From cef7205f14b27efacb15216b84a315bef843ff6e Mon Sep 17 00:00:00 2001
From: Denis Zharkov <denis.zharkov@jetbrains.com>
Date: Mon, 19 Feb 2018 10:31:33 +0300
Subject: [PATCH] Fix CCE caused by KotlinPackageSourcesMemberNamesIndex

FileContentImpl::getPsiFile is not-nullable and at the same time
it contains an explicit case of its fileType to LanguageFileType
that leads to the following exception in case when kt-file is marked as plain text:

java.lang.ClassCastException: com.intellij.openapi.file.exclude.EnforcedPlainTextFileTypeFactory$1 cannot be cast to com.intellij.openapi.fileTypes.LanguageFileType
	at com.intellij.util.indexing.FileContentImpl.createFileFromText(FileContentImpl.java:135)
	at com.intellij.util.indexing.FileContentImpl.getPsiFile(FileContentImpl.java:104)

 #EA-114338 Fixed
---
 .../idea/vfilefinder/KotlinPackageSourcesMemberNamesIndex.kt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/vfilefinder/KotlinPackageSourcesMemberNamesIndex.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/vfilefinder/KotlinPackageSourcesMemberNamesIndex.kt
index 33cfcf972bc..30ae31432df 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/vfilefinder/KotlinPackageSourcesMemberNamesIndex.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/vfilefinder/KotlinPackageSourcesMemberNamesIndex.kt
@@ -30,10 +30,13 @@ object KotlinPackageSourcesMemberNamesIndex : FileBasedIndexExtension<String, Co
     override fun getInputFilter(): FileBasedIndex.InputFilter =
             FileBasedIndex.InputFilter { file -> file.extension == KotlinFileType.EXTENSION }
 
-    override fun getVersion(): Int = 1
+    override fun getVersion(): Int = 2
 
     override fun getIndexer(): DataIndexer<String, Collection<String>, FileContent> =
         DataIndexer { inputData ->
+            // Check if ".kt" file is marked as plain text
+            if (inputData.fileType !is KotlinFileType) return@DataIndexer emptyMap()
+
             val ktFile = inputData.psiFile as? KtFile ?: return@DataIndexer emptyMap()
             val packageName = ktFile.packageDirective?.fqName?.asString() ?: ""