database: Update feature model

Remove source name/version fields
Add Type field to indicate if it's binary package or source package

database/models.go

@@ -155,18 +155,33 @@ type Namespace struct {
 	VersionFormat string
 }
 
+func NewNamespace(name string, versionFormat string) *Namespace {
+	return &Namespace{name, versionFormat}
+}
+
 // Feature represents a package detected in a layer but the namespace is not
 // determined.
 //
-// e.g. Name: Libssl1.0, Version: 1.0, Name: Openssl, Version: 1.0, VersionFormat: dpkg.
+// e.g. Name: Libssl1.0, Version: 1.0, VersionFormat: dpkg, Type: binary
 // dpkg is the version format of the installer package manager, which in this
 // case could be dpkg or apk.
 type Feature struct {
 	Name          string
 	Version       string
-	SourceName    string
-	SourceVersion string
 	VersionFormat string
+	Type          FeatureType
+}
+
+func NewFeature(name string, version string, versionFormat string, featureType FeatureType) *Feature {
+	return &Feature{name, version, versionFormat, featureType}
+}
+
+func NewBinaryPackage(name string, version string, versionFormat string) *Feature {
+	return &Feature{name, version, versionFormat, BinaryPackage}
+}
+
+func NewSourcePackage(name string, version string, versionFormat string) *Feature {
+	return &Feature{name, version, versionFormat, SourcePackage}
 }
 
 // NamespacedFeature is a feature with determined namespace and can be affected
@@ -179,6 +194,11 @@ type NamespacedFeature struct {
 	Namespace Namespace
 }
 
+func NewNamespacedFeature(namespace *Namespace, feature *Feature) *NamespacedFeature {
+	// TODO: namespaced feature should use pointer values
+	return &NamespacedFeature{*feature, *namespace}
+}
+
 // AffectedNamespacedFeature is a namespaced feature affected by the
 // vulnerabilities with fixed-in versions for this feature.
 type AffectedNamespacedFeature struct {