Implement some parts for loading data from a directory

aliasdomain.go

@@ -0,0 +1,34 @@
+package mailfull
+
+// AliasDomain represents a AliasDomain.
+type AliasDomain struct {
+	name   string
+	target string
+}
+
+// NewAliasDomain creates a new AliasDomain instance.
+func NewAliasDomain(name, target string) (*AliasDomain, error) {
+	if !validAliasDomainName(name) {
+		return nil, ErrInvalidAliasDomainName
+	}
+	if !validAliasDomainTarget(target) {
+		return nil, ErrInvalidAliasDomainTarget
+	}
+
+	ad := &AliasDomain{
+		name:   name,
+		target: target,
+	}
+
+	return ad, nil
+}
+
+// Name returns name.
+func (ad *AliasDomain) Name() string {
+	return ad.name
+}
+
+// Target returns target.
+func (ad *AliasDomain) Target() string {
+	return ad.target
+}