From 1eb1735ac9c3986ddd0af3e1c1b640be239f3505 Mon Sep 17 00:00:00 2001
From: baratynskiy <baratynskiy@gmail.com>
Date: Tue, 16 May 2017 16:10:36 +0300
Subject: [PATCH] Return from `compile()` function immediately if javaFiles
 collection is empty

---
 .../src/org/jetbrains/kotlin/javac/JavacWrapper.kt        | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/compiler/javac-wrapper/src/org/jetbrains/kotlin/javac/JavacWrapper.kt b/compiler/javac-wrapper/src/org/jetbrains/kotlin/javac/JavacWrapper.kt
index f75024ac601..6112c664324 100644
--- a/compiler/javac-wrapper/src/org/jetbrains/kotlin/javac/JavacWrapper.kt
+++ b/compiler/javac-wrapper/src/org/jetbrains/kotlin/javac/JavacWrapper.kt
@@ -143,7 +143,7 @@ class JavacWrapper(javaFiles: Collection<File>,
             }
             .associateBy(TreeBasedPackage::fqName)
 
-    private val kotlinClassifiersCache = KotlinClassifiersCache(kotlinFiles, this)
+    private val kotlinClassifiersCache = KotlinClassifiersCache(if (javaFiles.isNotEmpty()) kotlinFiles else emptyList(), this)
     private val treePathResolverCache = TreePathResolverCache(this)
     private val symbolBasedClassesCache = hashMapOf<String, SymbolBasedClass?>()
     private val symbolBasedPackagesCache = hashMapOf<String, SymbolBasedPackage?>()
@@ -151,9 +151,13 @@ class JavacWrapper(javaFiles: Collection<File>,
     fun compile(outDir: File? = null): Boolean = with(javac) {
         if (errorCount() > 0) return false
 
+        val javaFilesNumber = fileObjects.length()
+        if (javaFilesNumber == 0) return true
+
         fileManager.setClassPathForCompilation(outDir)
         messageCollector?.report(CompilerMessageSeverity.INFO,
-                                 "Compiling Java sources")
+                                 "Compiling $javaFilesNumber Java source files" +
+                                 " to [${fileManager.getLocation(StandardLocation.CLASS_OUTPUT)?.firstOrNull()?.path}]")
         compile(fileObjects)
         errorCount() == 0
     }