show conflict on invert boolean and method references (IDEA-112572)

java/java-impl/src/com/intellij/refactoring/invertBoolean/InvertBooleanProcessor.java

@@ -33,6 +33,7 @@ import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.Query;
 import com.intellij.util.containers.HashMap;
 import com.intellij.util.containers.HashSet;
+import com.intellij.util.containers.MultiMap;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
@@ -69,6 +70,18 @@ public class InvertBooleanProcessor extends BaseRefactoringProcessor {
 
   @Override
   protected boolean preprocessUsages(Ref<UsageInfo[]> refUsages) {
+    final MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>();
+    for (UsageInfo info : myToInvert.keySet()) {
+      final PsiElement element = info.getElement();
+      if (element instanceof PsiMethodReferenceExpression) {
+        conflicts.putValue(element, "Method is used in method reference expression");
+      }
+    }
+
+    if (!conflicts.isEmpty())  {
+      return showConflicts(conflicts, null);
+    }
+
     if (myRenameProcessor.preprocessUsages(refUsages)) {
       prepareSuccessful();
       return true;

java/java-tests/testData/refactoring/invertBoolean/methodRefs.java

@@ -0,0 +1,14 @@
+abstract class A{
+    static boolean isB<caret>ool() {
+        return false;
+    }
+    
+    
+    interface I {
+        boolean b();
+    }
+    
+    {
+        I i = A::isBool;
+    }
+}

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

@@ -30,6 +30,15 @@ public class InvertBooleanTest extends LightRefactoringTestCase {
 
   public void testInnerClasses() throws Exception {doTest();}
   public void testAnonymousClasses() throws Exception {doTest();}
+  public void testMethodRefs() throws Exception {
+    try {
+      doTest();
+      fail("Conflict expected.");
+    }
+    catch (BaseRefactoringProcessor.ConflictsInTestsException e) {
+      assertEquals("Method is used in method reference expression", e.getMessage());
+    }
+  }
 
   private void doTest() throws Exception {
     configureByFile(TEST_ROOT + getTestName(true) + ".java");