From 2d52a38a011377903dc0c46c43f2fea87b833323 Mon Sep 17 00:00:00 2001
From: "Ilya.Kazakevich" <Ilya.Kazakevich@jetbrains.com>
Date: Fri, 9 Jun 2017 02:23:00 +0300
Subject: [PATCH] PY-23320: Cache qualified names

---
 .../python/psi/resolve/QualifiedNameFinder.java          | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/python/src/com/jetbrains/python/psi/resolve/QualifiedNameFinder.java b/python/src/com/jetbrains/python/psi/resolve/QualifiedNameFinder.java
index d7aa971e1d88..f444fa1ff017 100644
--- a/python/src/com/jetbrains/python/psi/resolve/QualifiedNameFinder.java
+++ b/python/src/com/jetbrains/python/psi/resolve/QualifiedNameFinder.java
@@ -24,6 +24,9 @@ import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.openapi.vfs.VfsUtilCore;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.psi.*;
+import com.intellij.psi.util.CachedValueProvider.Result;
+import com.intellij.psi.util.CachedValuesManager;
+import com.intellij.psi.util.PsiModificationTracker;
 import com.intellij.psi.util.QualifiedName;
 import com.jetbrains.python.PyNames;
 import com.jetbrains.python.codeInsight.controlflow.ScopeOwner;
@@ -174,6 +177,12 @@ public class QualifiedNameFinder {
 
   @Nullable
   public static String getQualifiedName(@NotNull PyElement element) {
+    return CachedValuesManager.getCachedValue(element, () ->
+      new Result<>(getQualifiedNameInner(element), PsiModificationTracker.MODIFICATION_COUNT));
+  }
+
+  @Nullable
+  private static String getQualifiedNameInner(@NotNull final PyElement element) {
     final String name = element.getName();
     if (name != null) {
       final ScopeOwner owner = ScopeUtil.getScopeOwner(element);