From 3e401e1a9572980eeab43d95bcb4654bd0591bf8 Mon Sep 17 00:00:00 2001
From: Tagir Valeev <Tagir.Valeev@jetbrains.com>
Date: Mon, 18 Mar 2019 15:45:22 +0700
Subject: [PATCH] CommonDataflow#getExpressionRange contract

---
 .../com/intellij/codeInspection/dataFlow/CommonDataflow.java    | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/CommonDataflow.java b/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/CommonDataflow.java
index 39fc2609dbb2..9ea2a9672710 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/CommonDataflow.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/CommonDataflow.java
@@ -297,8 +297,10 @@ public class CommonDataflow {
    * @param expression expression to get its range
    * @return long range set
    */
+  @Contract("null -> null")
   @Nullable
   public static LongRangeSet getExpressionRange(@Nullable PsiExpression expression) {
+    if (expression == null) return null;
     Object value = ExpressionUtils.computeConstantExpression(expression);
     LongRangeSet rangeSet = LongRangeSet.fromConstant(value);
     if (rangeSet != null) return rangeSet;