Supported renaming default objects with default names.

compiler/frontend/src/org/jetbrains/kotlin/psi/JetObjectDeclaration.java

@@ -76,8 +76,16 @@ public class JetObjectDeclaration extends JetNamedDeclarationStub<KotlinObjectSt
 
     @Override
     public PsiElement setName(@NonNls @NotNull String name) throws IncorrectOperationException {
-        JetObjectDeclarationName nameAsDeclaration = getNameAsDeclaration();
-        return nameAsDeclaration == null ? null : nameAsDeclaration.setName(name);
+        JetObjectDeclarationName declarationName = getNameAsDeclaration();
+        if (declarationName == null) {
+            JetPsiFactory psiFactory = new JetPsiFactory(getProject());
+            PsiElement result = addAfter(psiFactory.createObjectDeclarationName(name), getObjectKeyword());
+            addAfter(psiFactory.createWhiteSpace(), getObjectKeyword());
+
+            return result;
+        } else {
+            return declarationName.setName(name);
+        }
     }
 
     @Override

compiler/frontend/src/org/jetbrains/kotlin/psi/JetPsiFactory.kt

@@ -195,6 +195,10 @@ public class JetPsiFactory(private val project: Project) {
         return createProperty(name, null, false, name).getInitializer() as JetSimpleNameExpression
     }
 
+    public fun createObjectDeclarationName(name: String): JetObjectDeclarationName {
+        return createDeclaration<JetObjectDeclaration>("object $name").getNameAsDeclaration()!!
+    }
+
     public fun createIdentifier(name: String): PsiElement {
         return createSimpleName(name).getIdentifier()!!
     }

idea/testData/refactoring/rename/defaultObjectWithDefaultName/after/JavaUsage.java

@@ -0,0 +1,8 @@
+class JavaUsage {
+    public static void main(String[] args) {
+        System.out.println(Foo.CONST);
+        Foo.s();
+        Foo.Baz.f();
+        Foo foo = new Foo(); // not usage of default object
+    }
+}

idea/testData/refactoring/rename/defaultObjectWithDefaultName/after/toBeRenamed.kt

@@ -0,0 +1,11 @@
+class Foo {
+    default object Baz {
+        fun f() {
+        }
+
+        platformStatic fun s() {
+        }
+
+        val CONST = 42
+    }
+}

idea/testData/refactoring/rename/defaultObjectWithDefaultName/after/usage.kt

@@ -0,0 +1,8 @@
+fun main(args: Array<String>) {
+    // class object usages
+    Foo.f()
+    val x = Foo
+
+    Foo.Baz.f()
+    val xx = Foo.Baz
+}

idea/testData/refactoring/rename/defaultObjectWithDefaultName/before/JavaUsage.java

@@ -0,0 +1,8 @@
+class JavaUsage {
+    public static void main(String[] args) {
+        System.out.println(Foo.CONST);
+        Foo.s();
+        Foo.Default.f();
+        Foo foo = new Foo(); // not usage of default object
+    }
+}

idea/testData/refactoring/rename/defaultObjectWithDefaultName/before/toBeRenamed.kt

@@ -0,0 +1,11 @@
+class Foo {
+    default object {
+        fun f() {
+        }
+
+        platformStatic fun s() {
+        }
+
+        val CONST = 42
+    }
+}

idea/testData/refactoring/rename/defaultObjectWithDefaultName/before/usage.kt

@@ -0,0 +1,8 @@
+fun main(args: Array<String>) {
+    // class object usages
+    Foo.f()
+    val x = Foo
+
+    Foo.Default.f()
+    val xx = Foo.Default
+}

idea/testData/refactoring/rename/defaultObjectWithDefaultName/defaultObject.test

@@ -0,0 +1,7 @@
+{
+  "type": "KOTLIN_CLASS",
+  "classId": "/Foo.Default",
+  "oldName": "Default",
+  "newName": "Baz",
+  "mainFile": "toBeRenamed.kt"
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/rename/RenameTestGenerated.java

@@ -42,6 +42,12 @@ public class RenameTestGenerated extends AbstractRenameTest {
         doTest(fileName);
     }
 
+    @TestMetadata("defaultObjectWithDefaultName/defaultObject.test")
+    public void testDefaultObjectWithDefaultName_DefaultObject() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/refactoring/rename/defaultObjectWithDefaultName/defaultObject.test");
+        doTest(fileName);
+    }
+
     @TestMetadata("renameCompareTo/compareTo.test")
     public void testRenameCompareTo_CompareTo() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/testData/refactoring/rename/renameCompareTo/compareTo.test");