Minor: Convert PackageIndexUtil to Kotlin

annotations/com/intellij/psi/stubs/annotations.xml

@@ -10,7 +10,10 @@
       name='com.intellij.psi.stubs.AbstractStubIndex java.util.Collection<Psi> get(Key, com.intellij.openapi.project.Project, com.intellij.psi.search.GlobalSearchScope) 2'>
     <annotation name='org.jetbrains.annotations.NotNull'/>
   </item>
-  <item
+    <item name='com.intellij.psi.stubs.StubIndex com.intellij.psi.stubs.StubIndex getInstance()'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
+    <item
       name='com.intellij.psi.stubs.StubIndex java.util.Collection&lt;Psi&gt; get(com.intellij.psi.stubs.StubIndexKey&lt;Key,Psi&gt;, Key, com.intellij.openapi.project.Project, com.intellij.psi.search.GlobalSearchScope)'>
     <annotation name='org.jetbrains.annotations.NotNull'/>
   </item>

idea/idea-analysis/src/org/jetbrains/jet/plugin/stubindex/PackageIndexUtil.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2010-2014 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.
+ * 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.openapi.util.Ref
+import com.intellij.psi.search.GlobalSearchScope
+import com.intellij.psi.stubs.StubIndex
+import com.intellij.psi.stubs.StubIndexKey
+import com.intellij.util.Processor
+import org.jetbrains.jet.lang.psi.JetFile
+import org.jetbrains.jet.lang.resolve.name.FqName
+import kotlin.platform.platformStatic
+
+public object PackageIndexUtil {
+    platformStatic public fun getSubPackageFqNames(
+            packageFqName: FqName,
+            scope: GlobalSearchScope,
+            project: Project
+    ): Collection<FqName> {
+        return SubpackagesIndexService.getInstance(project).getSubpackages(packageFqName, scope)
+    }
+
+    platformStatic public fun findFilesWithExactPackage(
+            packageFqName: FqName,
+            searchScope: GlobalSearchScope,
+            project: Project
+    ): Collection<JetFile> {
+        return JetExactPackagesIndex.getInstance().get(packageFqName.asString(), project, searchScope)
+    }
+
+    platformStatic public fun packageExists(
+            packageFqName: FqName,
+            searchScope: GlobalSearchScope,
+            project: Project
+    ): Boolean {
+        return containsAny(packageFqName, searchScope, project, JetExactPackagesIndex.getInstance().getKey()) ||
+               SubpackagesIndexService.getInstance(project).hasSubpackages(packageFqName, searchScope)
+    }
+
+    platformStatic public fun containsAny(
+            packageFqName: FqName,
+            searchScope: GlobalSearchScope,
+            project: Project,
+            key: StubIndexKey<String, JetFile>
+    ): Boolean {
+        var result = false
+        StubIndex.getInstance().processElements<String, JetFile>(key, packageFqName.asString(), project, searchScope, javaClass<JetFile>()) {
+            result = true
+            false
+        }
+        return result
+    }
+}