GUI -- Minor refactor of sample UI components (archetypes).

Change-Id: I80c8c699d9aff662bffd4c619f44e2079eddd1ce

@@ -39,6 +39,9 @@ import java.util.List;
 @Component(immediate = true)
 public class AppUiComponent {
 
+    private static final String VIEW_ID = "sampleCustom";
+    private static final String VIEW_TEXT = "Sample Custom";
+
     private final Logger log = LoggerFactory.getLogger(getClass());
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
@@ -46,7 +49,7 @@ public class AppUiComponent {
 
     // List of application views
     private final List<UiView> uiViews = ImmutableList.of(
-            new UiView(UiView.Category.OTHER, "sampleCustom", "Sample Custom")
+            new UiView(UiView.Category.OTHER, VIEW_ID, VIEW_TEXT)
     );
 
     // Factory for UI message handlers

@@ -39,6 +39,9 @@ import java.util.List;
 @Component(immediate = true)
 public class AppUiTableComponent {
 
+    private static final String VIEW_ID = "sampleTable";
+    private static final String VIEW_TEXT = "Sample Table";
+
     private final Logger log = LoggerFactory.getLogger(getClass());
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
@@ -46,7 +49,7 @@ public class AppUiTableComponent {
 
     // List of application views
     private final List<UiView> uiViews = ImmutableList.of(
-            new UiView(UiView.Category.OTHER, "sampleTable", "Sample Table")
+            new UiView(UiView.Category.OTHER, VIEW_ID, VIEW_TEXT)
     );
 
     // Factory for UI message handlers
@@ -58,7 +61,7 @@ public class AppUiTableComponent {
     // Application UI extension
     protected UiExtension extension =
             new UiExtension.Builder(getClass().getClassLoader(), uiViews)
-                    .resourcePath("sampleTable")
+                    .resourcePath(VIEW_ID)
                     .messageHandlerFactory(messageHandlerFactory)
                     .build();
 

@@ -42,6 +42,7 @@ import java.util.List;
 public class AppUiTopovComponent {
 
     private static final ClassLoader CL = AppUiTopovComponent.class.getClassLoader();
+    private static final String VIEW_ID = "sampleTopov";
 
     private final Logger log = LoggerFactory.getLogger(getClass());
 
@@ -50,7 +51,7 @@ public class AppUiTopovComponent {
 
     // List of application views
     private final List<UiView> uiViews = ImmutableList.of(
-            new UiViewHidden("sampleTopov")
+            new UiViewHidden(VIEW_ID)
     );
 
     // Factory for UI message handlers
@@ -68,7 +69,7 @@ public class AppUiTopovComponent {
     // Application UI extension
     protected UiExtension extension =
             new UiExtension.Builder(CL, uiViews)
-                    .resourcePath("sampleTopov")
+                    .resourcePath(VIEW_ID)
                     .messageHandlerFactory(messageHandlerFactory)
                     .topoOverlayFactory(topoOverlayFactory)
                     .build();