Refactor: Provide API to create KtLightClassForFacade by synthetic file

compiler/light-classes/src/org/jetbrains/kotlin/asJava/KtLightClassForFacade.kt

@@ -49,7 +49,7 @@ class KtLightClassForFacade private constructor(
         private inner class FacadeCacheData {
             val cache = object : SLRUCache<StubCacheKey, CachedValue<KotlinFacadeLightClassData>>(20, 30) {
                 override fun createValue(key: StubCacheKey): CachedValue<KotlinFacadeLightClassData> {
-                    val stubProvider = LightClassDataProviderForFileFacade(project, key.fqName, key.searchScope)
+                    val stubProvider = LightClassDataProviderForFileFacade.ByProjectSource(project, key.fqName, key.searchScope)
                     return CachedValuesManager.getManager(project).createCachedValue<KotlinFacadeLightClassData>(stubProvider, /*trackValue = */false)
                 }
             }
@@ -199,5 +199,18 @@ class KtLightClassForFacade private constructor(
             val lightClassDataCache = FacadeStubCache.getInstance(manager.project).get(facadeClassFqName, searchScope)
             return KtLightClassForFacade(manager, facadeClassFqName, lightClassDataCache, files)
         }
+
+        fun createForSyntheticFile(
+                manager: PsiManager,
+                facadeClassFqName: FqName,
+                file: KtFile
+        ): KtLightClassForFacade {
+            // TODO: refactor, using cached value doesn't make sense for this case
+            val cachedValue = CachedValuesManager.getManager(manager.project).
+                    createCachedValue<KotlinFacadeLightClassData>(
+                            LightClassDataProviderForFileFacade.ByFile(manager.project, facadeClassFqName, file), /*trackValue = */false
+                    )
+            return KtLightClassForFacade(manager, facadeClassFqName, cachedValue, listOf(file))
+        }
     }
 }

compiler/light-classes/src/org/jetbrains/kotlin/asJava/LightClassDataProvider.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * 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.
@@ -281,12 +281,9 @@ class LightClassDataProviderForClassOrObject(private val classOrObject: KtClassO
     }
 }
 
-class LightClassDataProviderForFileFacade(
-        private val project: Project, private val facadeFqName: FqName, private val searchScope: GlobalSearchScope
+sealed class LightClassDataProviderForFileFacade private constructor(
+        protected val project: Project, protected val facadeFqName: FqName
 ) : LightClassDataProvider<KotlinFacadeLightClassData>(project) {
-    override val files: Collection<KtFile>
-        get() = LightClassGenerationSupport.getInstance(project).findFilesForFacade(facadeFqName, searchScope)
-
     override val packageFqName: FqName
         get() = facadeFqName.parent()
 
@@ -342,6 +339,26 @@ class LightClassDataProviderForFileFacade(
     override fun toString(): String {
         return this.javaClass.name + " for $facadeFqName"
     }
+
+    // create delegate by relevant files in project source using LightClassGenerationSupport
+    class ByProjectSource(
+            project: Project,
+            facadeFqName: FqName,
+            private val searchScope: GlobalSearchScope
+    ) : LightClassDataProviderForFileFacade(project, facadeFqName) {
+        override val files: Collection<KtFile>
+            get() = LightClassGenerationSupport.getInstance(project).findFilesForFacade(facadeFqName, searchScope)
+    }
+
+    // create delegate by single file
+    class ByFile(
+            project: Project,
+            facadeFqName: FqName,
+            private val file: KtFile
+    ) : LightClassDataProviderForFileFacade(project, facadeFqName) {
+        override val files: Collection<KtFile>
+            get() = listOf(file)
+    }
 }