Java2Swift: Include protected methods in generated classes

Swift doesn't have the notion of "protected", so treat these as "open"
(or "public") as approriate.

Author: DougGregor

Sources/Java2SwiftLib/JavaClassTranslator.swift

@@ -181,8 +181,8 @@ struct JavaClassTranslator {
     for method in methods {
       guard let method else { continue }
 
-      // Only look at public methods here.
-      guard method.isPublic else { continue }
+      // Only look at public and protected methods here.
+      guard method.isPublic || method.isProtected else { continue }
 
       // Skip any methods that are expected to be implemented in Swift. We will
       // visit them in the second pass, over the *declared* methods, because

Sources/JavaKitReflection/Method+Utilities.swift

@@ -18,6 +18,11 @@ extension Method {
     return (getModifiers() & 1) != 0
   }
 
+  /// Whether this is a 'protected' method.
+  public var isProtected: Bool {
+    return (getModifiers() & 4) != 0
+  }
+
   /// Whether this is a 'static' method.
   public var isStatic: Bool {
     return (getModifiers() & 0x08) != 0

Tests/Java2SwiftTests/Java2SwiftTests.swift

@@ -289,7 +289,11 @@ class Java2SwiftTests: XCTestCase {
         """
           @JavaMethod
           open func wait() throws
+        """,
         """
+          @JavaMethod
+          open func clone() throws -> JavaObject!
+        """,
       ]
     )
   }