Filter enum synthetic methods for stub based classes

Fixed #KT-36095

compiler/frontend.java/src/org/jetbrains/kotlin/asJava/SyntheticElementUtils.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.asJava
+
+import com.intellij.psi.PsiMethod
+import com.intellij.psi.SyntheticElement
+import org.jetbrains.kotlin.resolve.DescriptorUtils
+
+fun isSyntheticValuesOrValueOfMethod(method: PsiMethod): Boolean {
+    if (method !is SyntheticElement) return false
+    return DescriptorUtils.ENUM_VALUE_OF.asString() == method.name || DescriptorUtils.ENUM_VALUES.asString() == method.name
+}

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/JavaClassImpl.kt

@@ -19,17 +19,15 @@ package org.jetbrains.kotlin.load.java.structure.impl
 import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.PsiClass
-import com.intellij.psi.PsiMethod
 import com.intellij.psi.PsiTypeParameter
-import com.intellij.psi.SyntheticElement
 import com.intellij.psi.search.SearchScope
 import org.jetbrains.kotlin.asJava.KtLightClassMarker
+import org.jetbrains.kotlin.asJava.isSyntheticValuesOrValueOfMethod
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.load.java.structure.*
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.KtPsiUtil
-import org.jetbrains.kotlin.resolve.DescriptorUtils
 
 class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass), VirtualFileBoundJavaClass, JavaAnnotationOwnerImpl, JavaModifierListOwnerImpl {
     init {
@@ -80,7 +78,7 @@ class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass)
             // Return type seems to be null for example for the 'clone' Groovy method generated by @AutoClone (see EA-73795)
             return methods(
                 psi.methods.filter { method ->
-                    !method.isConstructor && method.returnType != null && !isSyntheticValuesOrValueOfMethod(method)
+                    !method.isConstructor && method.returnType != null && !(isEnum && isSyntheticValuesOrValueOfMethod(method))
                 }
             ).distinct()
         }
@@ -124,12 +122,6 @@ class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass)
 
     override fun getAnnotationOwnerPsi() = psi.modifierList
 
-    private fun isSyntheticValuesOrValueOfMethod(method: PsiMethod): Boolean {
-        if (!isEnum) return false
-        if (method !is SyntheticElement) return false
-        return DescriptorUtils.ENUM_VALUE_OF.asString() == method.name || DescriptorUtils.ENUM_VALUES.asString() == method.name
-    }
-
     private fun assertNotLightClass() {
         val psiClass = psi
         if (psiClass !is KtLightClassMarker) return

compiler/light-classes/src/org/jetbrains/kotlin/asJava/builder/ClsWrapperStubPsiFactory.java

@@ -1,34 +1,23 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.asJava.builder;
 
 import com.intellij.openapi.util.Key;
-import com.intellij.openapi.util.UserDataHolder;
 import com.intellij.psi.*;
 import com.intellij.psi.impl.compiled.ClsClassImpl;
 import com.intellij.psi.impl.compiled.ClsEnumConstantImpl;
 import com.intellij.psi.impl.compiled.ClsFieldImpl;
-import com.intellij.psi.impl.compiled.ClsRepositoryPsiElement;
 import com.intellij.psi.impl.java.stubs.*;
 import com.intellij.psi.stubs.StubBase;
 import com.intellij.psi.stubs.StubElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import static org.jetbrains.kotlin.asJava.SyntheticElementUtilsKt.isSyntheticValuesOrValueOfMethod;
+
 public class ClsWrapperStubPsiFactory extends StubPsiFactory {
     public static final Key<LightElementOrigin> ORIGIN = Key.create("ORIGIN");
     public static final ClsWrapperStubPsiFactory INSTANCE = new ClsWrapperStubPsiFactory();
@@ -54,6 +43,30 @@ public class ClsWrapperStubPsiFactory extends StubPsiFactory {
             public PsiClass getSourceMirrorClass() {
                 return null;
             }
+
+            @NotNull
+            @Override
+            public PsiMethod[] getMethods() {
+                PsiMethod[] baseMethods = super.getMethods();
+                if (!isEnum()) return baseMethods;
+
+                int filteredArraySize = 0;
+                for (PsiMethod method : baseMethods) {
+                    if (!isSyntheticValuesOrValueOfMethod(method)) filteredArraySize++;
+                }
+
+                if (filteredArraySize == baseMethods.length) return baseMethods;
+
+                PsiMethod[] filteredMethods = new PsiMethod[filteredArraySize];
+                int index = 0;
+                for (PsiMethod method : baseMethods) {
+                    if (!isSyntheticValuesOrValueOfMethod(method)) {
+                        filteredMethods[index] = method;
+                        index++;
+                    }
+                }
+                return filteredMethods;
+            }
         };
     }