Add Generator interface

generator.go

@@ -0,0 +1,21 @@
+package uuid
+
+type Generator interface {
+	NewV1() UUID
+	NewV2(domaing byte) UUID
+	NewV3(ns UUID, name string) UUID
+	NewV4() UUID
+	NewV5(ns UUID, name string) UUID
+}
+
+type standard struct{}
+
+func (_ standard) NewV1() UUID                     { return NewV1() }
+func (_ standard) NewV2(domain byte) UUID          { return NewV2(domain) }
+func (_ standard) NewV3(ns UUID, name string) UUID { return NewV3(ns, name) }
+func (_ standard) NewV4() UUID                     { return NewV4() }
+func (_ standard) NewV5(ns UUID, name string) UUID { return NewV5(ns, name) }
+
+func NewGenerator() Generator {
+	return standard{}
+}

generator_test.go

@@ -0,0 +1,39 @@
+package uuid
+
+import (
+	"testing"
+)
+
+func TestNewGenerator(t *testing.T) {
+	generator := NewGenerator()
+
+	u1 := generator.NewV1()
+	if u1.Version() != 1 {
+		t.Errorf("UUIDv1 generated with incorrect version: %d", u1.Version())
+	}
+
+	u2 := generator.NewV2(DomainPerson)
+
+	if u2.Version() != 2 {
+		t.Errorf("UUIDv2 generated with incorrect version: %d", u2.Version())
+	}
+
+	u3 := generator.NewV3(NamespaceDNS, "www.example.com")
+
+	if u3.Version() != 3 {
+		t.Errorf("UUIDv3 generated with incorrect version: %d", u3.Version())
+	}
+
+	u4 := generator.NewV4()
+
+	if u4.Version() != 4 {
+		t.Errorf("UUIDv4 generated with incorrect version: %d", u4.Version())
+	}
+
+	u5 := generator.NewV5(NamespaceDNS, "www.example.com")
+
+	if u5.Version() != 5 {
+		t.Errorf("UUIDv3 generated with incorrect version: %d", u5.Version())
+	}
+
+}