add private constructor

Author: Thibault Falque

src/main/java/fr/univartois/sonargo/coverage/FactoryLine.java

@@ -3,6 +3,10 @@
 public class FactoryLine {
     private static int line = 1;
 
+    private FactoryLine() {
+	throw new IllegalStateException("Utility class");
+    }
+
     public static void init() {
 	line = 1;
     }

src/main/java/fr/univartois/sonargo/coverage/LinePredicate.java

@@ -5,6 +5,10 @@ public class LinePredicate {
     private static boolean commentFound = false;
     private static boolean typeFound = false;
 
+    private LinePredicate() {
+	throw new IllegalStateException("Utility class");
+    }
+
     public static void init() {
 	funcFound = false;
 	commentFound = false;