up3

server/item/written_book_generation.go

@@ -0,0 +1,41 @@
+package item
+
+// WrittenBookGeneration represents a WrittenBook generation.
+type WrittenBookGeneration struct {
+	generation
+}
+
+type generation uint8
+
+// OriginalGeneration is the original WrittenBook.
+func OriginalGeneration() WrittenBookGeneration {
+	return WrittenBookGeneration{0}
+}
+
+// CopyGeneration is a copy of the original WrittenBook.
+func CopyGeneration() WrittenBookGeneration {
+	return WrittenBookGeneration{1}
+}
+
+// CopyOfCopyGeneration is a copy of a copy of the original WrittenBook.
+func CopyOfCopyGeneration() WrittenBookGeneration {
+	return WrittenBookGeneration{2}
+}
+
+// Uint8 returns the generation as a uint8.
+func (g generation) Uint8() uint8 {
+	return uint8(g)
+}
+
+// String ...
+func (g generation) String() string {
+	switch g {
+	case 0:
+		return "original"
+	case 1:
+		return "copy of original"
+	case 2:
+		return "copy of copy"
+	}
+	panic("unknown written book generation")
+}