Enable variable and typemap substitution in typemap kwargs, and a test that verifies this works for directorin:descriptor.

Examples/test-suite/java/java_director_ptrclass_runme.java

@@ -0,0 +1,47 @@
+
+import java_director_ptrclass.*;
+
+public class java_director_ptrclass_runme {
+
+  static {
+    try {
+      System.loadLibrary("java_director_ptrclass");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String argv[]) {
+    Foo f = new Foo();
+    Foo ft = new TouchingFoo(); 
+    Baz b = new Baz();
+    if (b.GetTouched()) {
+      throw new RuntimeException ( "Baz should not have been touched yet." );
+    }
+
+    Baz b2 = f.FinalMaybeTouch(b);
+
+    if (b2.GetTouched() || b.GetTouched()) {
+      throw new RuntimeException ( "Baz should not have been touched by Foo." );
+    }
+
+    Baz b3 = ft.FinalMaybeTouch(b);
+
+    if (!b.GetTouched() || !b3.GetTouched() || !b2.GetTouched()) {
+      throw new RuntimeException ( "Baz was not touched by TouchingFoo. This" +
+                                   " might mean the directorin typemap is not" +
+                                   " parsing the typemap(jstype, Bar) in its" +
+                                   " 'descriptor' kwarg correctly." );
+    }
+  }
+}
+
+class TouchingFoo extends Foo {
+  @Override
+  public Baz MaybeTouch(Baz baz_ptr) { 
+    baz_ptr.SetTouched();
+    return baz_ptr;
+  }
+}
+