From 060a76ea6c17a44cbbf5754d84fef483ab40bde1 Mon Sep 17 00:00:00 2001
From: Bas Leijdekkers <basleijdekkers@gmail.com>
Date: Fri, 12 Oct 2018 12:17:49 +0200
Subject: [PATCH] SSR: don't search index for java.lang default package
 (IDEA-200398)

---
 .../matcher/compiler/JavaCompilingVisitor.java   | 16 +++++++++++++++-
 .../OptimizedSearchScanTest.java                 | 16 ++++++++++++----
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/compiler/JavaCompilingVisitor.java b/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/compiler/JavaCompilingVisitor.java
index d0c1bcf02625..71e729473d87 100644
--- a/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/compiler/JavaCompilingVisitor.java
+++ b/java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/compiler/JavaCompilingVisitor.java
@@ -63,10 +63,24 @@ public class JavaCompilingVisitor extends JavaRecursiveElementWalkingVisitor {
 
     @Override
     public void visitReferenceElement(PsiJavaCodeReferenceElement reference) {
-      if (!handleWord(reference.getReferenceName(), myCompilingVisitor.getContext())) return;
+      final String word = reference.getReferenceName();
+      if (!handleWord(word, myCompilingVisitor.getContext())) return;
+      if (reference.isQualified() && isClassFromJavaLangPackage(reference.resolve())) return;
       super.visitReferenceElement(reference);
     }
 
+    private boolean isClassFromJavaLangPackage(PsiElement target) {
+      if (!(target instanceof PsiClass)) {
+        return false;
+      }
+      final PsiFile file = target.getContainingFile();
+      if (!(file instanceof PsiJavaFile)) {
+        return false;
+      }
+      final PsiJavaFile javaFile = (PsiJavaFile)file;
+      return "java.lang".equals(javaFile.getPackageName());
+    }
+
     @Override
     public void visitMethod(PsiMethod method) {
       if (!handleWord(method.getName(), myCompilingVisitor.getContext())) return;
diff --git a/platform/structuralsearch/testSource/com/intellij/structuralsearch/OptimizedSearchScanTest.java b/platform/structuralsearch/testSource/com/intellij/structuralsearch/OptimizedSearchScanTest.java
index aa5e7643569f..3867615bb73c 100644
--- a/platform/structuralsearch/testSource/com/intellij/structuralsearch/OptimizedSearchScanTest.java
+++ b/platform/structuralsearch/testSource/com/intellij/structuralsearch/OptimizedSearchScanTest.java
@@ -22,6 +22,11 @@ public class OptimizedSearchScanTest extends StructuralSearchTestCase {
     return IdeaTestUtil.getMockJdk17();
   }
 
+  private String findWordsToBeUsedWhenSearchingFor(final String s) {
+    findMatchesCount("{}", s);
+    return PatternCompiler.getLastFindPlan();
+  }
+
   public void testClassByQName() {
     final String plan = findWordsToBeUsedWhenSearchingFor("A.f");
     assertEquals("[in code:f][in code:A]", plan);
@@ -95,8 +100,11 @@ public class OptimizedSearchScanTest extends StructuralSearchTestCase {
     assertEquals("non-existing class name should be added to plan", "[in code:enum][in code:Zyxwvuts]", plan2);
   }
 
-  private String findWordsToBeUsedWhenSearchingFor(final String s) {
-    findMatchesCount("{}", s);
-    return PatternCompiler.getLastFindPlan();
-  }
+ public void testQualifiedReference() {
+   final String plan = findWordsToBeUsedWhenSearchingFor("new java.lang.RuntimeException('_x)");
+   assertEquals("[in code:new][in code:RuntimeException]", plan);
+
+   final String plan2 = findWordsToBeUsedWhenSearchingFor("new java.lang.reflect.InvocationTargetException('_x)");
+   assertEquals("[in code:new][in code:InvocationTargetException][in code:reflect][in code:lang][in code:java]", plan2);
+ }
 }