Refactoring - new interface for common method

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetClassBody.java

@@ -30,11 +30,13 @@ import java.util.List;
 /**
  * @author max
  */
-public class JetClassBody extends JetElement {
+public class JetClassBody extends JetElement implements JetDeclarationContainer {
     public JetClassBody(@NotNull ASTNode node) {
         super(node);
     }
 
+    @Override
+    @NotNull
     public List<JetDeclaration> getDeclarations() {
         return PsiTreeUtil.getChildrenOfTypeAsList(this, JetDeclaration.class);
     }

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetClassOrObject.java

@@ -26,9 +26,7 @@ import java.util.List;
 /**
  * @author max
  */
-public interface JetClassOrObject extends PsiElement, PsiNameIdentifierOwner {
-    List<JetDeclaration> getDeclarations();
-
+public interface JetClassOrObject extends PsiElement, PsiNameIdentifierOwner, JetDeclarationContainer {
     @Nullable
     JetDelegationSpecifierList getDelegationSpecifierList();
 

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetDeclarationContainer.java

@@ -0,0 +1,29 @@
+/*
+ * 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.psi;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * @author Nikolay Krasko
+ */
+public interface JetDeclarationContainer {
+    @NotNull
+    List<JetDeclaration> getDeclarations();
+}

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetFile.java

@@ -33,11 +33,12 @@ import org.jetbrains.jet.plugin.JetLanguage;
 
 import java.util.List;
 
-public class JetFile extends PsiFileBase {
+public class JetFile extends PsiFileBase implements JetDeclarationContainer {
     public JetFile(FileViewProvider viewProvider) {
         super(viewProvider, JetLanguage.INSTANCE);
     }
 
+    @Override
     @NotNull
     public FileType getFileType() {
         return JetFileType.INSTANCE;
@@ -48,6 +49,8 @@ public class JetFile extends PsiFileBase {
         return "JetFile: " + getName();
     }
 
+    @NotNull
+    @Override
     public List<JetDeclaration> getDeclarations() {
         return PsiTreeUtil.getChildrenOfTypeAsList(this, JetDeclaration.class);
     }

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetNamespaceBody.java

@@ -25,11 +25,13 @@ import java.util.List;
 /**
  * @author max
  */
-public class JetNamespaceBody extends JetElement {
+public class JetNamespaceBody extends JetElement implements JetDeclarationContainer {
     public JetNamespaceBody(@NotNull ASTNode node) {
         super(node);
     }
 
+    @NotNull
+    @Override
     public List<JetDeclaration> getDeclarations() {
         return PsiTreeUtil.getChildrenOfTypeAsList(this, JetDeclaration.class);
     }