Index classes by containing package

idea/src/META-INF/plugin.xml

@@ -204,6 +204,7 @@
 
       <stubElementTypeHolder class="org.jetbrains.jet.lang.psi.stubs.elements.JetStubElementTypes"/>
       <stubIndex implementation="org.jetbrains.jet.plugin.stubindex.JetPackageDeclarationIndex"/>
+      <stubIndex implementation="org.jetbrains.jet.plugin.stubindex.JetClassByPackageIndex"/>
       <stubIndex implementation="org.jetbrains.jet.plugin.stubindex.JetShortClassNameIndex"/>
       <stubIndex implementation="org.jetbrains.jet.plugin.stubindex.JetFullClassNameIndex"/>
       <stubIndex implementation="org.jetbrains.jet.plugin.stubindex.JetShortFunctionNameIndex"/>

idea/src/org/jetbrains/jet/plugin/stubindex/JetClassByPackageIndex.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010-2013 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.plugin.stubindex;
+
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.search.GlobalSearchScope;
+import com.intellij.psi.stubs.StringStubIndexExtension;
+import com.intellij.psi.stubs.StubIndexKey;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.psi.JetClassOrObject;
+
+import java.util.Collection;
+
+public class JetClassByPackageIndex extends StringStubIndexExtension<JetClassOrObject> {
+    private static final StubIndexKey<String, JetClassOrObject> KEY = KotlinIndexUtil.createIndexKey(JetClassByPackageIndex.class);
+
+    private static final JetClassByPackageIndex ourInstance = new JetClassByPackageIndex();
+
+    public static JetClassByPackageIndex getInstance() {
+        return ourInstance;
+    }
+
+    private JetClassByPackageIndex() {}
+
+    @NotNull
+    @Override
+    public StubIndexKey<String, JetClassOrObject> getKey() {
+        return KEY;
+    }
+
+    @Override
+    public Collection<JetClassOrObject> get(final String fqName, final Project project, @NotNull final GlobalSearchScope scope) {
+        return super.get(fqName, project, new JetSourceFilterScope(scope));
+    }
+}

idea/src/org/jetbrains/jet/plugin/stubindex/StubIndexServiceImpl.java

@@ -17,6 +17,7 @@
 package org.jetbrains.jet.plugin.stubindex;
 
 import com.intellij.psi.stubs.IndexSink;
+import com.intellij.psi.stubs.StubElement;
 import org.jetbrains.jet.lang.psi.stubs.*;
 import org.jetbrains.jet.lang.psi.stubs.elements.StubIndexService;
 import org.jetbrains.jet.lang.resolve.name.FqName;
@@ -44,6 +45,15 @@ public class StubIndexServiceImpl implements StubIndexService {
         for (String superName : stub.getSuperNames()) {
             sink.occurrence(JetSuperClassIndex.getInstance().getKey(), superName);
         }
+
+        StubElement parentStub = stub.getParentStub();
+        if (parentStub instanceof PsiJetFileStub) {
+            PsiJetFileStub jetFileStub = (PsiJetFileStub) parentStub;
+            String packageName = jetFileStub.getPackageName();
+            if (packageName != null) {
+                sink.occurrence(JetClassByPackageIndex.getInstance().getKey(), packageName);
+            }
+        }
     }
 
     @Override