Add NoWhitespaceBeforeCaseDefaultColon

commit-id:3265f01a

builder/src/main/resources/application.yml

@@ -1538,3 +1538,10 @@ rules:
         enabled: true
         source: SEVNTU
         uri: http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/coding/MoveVariableInsideIfCheck.html
+    -
+        name: NoWhitespaceBeforeCaseDefaultColon
+        parent: TREEWALKER
+        level: LAYOUT
+        enabled: true
+        source: CHECKSTYLE
+        uri: https://checkstyle.sourceforge.io/config_whitespace.html#NoWhitespaceBeforeCaseDefaultColon

builder/src/main/resources/rules/NoWhitespaceBeforeCaseDefaultColon.md

@@ -0,0 +1,29 @@
+
+Checks that there is no whitespace before the colon in a switch block. .
+
+Valid:
+````
+switch(1) {
+    case 1:
+        break;
+    case 2:
+        break;
+    default:
+        break;
+}
+````
+
+Invalid:
+````
+switch(2) {
+    case 2: // ok
+        break;
+    case 3, 4
+             : break; // violation, whitespace before ':' is not allowed here
+    case 4,
+          5: break; // ok
+    default
+          : // violation, whitespace before ':' is not allowed here
+        break;
+}
+````