rename: do not conflict if class type parameter and type param defined inside class in static context (IDEA-57427)

java/java-impl/src/com/intellij/refactoring/rename/RenameJavaClassProcessor.java

@@ -26,6 +26,7 @@ import com.intellij.psi.search.LocalSearchScope;
 import com.intellij.psi.search.searches.ClassInheritorsSearch;
 import com.intellij.psi.search.searches.ReferencesSearch;
 import com.intellij.psi.util.ClassUtil;
+import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.refactoring.HelpID;
 import com.intellij.refactoring.JavaRefactoringSettings;
 import com.intellij.refactoring.RefactoringBundle;
@@ -33,6 +34,7 @@ import com.intellij.refactoring.listeners.RefactoringElementListener;
 import com.intellij.refactoring.util.MoveRenameUsageInfo;
 import com.intellij.refactoring.util.RefactoringUtil;
 import com.intellij.usageView.UsageInfo;
+import com.intellij.util.ArrayUtil;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.containers.MultiMap;
 import org.jetbrains.annotations.NonNls;
@@ -176,6 +178,15 @@ public class RenameJavaClassProcessor extends RenamePsiElementProcessor {
       final PsiResolveHelper resolveHelper = JavaPsiFacade.getInstance(referenceElement.getProject()).getResolveHelper();
       final PsiClass aClass = resolveHelper.resolveReferencedClass(newName, referenceElement);
       if (aClass == null) return;
+      if (aClass instanceof PsiTypeParameter && myRenamedClass instanceof PsiTypeParameter) {
+        final PsiTypeParameterListOwner member = PsiTreeUtil.getParentOfType(referenceElement, PsiTypeParameterListOwner.class);
+        if (member != null) {
+          final PsiTypeParameterList typeParameterList = member.getTypeParameterList();
+          if (typeParameterList != null && ArrayUtil.find(typeParameterList.getTypeParameters(), myRenamedClass) > -1) {
+            if (member.hasModifierProperty(PsiModifier.STATIC)) return;
+          }
+        }
+      }
       final PsiFile containingFile = referenceElement.getContainingFile();
       final String text = referenceElement.getText();
       if (Comparing.equal(myRenamedClassQualifiedName, removeSpaces(text))) return;

java/java-tests/testData/refactoring/renameCollisions/RenameStaticMethodTypeParameter.java

@@ -0,0 +1,7 @@
+public class Holder<E> {
+  private final E elem;
+
+  private Holder(E elem) { this.elem = elem; }
+
+  public static <<caret>X> Holder<X> of(X elem) { return new Holder<X>(elem); }
+}

java/java-tests/testData/refactoring/renameCollisions/RenameStaticMethodTypeParameter.java.after

@@ -0,0 +1,7 @@
+public class Holder<E> {
+  private final E elem;
+
+  private Holder(E elem) { this.elem = elem; }
+
+  public static <E> Holder<E> of(E elem) { return new Holder<E>(elem); }
+}

java/java-tests/testSrc/com/intellij/refactoring/RenameCollisionsTest.java

@@ -169,6 +169,10 @@ public class RenameCollisionsTest extends LightCodeInsightTestCase {
     doTest("C");
   }
 
+  public void testRenameStaticMethodTypeParameter() throws Exception {
+    doTest("E");
+  }
+
   private void doTest(final String newName) throws Exception {
     configureByFile(BASE_PATH + getTestName(false) + ".java");
     PsiElement element = TargetElementUtilBase