Optimize generated class DOT

report/src/main/java/org/hjug/refactorfirst/report/HtmlReport.java

@@ -594,6 +594,11 @@ String buildClassGraphDot(
         return toJavaScriptTemplateLiteral(buildRawClassGraphDot(classGraph, repoUrl, codebaseGraphDTO));
     }
 
+    /**
+     * Appends class DOT nodes, omitting sink-only anonymous or synthetic vertices and labels that
+     * match their node IDs. Includes source-link attributes supplied by the report and highlights
+     * classes selected for removal.
+     */
     private void renderClassVertices(
             Graph<String, DefaultWeightedEdge> classGraph,
             String repoUrl,
@@ -609,19 +614,23 @@ private void renderClassVertices(
                 continue;
             }
 
-            dot.append(renderSafeNodeId(vertex, classGraph, codebaseGraphDTO));
+            String safeNodeId = renderSafeNodeId(vertex, classGraph, codebaseGraphDTO);
+            dot.append(safeNodeId);
 
             dot.append(" [");
             dot.append(hyperlinkClassForDot(vertex, repoUrl, codebaseGraphDTO));
 
+            String label;
             if (isAnonymousFqn(vertex)) {
                 // Kotlin "<anonymous>" renders under the enclosing source file's base name as the
                 // owner with $ as the enclosing-class separator (escaped for DOT).
-                dot.append(" label=\"")
-                        .append(escapeDotQuoted(anonymousOwnerLabel(vertex, codebaseGraphDTO)))
-                        .append("\"");
+                label = escapeDotQuoted(anonymousOwnerLabel(vertex, codebaseGraphDTO));
             } else {
-                dot.append(" label=\"").append(escapeDotQuoted(className)).append("\"");
+                label = escapeDotQuoted(className);
+            }
+
+            if (!label.equals(safeNodeId)) {
+                dot.append(" label=\"").append(label).append("\"");
             }
 
             if (classesToRemove.contains(vertex)) {

report/src/main/java/org/hjug/refactorfirst/report/JsonGenerator.java

@@ -80,6 +80,17 @@ public void execute(
         // copyViewerResources(dotRefactorFirstDir);
     }
 
+    /**
+     * Intentionally excluding hyperlinks in DOT to reduce JSON file size
+     *
+     * @param fqClassName The fully qualified class name
+     * @param repoUrl The repo URL
+     * @param codebaseGraphDTO The DTO containing the codebase graph
+     */
+    String hyperlinkClassForDot(String fqClassName, String repoUrl, CodebaseGraphDTO codebaseGraphDTO) {
+        return "";
+    }
+
     /** Copies the Mustache template and browser viewer into the report directory. */
     private void copyViewerResources(Path targetDir) {
         try {

report/src/test/java/org/hjug/refactorfirst/report/HtmlReportKotlinTest.java

@@ -53,6 +53,7 @@
  */
 class HtmlReportKotlinTest {
 
+    /** Verifies cycle DOT preserves Kotlin source links and edge weights while omitting redundant labels. */
     @DisplayName("HtmlReport.buildClassCycleDot emits .kt URLs from Kotlin source-path mapping")
     @Test
     void buildClassCycleDot_kotlinSourcePaths() {
@@ -95,9 +96,9 @@ void buildClassCycleDot_kotlinSourcePaths() {
                 KotlinCycleA -\\u003E KotlinCycleB [ label = "2" weight = "2" ];
                 KotlinCycleB -\\u003E KotlinCycleC [ label = "1" weight = "1" ];
                 KotlinCycleC -\\u003E KotlinCycleA [ label = "1" weight = "1" ];
-                KotlinCycleA [URL="https://github.com/refactorfirst/RefactorFirst/blob/src/main/kotlin/com/kotlin/cycles/KotlinCycleA.kt" target="_blank" label="KotlinCycleA"];
-                KotlinCycleB [URL="https://github.com/refactorfirst/RefactorFirst/blob/src/main/kotlin/com/kotlin/cycles/KotlinCycleB.kt" target="_blank" label="KotlinCycleB"];
-                KotlinCycleC [URL="https://github.com/refactorfirst/RefactorFirst/blob/src/main/kotlin/com/kotlin/cycles/KotlinCycleC.kt" target="_blank" label="KotlinCycleC"];
+                KotlinCycleA [URL="https://github.com/refactorfirst/RefactorFirst/blob/src/main/kotlin/com/kotlin/cycles/KotlinCycleA.kt" target="_blank"];
+                KotlinCycleB [URL="https://github.com/refactorfirst/RefactorFirst/blob/src/main/kotlin/com/kotlin/cycles/KotlinCycleB.kt" target="_blank"];
+                KotlinCycleC [URL="https://github.com/refactorfirst/RefactorFirst/blob/src/main/kotlin/com/kotlin/cycles/KotlinCycleC.kt" target="_blank"];
                 }`;\
                 """;
 

report/src/test/java/org/hjug/refactorfirst/report/HtmlReportTest.java

@@ -38,6 +38,7 @@ void getDescription() {
                 mavenReport.getDescription(Locale.getDefault()));
     }
 
+    /** Verifies cycle DOT preserves Java source links and edge weights while omitting redundant labels. */
     @Test
     void buildClassCycleDot() {
         Graph<String, DefaultWeightedEdge> classGraph = new DefaultDirectedWeightedGraph<>(DefaultWeightedEdge.class);
@@ -66,9 +67,9 @@ void buildClassCycleDot() {
                 + "A -\\u003E B [ label = \"2\" weight = \"2\" ];\n"
                 + "B -\\u003E C [ label = \"1\" weight = \"1\" ];\n"
                 + "C -\\u003E A [ label = \"1\" weight = \"1\" ];\n"
-                + "A [URL=\"https://github.com/refactorfirst/RefactorFirst/blob/src/main/java/org/hjug/refactorfirst/A.java\" target=\"_blank\" label=\"A\"];\n"
-                + "B [URL=\"https://github.com/refactorfirst/RefactorFirst/blob/src/main/java/org/hjug/refactorfirst/B.java\" target=\"_blank\" label=\"B\"];\n"
-                + "C [URL=\"https://github.com/refactorfirst/RefactorFirst/blob/src/main/java/org/hjug/refactorfirst/C.java\" target=\"_blank\" label=\"C\"];\n"
+                + "A [URL=\"https://github.com/refactorfirst/RefactorFirst/blob/src/main/java/org/hjug/refactorfirst/A.java\" target=\"_blank\"];\n"
+                + "B [URL=\"https://github.com/refactorfirst/RefactorFirst/blob/src/main/java/org/hjug/refactorfirst/B.java\" target=\"_blank\"];\n"
+                + "C [URL=\"https://github.com/refactorfirst/RefactorFirst/blob/src/main/java/org/hjug/refactorfirst/C.java\" target=\"_blank\"];\n"
                 + "}`;";
 
         assertEquals(expectedDot, dot);

report/src/test/java/org/hjug/refactorfirst/report/JsonGeneratorTest.java

@@ -166,7 +166,8 @@ void given_repoWithOrigin_when_reportGenerated_then_bubbleUrlsPointToSourceFiles
             complexMethod
                     .append("        if (a > ")
                     .append(i)
-                    .append(") { for (int j = 0; j < a; j++) { if (j % 2 == 0 && b) { c += j; } else { c -= j; } } }\n");
+                    .append(
+                            ") { for (int j = 0; j < a; j++) { if (j % 2 == 0 && b) { c += j; } else { c -= j; } } }\n");
         }
         Files.writeString(
                 new File(srcDir, "ComplexService.java").toPath(),