7 files changed, 90 insertions, 2 deletions
diff --git a/CHANGES.current b/CHANGES.current
index da631bc1d..22f074616 100644
--- a/CHANGES.current
+++ b/CHANGES.current
@@ -7,6 +7,10 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.0.1 (in progress)
 ===========================
 
+2019-07-09: IsaacPascual
+            [C#, Java] #1570 Fix name of generated C#/Java classes for %interface macros
+            in swiginterface.i when wrapping nested C++ classes.
+
 2019-07-05: wsfulton
             [Python] #1547 Whitespace fixes in Doxygen translated comments into pydoc comments
             for Sphinx compatibility.
diff --git a/Examples/test-suite/common.mk b/Examples/test-suite/common.mk
index eece29b00..742536201 100644
--- a/Examples/test-suite/common.mk
+++ b/Examples/test-suite/common.mk
@@ -324,6 +324,7 @@ CPP_TEST_CASES += \
 	nested_directors \
 	nested_comment \
 	nested_ignore \
+	nested_inheritance_interface \
 	nested_in_template \
 	nested_scope \
 	nested_template_base \
diff --git a/Examples/test-suite/csharp/nested_inheritance_interface_runme.cs b/Examples/test-suite/csharp/nested_inheritance_interface_runme.cs
new file mode 100644
index 000000000..810b7db6d
--- /dev/null
+++ b/Examples/test-suite/csharp/nested_inheritance_interface_runme.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using nested_inheritance_interfaceNamespace;
+
+public class nested_inheritance_interface_runme {
+
+  static string SortArrayToString(string[] types) {
+    Array.Sort<string>(types);
+    return string.Join(" ", types);
+  }
+
+  static string SortArrayToString(Type[] types) {
+    List<string> stypes = new List<string>();
+    foreach (Type t in types)
+      stypes.Add(t.Name);
+    return SortArrayToString(stypes.ToArray());
+  }
+
+  private static void takeIA(IASwigInterface ia) {
+  }
+
+  public static void Main() {
+    Type[] BNInterfaces = typeof(B.N).GetInterfaces();
+    string expectedInterfacesString = "IASwigInterface IDisposable";
+    string actualInterfacesString = SortArrayToString(BNInterfaces);
+    if (expectedInterfacesString != actualInterfacesString)
+      throw new Exception("Expected interfaces for " + typeof(B.N).Name + ": \n" + expectedInterfacesString + "\n" + "Actual interfaces: \n" + actualInterfacesString);
+
+    if (!typeof(IASwigInterface).IsInterface)
+      throw new Exception(typeof(IASwigInterface).Name + " should be an interface but is not");
+
+    // overloaded methods check
+    B.N d = new B.N();
+    takeIA(d);
+  }
+}
diff --git a/Examples/test-suite/java/nested_inheritance_interface_runme.java b/Examples/test-suite/java/nested_inheritance_interface_runme.java
new file mode 100644
index 000000000..8436ec294
--- /dev/null
+++ b/Examples/test-suite/java/nested_inheritance_interface_runme.java
@@ -0,0 +1,32 @@
+import nested_inheritance_interface.*;
+import java.util.Arrays;
+
+public class nested_inheritance_interface_runme {
+
+  static {
+    try {
+      System.loadLibrary("nested_inheritance_interface");
+    } 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);
+    }
+  }
+
+  private static void takeIA(IASwigInterface ia) {
+  }
+
+  public static void main(String argv[]) {
+	Class[] BNInterfaces = B.N.class.getInterfaces();
+    String expectedInterfacesString = "[interface nested_inheritance_interface.IASwigInterface]";
+    String actualInterfacesString = Arrays.toString(BNInterfaces);
+    if (!expectedInterfacesString.equals(actualInterfacesString))
+      throw new RuntimeException("Expected interfaces for " + B.N.class.getName() + ": \n" + expectedInterfacesString + "\n" + "Actual interfaces: \n" + actualInterfacesString);
+
+    if (!IASwigInterface.class.isInterface())
+      throw new RuntimeException(IASwigInterface.class.getName() + " should be an interface but is not");
+
+    // overloaded methods check
+    B.N d = new B.N();
+    takeIA(d);
+  }
+}
diff --git a/Examples/test-suite/nested_inheritance_interface.i b/Examples/test-suite/nested_inheritance_interface.i
new file mode 100644
index 000000000..2d144ff72
--- /dev/null
+++ b/Examples/test-suite/nested_inheritance_interface.i
@@ -0,0 +1,15 @@
+%module  nested_inheritance_interface
+
+%warnfilter(SWIGWARN_RUBY_MULTIPLE_INHERITANCE,
+	    SWIGWARN_D_MULTIPLE_INHERITANCE,
+	    SWIGWARN_PHP_MULTIPLE_INHERITANCE); /* languages not supporting multiple inheritance or %interface */
+
+#if defined(SWIGJAVA) || defined(SWIGCSHARP)
+%include "swiginterface.i"
+%interface(IA)
+#endif
+
+%inline %{
+struct IA {};
+struct B { struct N : IA {}; };
+%}
diff --git a/Source/Modules/csharp.cxx b/Source/Modules/csharp.cxx
index ff73c3075..76ec6a4fb 100644
--- a/Source/Modules/csharp.cxx
+++ b/Source/Modules/csharp.cxx
@@ -1732,7 +1732,7 @@ public:
       Replaceall(cptr_method_name, ".", "_");
       Replaceall(cptr_method_name, "$interfacename", interface_name);
 
-      String *upcast_method_name = Swig_name_member(getNSpace(), proxy_class_name, cptr_method_name);
+      String *upcast_method_name = Swig_name_member(getNSpace(), getClassPrefix(), cptr_method_name);
       upcastsCode(smart, upcast_method_name, c_classname, c_baseclass);
 
       Delete(upcast_method_name);
diff --git a/Source/Modules/java.cxx b/Source/Modules/java.cxx
index cb41781dd..259f23f8e 100644
--- a/Source/Modules/java.cxx
+++ b/Source/Modules/java.cxx
@@ -1876,7 +1876,7 @@ public:
       Replaceall(cptr_method_name, ".", "_");
       Replaceall(cptr_method_name, "$interfacename", interface_name);
 
-      String *upcast_method_name = Swig_name_member(getNSpace(), proxy_class_name, cptr_method_name);
+      String *upcast_method_name = Swig_name_member(getNSpace(), getClassPrefix(), cptr_method_name);
       upcastsCode(smart, upcast_method_name, c_classname, c_baseclass);
       Delete(upcast_method_name);
       Delete(cptr_method_name);