Java to Kotlin converter: converting usages of Kotlin class object members

j2k/src/org/jetbrains/jet/j2k/visitors/ExpressionVisitor.kt

@@ -32,6 +32,7 @@ import org.jetbrains.jet.lang.psi.JetClassOrObject
 import org.jetbrains.jet.lang.psi.psiUtil.getParentByType
 import org.jetbrains.jet.lang.psi.psiUtil.isExtensionDeclaration
 import org.jetbrains.jet.lang.psi.JetPropertyAccessor
+import com.intellij.psi.impl.light.LightField
 
 open class ExpressionVisitor(protected val converter: Converter,
                              private val usageReplacementMap: Map<PsiVariable, String> = mapOf()) : JavaElementVisitor() {
@@ -292,7 +293,16 @@ open class ExpressionVisitor(protected val converter: Converter,
         else if (qualifier != null && qualifier.getType() is PsiArrayType && referencedName == "length") {
             identifier = Identifier("size", isNullable)
         }
-        else if (qualifier == null) {
+        else if (qualifier != null) {
+            if (referencedName == "object$") {
+                val target = expression.getReference()?.resolve()
+                if (target is LightField) { //TODO: should be KotlinLightField with check of origin here, see KT-5188
+                    result = converter.convertExpression(qualifier)
+                    return
+                }
+            }
+        }
+        else {
             val target = expression.getReference()?.resolve()
 
             if (target is PsiClass) {

j2k/tests/test/org/jetbrains/jet/j2k/test/JavaToKotlinConverterTestGenerated.java

@@ -1556,6 +1556,11 @@ public class JavaToKotlinConverterTestGenerated extends AbstractJavaToKotlinConv
             JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("j2k/tests/testData/ast/kotlinApiAccess"), Pattern.compile("^(.+)\\.java$"), true);
         }
         
+        @TestMetadata("ClassObjectMembers.java")
+        public void testClassObjectMembers() throws Exception {
+            doTest("j2k/tests/testData/ast/kotlinApiAccess/ClassObjectMembers.java");
+        }
+        
         @TestMetadata("ExtensionFunction.java")
         public void testExtensionFunction() throws Exception {
             doTest("j2k/tests/testData/ast/kotlinApiAccess/ExtensionFunction.java");

j2k/tests/testData/KotlinApi.kt

@@ -2,6 +2,14 @@ package kotlinApi
 
 public open class KotlinClass {
     public var property: String = ""
+
+    class object {
+        public fun statucFun(p: Int): Int = p
+        public var staticVar: Int = 1
+        public var staticProperty: Int
+          get() = 1
+          set(value) {}
+    }
 }
 
 public fun globalFunction(s: String): String = s

j2k/tests/testData/ast/kotlinApiAccess/ClassObjectMembers.java

@@ -0,0 +1,10 @@
+//file
+import kotlinApi.KotlinClass;
+
+class C {
+    int foo() {
+        KotlinClass.staticVar = KotlinClass.staticVar * 2;
+        KotlinClass.object$.setStaticProperty(KotlinClass.object$.getStaticVar() + KotlinClass.object$.getStaticProperty());
+        return KotlinClass.object$.statucFun(1);
+    }
+}

j2k/tests/testData/ast/kotlinApiAccess/ClassObjectMembers.kt

@@ -0,0 +1,9 @@
+import kotlinApi.KotlinClass
+
+class C() {
+    fun foo(): Int {
+        KotlinClass.staticVar = KotlinClass.staticVar * 2
+        KotlinClass.staticProperty = KotlinClass.staticVar + KotlinClass.staticProperty
+        return KotlinClass.statucFun(1)
+    }
+}