Generate Component Before the Last Round (#345)

* Generate Component Before the Last Round

* Update ValidationProcessor.java

* Add some comments for generateComponent

---------

Co-authored-by: Rob Bygrave <robin.bygrave@gmail.com>

Author: SentryMan

validator-generator/src/main/java/io/avaje/validation/generator/ValidationProcessor.java

@@ -70,6 +70,8 @@ public final class ValidationProcessor extends AbstractProcessor {
   private final SimpleComponentWriter componentWriter = new SimpleComponentWriter(metaData);
   private boolean readModuleInfo;
   private boolean processedAnything;
+  private boolean generateComponent;
+  private int rounds;
 
   @Override
   public SourceVersion getSupportedSourceVersion() {
@@ -112,9 +114,10 @@ private void readModule() {
 
   @Override
   public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment round) {
-    if (round.errorRaised()) {
+    if (generateComponent || round.errorRaised()) {
       return false;
     }
+    generateComponent = rounds++ > 0;
     APContext.setProjectModuleElement(annotations, round);
     readModule();
     getElements(round, AvajeConstraintPrism.PRISM_TYPE).ifPresent(this::writeConstraintAdapters);
@@ -139,13 +142,19 @@ public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment
 
     metaData.fullName(false);
     cascadeTypes();
-    writeComponent(round.processingOver());
+    writeComponent(generateComponent);
     return false;
   }
 
   // Optional because these annotations are not guaranteed to exist
   private Optional<? extends Set<? extends Element>> getElements(RoundEnvironment round, String name) {
-    return Optional.ofNullable(typeElement(name)).map(round::getElementsAnnotatedWith);
+    var op =
+        Optional.ofNullable(typeElement(name))
+            .map(round::getElementsAnnotatedWith)
+            .filter(n -> !n.isEmpty());
+    // skip generateComponent if anything needs processing in this round
+    generateComponent = generateComponent && op.isEmpty();
+    return op;
   }
 
   private void registerCustomAdapters(Set<? extends Element> elements) {
@@ -203,6 +212,8 @@ private void cascadeTypesInner() {
     }
     for (final String type : extraTypes) {
       if (!ignoreType(type)) {
+        // skip generateComponent for this round due to cascade
+        generateComponent = false;
         final TypeElement element = typeElement(type);
         if (cascadeElement(element)) {
           writeAdapterForType(element);