.(type) {
-		case (*TextFrame):
-			return frame.(*TextFrame)
-		default:
+		if textFramer, ok := frame.(TextFramer); ok {
+			return textFramer
 		}
 	}