wrap-java: support java record types

Simple addition to support record types using existing infra.
This adds a new macro but it is just sugar over the existing JavaClass
macro

Author: ktoso

Samples/JavaKitSampleApp/Sources/JavaKitExample/com/example/swift/Point.java

@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2026 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of Swift.org project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+package com.example.swift;
+
+/**
+ * Java 16+ record used to smoke-test wrap-java's <code>@JavaRecord</code>
+ * emission end-to-end: reflection sees this as a record, wrap-java produces
+ * a Swift wrapper with the canonical constructor plus the {@code x()} /
+ * {@code y()} component accessors, and the runtime test round-trips values
+ * through the JNI boundary.
+ */
+public record Point(int x, int y) {}

Samples/JavaKitSampleApp/Sources/JavaKitExample/swift-java.config

@@ -4,6 +4,7 @@
     "com.example.swift.HelloSubclass" : "HelloSubclass",
     "com.example.swift.HelloJavaKitArrays" : "HelloJavaKitArrays",
     "com.example.swift.JavaKitSampleMain" : "JavaKitSampleMain",
+    "com.example.swift.Point" : "Point",
     "com.example.swift.ThreadSafeHelperClass" : "ThreadSafeHelperClass"
   }
 }

Sources/SwiftJava/Macros.swift

@@ -45,6 +45,46 @@ public macro JavaClass(
   implements: (any AnyJavaObject.Type)?...
 ) = #externalMacro(module: "SwiftJavaMacros", type: "JavaClassMacro")
 
+/// Attached macro that declares that a particular Swift type is a wrapper around a Java `record`.
+///
+/// This behaves identically to ``JavaClass`` today (records are wrapped as
+/// classes on the Swift side, exposing the canonical constructor and the
+/// component accessor methods)
+///
+/// Usage:
+///
+/// ```swift
+/// @JavaRecord("com.example.Point")
+/// open class Point: JavaObject {
+///   @JavaMethod
+///   @_nonoverride public convenience init(_ x: Int32, _ y: Int32, environment: JNIEnvironment? = nil)
+///
+///   @JavaMethod open func x() -> Int32
+///   @JavaMethod open func y() -> Int32
+/// }
+/// ```
+///
+/// Would correspond to a Java record like this:
+/// ```java
+/// package com.example;
+///
+/// public record Point(int x, int y) {}
+/// ```
+@attached(
+  member,
+  names: named(fullJavaClassName),
+  named(javaHolder),
+  named(init(javaHolder:)),
+  named(JavaSuperclass),
+  named(`as`)
+)
+@attached(extension, conformances: AnyJavaObject)
+public macro JavaRecord(
+  _ fullClassName: String,
+  extends: (any AnyJavaObject.Type)? = nil,
+  implements: (any AnyJavaObject.Type)?...
+) = #externalMacro(module: "SwiftJavaMacros", type: "JavaClassMacro")
+
 /// Attached macro that declares that a particular `struct` type is a wrapper around a Java interface.
 ///
 /// Use this macro to describe a type that was implemented as an

Sources/SwiftJavaDocumentation/Documentation.docc/SupportedFeatures.md

@@ -30,12 +30,13 @@ Java `native` functions. SwiftJava simplifies the type conversions
 |----------------------------------------|---------------|
 | Java `class`                           | ✅             |
 | Java class inheritance                 | ✅             |
+| Java methods: `static`, member           | ✅ `@JavaMethod` |
 | Java `abstract class`                  | TODO          |
 | Java `enum`                            | ❌             |
-| Java methods: `static`, member           | ✅ `@JavaMethod` |
+| Java `record` (Java 16+)               | ✅ `@JavaRecord` |
+| Java `sealed class` / `sealed interface` (Java 17+) | 🟡 recognized, but missing special handling of `permits` list |
 | **This list is very work in progress** |               |    
 
-
 ### JExtract – calling Swift from Java
 
 SwiftJava's `swift-java jextract` tool automates generating Java bindings from Swift sources.

Sources/SwiftJavaMacros/GenerationMode.swift

@@ -31,7 +31,7 @@ enum GenerationMode {
   /// Determine the mode for Java class generation based on an attribute.
   init?(attribute: AttributeSyntax) {
     switch attribute.attributeName.trimmedDescription {
-    case "JavaClass", "JavaInterface":
+    case "JavaClass", "JavaInterface", "JavaRecord":
       self = .importFromJava
 
     case "ExportToJavaClass":

Sources/SwiftJavaToolLib/JavaClassTranslator.swift

@@ -385,6 +385,28 @@ extension JavaClassTranslator {
     return allDecls
   }
 
+  /// Render additional documentation about the Java type, e.g. if it was a `sealed` type, etc.
+  private func renderJavaKindDocc() -> String {
+    var lines: [String] = []
+    if javaClass.isRecord() {
+      lines.append("/// Java record: `\(javaClass.getName())`")
+    }
+    if javaClass.isSealed() {
+      let kind = javaClass.isInterface() ? "sealed interface" : "sealed class"
+      let permits = javaClass.getPermittedSubclasses().compactMap { $0?.getName() }
+      if permits.isEmpty {
+        lines.append("/// Java `\(kind)`")
+      } else {
+        lines.append("/// Java `\(kind)`, permits: \(permits.map({ "`\($0)`" }).joined(separator: ", "))")
+      }
+      log.info("Wrap Java \(kind): `\(javaClass.getName())`, permits: \(permits.map({ "`\($0)`" }).joined(separator: ", ")))")
+    }
+    if lines.isEmpty {
+      return ""
+    }
+    return lines.joined(separator: "\n") + "\n"
+  }
+
   /// Render the declaration for the main part of the Java class, which
   /// includes the constructors, non-static fields, and non-static methods.
   private func renderPrimaryType() -> DeclSyntax {
@@ -478,16 +500,26 @@ extension JavaClassTranslator {
       }
 
     // Emit the struct declaration describing the java class.
-    let classOrInterface: String = isInterface ? "JavaInterface" : "JavaClass"
+    // Records are wrapped like classes today, but tagged with @JavaRecord so the
+    // "was a record" signal survives into the generated Swift and downstream tools.
+    let classOrInterface: String =
+      if isInterface {
+        "JavaInterface"
+      } else if javaClass.isRecord() {
+        "JavaRecord"
+      } else {
+        "JavaClass"
+      }
     let introducer = translateAsClass ? "open class" : "public struct"
     let classAvailableAttributes = swiftAvailableAttributes(
       from: annotations,
       runtimeInvisibleAnnotations: self.runtimeInvisibleAnnotations.classAnnotations,
       javaClass: javaClass
     )
+    let javaKindDocs = renderJavaKindDocc()
     var classDecl: DeclSyntax =
       """
-      \(raw: classAvailableAttributes.render())@\(raw: classOrInterface)(\(literal: javaClass.getName())\(raw: extendsClause)\(raw: interfacesStr))
+      \(raw: javaKindDocs)\(raw: classAvailableAttributes.render())@\(raw: classOrInterface)(\(literal: javaClass.getName())\(raw: extendsClause)\(raw: interfacesStr))
       \(raw: introducer) \(raw: swiftInnermostTypeName)\(raw: genericParameterClause)\(raw: inheritanceClause) {
       \(raw: members.map { $0.description }.joined(separator: "\n\n"))
       }

Tests/SwiftJavaMacrosTests/JavaClassMacroTests.swift

@@ -22,6 +22,7 @@ import XCTest
 class JavaKitMacroTests: XCTestCase {
   static let javaKitMacros: [String: any Macro.Type] = [
     "JavaClass": JavaClassMacro.self,
+    "JavaRecord": JavaClassMacro.self,
     "JavaMethod": JavaMethodMacro.self,
     "JavaField": JavaFieldMacro.self,
     "JavaStaticMethod": JavaMethodMacro.self,
@@ -468,6 +469,64 @@ class JavaKitMacroTests: XCTestCase {
     )
   }
 
+  func testJavaRecord() throws {
+    assertMacroExpansion(
+      """
+        @JavaRecord("com.example.Point")
+        open class Point: JavaObject {
+          @JavaMethod
+          @_nonoverride public convenience init(_ x: Int32, _ y: Int32, environment: JNIEnvironment? = nil)
+
+          @JavaMethod
+          open func x() -> Int32
+        }
+      """,
+      expandedSource: """
+
+          open class Point: JavaObject {
+            @_nonoverride public convenience init(_ x: Int32, _ y: Int32, environment: JNIEnvironment? = nil) {
+                let _environment = if let environment {
+                    environment
+                } else {
+                    try! JavaVirtualMachine.shared().environment()
+                }
+                let javaThis = try! Self.dynamicJavaNewObjectInstance(in: _environment, arguments: x.self, y.self)
+                self.init(javaThis: javaThis, environment: _environment)
+            }
+            open func x() -> Int32 {
+                return {
+                  do {
+                    return try dynamicJavaMethodCall(methodName: "x", resultType: Int32.self)
+                  } catch {
+                    if let throwable = error as? Throwable {
+                  let sw = StringWriter()
+                  let pw = PrintWriter(sw)
+                  throwable.printStackTrace(pw)
+                  fatalError("Java call threw unhandled exception: \\(error)\\n\\(sw.toString())")
+                    }
+                    fatalError("Java call threw unhandled exception: \\(error)")
+                  }
+                }()
+            }
+
+              /// The full Java class name for this Swift type.
+              open override class var fullJavaClassName: String {
+                #if os(Android) && AndroidCoreLibraryDesugaring
+                  AndroidSupport.androidDesugarClassNameConversion(for: "com.example.Point")
+                #else
+                  "com.example.Point"
+                #endif
+              }
+
+              public required init(javaHolder: JavaObjectHolder) {
+                  super.init(javaHolder: javaHolder)
+              }
+          }
+        """,
+      macros: Self.javaKitMacros
+    )
+  }
+
   func testJavaGenericClassGenericMethodParameter() throws {
     assertMacroExpansion(
       """

Tests/SwiftJavaToolLibTests/CompileJavaTool.swift

@@ -74,7 +74,10 @@ struct CompileJavaTool {
   static func compileJava(_ sourceText: String) async throws -> Foundation.URL {
     // Java requires public class files to be named after the class
     let sourceFile: Foundation.URL
-    if let match = sourceText.range(of: #"public\s+class\s+(\w+)"#, options: .regularExpression) {
+    // Allow arbitrary modifiers between `public` and the decl introducer keyword.
+    // The `-` is allowed because `non-sealed`.
+    let publicTypeRegex = #"public\s+(?:[\w-]+\s+)*(?:class|record|interface|enum)\s+(\w+)"#
+    if let match = sourceText.range(of: publicTypeRegex, options: .regularExpression) {
       let classNameRange = sourceText[match]
       let className = classNameRange.split(separator: " ").last.map(String.init) ?? "tmp_\(UUID().uuidString)"
       let dir = FileManager.default.temporaryDirectory