use the deepest super method for completion statistics

java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionStatistician.java

@@ -29,7 +29,7 @@ public class JavaCompletionStatistician extends CompletionStatistician{
 
   @Override
   public StatisticsInfo serialize(final LookupElement element, final CompletionLocation location) {
-    final Object o = element.getObject();
+    Object o = element.getObject();
 
     if (o instanceof PsiLocalVariable || o instanceof PsiParameter || o instanceof PsiThisExpression) {
       return StatisticsInfo.EMPTY;
@@ -47,6 +47,11 @@ public class JavaCompletionStatistician extends CompletionStatistician{
         PsiType expectedType = infos != null && infos.length > 0 ? infos[0].getDefaultType() : null;
         return new StatisticsInfo(JavaStatisticsManager.getAfterNewKey(expectedType), key2);
       }
+
+      if (o instanceof PsiMethod) {
+        o = RecursionWeigher.findDeepestSuper((PsiMethod)o);
+      }
+      
       PsiClass containingClass = ((PsiMember)o).getContainingClass();
       if (containingClass != null) {
         if (CommonClassNames.JAVA_LANG_OBJECT.equals(containingClass.getQualifiedName())) {

java/java-impl/src/com/intellij/codeInsight/completion/RecursionWeigher.java

@@ -197,7 +197,7 @@ class RecursionWeigher extends LookupElementWeigher {
   }
 
   @NotNull
-  private static PsiMethod findDeepestSuper(@NotNull final PsiMethod method) {
+  public static PsiMethod findDeepestSuper(@NotNull final PsiMethod method) {
     final PsiMethod first = DeepestSuperMethodsSearch.search(method).findFirst();
     return first == null ? method : first;
   }

java/java-tests/testData/codeInsight/completion/normalSorting/DeepestSuperMethodStats.java

@@ -0,0 +1,18 @@
+class AbstractSet {
+  public void addX() {}
+  public void addY() {}
+}
+
+class MySet1 extends AbstractSet {
+  public void addX() {}
+}
+class MySet2 extends AbstractSet {
+  public void addX() {}
+}
+
+class Foo {
+  
+  void foo(MySet1 set1, MySet2 set2) {
+    set1.ad<caret>
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionOrderingTest.groovy

@@ -510,6 +510,19 @@ import java.lang.annotation.Target;
     assertPreferredItems 0, 'contains', 'containsAll'
   }
 
+  public void testDeepestSuperMethodStats() {
+    invokeCompletion(getTestName(false) + ".java")
+    assertPreferredItems 0, 'addX', 'addY'
+    myFixture.type('y\n;set1.ad')
+
+    myFixture.completeBasic()
+    assertPreferredItems 0, 'addY', 'addX'
+    myFixture.type('x\n;set2.ad')
+
+    myFixture.completeBasic()
+    assertPreferredItems 0, 'addX', 'addY'
+  }
+
   public void testCommonPrefixMoreImportantThanKind() {
     CodeInsightSettings.getInstance().COMPLETION_CASE_SENSITIVE = CodeInsightSettings.NONE;
     checkPreferredItems(0, 'PsiElement', 'psiElement')