From 887e9c61f8522d15f46e0899a042a3b22c6e3b03 Mon Sep 17 00:00:00 2001
From: Knut Wannheden <knut@moderne.io>
Date: Mon, 6 Nov 2023 21:21:24 +0100
Subject: [PATCH] Improve `isAssignableTo()` for primitive wrapper types

---
 .../org/openrewrite/java/tree/JavaType.java   | 27 +++++++++++++++++++
 .../org/openrewrite/java/tree/TypeUtils.java  |  6 +++++
 2 files changed, 33 insertions(+)

diff --git a/rewrite-java/src/main/java/org/openrewrite/java/tree/JavaType.java b/rewrite-java/src/main/java/org/openrewrite/java/tree/JavaType.java
index aa29dfd44c0..2759aefba45 100644
--- a/rewrite-java/src/main/java/org/openrewrite/java/tree/JavaType.java
+++ b/rewrite-java/src/main/java/org/openrewrite/java/tree/JavaType.java
@@ -921,6 +921,33 @@ public static Primitive fromKeyword(String keyword) {
             return null;
         }
 
+        @Nullable
+        public static Primitive fromClassName(String className) {
+            switch (className) {
+                case "java.lang.Boolean":
+                    return Boolean;
+                case "java.lang.Byte":
+                    return Byte;
+                case "java.lang.Character":
+                    return Char;
+                case "java.lang.Double":
+                    return Double;
+                case "java.lang.Float":
+                    return Float;
+                case "java.lang.Integer":
+                    return Int;
+                case "java.lang.Long":
+                    return Long;
+                case "java.lang.Short":
+                    return Short;
+                case "java.lang.Void":
+                    return Void;
+                case "java.lang.String":
+                    return String;
+            }
+            return null;
+        }
+
         public String getKeyword() {
             switch (this) {
                 case Boolean:
diff --git a/rewrite-java/src/main/java/org/openrewrite/java/tree/TypeUtils.java b/rewrite-java/src/main/java/org/openrewrite/java/tree/TypeUtils.java
index c4561301549..89034bd0985 100644
--- a/rewrite-java/src/main/java/org/openrewrite/java/tree/TypeUtils.java
+++ b/rewrite-java/src/main/java/org/openrewrite/java/tree/TypeUtils.java
@@ -205,6 +205,12 @@ public static boolean isAssignableTo(@Nullable JavaType to, @Nullable JavaType f
                        IntStream.range(0, parameterCount).allMatch(i -> isAssignableTo(toParameters.get(i), fromParameters.get(i)));
             } else if (to instanceof JavaType.FullyQualified) {
                 JavaType.FullyQualified toFq = (JavaType.FullyQualified) to;
+                if (from instanceof JavaType.Primitive) {
+                    JavaType.Primitive toPrimitive = JavaType.Primitive.fromClassName(toFq.getFullyQualifiedName());
+                    if (toPrimitive != null) {
+                        return isAssignableTo(toPrimitive, from);
+                    }
+                }
                 return isAssignableTo(toFq.getFullyQualifiedName(), from);
             } else if (to instanceof JavaType.GenericTypeVariable) {
                 JavaType.GenericTypeVariable toGeneric = (JavaType.GenericTypeVariable) to;