Generalize updating entry and feed with update method

entry.go

@@ -57,6 +57,15 @@ func (e *Entry) checkAuthors(authorInFeed bool) error {
 }
 
 // NewEntry creates a new Entry. It returns a *Entry.
+// update sets the Updated time to time.Now.
+func (e *Entry) update() {
+	if e.Updated == nil {
+		e.Updated = NewDate(time.Now())
+	} else {
+		e.Updated.DateTime = DateTime(time.Now())
+	}
+}
+
 func NewEntry(title string) *Entry {
 	return &Entry{
 		CommonAttributes: NewCommonAttributes(),
@@ -69,13 +78,8 @@ func NewEntry(title string) *Entry {
 // AddAuthor adds the Person as an author to the Entry. It returns its index as
 // an int.
 func (e *Entry) AddAuthor(p *Person) int {
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
 	return addToSlice(&e.Authors, p)
+	e.update()
 }
 
 // DeleteAuthor deletes the Person at index from the Entry. It return an error.
@@ -84,23 +88,13 @@ func (e *Entry) DeleteAuthor(index int) error {
 		return fmt.Errorf("error deleting author %v from entry %v: %v", index, e.ID.URI, err)
 	}
 
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return nil
 }
 
 // AddCategory adds the Category to the Entry. It returns ts index as an int.
 func (e *Entry) AddCategory(c *Category) int {
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return addToSlice(&e.Categories, c)
 }
 
@@ -111,24 +105,14 @@ func (e *Entry) DeleteCategory(index int) error {
 		return fmt.Errorf("error deleting category %v from entry %v: %v", index, e.ID.URI, err)
 	}
 
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return nil
 }
 
 // AddContributor adds the Person as a contributor to the Entry. It returns its
 // index as an int.
 func (e *Entry) AddContributor(c *Person) int {
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return addToSlice(&e.Contributors, c)
 }
 
@@ -139,23 +123,13 @@ func (e *Entry) DeleteContributor(index int) error {
 		return fmt.Errorf("error deleting contributor %v from entry %v: %v", index, e.ID.URI, err)
 	}
 
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return nil
 }
 
 // AddLink adds the Link to the Entry. It returns its index as an int.
 func (e *Entry) AddLink(l *Link) int {
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return addToSlice(&e.Links, l)
 }
 
@@ -165,24 +139,14 @@ func (e *Entry) DeleteLink(index int) error {
 		return fmt.Errorf("error deleting link %v from entry %v: %v", index, e.ID.URI, err)
 	}
 
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return nil
 }
 
 // AddExtension adds the ExtensionElement to the Entry. It returns its index as
 // an int.
 func (e *Entry) AddExtension(x *ExtensionElement) int {
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return addToSlice(&e.Extensions, x)
 }
 
@@ -193,12 +157,7 @@ func (e *Entry) DeleteExtension(index int) error {
 		return fmt.Errorf("error deleting extension %v from entry %v: %v", index, e.ID.URI, err)
 	}
 
-	if e.Updated == nil {
-		e.Updated = NewDate(time.Now())
-	} else {
-		e.Updated.DateTime = DateTime(time.Now())
-	}
-
+	e.update()
 	return nil
 }