Generate Value Types when on Valhalla (#249)

* generate value types

* Format, remove unused method

---------

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

Author: SentryMan

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

@@ -92,7 +92,7 @@ private void writeClassStart() {
       writer.append("@ConstraintAdapter(%s.class)", beanReader.contraintTarget()).eol();
     }
 
-    writer.append("public final class %sValidationAdapter implements ValidationAdapter<%s> ", adapterShortName, beanReader.shortName());
+    writer.append("public final %sclass %sValidationAdapter implements ValidationAdapter<%s> ", Util.valhalla(), adapterShortName, beanReader.shortName());
     writer.append("{").eol().eol();
   }
 

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

@@ -117,7 +117,7 @@ private void writeClassStart() {
     writeMetaDataEntry(all);
     writer.append("})").eol();
 
-    writer.append("public class %s implements GeneratedComponent {", shortName).eol().eol();
+    writer.append("public %sclass %s implements GeneratedComponent {", Util.valhalla(), shortName).eol().eol();
   }
 
   private void writeMetaDataEntry(List<String> entries) {

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

@@ -19,24 +19,18 @@ final class SimpleParamBeanWriter {
   SimpleParamBeanWriter(ValidMethodReader beanReader) {
     this.beanReader = beanReader;
     final var method = beanReader.getBeanType();
-
     this.adapterPackage = ProcessorUtils.packageOf(method.getEnclosingElement().asType().toString());
-    adapterFullName =
-        adapterPackage
-            + "."
-            + method
-                .getSimpleName()
-                .toString()
-                .transform(str -> str.substring(0, 1).toUpperCase() + str.substring(1))
-            + "ParamProvider";
+    this.adapterFullName = adapterPackage
+      + "."
+      + method
+      .getSimpleName()
+      .toString()
+      .transform(str -> str.substring(0, 1).toUpperCase() + str.substring(1))
+      + "ParamProvider";
 
     this.adapterShortName = Util.shortName(adapterFullName);
   }
 
-  String fullName() {
-    return adapterFullName;
-  }
-
   private Writer createFileWriter() throws IOException {
     final JavaFileObject jfo = createSourceFile(adapterFullName);
     return jfo.openWriter();
@@ -62,14 +56,14 @@ private void writePackage() {
 
   private void writeClassStart() {
     writer
-        .append(
-            """
-                @Generated("avaje-validator-generator")
-                @Named
-                @%s
-                public final class %s implements MethodAdapterProvider {""",
-            Util.shortName(diAnnotation()), adapterShortName)
-        .eol();
+      .append(
+        """
+          @Generated("avaje-validator-generator")
+          @Named
+          @%s
+          public final %sclass %s implements MethodAdapterProvider {""",
+        Util.shortName(diAnnotation()), Util.valhalla(), adapterShortName)
+      .eol();
   }
 
   private void writeMethods() {

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

@@ -158,4 +158,14 @@ static boolean isPublic(Element element) {
     }
     return !ProcessingContext.isImported(element);
   }
+
+  static String valhalla() {
+    try {
+      if (Modifier.valueOf("VALUE") != null && APContext.previewEnabled()) return "value ";
+    } catch (IllegalArgumentException e) {
+      // no valhalla
+    }
+    return "";
+  }
+
 }