From 6a6062ec325068eb76215c5666b0a010a6286992 Mon Sep 17 00:00:00 2001
From: Dmitry Batkovich <dmitry.batkovich@jetbrains.com>
Date: Thu, 2 Jul 2015 20:18:12 +0300
Subject: [PATCH] Iterables are converted to Stream using spliterator

---
 .../java18StreamApi/PseudoLambdaReplaceTemplate.java        | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/java/java-impl/src/com/intellij/codeInspection/java18StreamApi/PseudoLambdaReplaceTemplate.java b/java/java-impl/src/com/intellij/codeInspection/java18StreamApi/PseudoLambdaReplaceTemplate.java
index a7bf704520e4..425f1424837e 100644
--- a/java/java-impl/src/com/intellij/codeInspection/java18StreamApi/PseudoLambdaReplaceTemplate.java
+++ b/java/java-impl/src/com/intellij/codeInspection/java18StreamApi/PseudoLambdaReplaceTemplate.java
@@ -497,7 +497,11 @@ class PseudoLambdaReplaceTemplate {
     if (type instanceof PsiClassType) {
       final PsiClass resolved = ((PsiClassType)type).resolve();
       LOG.assertTrue(resolved != null && resolved.getQualifiedName() != null, type);
-      return collectionExpression.getText() + ".stream()";
+      if (InheritanceUtil.isInheritor(resolved, CommonClassNames.JAVA_UTIL_COLLECTION)) {
+        return collectionExpression.getText() + ".stream()";
+      } else {
+        return "java.util.stream.StreamSupport.stream(" + collectionExpression.getText() + ".spliterator(), false)";
+      }
     }
     else if (type instanceof PsiArrayType) {
       return CommonClassNames.JAVA_UTIL_ARRAYS + ".stream(" + collectionExpression.getText() + ")";