Find Usages and Go to declaration of element used via import alias

#KT-18619 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/referenceUtil.kt

@@ -242,6 +242,10 @@ fun KtElement.resolveMainReferenceToDescriptors(): Collection<DeclarationDescrip
     return mainReference?.resolveToDescriptors(bindingContext) ?: emptyList()
 }
 
+fun PsiReference.getImportAlias(): KtImportAlias? {
+    return (this as? KtSimpleNameReference)?.getImportAlias()
+}
+
 // ----------- Read/write access -----------------------------------------------------------------------------------------------------------------------
 
 enum class ReferenceAccess(val isRead: Boolean, val isWrite: Boolean) {

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/ideaExtensions/KotlinImportAliasGotoDeclarationHandler.kt

@@ -0,0 +1,27 @@
+/*
+ * 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.idea.search.ideaExtensions
+
+import com.intellij.codeInsight.navigation.actions.GotoDeclarationHandler
+import com.intellij.openapi.editor.Editor
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.idea.references.mainReference
+import org.jetbrains.kotlin.idea.util.application.runReadAction
+import org.jetbrains.kotlin.psi.KtImportAlias
+import org.jetbrains.kotlin.psi.psiUtil.getQualifiedElementSelector
+
+class KotlinImportAliasGotoDeclarationHandler : GotoDeclarationHandler {
+    override fun getGotoDeclarationTargets(sourceElement: PsiElement?, offset: Int, editor: Editor?): Array<PsiElement>? {
+        val importAlias = sourceElement?.parent as? KtImportAlias ?: return null
+
+        val result =
+            runReadAction {
+                importAlias.importDirective?.importedReference?.getQualifiedElementSelector()?.mainReference?.multiResolve(false)
+            } ?: return null
+
+        return result.mapNotNull { it.element }.toTypedArray()
+    }
+}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/ideaExtensions/KotlinReferencesSearcher.kt

@@ -17,12 +17,10 @@
 package org.jetbrains.kotlin.idea.search.ideaExtensions
 
 import com.intellij.openapi.application.QueryExecutorBase
+import com.intellij.openapi.util.text.StringUtil
 import com.intellij.psi.*
 import com.intellij.psi.impl.cache.CacheManager
-import com.intellij.psi.search.GlobalSearchScope
+import com.intellij.psi.search.*
-import com.intellij.psi.search.SearchRequestCollector
-import com.intellij.psi.search.SearchScope
-import com.intellij.psi.search.UsageSearchContext
 import com.intellij.psi.search.searches.ReferencesSearch
 import com.intellij.util.Processor
 import com.intellij.util.containers.nullize
@@ -36,8 +34,10 @@ import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.asJava.toLightElements
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.idea.references.KtSimpleNameReference
+import org.jetbrains.kotlin.idea.references.mainReference
 import org.jetbrains.kotlin.idea.search.*
 import org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinReferencesSearchOptions.Companion.Empty
+import org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinReferencesSearchOptions.Companion.calculateEffectiveScope
 import org.jetbrains.kotlin.idea.search.usagesSearch.dataClassComponentFunction
 import org.jetbrains.kotlin.idea.search.usagesSearch.filterDataClassComponentsIfDisabled
 import org.jetbrains.kotlin.idea.search.usagesSearch.getClassNameForCompanionObject
@@ -47,6 +47,7 @@ import org.jetbrains.kotlin.idea.util.application.runReadAction
 import org.jetbrains.kotlin.idea.util.expectedDeclarationIfAny
 import org.jetbrains.kotlin.idea.util.isExpectDeclaration
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.getQualifiedElementSelector
 import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 import org.jetbrains.kotlin.psi.psiUtil.hasActualModifier
 import org.jetbrains.kotlin.psi.psiUtil.parents
@@ -57,6 +58,7 @@ data class KotlinReferencesSearchOptions(
     val acceptOverloads: Boolean = false,
     val acceptExtensionsOfDeclarationClass: Boolean = false,
     val acceptCompanionObjectMembers: Boolean = false,
+    val acceptImportAlias: Boolean = true,
     val searchForComponentConventions: Boolean = true,
     val searchForOperatorConventions: Boolean = true,
     val searchNamedArguments: Boolean = true,
@@ -66,6 +68,22 @@ data class KotlinReferencesSearchOptions(
 
     companion object {
         val Empty = KotlinReferencesSearchOptions()
+
+        internal fun calculateEffectiveScope(
+            unwrappedElement: PsiNamedElement,
+            parameters: ReferencesSearch.SearchParameters
+        ): SearchScope {
+            val kotlinOptions = (parameters as? KotlinReferencesSearchParameters)?.kotlinOptions ?: Empty
+            val elements = if (unwrappedElement is KtDeclaration && !isOnlyKotlinSearch(parameters.scopeDeterminedByUser)) {
+                unwrappedElement.toLightElements().filterDataClassComponentsIfDisabled(kotlinOptions).nullize()
+            } else {
+                null
+            } ?: listOf(unwrappedElement)
+
+            return elements.fold(parameters.effectiveSearchScope) { scope, e ->
+                scope.unionSafe(parameters.effectiveSearchScope(e))
+            }
+        }
     }
 }
 
@@ -77,6 +95,43 @@ class KotlinReferencesSearchParameters(
     val kotlinOptions: KotlinReferencesSearchOptions = Empty
 ) : ReferencesSearch.SearchParameters(elementToSearch, scope, ignoreAccessScope, optimizer)
 
+class KotlinAliasedImportedElementSearcher : QueryExecutorBase<PsiReference, ReferencesSearch.SearchParameters>(true) {
+    override fun processQuery(parameters: ReferencesSearch.SearchParameters, consumer: Processor<in PsiReference?>) {
+        val kotlinOptions = (parameters as? KotlinReferencesSearchParameters)?.kotlinOptions ?: Empty
+        if (!kotlinOptions.acceptImportAlias) return
+        val element = parameters.elementToSearch
+        if (!element.isValid) return
+        val unwrappedElement = element.namedUnwrappedElement ?: return
+        val name = unwrappedElement.name
+        if (name == null || StringUtil.isEmptyOrSpaces(name)) return
+        val effectiveSearchScope = calculateEffectiveScope(unwrappedElement, parameters)
+
+        val collector = parameters.optimizer
+        val session = collector.searchSession
+        collector.searchWord(name, effectiveSearchScope, UsageSearchContext.IN_CODE, true, element, AliasProcessor(element, session))
+    }
+
+    private class AliasProcessor(
+        private val myTarget: PsiElement,
+        private val mySession: SearchSession
+    ) : RequestResultProcessor(myTarget) {
+        override fun processTextOccurrence(element: PsiElement, offsetInElement: Int, consumer: Processor<in PsiReference>): Boolean {
+            val importStatement = element.parent as? KtImportDirective ?: return true
+            val importAlias = importStatement.alias?.name ?: return true
+
+            val reference = importStatement.importedReference?.getQualifiedElementSelector()?.mainReference ?: return true
+            if (!reference.isReferenceTo(myTarget)) {
+                return true
+            }
+
+            val collector = SearchRequestCollector(mySession)
+            val fileScope: SearchScope = LocalSearchScope(element.containingFile)
+            collector.searchWord(importAlias, fileScope, UsageSearchContext.IN_CODE, true, myTarget)
+            return PsiSearchHelper.getInstance(element.project).processRequests(collector, consumer)
+        }
+    }
+}
+
 class KotlinReferencesSearcher : QueryExecutorBase<PsiReference, ReferencesSearch.SearchParameters>() {
 
     override fun processQuery(queryParameters: ReferencesSearch.SearchParameters, consumer: Processor<in PsiReference>) {
@@ -108,17 +163,7 @@ class KotlinReferencesSearcher : QueryExecutorBase<PsiReference, ReferencesSearc
                     null
                 } ?: unwrappedElement
 
-            val effectiveSearchScope = run {
+            val effectiveSearchScope = calculateEffectiveScope(unwrappedElement, queryParameters)
-                val elements = if (elementToSearch is KtDeclaration && !isOnlyKotlinSearch(queryParameters.scopeDeterminedByUser)) {
-                    elementToSearch.toLightElements().filterDataClassComponentsIfDisabled(kotlinOptions).nullize()
-                } else {
-                    null
-                } ?: listOf(elementToSearch)
-
-                elements.fold(queryParameters.effectiveSearchScope) { scope, e ->
-                    scope.unionSafe(queryParameters.effectiveSearchScope(e))
-                }
-            }
 
             val refFilter: (PsiReference) -> Boolean = when (elementToSearch) {
                 is KtParameter -> ({ ref: PsiReference -> !ref.isNamedArgumentReference()/* they are processed later*/ })

idea/resources/META-INF/plugin-common.xml

@@ -462,6 +462,11 @@
     <refactoring.moveClassHandler
         implementation="org.jetbrains.kotlin.idea.refactoring.move.moveFilesOrDirectories.MoveKotlinClassHandler"
         order="first"/>
+    <refactoring.moveClassHandler
+        implementation="org.jetbrains.kotlin.idea.refactoring.move.moveFilesOrDirectories.MoveKotlinAliasClassHandler"
+        order="first"/>
+    <refactoring.moveMemberHandler language="kotlin"
+                                   implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveKotlinMemberHandler"/>
     <refactoring.moveInnerClassUsagesHandler
         implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveJavaInnerClassKotlinUsagesHandler"
         language="kotlin" />
@@ -771,7 +776,9 @@
 
     <attachSourcesProvider implementation="org.jetbrains.kotlin.idea.actions.DecompileKotlinToJavaActionProvider"/>
 
+    <gotoDeclarationHandler implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinImportAliasGotoDeclarationHandler"/>
     <referencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinReferencesSearcher"/>
+    <referencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinAliasedImportedElementSearcher"/>
     <directClassInheritorsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinDirectInheritorsSearcher"/>
     <overridingMethodsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinOverridingMethodsWithGenericsSearcher"/>
     <definitionsScopedSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinDefinitionsSearcher"/>

idea/resources/META-INF/plugin-common.xml.191

@@ -471,6 +471,11 @@
     <refactoring.moveClassHandler
         implementation="org.jetbrains.kotlin.idea.refactoring.move.moveFilesOrDirectories.MoveKotlinClassHandler"
         order="first"/>
+    <refactoring.moveClassHandler
+        implementation="org.jetbrains.kotlin.idea.refactoring.move.moveFilesOrDirectories.MoveKotlinAliasClassHandler"
+        order="first"/>
+    <refactoring.moveMemberHandler language="kotlin"
+                                   implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveKotlinMemberHandler"/>
     <refactoring.moveInnerClassUsagesHandler
         implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveJavaInnerClassKotlinUsagesHandler"
         language="kotlin" />
@@ -780,7 +785,9 @@
 
     <attachSourcesProvider implementation="org.jetbrains.kotlin.idea.actions.DecompileKotlinToJavaActionProvider"/>
 
+    <gotoDeclarationHandler implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinImportAliasGotoDeclarationHandler"/>
     <referencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinReferencesSearcher"/>
+    <referencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinAliasedImportedElementSearcher"/>
     <directClassInheritorsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinDirectInheritorsSearcher"/>
     <overridingMethodsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinOverridingMethodsWithGenericsSearcher"/>
     <definitionsScopedSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinDefinitionsSearcher"/>

idea/resources/META-INF/plugin-common.xml.192

@@ -471,6 +471,11 @@
     <refactoring.moveClassHandler
         implementation="org.jetbrains.kotlin.idea.refactoring.move.moveFilesOrDirectories.MoveKotlinClassHandler"
         order="first"/>
+    <refactoring.moveClassHandler
+        implementation="org.jetbrains.kotlin.idea.refactoring.move.moveFilesOrDirectories.MoveKotlinAliasClassHandler"
+        order="first"/>
+    <refactoring.moveMemberHandler language="kotlin"
+                                   implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveKotlinMemberHandler"/>
     <refactoring.moveInnerClassUsagesHandler
         implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveJavaInnerClassKotlinUsagesHandler"
         language="kotlin" />
@@ -780,7 +785,9 @@
 
     <attachSourcesProvider implementation="org.jetbrains.kotlin.idea.actions.DecompileKotlinToJavaActionProvider"/>
 
+    <gotoDeclarationHandler implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinImportAliasGotoDeclarationHandler"/>
     <referencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinReferencesSearcher"/>
+    <referencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinAliasedImportedElementSearcher"/>
     <directClassInheritorsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinDirectInheritorsSearcher"/>
     <overridingMethodsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinOverridingMethodsWithGenericsSearcher"/>
     <definitionsScopedSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinDefinitionsSearcher"/>

idea/resources/META-INF/plugin.xml.201

@@ -90,5 +90,8 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
 
     <completion.ml.model implementation="org.jetbrains.kotlin.idea.completion.ml.KotlinMLRankingProvider"/>
     <suggestedRefactoringSupport language="kotlin" implementationClass="org.jetbrains.kotlin.idea.refactoring.suggested.KotlinSuggestedRefactoringSupport"/>
+
+    <refactoring.moveInnerHandler language="kotlin"
+                                  implementationClass="org.jetbrains.kotlin.idea.refactoring.move.MoveKotlinInnerHandler"/>
   </extensions>
 </idea-plugin>

idea/src/org/jetbrains/kotlin/idea/findUsages/KotlinFindUsagesHandlerFactory.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.idea.findUsages
 import com.intellij.CommonBundle
 import com.intellij.find.FindBundle
 import com.intellij.find.findUsages.FindUsagesHandler
+import com.intellij.find.findUsages.FindUsagesHandler.NULL_HANDLER
 import com.intellij.find.findUsages.FindUsagesHandlerFactory
 import com.intellij.find.findUsages.FindUsagesOptions
 import com.intellij.find.findUsages.JavaFindUsagesHandlerFactory
@@ -35,7 +36,9 @@ import org.jetbrains.kotlin.idea.findUsages.handlers.KotlinFindClassUsagesHandle
 import org.jetbrains.kotlin.idea.findUsages.handlers.KotlinFindMemberUsagesHandler
 import org.jetbrains.kotlin.idea.findUsages.handlers.KotlinTypeParameterFindUsagesHandler
 import org.jetbrains.kotlin.idea.refactoring.checkSuperMethods
+import org.jetbrains.kotlin.idea.references.mainReference
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.getQualifiedElementSelector
 import org.jetbrains.kotlin.psi.psiUtil.parameterIndex
 
 class KotlinFindUsagesHandlerFactory(project: Project) : FindUsagesHandlerFactory() {
@@ -52,10 +55,27 @@ class KotlinFindUsagesHandlerFactory(project: Project) : FindUsagesHandlerFactor
                 element is KtProperty ||
                 element is KtParameter ||
                 element is KtTypeParameter ||
-                element is KtConstructor<*>
+                element is KtConstructor<*> ||
+                (element is KtImportAlias &&
+                        // TODO: it is ambiguous case: ImportAlias does not have any reference to be resolved
+                        element.importDirective?.importedReference?.getQualifiedElementSelector()?.mainReference?.resolve() != null)
+
 
     override fun createFindUsagesHandler(element: PsiElement, forHighlightUsages: Boolean): FindUsagesHandler {
         when (element) {
+            is KtImportAlias -> {
+                return when (val resolvedElement =
+                    element.importDirective?.importedReference?.getQualifiedElementSelector()?.mainReference?.resolve()) {
+                    is KtClassOrObject ->
+                        if (!forHighlightUsages) {
+                            createFindUsagesHandler(resolvedElement, forHighlightUsages)
+                        } else NULL_HANDLER
+                    is KtNamedFunction, is KtProperty, is KtConstructor<*> ->
+                        createFindUsagesHandler(resolvedElement, forHighlightUsages)
+                    else -> NULL_HANDLER
+                }
+            }
+
             is KtClassOrObject ->
                 return KotlinFindClassUsagesHandler(element, this)
 
@@ -118,10 +138,10 @@ class KotlinFindUsagesHandlerFactory(project: Project) : FindUsagesHandlerFactor
 
     private fun handlerForMultiple(originalDeclaration: KtNamedDeclaration, declarations: Collection<PsiElement>): FindUsagesHandler {
         return when (declarations.size) {
-            0 -> FindUsagesHandler.NULL_HANDLER
+            0 -> NULL_HANDLER
 
             1 -> {
-                val target = declarations.single().unwrapped ?: return FindUsagesHandler.NULL_HANDLER
+                val target = declarations.single().unwrapped ?: return NULL_HANDLER
                 if (target is KtNamedDeclaration) {
                     KotlinFindMemberUsagesHandler.getInstance(target, factory = this)
                 } else {

idea/src/org/jetbrains/kotlin/idea/refactoring/move/MoveKotlinInnerHandler.kt.201

@@ -0,0 +1,19 @@
+/*
+ * 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.idea.refactoring.move
+
+import com.intellij.refactoring.move.moveInner.MoveJavaInnerHandler
+import com.intellij.usageView.UsageInfo
+import org.jetbrains.kotlin.idea.references.getImportAlias
+
+class MoveKotlinInnerHandler : MoveJavaInnerHandler() {
+
+    override fun preprocessUsages(results: MutableCollection<UsageInfo>?) {
+        results?.removeAll { usageInfo ->
+            usageInfo.element?.references?.any { it.getImportAlias() != null } == true
+        }
+    }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/move/MoveKotlinMemberHandler.kt

@@ -0,0 +1,35 @@
+/*
+ * 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.idea.refactoring.move
+
+import com.intellij.psi.PsiClass
+import com.intellij.psi.PsiMember
+import com.intellij.psi.PsiReference
+import com.intellij.refactoring.move.moveMembers.MoveJavaMemberHandler
+import com.intellij.refactoring.move.moveMembers.MoveMembersOptions
+import com.intellij.refactoring.move.moveMembers.MoveMembersProcessor
+import org.jetbrains.kotlin.idea.references.getImportAlias
+
+class MoveKotlinMemberHandler : MoveJavaMemberHandler() {
+    override fun getUsage(
+        member: PsiMember,
+        psiReference: PsiReference,
+        membersToMove: MutableSet<PsiMember>,
+        targetClass: PsiClass
+    ): MoveMembersProcessor.MoveMembersUsageInfo? {
+        psiReference?.getImportAlias()?.let {
+            return null
+        }
+        return super.getUsage(member, psiReference, membersToMove, targetClass)
+    }
+
+    override fun changeExternalUsage(options: MoveMembersOptions, usage: MoveMembersProcessor.MoveMembersUsageInfo): Boolean {
+        val reference = usage.getReference()
+        reference?.getImportAlias()?.let { return true }
+
+        return super.changeExternalUsage(options, usage)
+    }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/MoveKotlinDeclarationsProcessor.kt

@@ -222,8 +222,8 @@ class MoveKotlinDeclarationsProcessor(
                     )
                 }
 
-                MoveClassHandler.EP_NAME.extensions.forEach { handler ->
+                MoveClassHandler.EP_NAME.extensions.filter { it !is MoveKotlinClassHandler }.forEach { handler ->
-                    if (handler !is MoveKotlinClassHandler) handler.preprocessUsages(results)
+                    handler.preprocessUsages(results)
                 }
 
                 results

idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveFilesOrDirectories/MoveKotlinAliasClassHandler.kt

@@ -0,0 +1,42 @@
+/*
+ * 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.move.moveFilesOrDirectories
+
+import com.intellij.psi.PsiClass
+import com.intellij.psi.PsiDirectory
+import com.intellij.refactoring.move.moveClassesOrPackages.MoveClassHandler
+import com.intellij.refactoring.util.MoveRenameUsageInfo
+import com.intellij.usageView.UsageInfo
+import org.jetbrains.kotlin.idea.references.getImportAlias
+
+class MoveKotlinAliasClassHandler : MoveClassHandler {
+    override fun doMoveClass(aClass: PsiClass, moveDestination: PsiDirectory): PsiClass? = null
+    override fun getName(clazz: PsiClass?): String? = null
+
+    override fun preprocessUsages(results: MutableCollection<UsageInfo>) {
+        results.removeAll { usageInfo ->
+            usageInfo is MoveRenameUsageInfo && usageInfo.reference?.getImportAlias() != null
+        }
+    }
+
+    override fun prepareMove(aClass: PsiClass) {
+    }
+
+    override fun finishMoveClass(aClass: PsiClass) {
+    }
+
+}

idea/testData/findUsages/java/findJavaClassUsages/JKAliasedClassAllUsages.0.java

@@ -0,0 +1,18 @@
+// PSI_ELEMENT: com.intellij.psi.PsiClass
+// OPTIONS: usages
+public class <caret>AAA {
+    public String bar = "bar";
+    public static String BAR = "BAR";
+
+    public AAA() {
+
+    }
+
+    public void foo() {
+
+    }
+
+    public static void foos() {
+
+    }
+}

idea/testData/findUsages/java/findJavaClassUsages/JKAliasedClassAllUsages.1.kt

@@ -0,0 +1,39 @@
+import AAA as A
+public class X(bar: String? = A.BAR): A() {
+    var next: A? = A()
+    val myBar: String? = A.BAR
+
+    init {
+        A.BAR = ""
+        AAA.foos()
+    }
+
+    fun foo(a: A) {
+        val aa: AAA = a
+        aa.bar = ""
+    }
+
+    fun getNext(): A? {
+        return next
+    }
+
+    public override fun foo() {
+        super<A>.foo()
+    }
+
+    companion object: AAA() {
+
+    }
+}
+
+object O: A() {
+
+}
+
+fun X.bar(a: A = A()) {
+
+}
+
+fun Any.toA(): A? {
+    return if (this is A) this as A else null
+}

idea/testData/findUsages/java/findJavaClassUsages/JKAliasedClassAllUsages.results.txt

@@ -0,0 +1,17 @@
+Class/object property type 3 var next: A? = A()
+Function return types 16 fun getNext(): A? {
+Function return types 37 fun Any.toA(): A? {
+Nested class/object 2 public class X(bar: String? = A.BAR): A() {
+Nested class/object 4 val myBar: String? = A.BAR
+Nested class/object 7 A.BAR = ""
+Nested class/object 8 AAA.foos()
+New instance creation 3 var next: A? = A()
+New instance creation 33 fun X.bar(a: A = A()) {
+Parameter type 11 fun foo(a: A) {
+Parameter type 33 fun X.bar(a: A = A()) {
+Super type qualifier 21 super<A>.foo()
+Supertype 2 public class X(bar: String? = A.BAR): A() {
+Supertype 29 object O: A() {
+Target type of 'is' operation 38 return if (this is A) this as A else null
+Usage in cast target type 38 return if (this is A) this as A else null
+Usage in import 1 import AAA as A

idea/testData/findUsages/kotlin/findClassUsages/kotlinAliasedClassAllUsages.0.kt

@@ -0,0 +1,13 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtClass
+// OPTIONS: usages, constructorUsages
+package server
+
+open class <caret>Server {
+    companion object {
+        val NAME = "Server"
+    }
+
+    open fun work() {
+        println("Server")
+    }
+}

idea/testData/findUsages/kotlin/findClassUsages/kotlinAliasedClassAllUsages.1.kt

@@ -0,0 +1,55 @@
+package client
+
+import server.Server as Srv
+import server.Server
+
+class Client(name: String = Server.NAME): Srv() {
+    var nextServer: Server? = new Server()
+    val name = Server.NAME
+
+    /**
+     * [Srv] parameter
+     */
+    fun foo(s: Srv) {
+        val server: Server = s
+        println("Server: $server")
+    }
+
+    fun getNextServer(): Server? {
+        return nextServer
+    }
+
+    override fun work() {
+        super<Server>.work()
+        println("Client")
+    }
+
+    companion object: Server() {
+
+    }
+}
+
+object ClientObject: Server() {
+
+}
+
+class Servers: Iterator<Server> {
+
+}
+
+fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+
+fun Client.bar(s: Server = Server.NAME) {
+    foo(s)
+}
+
+fun Client.hasNextServer(): Boolean {
+    return getNextServer() != null
+}
+
+fun Any.asServer(): Server? {
+    when (this) {
+        is Server -> println("Server!")
+    }
+    return if (this is Server) this as Server else this as? Server
+}

idea/testData/findUsages/kotlin/findClassUsages/kotlinAliasedClassAllUsages.results.txt

@@ -0,0 +1,24 @@
+Class/object property type 7 var nextServer: Server? = new Server()
+Companion object 42 fun Client.bar(s: Server = Server.NAME) {
+Companion object 6 class Client(name: String = Server.NAME): Srv() {
+Companion object 8 val name = Server.NAME
+Function return types 18 fun getNextServer(): Server? {
+Function return types 50 fun Any.asServer(): Server? {
+Local variable declaration 14 val server: Server = s
+Parameter type 13 fun foo(s: Srv) {
+Parameter type 42 fun Client.bar(s: Server = Server.NAME) {
+Super type qualifier 23 super<Server>.work()
+Supertype 27 companion object: Server() {
+Supertype 32 object ClientObject: Server() {
+Supertype 6 class Client(name: String = Server.NAME): Srv() {
+Target type of 'is' operation 52 is Server -> println("Server!")
+Target type of 'is' operation 54 return if (this is Server) this as Server else this as? Server
+Type parameter 36 class Servers: Iterator<Server> {
+Type parameter 40 fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+Type parameter 40 fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+Type parameter 40 fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+Usage in cast target type 54 return if (this is Server) this as Server else this as? Server
+Usage in cast target type 54 return if (this is Server) this as Server else this as? Server
+Usage in comments 11 * [Srv] parameter
+Usage in import 3 import server.Server as Srv
+Usage in import 4 import server.Server

idea/testData/findUsages/kotlin/findClassUsages/kotlinClassImportAliasAllUsages.0.kt

@@ -0,0 +1,57 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtImportAlias
+// OPTIONS: usages, constructorUsages
+package client
+
+import server.Server as Srv<caret>
+import server.Server
+
+class Client(name: String = Server.NAME): Srv() {
+    var nextServer: Server? = new Server()
+    val name = Server.NAME
+
+    /**
+     * [Srv] parameter
+     */
+    fun foo(s: Srv) {
+        val server: Server = s
+        println("Server: $server")
+    }
+
+    fun getNextServer(): Server? {
+        return nextServer
+    }
+
+    override fun work() {
+        super<Server>.work()
+        println("Client")
+    }
+
+    companion object: Server() {
+
+    }
+}
+
+object ClientObject: Server() {
+
+}
+
+class Servers: Iterator<Server> {
+
+}
+
+fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+
+fun Client.bar(s: Server = Server.NAME) {
+    foo(s)
+}
+
+fun Client.hasNextServer(): Boolean {
+    return getNextServer() != null
+}
+
+fun Any.asServer(): Server? {
+    when (this) {
+        is Server -> println("Server!")
+    }
+    return if (this is Server) this as Server else this as? Server
+}

idea/testData/findUsages/kotlin/findClassUsages/kotlinClassImportAliasAllUsages.1.kt

@@ -0,0 +1,11 @@
+package server
+
+open class Server {
+    companion object {
+        val NAME = "Server"
+    }
+
+    open fun work() {
+        println("Server")
+    }
+}

idea/testData/findUsages/kotlin/findClassUsages/kotlinClassImportAliasAllUsages.results.txt

@@ -0,0 +1,24 @@
+Class/object property type 9 var nextServer: Server? = new Server()
+Companion object 10 val name = Server.NAME
+Companion object 44 fun Client.bar(s: Server = Server.NAME) {
+Companion object 8 class Client(name: String = Server.NAME): Srv() {
+Function return types 20 fun getNextServer(): Server? {
+Function return types 52 fun Any.asServer(): Server? {
+Local variable declaration 16 val server: Server = s
+Parameter type 15 fun foo(s: Srv) {
+Parameter type 44 fun Client.bar(s: Server = Server.NAME) {
+Super type qualifier 25 super<Server>.work()
+Supertype 29 companion object: Server() {
+Supertype 34 object ClientObject: Server() {
+Supertype 8 class Client(name: String = Server.NAME): Srv() {
+Target type of 'is' operation 54 is Server -> println("Server!")
+Target type of 'is' operation 56 return if (this is Server) this as Server else this as? Server
+Type parameter 38 class Servers: Iterator<Server> {
+Type parameter 42 fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+Type parameter 42 fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+Type parameter 42 fun Iterator<Server>.f(p: Iterator<Server>): Iterator<Server> = this
+Usage in cast target type 56 return if (this is Server) this as Server else this as? Server
+Usage in cast target type 56 return if (this is Server) this as Server else this as? Server
+Usage in comments 13 * [Srv] parameter
+Usage in import 5 import server.Server as Srv
+Usage in import 6 import server.Server

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinAliasedMethodUsages.0.kt

@@ -0,0 +1,5 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtNamedFunction
+// OPTIONS: usages
+package server
+
+fun <caret>processRequest() = "foo"

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinAliasedMethodUsages.1.kt

@@ -0,0 +1,7 @@
+import server.processRequest as process
+
+class Client {
+    public fun foo() {
+        process()
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinAliasedMethodUsages.results.txt

@@ -0,0 +1,2 @@
+Function call 5 process()
+Usage in import 1 import server.processRequest as process

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodAliasedUsages.0.kt

@@ -0,0 +1,15 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtImportAlias
+// OPTIONS: usages
+
+import server.processRequest as process<caret>
+import server.processRequest
+
+class Client {
+    fun foo() {
+        process()
+    }
+
+    fun foo2() {
+        processRequest()
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodAliasedUsages.1.kt

@@ -0,0 +1,3 @@
+package server
+
+fun processRequest() = "foo"

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodAliasedUsages.results.txt

@@ -0,0 +1,4 @@
+Function call 13 processRequest()
+Function call 9 process()
+Usage in import 4 import server.processRequest as process
+Usage in import 5 import server.processRequest

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodsAliasedUsages.0.kt

@@ -0,0 +1,18 @@
+// IGNORE: see KotlinFindUsagesHandlerFactory: it is ambiguous case: ImportAlias does not have any reference to be resolved
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtImportAlias
+// OPTIONS: usages
+
+package c
+
+import c.a
+import c.a as b<caret>
+
+fun a() = Unit
+fun a(i: Int) = Unit
+
+fun test() {
+    a()
+    a(1)
+    b()
+    b(1)
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodsAliasedUsages.results.txt

@@ -0,0 +1,8 @@
+Function call 13 a()
+Function call 14 a(1)
+Function call 15 b()
+Function call 16 b(1)
+Usage in import 6 import c.a
+Usage in import 6 import c.a
+Usage in import 7 import c.a as b
+Usage in import 7 import c.a as b

idea/testData/navigation/gotoDeclaration/importAlias.test

@@ -0,0 +1,17 @@
+// FILE: before.kt
+package c
+
+import c.I1 as I<caret>
+
+interface I1
+
+fun foo(i: I){}
+
+// FILE: after.kt
+package c
+
+import c.I1 as I
+
+interface <caret>I1
+
+fun foo(i: I){}

idea/testData/navigation/gotoDeclaration/importAliasMultiDeclarations.test

@@ -0,0 +1,27 @@
+// FILE: before.kt
+package c
+
+import c.a
+import c.a as b<caret> // caret stays here as it results into multiple results
+
+fun a() = Unit
+fun a(i: Int) = Unit
+
+fun test() {
+    a()
+    b()
+}
+
+// FILE: after.kt
+package c
+
+import c.a
+import c.a as b<caret> // caret stays here as it results into multiple results
+
+fun a() = Unit
+fun a(i: Int) = Unit
+
+fun test() {
+    a()
+    b()
+}

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInAnotherPackage/after/a/specificImport.kt

@@ -1,7 +1,5 @@
 package a
 
-import b.X as XX
-
 fun bar() {
-    val t: XX = XX()
+    val t: b.X = b.X()
 }

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInAnotherPackage/after/a/specificImport.kt.201

@@ -0,0 +1,7 @@
+package a
+
+import b.X as XX
+
+fun bar() {
+    val t: XX = XX()
+}

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInAnotherPackage/after/b/specificImport.kt

@@ -1,7 +1,5 @@
 package b
 
-import b.X as XX
-
 fun bar() {
-    val t: XX = XX()
+    val t: b.X = b.X()
 }

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInAnotherPackage/after/b/specificImport.kt.201

@@ -0,0 +1,7 @@
+package b
+
+import b.X as XX
+
+fun bar() {
+    val t: XX = XX()
+}

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInTheSamePackage/after/a/specificImport.kt

@@ -1,7 +1,5 @@
 package a
 
-import a.X as XX
-
 fun bar(s: String) {
-    val t: XX = XX()
+    val t: a.X = a.X()
 }

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInTheSamePackage/after/a/specificImport.kt.201

@@ -0,0 +1,7 @@
+package a
+
+import a.X as XX
+
+fun bar(s: String) {
+    val t: XX = XX()
+}

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInTheSamePackageAndRename/after/a/specificImport.kt

@@ -1,7 +1,5 @@
 package a
 
-import a.Y as XX
-
 fun bar(s: String) {
-    val t: XX = XX()
+    val t: a.Y = a.Y()
 }

idea/testData/refactoring/move/java/moveClass/moveInnerToTop/moveNestedClassToTopLevelInTheSamePackageAndRename/after/a/specificImport.kt.201

@@ -0,0 +1,7 @@
+package a
+
+import a.Y as XX
+
+fun bar(s: String) {
+    val t: XX = XX()
+}

idea/tests/org/jetbrains/kotlin/findUsages/AbstractFindUsagesTest.kt

@@ -89,6 +89,11 @@ abstract class AbstractFindUsagesTest : KotlinLightCodeInsightFixtureTestCase()
 
         val isPropertiesFile = FileUtilRt.getExtension(path) == "properties"
 
+        InTextDirectivesUtils.findStringWithPrefixes(mainFileText, "// IGNORE: ")?.let {
+            println("test $mainFileName is ignored")
+            return
+        }
+
         val isFindFileUsages = InTextDirectivesUtils.isDirectiveDefined(mainFileText, "## FIND_FILE_USAGES")
 
         @Suppress("UNCHECKED_CAST")

idea/tests/org/jetbrains/kotlin/findUsages/FindUsagesTestGenerated.java

@@ -351,6 +351,11 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                 runTest("idea/testData/findUsages/kotlin/findClassUsages/javaDerivedInterfaceUsages2.0.kt");
             }
 
+            @TestMetadata("kotlinAliasedClassAllUsages.0.kt")
+            public void testKotlinAliasedClassAllUsages() throws Exception {
+                runTest("idea/testData/findUsages/kotlin/findClassUsages/kotlinAliasedClassAllUsages.0.kt");
+            }
+
             @TestMetadata("kotlinClassAllUsages.0.kt")
             public void testKotlinClassAllUsages() throws Exception {
                 runTest("idea/testData/findUsages/kotlin/findClassUsages/kotlinClassAllUsages.0.kt");
@@ -431,6 +436,11 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                 runTest("idea/testData/findUsages/kotlin/findClassUsages/kotlinClassFunctionUsages2.0.kt");
             }
 
+            @TestMetadata("kotlinClassImportAliasAllUsages.0.kt")
+            public void testKotlinClassImportAliasAllUsages() throws Exception {
+                runTest("idea/testData/findUsages/kotlin/findClassUsages/kotlinClassImportAliasAllUsages.0.kt");
+            }
+
             @TestMetadata("kotlinClassNonConstructorUsages.0.kt")
             public void testKotlinClassNonConstructorUsages() throws Exception {
                 runTest("idea/testData/findUsages/kotlin/findClassUsages/kotlinClassNonConstructorUsages.0.kt");
@@ -614,6 +624,11 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                 runTest("idea/testData/findUsages/kotlin/findFunctionUsages/jvmStaticJvmOverloadsFun.0.kt");
             }
 
+            @TestMetadata("kotlinAliasedMethodUsages.0.kt")
+            public void testKotlinAliasedMethodUsages() throws Exception {
+                runTest("idea/testData/findUsages/kotlin/findFunctionUsages/kotlinAliasedMethodUsages.0.kt");
+            }
+
             @TestMetadata("kotlinInternalMethodUsages.0.kt")
             public void testKotlinInternalMethodUsages() throws Exception {
                 runTest("idea/testData/findUsages/kotlin/findFunctionUsages/kotlinInternalMethodUsages.0.kt");
@@ -629,6 +644,16 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                 runTest("idea/testData/findUsages/kotlin/findFunctionUsages/kotlinLocalMethodUsages2.0.kt");
             }
 
+            @TestMetadata("kotlinMethodAliasedUsages.0.kt")
+            public void testKotlinMethodAliasedUsages() throws Exception {
+                runTest("idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodAliasedUsages.0.kt");
+            }
+
+            @TestMetadata("kotlinMethodsAliasedUsages.0.kt")
+            public void testKotlinMethodsAliasedUsages() throws Exception {
+                runTest("idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodsAliasedUsages.0.kt");
+            }
+
             @TestMetadata("kotlinMethodUsages.0.kt")
             public void testKotlinMethodUsages() throws Exception {
                 runTest("idea/testData/findUsages/kotlin/findFunctionUsages/kotlinMethodUsages.0.kt");
@@ -1538,6 +1563,11 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                 KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/testData/findUsages/java/findJavaClassUsages"), Pattern.compile("^(.+)\\.0\\.java$"), null, true);
             }
 
+            @TestMetadata("JKAliasedClassAllUsages.0.java")
+            public void testJKAliasedClassAllUsages() throws Exception {
+                runTest("idea/testData/findUsages/java/findJavaClassUsages/JKAliasedClassAllUsages.0.java");
+            }
+
             @TestMetadata("JKClassAllUsages.0.java")
             public void testJKClassAllUsages() throws Exception {
                 runTest("idea/testData/findUsages/java/findJavaClassUsages/JKClassAllUsages.0.java");

idea/tests/org/jetbrains/kotlin/idea/navigation/GotoDeclarationTestGenerated.java

@@ -28,6 +28,16 @@ public class GotoDeclarationTestGenerated extends AbstractGotoDeclarationTest {
         KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/testData/navigation/gotoDeclaration"), Pattern.compile("^(.+)\\.test$"), null, true);
     }
 
+    @TestMetadata("importAlias.test")
+    public void testImportAlias() throws Exception {
+        runTest("idea/testData/navigation/gotoDeclaration/importAlias.test");
+    }
+
+    @TestMetadata("importAliasMultiDeclarations.test")
+    public void testImportAliasMultiDeclarations() throws Exception {
+        runTest("idea/testData/navigation/gotoDeclaration/importAliasMultiDeclarations.test");
+    }
+
     @TestMetadata("itExtensionLambda.test")
     public void testItExtensionLambda() throws Exception {
         runTest("idea/testData/navigation/gotoDeclaration/itExtensionLambda.test");