Added PsiAnnotationWithFlags interface uniting JetClassAnnotation and JetMethodAnnotation.

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/kt/JetClassAnnotation.java

@@ -28,7 +28,7 @@ import java.util.BitSet;
 /**
  * @author Stepan Koltsov
  */
-public class JetClassAnnotation extends PsiAnnotationWrapper {
+public class JetClassAnnotation extends PsiAnnotationWithFlags {
 
     public JetClassAnnotation(@Nullable PsiAnnotation psiAnnotation) {
         super(psiAnnotation);
@@ -44,6 +44,7 @@ public class JetClassAnnotation extends PsiAnnotationWrapper {
 
 
     private BitSet flags = null;
+    @NotNull
     public BitSet flags() {
         if (flags == null) {
             flags = BitSetUtils.toBitSet(getIntAttribute(JvmStdlibNames.JET_CLASS_FLAGS_FIELD, JvmStdlibNames.FLAGS_DEFAULT_VALUE));

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/kt/JetMethodAnnotation.java

@@ -28,13 +28,14 @@ import java.util.BitSet;
 /**
  * @author Stepan Koltsov
  */
-public class JetMethodAnnotation extends PsiAnnotationWrapper {
+public class JetMethodAnnotation extends PsiAnnotationWithFlags {
 
     public JetMethodAnnotation(@Nullable PsiAnnotation psiAnnotation) {
         super(psiAnnotation);
     }
     
     private BitSet flags = null;
+    @NotNull
     public BitSet flags() {
         if (flags == null) {
             int flagsValue = getIntAttribute(JvmStdlibNames.JET_METHOD_FLAGS_FIELD, JvmStdlibNames.FLAGS_DEFAULT_VALUE);

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/kt/PsiAnnotationWithFlags.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2010-2012 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.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.lang.resolve.java.kt;
+
+import com.intellij.psi.PsiAnnotation;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.BitSet;
+
+/**
+ * @author Evgeny Gerashchenko
+ * @since 6/14/12
+ */
+public abstract class PsiAnnotationWithFlags extends PsiAnnotationWrapper {
+    protected PsiAnnotationWithFlags(@Nullable PsiAnnotation psiAnnotation) {
+        super(psiAnnotation);
+    }
+
+    @NotNull
+    public abstract BitSet flags();
+}