Completion for java inner class names

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/JavaClassOrPackageScope.java

@@ -21,11 +21,7 @@ import com.intellij.psi.PsiClass;
 import com.intellij.psi.PsiModifier;
 import com.intellij.psi.PsiPackage;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
+import org.jetbrains.jet.lang.descriptors.*;
-import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
-import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
-import org.jetbrains.jet.lang.descriptors.NamespaceDescriptor;
-import org.jetbrains.jet.lang.descriptors.VariableDescriptor;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.JetScopeImpl;
@@ -82,8 +78,16 @@ public abstract class JavaClassOrPackageScope extends JetScopeImpl {
 
                 allDescriptors.addAll(semanticServices.getDescriptorResolver().resolveFieldGroup(resolverScopeData));
 
-                allDescriptors.addAll(semanticServices.getDescriptorResolver().resolveInnerClasses(
+                // TODO: Trying to hack the situation when we produce namespace descriptor for java class and still want to see inner classes
-                        resolverScopeData.classOrNamespaceDescriptor, resolverScopeData.psiClass, resolverScopeData.staticMembers));
+                if (getContainingDeclaration() instanceof JavaNamespaceDescriptor) {
+                    allDescriptors.addAll(semanticServices.getDescriptorResolver().resolveInnerClasses(
+                            resolverScopeData.classOrNamespaceDescriptor, resolverScopeData.psiClass, false));
+                }
+                else  {
+                    allDescriptors.addAll(semanticServices.getDescriptorResolver().resolveInnerClasses(
+                            resolverScopeData.classOrNamespaceDescriptor, resolverScopeData.psiClass,
+                            resolverScopeData.staticMembers));
+                }
             }
 
             if (resolverScopeData.psiPackage != null) {

idea/testData/completion/basic/multifile/JavaInnerClasses.java

@@ -0,0 +1,5 @@
+public final class R {
+    public static final class layout {
+        public static final int main=0x7f020000;
+    }
+}

idea/testData/completion/basic/multifile/JavaInnerClasses.kt

@@ -0,0 +1,5 @@
+fun main(args: Array<String>) {
+    println(R.<caret>)
+}
+
+// EXIST: layout

idea/tests/org/jetbrains/jet/completion/JetCompletionMultiTestBase.java

@@ -27,11 +27,12 @@ public abstract class JetCompletionMultiTestBase extends CompletionTestCase {
 
     /**
      * @param completionLevel {@see CompletionParameters.getInvocationCount()} javadoc
+     * @param fileNameList
      * @throws Exception
      */
-    protected void doFileTest(int completionLevel) {
+    protected void doFileTest(int completionLevel, String[] fileNameList) {
         try {
-            configureByFiles(null, getFileNameList());
+            configureByFiles(null, fileNameList);
             complete(completionLevel);
 
             final String fileText = getFile().getText();
@@ -49,7 +50,11 @@ public abstract class JetCompletionMultiTestBase extends CompletionTestCase {
         }
     }
 
+    protected void doFileTest(int completionLevel) {
+        doFileTest(completionLevel, getFileNameList());
+    }
+
     protected void doFileTest() {
-        doFileTest(1);
+        doFileTest(1, getFileNameList());
     }
 }

idea/tests/org/jetbrains/jet/completion/JetMultifileBasicCompletionTest.java

@@ -43,6 +43,11 @@ public class JetMultifileBasicCompletionTest extends JetCompletionMultiTestBase
         doFileTest();
     }
 
+    public void testJavaInnerClasses() throws Exception {
+        String fileName = getTestName(false);
+        doFileTest(1, new String[] {fileName + ".kt", fileName + ".java"});
+    }
+
     public void testNotImportedExtensionFunction() throws Exception {
         doFileTest();
     }