From 987169b174e693e3949e5fff85527e9ffcaa2121 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 19 Jun 2026 18:56:55 +0100
Subject: Generate arbitrary Java value for enum

---
 .../generators/javatypes/JavaTypesGenerator.java    | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
index bd56880..4bfda14 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
@@ -108,7 +108,7 @@ public class JavaTypesGenerator implements Generator {
         return new JavaEnumDeclaration(
             enumDefinition.name(),
             enumDefinition.variants().stream()
-                .map(variant -> new JavaEnumConstant(Casing.lowerCamelCaseToUpperCase(variant.name())))
+                .map(variant -> new JavaEnumConstant(generateEnumConstantName(variant.name())))
                 .toList(),
             JavaCustomArea.forType(generateTypeRef(enumDefinition.type(), context), "body"),
             enumDefinition.docComment()
@@ -347,7 +347,10 @@ public class JavaTypesGenerator implements Generator {
             }
 
             case EnumType enumType -> {
-                throw new UnsupportedOperationException("TODO");
+                yield new JavaStaticFieldAccess(
+                    generateTypeRef(enumType, context),
+                    generateEnumConstantName(context.enumVariants(enumType).getFirst().name())
+                );
             }
 
             case SimpleNativeType simpleNativeType -> {
@@ -387,7 +390,7 @@ public class JavaTypesGenerator implements Generator {
         var seenTypes = new HashSet<Type>();
         seenTypes.add(sumType);
         // TODO: better error
-        return context.variants(sumType).stream()
+        return context.sumVariants(sumType).stream()
             .filter(variant -> isNonRecursivelyConstructable(variant, seenTypes, context))
             .findFirst()
             .orElseThrow();
@@ -419,7 +422,7 @@ public class JavaTypesGenerator implements Generator {
             case SumType sumType -> {
                 var newSeenTypes = new HashSet<>(seenTypes);
                 newSeenTypes.add(type);
-                var result = context.variants(sumType).stream()
+                var result = context.sumVariants(sumType).stream()
                     .anyMatch(variant -> isNonRecursivelyConstructable(variant, seenTypes, context));
                 yield result;
             }
@@ -432,6 +435,10 @@ public class JavaTypesGenerator implements Generator {
         };
     }
 
+    private static String generateEnumConstantName(String name) {
+        return Casing.lowerCamelCaseToUpperCase(name);
+    }
+
     private Optional<JavaNativeTypeConfig> nativeTypeConfig(SimpleNativeType type) {
         return this.javaGeneratorConfig.nativeTypeConfig(type);
     }
@@ -443,6 +450,10 @@ public class JavaTypesGenerator implements Generator {
             this.typesInfo = typesInfo;
         }
 
+        public List<EnumVariant> enumVariants(EnumType type) {
+            return this.typesInfo.enumVariants(type);
+        }
+
         public List<Field> fieldsOf(StructType type) {
             return this.typesInfo.fieldsOf(type);
         }
@@ -451,7 +462,7 @@ public class JavaTypesGenerator implements Generator {
             return this.typesInfo.variantOf(type);
         }
 
-        public List<Type> variants(SumType type) {
+        public List<Type> sumVariants(SumType type) {
             return this.typesInfo.sumVariants(type);
         }
     }
-- 
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