Add Fields to Java2Swift Tool

Makefile

@@ -55,7 +55,7 @@ generate-JavaKit: Java2Swift
 
 generate-JavaKitReflection: Java2Swift generate-JavaKit
 	mkdir -p Sources/JavaKitReflection/generated
-	$(BUILD_DIR)/debug/Java2Swift --module-name JavaKitReflection --manifests Sources/JavaKit/generated/JavaKit.swift2java -o Sources/JavaKitReflection/generated java.lang.reflect.Method java.lang.reflect.Type java.lang.reflect.Constructor java.lang.reflect.Parameter java.lang.reflect.ParameterizedType java.lang.reflect.Executable java.lang.reflect.AnnotatedType java.lang.reflect.TypeVariable java.lang.reflect.WildcardType java.lang.reflect.GenericArrayType java.lang.reflect.AccessibleObject java.lang.annotation.Annotation java.lang.reflect.GenericDeclaration
+	$(BUILD_DIR)/debug/Java2Swift --module-name JavaKitReflection --manifests Sources/JavaKit/generated/JavaKit.swift2java -o Sources/JavaKitReflection/generated java.lang.reflect.Method java.lang.reflect.Type java.lang.reflect.Constructor java.lang.reflect.Parameter java.lang.reflect.ParameterizedType java.lang.reflect.Executable java.lang.reflect.AnnotatedType java.lang.reflect.TypeVariable java.lang.reflect.WildcardType java.lang.reflect.GenericArrayType java.lang.reflect.AccessibleObject java.lang.annotation.Annotation java.lang.reflect.GenericDeclaration java.lang.reflect.Field
 
 generate-JavaKitJar: Java2Swift generate-JavaKit
 	mkdir -p Sources/JavaKitJar/generated

Sources/Java2Swift/JavaTranslator.swift

@@ -243,6 +243,26 @@ extension JavaTranslator {
 
     // Members
     var members: [DeclSyntax] = []
+
+    // Fields
+    var staticFields: [Field] = []
+    members.append(
+      contentsOf: javaClass.getFields().compactMap {
+        $0.flatMap { field in
+          if field.isStatic {
+            staticFields.append(field)
+            return nil
+          }
+
+          do {
+            return try translateField(field)
+          } catch {
+            logUntranslated("Unable to translate '\(fullName)' field '\(field.getName())': \(error)")
+            return nil
+          }
+        }
+      }
+    )
 
     // Constructors
     members.append(
@@ -327,6 +347,8 @@ extension JavaTranslator {
 
     // Format the class declaration.
     classDecl = classDecl.formatted(using: format).cast(DeclSyntax.self)
+
+    // TODO: Handle static fields in https://github.com/swiftlang/swift-java/issues/39
 
     if staticMethods.isEmpty {
       return [classDecl]
@@ -422,6 +444,15 @@ extension JavaTranslator {
       public func \(raw: javaMethod.getName())\(raw: genericParameterClause)(\(raw: parametersStr))\(raw: throwsStr)\(raw: resultTypeStr)\(raw: whereClause)
       """
   }
+
+    func translateField(_ javaField: Field) throws -> DeclSyntax {
+        let typeName = try getSwiftTypeNameAsString(javaField.getGenericType()!, outerOptional: true)
+        let fieldAttribute: AttributeSyntax = "@JavaField";
+        return """
+        \(fieldAttribute)
+        public var \(raw: javaField.getName()): \(raw: typeName)
+        """
+    }
 
   // Translate a Java parameter list into Swift parameters.
   private func translateParameters(_ parameters: [Parameter?]) throws -> [FunctionParameterSyntax] {

Sources/JavaKitReflection/Field+Utilities.swift

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 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
+//
+//===----------------------------------------------------------------------===//
+
+extension Field {
+    /// Whether this is a 'static' field.
+    public var isStatic: Bool {
+      return (getModifiers() & 0x08) != 0
+    }
+}

Sources/JavaKitReflection/JavaClass+Reflection.swift

@@ -28,6 +28,9 @@ extension JavaClass {
 
   @JavaMethod
   public func getMethods() -> [Method?]
+
+  @JavaMethod
+  public func getFields() -> [Field?]
 
   @JavaMethod
   public func getConstructors() -> [Constructor<ObjectType>?]

Sources/JavaKitReflection/generated/Field.swift

@@ -0,0 +1,151 @@
+// Auto-generated by Java-to-Swift wrapper generator.
+import JavaKit
+import JavaRuntime
+
+@JavaClass("java.lang.reflect.Field", extends: AccessibleObject.self)
+public struct Field {
+  @JavaMethod
+  public func getName() -> String
+
+  @JavaMethod
+  public func get(_ arg0: JavaObject?) throws -> JavaObject?
+
+  @JavaMethod
+  public func equals(_ arg0: JavaObject?) -> Bool
+
+  @JavaMethod
+  public func toString() -> String
+
+  @JavaMethod
+  public func hashCode() -> Int32
+
+  @JavaMethod
+  public func getModifiers() -> Int32
+
+  @JavaMethod
+  public func getBoolean(_ arg0: JavaObject?) throws -> Bool
+
+  @JavaMethod
+  public func getByte(_ arg0: JavaObject?) throws -> Int8
+
+  @JavaMethod
+  public func getShort(_ arg0: JavaObject?) throws -> Int16
+
+  @JavaMethod
+  public func getChar(_ arg0: JavaObject?) throws -> UInt16
+
+  @JavaMethod
+  public func getInt(_ arg0: JavaObject?) throws -> Int32
+
+  @JavaMethod
+  public func getLong(_ arg0: JavaObject?) throws -> Int64
+
+  @JavaMethod
+  public func getFloat(_ arg0: JavaObject?) throws -> Float
+
+  @JavaMethod
+  public func getDouble(_ arg0: JavaObject?) throws -> Double
+
+  @JavaMethod
+  public func toGenericString() -> String
+
+  @JavaMethod
+  public func isSynthetic() -> Bool
+
+  @JavaMethod
+  public func getDeclaringClass() -> JavaClass<JavaObject>?
+
+  @JavaMethod
+  public func getAnnotation(_ arg0: JavaClass<Annotation>?) -> Annotation?
+
+  @JavaMethod
+  public func getAnnotationsByType(_ arg0: JavaClass<Annotation>?) -> [Annotation?]
+
+  @JavaMethod
+  public func getDeclaredAnnotations() -> [Annotation?]
+
+  @JavaMethod
+  public func set(_ arg0: JavaObject?, _ arg1: JavaObject?) throws
+
+  @JavaMethod
+  public func setAccessible(_ arg0: Bool)
+
+  @JavaMethod
+  public func getGenericType() -> Type?
+
+  @JavaMethod
+  public func getType() -> JavaClass<JavaObject>?
+
+  @JavaMethod
+  public func setBoolean(_ arg0: JavaObject?, _ arg1: Bool) throws
+
+  @JavaMethod
+  public func setByte(_ arg0: JavaObject?, _ arg1: Int8) throws
+
+  @JavaMethod
+  public func setChar(_ arg0: JavaObject?, _ arg1: UInt16) throws
+
+  @JavaMethod
+  public func setShort(_ arg0: JavaObject?, _ arg1: Int16) throws
+
+  @JavaMethod
+  public func setInt(_ arg0: JavaObject?, _ arg1: Int32) throws
+
+  @JavaMethod
+  public func setLong(_ arg0: JavaObject?, _ arg1: Int64) throws
+
+  @JavaMethod
+  public func setFloat(_ arg0: JavaObject?, _ arg1: Float) throws
+
+  @JavaMethod
+  public func setDouble(_ arg0: JavaObject?, _ arg1: Double) throws
+
+  @JavaMethod
+  public func isEnumConstant() -> Bool
+
+  @JavaMethod
+  public func getAnnotatedType() -> AnnotatedType?
+
+  @JavaMethod
+  public func isAnnotationPresent(_ arg0: JavaClass<Annotation>?) -> Bool
+
+  @JavaMethod
+  public func getAnnotations() -> [Annotation?]
+
+  @JavaMethod
+  public func getDeclaredAnnotation(_ arg0: JavaClass<Annotation>?) -> Annotation?
+
+  @JavaMethod
+  public func getDeclaredAnnotationsByType(_ arg0: JavaClass<Annotation>?) -> [Annotation?]
+
+  @JavaMethod
+  public func trySetAccessible() -> Bool
+
+  @JavaMethod
+  public func canAccess(_ arg0: JavaObject?) -> Bool
+
+  @JavaMethod
+  public func isAccessible() -> Bool
+
+  @JavaMethod
+  public func getClass() -> JavaClass<JavaObject>?
+
+  @JavaMethod
+  public func notify()
+
+  @JavaMethod
+  public func notifyAll()
+
+  @JavaMethod
+  public func wait(_ arg0: Int64) throws
+
+  @JavaMethod
+  public func wait(_ arg0: Int64, _ arg1: Int32) throws
+
+  @JavaMethod
+  public func wait() throws
+}
+extension JavaClass<Field> {
+  @JavaStaticMethod
+  public func setAccessible(_ arg0: [AccessibleObject?], _ arg1: Bool)
+}

Sources/JavaKitReflection/generated/JavaKitReflection.swift2java

@@ -6,6 +6,7 @@
     "java.lang.reflect.AnnotatedType" : "AnnotatedType",
     "java.lang.reflect.Constructor" : "Constructor",
     "java.lang.reflect.Executable" : "Executable",
+    "java.lang.reflect.Field" : "Field",
     "java.lang.reflect.GenericArrayType" : "GenericArrayType",
     "java.lang.reflect.GenericDeclaration" : "GenericDeclaration",
     "java.lang.reflect.Method" : "Method",