perf(hibernate processor): fix nullable things in util package

Author: kingg22

tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/TypeRenderingVisitor.java

@@ -26,6 +26,7 @@
 
 import org.jspecify.annotations.Nullable;
 
+import static java.util.Objects.requireNonNull;
 import static org.hibernate.processor.util.Constants.JAVA_OBJECT;
 
 /**
@@ -45,7 +46,7 @@ public static String toString(TypeMirror typeMirror) {
 			final Element typeVariableElement = ( (TypeVariable) typeMirror ).asElement();
 			if ( typeVariableElement instanceof TypeParameterElement ) {
 				final TypeParameterElement typeParameter = (TypeParameterElement) typeVariableElement;
-				if ( typeParameter.getEnclosingElement().getKind() == ElementKind.METHOD ) {
+				if ( requireNonNull( typeParameter.getEnclosingElement() ).getKind() == ElementKind.METHOD ) {
 					// But for method level type variable we return the upper bound
 					// because the type variable has no meaning except for that method
 					typeMirror = ( (TypeVariable) typeMirror ).getUpperBound();
@@ -106,7 +107,7 @@ else if ( typeMirror instanceof IntersectionType ) {
 	}
 
 	@Override
-	public @Nullable Object visitArray(ArrayType t, @Nullable Object o) {
+	public Object visitArray(ArrayType t, @Nullable Object o) {
 		t.getComponentType().accept( this, null );
 		sb.append( "[]" );
 		return t;

tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/TypeUtils.java

@@ -163,7 +163,7 @@ public static String extractClosestRealTypeAsString(TypeMirror type, Context con
 		}
 	}
 
-	public static @Nullable TypeMirror extractClosestRealType(TypeMirror type, Context context, Set<TypeVariable> beingVisited) {
+	public static @Nullable TypeMirror extractClosestRealType(@Nullable TypeMirror type, Context context, Set<TypeVariable> beingVisited) {
 		if ( type == null ) {
 			return null;
 		}
@@ -722,7 +722,7 @@ public static String getGeneratedClassFullyQualifiedName(TypeElement typeElement
 				+ "." + (jakartaDataStyle ? '_' + simpleName : simpleName + '_');
 	}
 
-	private static String qualifiedName(Element enclosingElement, boolean jakartaDataStyle) {
+	private static String qualifiedName(@Nullable Element enclosingElement, boolean jakartaDataStyle) {
 		if ( enclosingElement instanceof TypeElement typeElement ) {
 			return getGeneratedClassFullyQualifiedName( typeElement, jakartaDataStyle );
 		}