Added Delete methods for slice elements to common attributes, entry, feed, person and source

source.go

@@ -28,7 +28,7 @@ func NewSource() *Source {
 	return &Source{CommonAttributes: newCommonAttributes()}
 }
 
-// AddAuthor adds the Person as an author to the Entry.
+// AddAuthor adds the Person as an author to the Source.
 func (s *Source) AddAuthor(p *Person) {
 	if s.Authors == nil {
 		s.Authors = make([]*Person, 1)
@@ -38,7 +38,18 @@ func (s *Source) AddAuthor(p *Person) {
 	}
 }
 
-// AddCategory adds the Category to the Entry.
+// DeleteAuthor deletes the Person from the Source. It return an error.
+func (s *Source) DeleteAuthor(id int) error {
+	length := len(s.Authors)
+	if id > length {
+		return fmt.Errorf("error deleting author from source %v: id %v out of range %v", s, id, length)
+	}
+
+	s.Authors = append(s.Authors[:id], s.Authors[id+1:]...)
+	return nil
+}
+
+// AddCategory adds the Category to the Source.
 func (s *Source) AddCategory(c *Category) {
 	if s.Categories == nil {
 		s.Categories = make([]*Category, 1)
@@ -48,7 +59,18 @@ func (s *Source) AddCategory(c *Category) {
 	}
 }
 
-// AddContributor adds the Person as a contributor to the Entry.
+// DeleteCategory deletes the Category from the Source. It return an error.
+func (s *Source) DeleteCategory(id int) error {
+	length := len(s.Categories)
+	if id > length {
+		return fmt.Errorf("error deleting category from source %v: id %v out of range %v", s, id, length)
+	}
+
+	s.Categories = append(s.Categories[:id], s.Categories[id+1:]...)
+	return nil
+}
+
+// AddContributor adds the Person as a contributor to the Source.
 func (s *Source) AddContributor(c *Person) {
 	if s.Contributors == nil {
 		s.Contributors = make([]*Person, 1)
@@ -58,7 +80,18 @@ func (s *Source) AddContributor(c *Person) {
 	}
 }
 
-// AddLink adds the Link to the Entry.
+// DeleteContributor deletes the Person from the Source. It return an error.
+func (s *Source) DeleteContributor(id int) error {
+	length := len(s.Contributors)
+	if id > length {
+		return fmt.Errorf("error deleting contributor from source %v: id %v out of range %v", s, id, length)
+	}
+
+	s.Contributors = append(s.Contributors[:id], s.Contributors[id+1:]...)
+	return nil
+}
+
+// AddLink adds the Link to the Source.
 func (s *Source) AddLink(l *Link) {
 	if s.Links == nil {
 		s.Links = make([]*Link, 1)
@@ -68,7 +101,18 @@ func (s *Source) AddLink(l *Link) {
 	}
 }
 
-// AddExtension adds the ExtensionElement to the Entry.
+// DeleteLink deletes the Link from the Source. It return an error.
+func (s *Source) DeleteLink(id int) error {
+	length := len(s.Links)
+	if id > length {
+		return fmt.Errorf("error deleting link from source %v: id %v out of range %v", s, id, length)
+	}
+
+	s.Links = append(s.Links[:id], s.Links[id+1:]...)
+	return nil
+}
+
+// AddExtension adds the ExtensionElement to the Source.
 func (s *Source) AddExtension(e *ExtensionElement) {
 	if s.Extensions == nil {
 		s.Extensions = make([]*ExtensionElement, 1)
@@ -78,6 +122,17 @@ func (s *Source) AddExtension(e *ExtensionElement) {
 	}
 }
 
+// DeleteExtension deletes the Extension from the Source. It return an error.
+func (s *Source) DeleteExtension(id int) error {
+	length := len(s.Extensions)
+	if id > length {
+		return fmt.Errorf("error deleting extension from source %v: id %v out of range %v", s, id, length)
+	}
+
+	s.Extensions = append(s.Extensions[:id], s.Extensions[id+1:]...)
+	return nil
+}
+
 // Check checks the Source for incompatibilities with RFC4287. It returns an
 // error.
 func (s *Source) Check() error {