move jni type signature to jextract instead of JavaTypes

Author: madsodgaard

Sources/JExtractSwiftLib/Convenience/JavaType+Extensions.swift

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2025 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
+//
+//===----------------------------------------------------------------------===//
+
+import JavaTypes
+
+extension JavaType {
+  var jniTypeSignature: String {
+    switch self {
+    case .boolean: "Z"
+    case .byte: "B"
+    case .char: "C"
+    case .short: "S"
+    case .int: "I"
+    case .long: "J"
+    case .float: "F"
+    case .double: "D"
+    case .class(let package, let name):
+      if let package {
+        "L\(package.replacingOccurrences(of: ".", with: "/"))/\(name);"
+      } else {
+        "L\(name);"
+      }
+    case .array(let javaType): "[\(javaType.jniTypeSignature)"
+    case .void: fatalError("There is no type signature for 'void'")
+    }
+  }
+}

Sources/JavaTypes/JavaType+JNI.swift

@@ -12,12 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if canImport(FoundationEssentials)
-import FoundationEssentials
-#else
-import Foundation
-#endif
-
 extension JavaType {
   /// Map this Java type to the appropriate JNI type name.
   package var jniTypeName: String {
@@ -63,25 +57,4 @@ extension JavaType {
     case .void: fatalError("There is no field name for 'void'")
     }
   }
-
-  package var jniTypeSignature: String {
-    switch self {
-    case .boolean: "Z"
-    case .byte: "B"
-    case .char: "C"
-    case .short: "S"
-    case .int: "I"
-    case .long: "J"
-    case .float: "F"
-    case .double: "D"
-    case .class(let package, let name):
-      if let package {
-        "L\(package.replacingOccurrences(of: ".", with: "/"))/\(name);"
-      } else {
-        "L\(name);"
-      }
-    case .array(let javaType): "[\(javaType.jniTypeSignature)"
-    case .void: fatalError("There is no type signature for 'void'")
-    }
-  }
 }