IDEA-119272 Groovy: don't duplicate @Nullable in implemented methods

plugins/groovy/src/org/jetbrains/plugins/groovy/overrideImplement/GroovyOverrideImplementUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -94,18 +94,19 @@ public class GroovyOverrideImplementUtil {
     GrParameter[] parameters = result.getParameters();
     for (int i = 0; i < parameters.length; i++) {
       GrParameter parameter = parameters[i];
-      final PsiParameter original = originalParams[i];
+      PsiParameter original = originalParams[i];
 
       for (PsiAnnotation annotation : original.getModifierList().getAnnotations()) {
         final GrModifierList modifierList = parameter.getModifierList();
 
         String qname = annotation.getQualifiedName();
-
-        if (annotation instanceof GrAnnotation) {
-          modifierList.add(annotation);
-        }
-        else {
-          modifierList.add(factory.createAnnotationFromText(annotation.getText()));
+        if (qname != null && modifierList.findAnnotation(qname) == null) {
+          if (annotation instanceof GrAnnotation) {
+            modifierList.add(annotation);
+          }
+          else {
+            modifierList.add(factory.createAnnotationFromText(annotation.getText()));
+          }
         }
       }
     }

plugins/groovy/src/org/jetbrains/plugins/groovy/overrideImplement/GroovyOverrideMethodsHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 package org.jetbrains.plugins.groovy.overrideImplement;
 
 import com.intellij.codeInsight.CodeInsightUtilBase;
+import com.intellij.codeInsight.generation.OverrideImplementExploreUtil;
 import com.intellij.codeInsight.generation.OverrideImplementUtil;
 import com.intellij.codeInsight.hint.HintManager;
 import com.intellij.lang.LanguageCodeInsightActionHandler;
@@ -40,7 +41,7 @@ public class GroovyOverrideMethodsHandler implements LanguageCodeInsightActionHa
     PsiClass aClass = OverrideImplementUtil.getContextClass(project, editor, file, true);
     if (aClass == null) return;
 
-    if (OverrideImplementUtil.getMethodSignaturesToOverride(aClass).isEmpty()) {
+    if (OverrideImplementExploreUtil.getMethodSignaturesToOverride(aClass).isEmpty()) {
       HintManager.getInstance().showErrorHint(editor, "No methods to override have been found");
       return;
     }

plugins/groovy/test/org/jetbrains/plugins/groovy/lang/overriding/GroovyOverrideImplementTest.groovy

@@ -100,7 +100,7 @@ class Test<T> extends Base<T> {
   }
 
   void testTrhowsList() {
-    myFixture.configureByText('a.groovy', '''\
+    assertImplement('''\
 class X implements I {
     <caret>
 }
@@ -108,11 +108,7 @@ class X implements I {
 interface I {
     void foo() throws RuntimeException
 }
-''')
-
-    generateImplementation(findMethod('I', 'foo'))
-
-    myFixture.checkResult('''\
+''', 'I', 'foo', '''\
 class X implements I {
 
     @Override
@@ -127,6 +123,12 @@ interface I {
 ''')
   }
 
+  private void assertImplement(String textBefore, String clazz, String name, String textAfter) {
+    myFixture.configureByText('a.groovy', textBefore)
+    generateImplementation(findMethod(clazz, name))
+    myFixture.checkResult(textAfter)
+  }
+
   void testThrowsListWithImport() {
     myFixture.addClass('''\
 package pack;
@@ -162,6 +164,39 @@ class X implements I {
 ''')
   }
 
+  void testNullableParameter() {
+    myFixture.addClass('''
+package org.jetbrains.annotations;
+public @interface Nullable{}
+''')
+
+    assertImplement('''
+import org.jetbrains.annotations.Nullable
+
+class Inheritor implements I {
+  <caret>
+}
+
+interface I {
+  def foo(@Nullable p)
+}
+''', 'I', 'foo', '''
+import org.jetbrains.annotations.Nullable
+
+class Inheritor implements I {
+
+    @Override
+    def foo(@Nullable Object p) {
+        <caret>return null
+    }
+}
+
+interface I {
+  def foo(@Nullable p)
+}
+''')
+  }
+
   public void _testImplementIntention() {
     myFixture.configureByText('a.groovy', '''
 class Base<E> {