add object package (#22)

internal/object/info.go

@@ -0,0 +1,35 @@
+package object
+
+import (
+	"fmt"
+	"strings"
+)
+
+type MusicOrientationInfo struct {
+	Genres       []string
+	Danceability float64
+	Valence      float64
+	Popularity   int
+}
+
+func NewMusicOrientationInfo() *MusicOrientationInfo {
+	return &MusicOrientationInfo{
+		Genres:       []string{},
+		Danceability: 0.0,
+		Valence:      0.0,
+		Popularity:   0,
+	}
+}
+
+func (i *MusicOrientationInfo) String() string {
+	var output string
+	output += fmt.Sprintf("genres: %s\n", strings.Join(i.Genres, ","))
+	output += fmt.Sprintf("danceability: %f\n", i.Danceability)
+	output += fmt.Sprintf("valence: %f\n", i.Valence)
+	output += fmt.Sprintf("popularity: %d\n", i.Popularity)
+	return output
+}
+
+func (i *MusicOrientationInfo) IsSet() bool {
+	return len(i.Genres) != 0 && i.Danceability != 0.0 && i.Valence != 0.0 && i.Popularity != 0
+}