Extract Class: Implement 'Extract Interface' refactoring

#KT-11017 Fixed

ChangeLog.md

@@ -144,6 +144,7 @@ These artifacts include extensions for the types available in the latter JDKs, s
 
 - [`KT-13155`](https://youtrack.jetbrains.com/issue/KT-13155) Implement "Introduce Type Parameter" refactoring
 - [`KT-11017`](https://youtrack.jetbrains.com/issue/KT-11017) Implement "Extract Superclass" refactoring
+- [`KT-11017`](https://youtrack.jetbrains.com/issue/KT-11017) Implement "Extract Interface" refactoring
 
 #### Android Lint
 

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -799,6 +799,7 @@ fun main(args: Array<String>) {
             model("refactoring/introduceTypeParameter", pattern = KT_OR_KTS, testMethod = "doIntroduceTypeParameterTest")
             model("refactoring/introduceTypeAlias", pattern = KT_OR_KTS, testMethod = "doIntroduceTypeAliasTest")
             model("refactoring/extractSuperclass", pattern = KT_OR_KTS, testMethod = "doExtractSuperclassTest")
+            model("refactoring/extractInterface", pattern = KT_OR_KTS, testMethod = "doExtractInterfaceTest")
         }
 
         testClass<AbstractPullUpTest>() {

idea/src/org/jetbrains/kotlin/idea/refactoring/KotlinRefactoringSupportProvider.kt

@@ -22,6 +22,7 @@ import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiNameIdentifierOwner
 import com.intellij.refactoring.RefactoringActionHandler
 import org.jetbrains.kotlin.idea.refactoring.changeSignature.KotlinChangeSignatureHandler
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.KotlinExtractInterfaceHandler
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractFunction.ExtractKotlinFunctionHandler
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.KotlinExtractSuperclassHandler
 import org.jetbrains.kotlin.idea.refactoring.introduce.introduceParameter.KotlinIntroduceLambdaParameterHandler
@@ -81,6 +82,8 @@ class KotlinRefactoringSupportProvider : RefactoringSupportProvider() {
     override fun getPushDownHandler() = KotlinPushDownHandler()
 
     override fun getExtractSuperClassHandler() = KotlinExtractSuperclassHandler
+
+    override fun getExtractInterfaceHandler() = KotlinExtractInterfaceHandler
 }
 
 class KotlinVetoRenameCondition: Condition<PsiElement> {

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/ExtractSuperRefactoring.kt

@@ -68,22 +68,24 @@ import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 import org.jetbrains.kotlin.resolve.scopes.utils.findClassifier
 import java.util.*
 
-data class ExtractSuperclassInfo(
+data class ExtractSuperInfo(
         val originalClass: KtClassOrObject,
         val memberInfos: Collection<KotlinMemberInfo>,
         val targetParent: PsiElement,
         val targetFileName: String,
         val newClassName: String,
+        val isInterface: Boolean,
         val docPolicy: DocCommentPolicy<*>
 )
 
-class ExtractSuperclassRefactoring(
-        private var extractInfo: ExtractSuperclassInfo
+class ExtractSuperRefactoring(
+        private var extractInfo: ExtractSuperInfo
 ) {
     companion object {
         private fun getElementsToMove(
                 memberInfos: Collection<KotlinMemberInfo>,
-                originalClass: KtClassOrObject
+                originalClass: KtClassOrObject,
+                isExtractInterface: Boolean
         ): Map<KtElement, KotlinMemberInfo?> {
             val project = originalClass.project
             val elementsToMove = LinkedHashMap<KtElement, KotlinMemberInfo?>()
@@ -106,7 +108,7 @@ class ExtractSuperclassRefactoring(
                                         ?: continue
                         val superClassDescriptor = superType.constructor.declarationDescriptor ?: continue
                         val superClass = DescriptorToSourceUtilsIde.getAnyDeclaration(project, superClassDescriptor) as? KtClass ?: continue
-                        if (!superClass.isInterface() || superClass in superInterfacesToMove) {
+                        if ((!isExtractInterface && !superClass.isInterface()) || superClass in superInterfacesToMove) {
                             elementsToMove[superTypeListEntry] = null
                         }
                     }
@@ -119,7 +121,8 @@ class ExtractSuperclassRefactoring(
                 originalClass: KtClassOrObject,
                 memberInfos: List<KotlinMemberInfo>,
                 targetParent: PsiElement,
-                newClassName: String
+                newClassName: String,
+                isExtractInterface: Boolean
         ): MultiMap<PsiElement, String> {
             val conflicts = MultiMap<PsiElement, String>()
 
@@ -133,7 +136,7 @@ class ExtractSuperclassRefactoring(
                         ?.let { conflicts.putValue(it, "Class $newClassName already exists in the target scope") }
             }
 
-            val elementsToMove = getElementsToMove(memberInfos, originalClass).keys
+            val elementsToMove = getElementsToMove(memberInfos, originalClass, isExtractInterface).keys
 
             val moveTarget = if (targetParent is PsiDirectory) {
                 val targetPackage = targetParent.getPackage() ?: return conflicts
@@ -192,7 +195,7 @@ class ExtractSuperclassRefactoring(
                 collectTypeParameters(refTarget)
             }
         }
-        getElementsToMove(extractInfo.memberInfos, extractInfo.originalClass)
+        getElementsToMove(extractInfo.memberInfos, extractInfo.originalClass, extractInfo.isInterface)
                 .asSequence()
                 .flatMap {
                     val (element, info) = it
@@ -206,18 +209,22 @@ class ExtractSuperclassRefactoring(
         val newClassName = extractInfo.newClassName
         val originalClass = extractInfo.originalClass
 
+        val kind = if (extractInfo.isInterface) "interface" else "class"
+        val prototype = psiFactory.createClass("$kind $newClassName")
         val newClass = if (targetParent is PsiDirectory) {
             val template = FileTemplateManager.getInstance(project).getInternalTemplate("Kotlin File")
             val newFile = NewKotlinFileAction.createFileFromTemplate(extractInfo.targetFileName, template, targetParent) as KtFile
-            newFile.add(psiFactory.createClass("class $newClassName")) as KtClass
+            newFile.add(prototype) as KtClass
         }
         else {
             val targetSibling = originalClass.parentsWithSelf.first { it.parent == targetParent }
-            insertDeclaration(psiFactory.createClass("class $newClassName"), targetSibling)
+            insertDeclaration(prototype, targetSibling)
         }
 
         val shouldBeAbstract = extractInfo.memberInfos.any { it.isToAbstract }
-        newClass.addModifier(if (shouldBeAbstract) KtTokens.ABSTRACT_KEYWORD else KtTokens.OPEN_KEYWORD)
+        if (!extractInfo.isInterface) {
+            newClass.addModifier(if (shouldBeAbstract) KtTokens.ABSTRACT_KEYWORD else KtTokens.OPEN_KEYWORD)
+        }
 
         if (typeParameters.isNotEmpty()) {
             val typeParameterListText = typeParameters.sortedBy { it.startOffset }.map { it.text }.joinToString(prefix = "<", postfix = ">")
@@ -235,10 +242,11 @@ class ExtractSuperclassRefactoring(
                 append(typeParameters.sortedBy { it.startOffset }.map { it.name }.joinToString(prefix = "<", postfix = ">"))
             }
         }
-        val needSuperCall = superClassEntry is KtSuperTypeCallEntry
+        val needSuperCall = !extractInfo.isInterface
+                            && (superClassEntry is KtSuperTypeCallEntry
                             || originalClass.hasPrimaryConstructor()
-                            || originalClass.getSecondaryConstructors().isEmpty()
-        val newSuperTypeCallEntry = if (needSuperCall) {
+                            || originalClass.getSecondaryConstructors().isEmpty())
+        val newSuperTypeListEntry = if (needSuperCall) {
             psiFactory.createSuperTypeCallEntry("$superTypeText()")
         }
         else {
@@ -253,10 +261,10 @@ class ExtractSuperclassRefactoring(
             }
             else superClassEntry
             newClass.addSuperTypeListEntry(superClassEntryToAdd)
-            ShortenReferences.DEFAULT.process(superClassEntry.replaced(newSuperTypeCallEntry))
+            ShortenReferences.DEFAULT.process(superClassEntry.replaced(newSuperTypeListEntry))
         }
         else {
-            ShortenReferences.DEFAULT.process(originalClass.addSuperTypeListEntry(newSuperTypeCallEntry))
+            ShortenReferences.DEFAULT.process(originalClass.addSuperTypeListEntry(newSuperTypeListEntry))
         }
 
         ShortenReferences.DEFAULT.process(newClass)
@@ -267,15 +275,17 @@ class ExtractSuperclassRefactoring(
     fun performRefactoring() {
         val originalClass = extractInfo.originalClass
 
-        KotlinExtractSuperclassHandler.getErrorMessage(originalClass)?.let {
-            throw CommonRefactoringUtil.RefactoringErrorHintException(it)
-        }
+        val handler = if (extractInfo.isInterface) KotlinExtractInterfaceHandler else KotlinExtractSuperclassHandler
+        handler.getErrorMessage(originalClass)?.let { throw CommonRefactoringUtil.RefactoringErrorHintException(it) }
 
-        val originalClassDescriptor = originalClass.resolveToDescriptor() as ClassDescriptor
-        val superClassDescriptor = originalClassDescriptor.getSuperClassNotAny()
-        val superClassEntry = originalClass.getSuperTypeListEntries().firstOrNull {
-            bindingContext[BindingContext.TYPE, it.typeReference]?.constructor?.declarationDescriptor == superClassDescriptor
+        val superClassEntry = if (!extractInfo.isInterface) {
+            val originalClassDescriptor = originalClass.resolveToDescriptor() as ClassDescriptor
+            val superClassDescriptor = originalClassDescriptor.getSuperClassNotAny()
+            originalClass.getSuperTypeListEntries().firstOrNull {
+                bindingContext[BindingContext.TYPE, it.typeReference]?.constructor?.declarationDescriptor == superClassDescriptor
+            }
         }
+        else null
 
         project.runSynchronouslyWithProgress(RefactoringBundle.message("progress.text"), true) { runReadAction { analyzeContext() } }
 

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/KotlinExtractInterfaceHandler.kt

@@ -0,0 +1,45 @@
+/*
+ * 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.
+ */
+
+package org.jetbrains.kotlin.idea.refactoring.introduce.extractClass
+
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiElement
+import com.intellij.refactoring.util.CommonRefactoringUtil
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ui.KotlinExtractInterfaceDialog
+import org.jetbrains.kotlin.psi.KtClass
+import org.jetbrains.kotlin.psi.KtClassOrObject
+
+object KotlinExtractInterfaceHandler : KotlinExtractSuperHandlerBase(true) {
+    val REFACTORING_NAME = "Extract Interface"
+
+    override fun getErrorMessage(klass: KtClassOrObject): String? {
+        if (klass is KtClass && klass.isAnnotation()) return "Interface cannot be extracted from an annotation class"
+        return null
+    }
+
+    override fun doInvoke(klass: KtClassOrObject, targetParent: PsiElement, project: Project, editor: Editor?) {
+        if (!CommonRefactoringUtil.checkReadOnlyStatus(project, klass)) return
+
+        KotlinExtractInterfaceDialog(
+                originalClass = klass,
+                targetParent = targetParent,
+                conflictChecker = { checkConflicts(klass, it) },
+                refactoring = { ExtractSuperRefactoring(it).performRefactoring() }
+        ).show()
+    }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/KotlinExtractSuperHandlerBase.kt

@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+package org.jetbrains.kotlin.idea.refactoring.introduce.extractClass
+
+import com.intellij.openapi.actionSystem.CommonDataKeys
+import com.intellij.openapi.actionSystem.DataContext
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.ScrollType
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiFile
+import com.intellij.psi.util.PsiTreeUtil
+import com.intellij.refactoring.RefactoringActionHandler
+import com.intellij.refactoring.extractSuperclass.ExtractSuperClassUtil
+import com.intellij.refactoring.lang.ElementsHandler
+import org.jetbrains.kotlin.idea.refactoring.SeparateFileWrapper
+import org.jetbrains.kotlin.idea.refactoring.chooseContainerElementIfNecessary
+import org.jetbrains.kotlin.idea.refactoring.getExtractionContainers
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ui.KotlinExtractSuperDialogBase
+import org.jetbrains.kotlin.psi.KtClassOrObject
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
+
+abstract class KotlinExtractSuperHandlerBase(private val isExtractInterface: Boolean) : RefactoringActionHandler, ElementsHandler {
+    override fun isEnabledOnElements(elements: Array<out PsiElement>) = elements.singleOrNull() is KtClassOrObject
+
+    override fun invoke(project: Project, editor: Editor, file: PsiFile, dataContext: DataContext?) {
+        val offset = editor.caretModel.offset
+        val element = file.findElementAt(offset) ?: return
+        val klass = element.getNonStrictParentOfType<KtClassOrObject>() ?: return
+        editor.scrollingModel.scrollToCaret(ScrollType.MAKE_VISIBLE)
+        selectElements(klass, project, editor)
+    }
+
+    override fun invoke(project: Project, elements: Array<out PsiElement>, dataContext: DataContext?) {
+        if (dataContext == null) return
+        val editor = CommonDataKeys.EDITOR.getData(dataContext)
+        val klass = PsiTreeUtil.findCommonParent(*elements)?.getNonStrictParentOfType<KtClassOrObject>() ?: return
+        selectElements(klass, project, editor)
+    }
+
+    fun selectElements(klass: KtClassOrObject, project: Project, editor: Editor?) {
+        val containers = klass.getExtractionContainers(strict = true, includeAll = true) + SeparateFileWrapper(klass.manager)
+
+        if (editor == null) return doInvoke(klass, containers.first(), project, editor)
+
+        chooseContainerElementIfNecessary(
+                containers,
+                editor,
+                if (containers.first() is KtFile) "Select target file" else "Select target code block / file",
+                true,
+                { it },
+                { doInvoke(klass, if (it is SeparateFileWrapper) klass.containingFile.parent!! else it, project, editor) }
+        )
+    }
+
+    protected fun checkConflicts(originalClass: KtClassOrObject, dialog: KotlinExtractSuperDialogBase): Boolean {
+        val conflicts = ExtractSuperRefactoring.collectConflicts(
+                originalClass,
+                dialog.selectedMembers,
+                dialog.selectedTargetParent,
+                dialog.extractedSuperName,
+                isExtractInterface
+        )
+        return ExtractSuperClassUtil.showConflicts(dialog, conflicts, originalClass.project)
+    }
+
+    internal abstract fun getErrorMessage(klass: KtClassOrObject): String?
+
+    protected abstract fun doInvoke(klass: KtClassOrObject, targetParent: PsiElement, project: Project, editor: Editor?)
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/KotlinExtractSuperclassHandler.kt

@@ -16,65 +16,20 @@
 
 package org.jetbrains.kotlin.idea.refactoring.introduce.extractClass
 
-import com.intellij.openapi.actionSystem.CommonDataKeys
-import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.editor.Editor
-import com.intellij.openapi.editor.ScrollType
 import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiElement
-import com.intellij.psi.PsiFile
-import com.intellij.psi.util.PsiTreeUtil
 import com.intellij.refactoring.HelpID
-import com.intellij.refactoring.RefactoringActionHandler
 import com.intellij.refactoring.RefactoringBundle
-import com.intellij.refactoring.extractSuperclass.ExtractSuperClassUtil
-import com.intellij.refactoring.lang.ElementsHandler
 import com.intellij.refactoring.util.CommonRefactoringUtil
-import org.jetbrains.kotlin.idea.refactoring.SeparateFileWrapper
-import org.jetbrains.kotlin.idea.refactoring.chooseContainerElementIfNecessary
-import org.jetbrains.kotlin.idea.refactoring.getExtractionContainers
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ui.KotlinExtractSuperclassDialog
 import org.jetbrains.kotlin.psi.KtClass
 import org.jetbrains.kotlin.psi.KtClassOrObject
-import org.jetbrains.kotlin.psi.KtFile
-import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
 
-object KotlinExtractSuperclassHandler : RefactoringActionHandler, ElementsHandler {
+object KotlinExtractSuperclassHandler : KotlinExtractSuperHandlerBase(false) {
     val REFACTORING_NAME = "Extract Superclass"
 
-    override fun isEnabledOnElements(elements: Array<out PsiElement>) = elements.singleOrNull() is KtClassOrObject
-
-    override fun invoke(project: Project, editor: Editor, file: PsiFile, dataContext: DataContext?) {
-        val offset = editor.caretModel.offset
-        val element = file.findElementAt(offset) ?: return
-        val klass = element.getNonStrictParentOfType<KtClassOrObject>() ?: return
-        editor.scrollingModel.scrollToCaret(ScrollType.MAKE_VISIBLE)
-        selectElements(klass, project, editor)
-    }
-
-    override fun invoke(project: Project, elements: Array<out PsiElement>, dataContext: DataContext?) {
-        if (dataContext == null) return
-        val editor = CommonDataKeys.EDITOR.getData(dataContext)
-        val klass = PsiTreeUtil.findCommonParent(*elements)?.getNonStrictParentOfType<KtClassOrObject>() ?: return
-        selectElements(klass, project, editor)
-    }
-
-    fun selectElements(klass: KtClassOrObject, project: Project, editor: Editor?) {
-        val containers = klass.getExtractionContainers(strict = true, includeAll = true) + SeparateFileWrapper(klass.manager)
-
-        if (editor == null) return doInvoke(klass, containers.first(), project, editor)
-
-        chooseContainerElementIfNecessary(
-                containers,
-                editor,
-                if (containers.first() is KtFile) "Select target file" else "Select target code block / file",
-                true,
-                { it },
-                { doInvoke(klass, it, project, editor) }
-        )
-    }
-
-    fun getErrorMessage(klass: KtClassOrObject): String? {
+    override fun getErrorMessage(klass: KtClassOrObject): String? {
         if (klass is KtClass) {
             if (klass.isInterface()) return RefactoringBundle.message("superclass.cannot.be.extracted.from.an.interface")
             if (klass.isEnum()) return RefactoringBundle.message("superclass.cannot.be.extracted.from.an.enum")
@@ -83,30 +38,18 @@ object KotlinExtractSuperclassHandler : RefactoringActionHandler, ElementsHandle
         return null
     }
 
-    private fun checkConflicts(originalClass: KtClassOrObject, dialog: KotlinExtractSuperclassDialog): Boolean {
-        val conflicts = ExtractSuperclassRefactoring.collectConflicts(
-                originalClass,
-                dialog.selectedMembers,
-                dialog.selectedTargetParent,
-                dialog.extractedSuperName
-        )
-        return ExtractSuperClassUtil.showConflicts(dialog, conflicts, originalClass.project)
-    }
-
-    private fun doInvoke(klass: KtClassOrObject, container: PsiElement, project: Project, editor: Editor?) {
+    override fun doInvoke(klass: KtClassOrObject, targetParent: PsiElement, project: Project, editor: Editor?) {
         if (!CommonRefactoringUtil.checkReadOnlyStatus(project, klass)) return
 
         getErrorMessage(klass)?.let {
             CommonRefactoringUtil.showErrorHint(project, editor, RefactoringBundle.getCannotRefactorMessage(it), REFACTORING_NAME, HelpID.EXTRACT_SUPERCLASS)
         }
 
-        val targetParent = (if (container is SeparateFileWrapper) klass.containingFile.parent else container) ?: return
-
         KotlinExtractSuperclassDialog(
                 originalClass = klass,
                 targetParent = targetParent,
                 conflictChecker = { checkConflicts(klass, it) },
-                refactoring = { ExtractSuperclassRefactoring(it).performRefactoring() }
+                refactoring = { ExtractSuperRefactoring(it).performRefactoring() }
         ).show()
     }
 }

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/ui/KotlinExtractInterfaceDialog.kt

@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+package org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ui
+
+import com.intellij.psi.PsiElement
+import com.intellij.refactoring.HelpID
+import com.intellij.refactoring.JavaRefactoringSettings
+import com.intellij.refactoring.RefactoringBundle
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperInfo
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.KotlinExtractInterfaceHandler
+import org.jetbrains.kotlin.idea.refactoring.memberInfo.KotlinMemberInfo
+import org.jetbrains.kotlin.idea.refactoring.memberInfo.extractClassMembers
+import org.jetbrains.kotlin.idea.refactoring.pullUp.mustBeAbstractInInterface
+import org.jetbrains.kotlin.lexer.KtTokens
+import org.jetbrains.kotlin.psi.KtClass
+import org.jetbrains.kotlin.psi.KtClassOrObject
+import org.jetbrains.kotlin.psi.KtNamedFunction
+import org.jetbrains.kotlin.psi.KtProperty
+
+class KotlinExtractInterfaceDialog(
+        originalClass: KtClassOrObject,
+        targetParent: PsiElement,
+        conflictChecker: (KotlinExtractSuperDialogBase) -> Boolean,
+        refactoring: (ExtractSuperInfo) -> Unit
+) : KotlinExtractSuperDialogBase(originalClass, targetParent, conflictChecker, true, KotlinExtractInterfaceHandler.REFACTORING_NAME, refactoring) {
+    companion object {
+        private val DESTINATION_PACKAGE_RECENT_KEY = "KotlinExtractInterfaceDialog.RECENT_KEYS"
+    }
+
+    init {
+        init()
+    }
+
+    override fun createMemberInfoModel(): MemberInfoModelBase {
+        val extractableMemberInfos = extractClassMembers(originalClass).filterNot {
+            val member = it.member
+            member is KtClass && member.hasModifier(KtTokens.INNER_KEYWORD)
+        }
+        extractableMemberInfos.forEach { it.isToAbstract = true }
+        return object : MemberInfoModelBase(extractableMemberInfos) {
+            override fun isAbstractEnabled(memberInfo: KotlinMemberInfo): Boolean {
+                val member = memberInfo.member
+                return member is KtNamedFunction || (member is KtProperty && !member.mustBeAbstractInInterface())
+            }
+
+            override fun isAbstractWhenDisabled(member: KotlinMemberInfo) = member.member is KtProperty
+        }
+    }
+
+    override fun getDestinationPackageRecentKey() = DESTINATION_PACKAGE_RECENT_KEY
+
+    override fun getClassNameLabelText() = RefactoringBundle.message("interface.name.prompt")!!
+
+    override fun getPackageNameLabelText() = RefactoringBundle.message("package.for.new.interface")!!
+
+    override fun getEntityName() = RefactoringBundle.message("extractSuperInterface.interface")!!
+
+    override fun getTopLabelText() = RefactoringBundle.message("extract.interface.from")!!
+
+    override fun getDocCommentPolicySetting() = JavaRefactoringSettings.getInstance().EXTRACT_INTERFACE_JAVADOC
+
+    override fun setDocCommentPolicySetting(policy: Int) {
+        JavaRefactoringSettings.getInstance().EXTRACT_INTERFACE_JAVADOC = policy
+    }
+
+    override fun getExtractedSuperNameNotSpecifiedMessage() = RefactoringBundle.message("no.interface.name.specified")!!
+
+    override fun getHelpId() = HelpID.EXTRACT_INTERFACE
+
+    override fun createExtractedSuperNameField() = super.createExtractedSuperNameField()!!.apply { text = "I${originalClass.name}" }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/ui/KotlinExtractSuperDialogBase.kt

@@ -0,0 +1,144 @@
+/*
+ * 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.
+ */
+
+package org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ui
+
+import com.intellij.psi.PsiComment
+import com.intellij.psi.PsiDirectory
+import com.intellij.psi.PsiElement
+import com.intellij.refactoring.RefactoringBundle
+import com.intellij.refactoring.classMembers.AbstractMemberInfoModel
+import com.intellij.refactoring.classMembers.MemberInfoChange
+import com.intellij.refactoring.extractSuperclass.JavaExtractSuperBaseDialog
+import com.intellij.refactoring.util.DocCommentPolicy
+import com.intellij.refactoring.util.RefactoringMessageUtil
+import org.jetbrains.kotlin.asJava.toLightClass
+import org.jetbrains.kotlin.asJava.unwrapped
+import org.jetbrains.kotlin.idea.KotlinFileType
+import org.jetbrains.kotlin.idea.core.KotlinNameSuggester
+import org.jetbrains.kotlin.idea.core.quoteIfNeeded
+import org.jetbrains.kotlin.idea.core.unquote
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperInfo
+import org.jetbrains.kotlin.idea.refactoring.memberInfo.KotlinMemberInfo
+import org.jetbrains.kotlin.idea.refactoring.memberInfo.KotlinMemberSelectionPanel
+import org.jetbrains.kotlin.psi.KtClassOrObject
+import org.jetbrains.kotlin.psi.KtNamedDeclaration
+import java.awt.BorderLayout
+import javax.swing.Box
+import javax.swing.JComponent
+import javax.swing.JPanel
+import javax.swing.JTextField
+
+abstract class KotlinExtractSuperDialogBase(
+        protected val originalClass: KtClassOrObject,
+        protected val targetParent: PsiElement,
+        private val conflictChecker: (KotlinExtractSuperDialogBase) -> Boolean,
+        private val isExtractInterface: Boolean,
+        refactoringName: String,
+        private val refactoring: (ExtractSuperInfo) -> Unit
+) : JavaExtractSuperBaseDialog(originalClass.project, originalClass.toLightClass()!!, emptyList(), refactoringName) {
+    private lateinit var memberInfoModel: MemberInfoModelBase
+
+    val selectedMembers: List<KotlinMemberInfo>
+        get() = memberInfoModel.memberInfos.filter { it.isChecked }
+
+    private val fileNameField = JTextField()
+
+    open class MemberInfoModelBase(
+            val memberInfos: List<KotlinMemberInfo>
+    ) : AbstractMemberInfoModel<KtNamedDeclaration, KotlinMemberInfo>() {
+        override fun isFixedAbstract(memberInfo: KotlinMemberInfo?) = true
+    }
+
+    val selectedTargetParent: PsiElement
+        get() = if (targetParent is PsiDirectory) targetDirectory else targetParent
+
+    val targetFileName: String
+        get() = fileNameField.text
+
+    protected abstract fun createMemberInfoModel(): MemberInfoModelBase
+
+    override fun getDocCommentPanelName() = "KDoc for abstracts"
+
+    override fun checkConflicts() = conflictChecker(this)
+
+    override fun createActionComponent() = Box.createHorizontalBox()!!
+
+    override fun createDestinationRootPanel() = if (targetParent is PsiDirectory) super.createDestinationRootPanel() else null
+
+    override fun createNorthPanel(): JComponent? {
+        return super.createNorthPanel().apply {
+            if (targetParent !is PsiDirectory) {
+                myPackageNameLabel.parent.remove(myPackageNameLabel)
+                myPackageNameField.parent.remove(myPackageNameField)
+            }
+        }
+    }
+
+    override fun createCenterPanel(): JComponent? {
+        memberInfoModel = createMemberInfoModel().apply {
+            memberInfoChanged(MemberInfoChange(memberInfos))
+        }
+
+        return JPanel(BorderLayout()).apply {
+            val memberSelectionPanel = KotlinMemberSelectionPanel(
+                    RefactoringBundle.message(if (isExtractInterface) "members.to.form.interface" else "members.to.form.superclass"),
+                    memberInfoModel.memberInfos,
+                    RefactoringBundle.message("make.abstract")
+            )
+            memberSelectionPanel.table.memberInfoModel = memberInfoModel
+            memberSelectionPanel.table.addMemberInfoChangeListener(memberInfoModel)
+            add(memberSelectionPanel, BorderLayout.CENTER)
+
+            add(myDocCommentPanel, BorderLayout.EAST)
+        }
+    }
+
+    override fun init() {
+        super.init()
+
+        fileNameField.text = "$extractedSuperName.${KotlinFileType.EXTENSION}"
+    }
+
+    override fun preparePackage() {
+        if (targetParent is PsiDirectory) super.preparePackage()
+    }
+
+    override fun isExtractSuperclass() = true
+
+    override fun validateName(name: String): String? {
+        return when {
+            !KotlinNameSuggester.isIdentifier(name.quoteIfNeeded()) -> RefactoringMessageUtil.getIncorrectIdentifierMessage(name)
+            name.unquote() == mySourceClass.name -> "Different name expected"
+            else -> null
+        }
+    }
+
+    override fun createProcessor() = null
+
+    override fun executeRefactoring() {
+        val extractInfo = ExtractSuperInfo(
+                mySourceClass.unwrapped as KtClassOrObject,
+                selectedMembers,
+                if (targetParent is PsiDirectory) targetDirectory else targetParent,
+                targetFileName,
+                extractedSuperName.quoteIfNeeded(),
+                isExtractInterface,
+                DocCommentPolicy<PsiComment>(docCommentPolicy)
+        )
+        refactoring(extractInfo)
+    }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractClass/ui/KotlinExtractSuperclassDialog.kt

@@ -16,81 +16,39 @@
 
 package org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ui
 
-import com.intellij.psi.PsiComment
-import com.intellij.psi.PsiDirectory
 import com.intellij.psi.PsiElement
 import com.intellij.refactoring.HelpID
 import com.intellij.refactoring.JavaRefactoringSettings
 import com.intellij.refactoring.RefactoringBundle
-import com.intellij.refactoring.classMembers.AbstractMemberInfoModel
-import com.intellij.refactoring.classMembers.MemberInfoChange
-import com.intellij.refactoring.extractSuperclass.ExtractSuperBaseDialog
-import com.intellij.refactoring.extractSuperclass.JavaExtractSuperBaseDialog
-import com.intellij.refactoring.util.DocCommentPolicy
-import com.intellij.refactoring.util.RefactoringMessageUtil
-import com.intellij.ui.components.JBLabel
-import com.intellij.util.ui.FormBuilder
-import org.jetbrains.kotlin.asJava.toLightClass
-import org.jetbrains.kotlin.asJava.unwrapped
-import org.jetbrains.kotlin.idea.KotlinFileType
-import org.jetbrains.kotlin.idea.core.KotlinNameSuggester
-import org.jetbrains.kotlin.idea.core.quoteIfNeeded
-import org.jetbrains.kotlin.idea.core.unquote
-import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperclassInfo
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperInfo
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.KotlinExtractSuperclassHandler
 import org.jetbrains.kotlin.idea.refactoring.memberInfo.KotlinMemberInfo
-import org.jetbrains.kotlin.idea.refactoring.memberInfo.KotlinMemberSelectionPanel
 import org.jetbrains.kotlin.idea.refactoring.memberInfo.extractClassMembers
 import org.jetbrains.kotlin.psi.KtClassOrObject
-import org.jetbrains.kotlin.psi.KtNamedDeclaration
 import org.jetbrains.kotlin.psi.KtNamedFunction
 import org.jetbrains.kotlin.psi.KtProperty
-import java.awt.BorderLayout
-import javax.swing.*
 
 class KotlinExtractSuperclassDialog(
         originalClass: KtClassOrObject,
-        private val targetParent: PsiElement,
-        private val conflictChecker: (KotlinExtractSuperclassDialog) -> Boolean,
-        private val refactoring: (ExtractSuperclassInfo) -> Unit
-) : JavaExtractSuperBaseDialog(
-        originalClass.project,
-        originalClass.toLightClass()!!,
-        emptyList(),
-        KotlinExtractSuperclassHandler.REFACTORING_NAME
-) {
+        targetParent: PsiElement,
+        conflictChecker: (KotlinExtractSuperDialogBase) -> Boolean,
+        refactoring: (ExtractSuperInfo) -> Unit
+) : KotlinExtractSuperDialogBase(originalClass, targetParent, conflictChecker, false, KotlinExtractSuperclassHandler.REFACTORING_NAME, refactoring) {
     companion object {
         private val DESTINATION_PACKAGE_RECENT_KEY = "KotlinExtractSuperclassDialog.RECENT_KEYS"
     }
 
-    val kotlinMemberInfos = extractClassMembers(originalClass)
-
-    val selectedMembers: List<KotlinMemberInfo>
-        get() = kotlinMemberInfos.filter { it.isChecked }
-
-    private val fileNameField = JTextField()
-
-    private val memberInfoModel = object : AbstractMemberInfoModel<KtNamedDeclaration, KotlinMemberInfo>() {
-        override fun isFixedAbstract(memberInfo: KotlinMemberInfo?) = true
-
-        override fun isAbstractEnabled(memberInfo: KotlinMemberInfo): Boolean {
-            val member = memberInfo.member
-            return member is KtNamedFunction || member is KtProperty
-        }
-    }.apply {
-        memberInfoChanged(MemberInfoChange(kotlinMemberInfos))
-    }
-
-    val selectedTargetParent: PsiElement
-        get() = if (targetParent is PsiDirectory) targetDirectory else targetParent
-
-    val targetFileName: String
-        get() = fileNameField.text
-
     init {
         init()
+    }
 
-        fileNameField.text = "$extractedSuperName.${KotlinFileType.EXTENSION}"
+    override fun createMemberInfoModel(): MemberInfoModelBase {
+        return object : MemberInfoModelBase(extractClassMembers(originalClass)) {
+            override fun isAbstractEnabled(memberInfo: KotlinMemberInfo): Boolean {
+                val member = memberInfo.member
+                return member is KtNamedFunction || member is KtProperty
+            }
+        }
     }
 
     override fun getDestinationPackageRecentKey() = DESTINATION_PACKAGE_RECENT_KEY
@@ -109,94 +67,7 @@ class KotlinExtractSuperclassDialog(
         JavaRefactoringSettings.getInstance().EXTRACT_SUPERCLASS_JAVADOC = policy
     }
 
-    override fun getDocCommentPanelName() = "KDoc for abstracts"
-
     override fun getExtractedSuperNameNotSpecifiedMessage() = RefactoringBundle.message("no.superclass.name.specified")!!
 
     override fun getHelpId() = HelpID.EXTRACT_SUPERCLASS
-
-    override fun validateName(name: String): String? {
-        return when {
-            !KotlinNameSuggester.isIdentifier(name.quoteIfNeeded()) -> RefactoringMessageUtil.getIncorrectIdentifierMessage(name)
-            name.unquote() == mySourceClass.name -> "Different name expected"
-            else -> null
-        }
-    }
-
-    override fun checkConflicts() = conflictChecker(this)
-
-    override fun createActionComponent() = Box.createHorizontalBox()!!
-
-    override fun createDestinationRootPanel(): JPanel? {
-        if (targetParent !is PsiDirectory) return null
-
-        val targetDirectoryPanel = super.createDestinationRootPanel()
-        val targetFileNamePanel = JPanel(BorderLayout()).apply {
-            border = BorderFactory.createEmptyBorder(10, 0, 0, 0)
-            val label = JBLabel("Target file name:")
-            add(label, BorderLayout.NORTH)
-            label.labelFor = fileNameField
-            add(fileNameField, BorderLayout.CENTER)
-        }
-
-        return FormBuilder
-                .createFormBuilder()
-                .addComponent(targetDirectoryPanel)
-                .addComponent(targetFileNamePanel)
-                .panel
-    }
-
-    override fun createNorthPanel(): JComponent? {
-        return super.createNorthPanel().apply {
-            if (targetParent !is PsiDirectory) {
-                myPackageNameLabel.parent.remove(myPackageNameLabel)
-                myPackageNameField.parent.remove(myPackageNameField)
-            }
-        }
-    }
-
-    override fun createCenterPanel(): JComponent? {
-        return JPanel(BorderLayout()).apply {
-            val memberSelectionPanel = KotlinMemberSelectionPanel(
-                    RefactoringBundle.message("members.to.form.superclass"),
-                    kotlinMemberInfos,
-                    RefactoringBundle.message("make.abstract")
-            )
-            memberSelectionPanel.table.memberInfoModel = memberInfoModel
-            memberSelectionPanel.table.addMemberInfoChangeListener(memberInfoModel)
-            add(memberSelectionPanel, BorderLayout.CENTER)
-
-            add(myDocCommentPanel, BorderLayout.EAST)
-        }
-    }
-
-    override fun isExtractSuperclass() = true
-
-    override fun preparePackage() {
-        if (targetParent !is PsiDirectory) return
-
-        super.preparePackage()
-
-        val fileName = targetFileName
-        if (!fileName.endsWith(".${KotlinFileType.EXTENSION}")) {
-            throw ExtractSuperBaseDialog.OperationFailedException("Invalid Kotlin file name: $fileName")
-        }
-        RefactoringMessageUtil.checkCanCreateFile(myTargetDirectory, fileName)?.let {
-            throw ExtractSuperBaseDialog.OperationFailedException(it)
-        }
-    }
-
-    override fun createProcessor() = null
-
-    override fun executeRefactoring() {
-        val extractInfo = ExtractSuperclassInfo(
-                mySourceClass.unwrapped as KtClassOrObject,
-                selectedMembers,
-                if (targetParent is PsiDirectory) targetDirectory else targetParent,
-                targetFileName,
-                extractedSuperName.quoteIfNeeded(),
-                DocCommentPolicy<PsiComment>(docCommentPolicy)
-        )
-        refactoring(extractInfo)
-    }
 }

idea/testData/refactoring/extractInterface/addInterface.kt

@@ -0,0 +1,13 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+// SIBLING:
+class <caret>B : A(), T {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/addInterface.kt.after

@@ -0,0 +1,16 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+interface X : T {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}
+
+// SIBLING:
+class B : A(), X {
+}

idea/testData/refactoring/extractInterface/addInterfaceWithAbstract.kt

@@ -0,0 +1,13 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+// SIBLING:
+class <caret>B : A(), T {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/addInterfaceWithAbstract.kt.after

@@ -0,0 +1,18 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+interface X : T {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo()
+}
+
+// SIBLING:
+class B : A(), X {
+    // INFO: {checked: "true", toAbstract: "true"}
+    override fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/addTypeParameters.kt

@@ -0,0 +1,14 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+// SIBLING:
+class <caret>A<T, U : List<T>, V, W, X> : J<X>(), I<W> {
+    // INFO: {checked: "true"}
+    fun foo(u: U) {
+
+    }
+}

idea/testData/refactoring/extractInterface/addTypeParameters.kt.after

@@ -0,0 +1,17 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+interface B<T, U : List<T>, W> : I<W> {
+    // INFO: {checked: "true"}
+    fun foo(u: U) {
+
+    }
+}
+
+// SIBLING:
+class A<T, U : List<T>, V, W, X> : J<X>(), B<T, U, W> {
+}

idea/testData/refactoring/extractInterface/addTypeParametersWithAbstract.kt

@@ -0,0 +1,14 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+// SIBLING:
+class <caret>A<T, U : List<T>, V, W, X> : J<X>(), I<W> {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo() {
+        val u: U
+    }
+}

idea/testData/refactoring/extractInterface/addTypeParametersWithAbstract.kt.after

@@ -0,0 +1,19 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+interface B<W> : I<W> {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo()
+}
+
+// SIBLING:
+class A<T, U : List<T>, V, W, X> : J<X>(), B<W> {
+    // INFO: {checked: "true", toAbstract: "true"}
+    override fun foo() {
+        val u: U
+    }
+}

idea/testData/refactoring/extractInterface/annotation.kt

@@ -0,0 +1,3 @@
+// NAME: B
+// SIBLING:
+annotation class <caret>A

idea/testData/refactoring/extractInterface/annotation.kt.conflicts

@@ -0,0 +1 @@
+Interface cannot be extracted from an annotation class

idea/tests/org/jetbrains/kotlin/idea/refactoring/introduce/AbstractExtractionTest.kt

@@ -42,8 +42,8 @@ import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.idea.codeInsight.CodeInsightUtils
 import org.jetbrains.kotlin.idea.refactoring.checkConflictsInteractively
 import org.jetbrains.kotlin.idea.refactoring.chooseMembers
-import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperclassInfo
-import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperclassRefactoring
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperInfo
+import org.jetbrains.kotlin.idea.refactoring.introduce.extractClass.ExtractSuperRefactoring
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractFunction.EXTRACT_FUNCTION
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractFunction.ExtractKotlinFunctionHandler
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractionEngine.*
@@ -354,7 +354,7 @@ abstract class AbstractExtractionTest() : KotlinLightCodeInsightFixtureTestCase(
         }
     }
 
-    protected fun doExtractSuperclassTest(path: String) {
+    protected fun doExtractSuperTest(path: String, isInterface: Boolean) {
         doTest(path) { file ->
             file as KtFile
 
@@ -366,21 +366,26 @@ abstract class AbstractExtractionTest() : KotlinLightCodeInsightFixtureTestCase(
             val editor = fixture.editor
             val originalClass = file.findElementAt(editor.caretModel.offset)?.getStrictParentOfType<KtClassOrObject>()!!
             val memberInfos = chooseMembers(extractClassMembers(originalClass))
-            val conflicts = ExtractSuperclassRefactoring.collectConflicts(originalClass, memberInfos, targetParent, className)
+            val conflicts = ExtractSuperRefactoring.collectConflicts(originalClass, memberInfos, targetParent, className, isInterface)
             project.checkConflictsInteractively(conflicts) {
-                val extractInfo = ExtractSuperclassInfo(
+                val extractInfo = ExtractSuperInfo(
                         originalClass,
                         memberInfos,
                         targetParent,
                         "$className.${KotlinFileType.EXTENSION}",
                         className,
+                        isInterface,
                         DocCommentPolicy<PsiComment>(DocCommentPolicy.ASIS)
                 )
-                ExtractSuperclassRefactoring(extractInfo).performRefactoring()
+                ExtractSuperRefactoring(extractInfo).performRefactoring()
             }
         }
     }
 
+    protected fun doExtractSuperclassTest(path: String) = doExtractSuperTest(path, false)
+
+    protected fun doExtractInterfaceTest(path: String) = doExtractSuperTest(path, true)
+
     protected fun doTest(path: String, checkAdditionalAfterdata: Boolean = false, action: (PsiFile) -> Unit) {
         val mainFile = File(path)
         val afterFile = File("$path.after")

idea/tests/org/jetbrains/kotlin/idea/refactoring/introduce/ExtractionTestGenerated.java

@@ -4258,4 +4258,43 @@ public class ExtractionTestGenerated extends AbstractExtractionTest {
             doExtractSuperclassTest(fileName);
         }
     }
+
+    @TestMetadata("idea/testData/refactoring/extractInterface")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class ExtractInterface extends AbstractExtractionTest {
+        @TestMetadata("addInterface.kt")
+        public void testAddInterface() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractInterface/addInterface.kt");
+            doExtractInterfaceTest(fileName);
+        }
+
+        @TestMetadata("addInterfaceWithAbstract.kt")
+        public void testAddInterfaceWithAbstract() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractInterface/addInterfaceWithAbstract.kt");
+            doExtractInterfaceTest(fileName);
+        }
+
+        @TestMetadata("addTypeParameters.kt")
+        public void testAddTypeParameters() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractInterface/addTypeParameters.kt");
+            doExtractInterfaceTest(fileName);
+        }
+
+        @TestMetadata("addTypeParametersWithAbstract.kt")
+        public void testAddTypeParametersWithAbstract() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractInterface/addTypeParametersWithAbstract.kt");
+            doExtractInterfaceTest(fileName);
+        }
+
+        public void testAllFilesPresentInExtractInterface() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/refactoring/extractInterface"), Pattern.compile("^(.+)\\.(kt|kts)$"), true);
+        }
+
+        @TestMetadata("annotation.kt")
+        public void testAnnotation() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractInterface/annotation.kt");
+            doExtractInterfaceTest(fileName);
+        }
+    }
 }