disable replace constructor with builder action for classes without constructors; description

java/java-impl/src/com/intellij/refactoring/actions/ReplaceConstructorWithBuilderAction.java

@@ -21,7 +21,10 @@
 package com.intellij.refactoring.actions;
 
 import com.intellij.openapi.actionSystem.DataContext;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.psi.PsiClass;
 import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
 import com.intellij.refactoring.RefactoringActionHandler;
 import com.intellij.refactoring.replaceConstructorWithBuilder.ReplaceConstructorWithBuilderHandler;
 
@@ -30,6 +33,14 @@ public class ReplaceConstructorWithBuilderAction extends BaseRefactoringAction{
     return true;
   }
 
+  @Override
+  protected boolean isAvailableOnElementInEditorAndFile(PsiElement element, Editor editor, PsiFile file, DataContext context) {
+    final int offset = editor.getCaretModel().getOffset();
+    final PsiElement elementAt = file.findElementAt(offset);
+    final PsiClass psiClass = ReplaceConstructorWithBuilderHandler.getParentNamedClass(elementAt);
+    return psiClass != null && psiClass.getConstructors().length > 0;
+  }
+
   protected boolean isEnabledOnElements(final PsiElement[] elements) {
     return false;
   }

java/java-impl/src/com/intellij/refactoring/replaceConstructorWithBuilder/ReplaceConstructorWithBuilderHandler.java

@@ -51,7 +51,7 @@ public class ReplaceConstructorWithBuilderHandler implements RefactoringActionHa
   }
 
   @Nullable
-  private static PsiClass getParentNamedClass(PsiElement element) {
+  public static PsiClass getParentNamedClass(PsiElement element) {
     final PsiClass psiClass = PsiTreeUtil.getParentOfType(element, PsiClass.class);
     if (psiClass instanceof PsiAnonymousClass) {
       return getParentNamedClass(psiClass);