Refactor: extract duplicated logic to util class

Introduce PackageIndexUtil

idea/src/org/jetbrains/jet/plugin/caches/resolve/IDELightClassGenerationSupport.java

@@ -16,7 +16,6 @@
 
 package org.jetbrains.jet.plugin.caches.resolve;
 
-import com.google.common.collect.Sets;
 import com.intellij.openapi.components.ServiceManager;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.project.Project;
@@ -40,13 +39,13 @@ import org.jetbrains.jet.lang.resolve.lazy.ForceResolveUtil;
 import org.jetbrains.jet.lang.resolve.lazy.KotlinCodeAnalyzer;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.Name;
-import org.jetbrains.jet.lang.resolve.name.NamePackage;
 import org.jetbrains.jet.plugin.libraries.JetSourceNavigationHelper;
 import org.jetbrains.jet.plugin.project.AnalyzerFacadeWithCache;
 import org.jetbrains.jet.plugin.project.ResolveSessionForBodies;
 import org.jetbrains.jet.plugin.stubindex.JetAllPackagesIndex;
 import org.jetbrains.jet.plugin.stubindex.JetClassByPackageIndex;
 import org.jetbrains.jet.plugin.stubindex.JetFullClassNameIndex;
+import org.jetbrains.jet.plugin.stubindex.PackageIndexUtil;
 
 import java.util.*;
 
@@ -169,13 +168,7 @@ public class IDELightClassGenerationSupport extends LightClassGenerationSupport
     @NotNull
     @Override
     public Collection<JetFile> findFilesForPackage(@NotNull final FqName fqName, @NotNull GlobalSearchScope searchScope) {
-        Collection<JetFile> files = JetAllPackagesIndex.getInstance().get(fqName.asString(), project, kotlinSources(searchScope));
-        return ContainerUtil.filter(files, new Condition<JetFile>() {
-            @Override
-            public boolean value(JetFile file) {
-                return fqName.equals(JetPsiUtil.getFQName(file));
-            }
-        });
+        return PackageIndexUtil.findFilesWithExactPackage(fqName, kotlinSources(searchScope), project);
     }
 
     @NotNull
@@ -194,22 +187,7 @@ public class IDELightClassGenerationSupport extends LightClassGenerationSupport
     @NotNull
     @Override
     public Collection<FqName> getSubPackages(@NotNull FqName fqn, @NotNull GlobalSearchScope scope) {
-        Collection<JetFile> files = JetAllPackagesIndex.getInstance().get(fqn.asString(), project, kotlinSources(scope));
-
-        Set<FqName> result = Sets.newHashSet();
-        for (JetFile file : files) {
-            FqName fqName = JetPsiUtil.getFQName(file);
-
-            assert NamePackage.isSubpackageOf(fqName, fqn) : "Registered package is not a subpackage of actually declared package:\n" +
-                                                             "in index: " + fqn + "\n" +
-                                                             "declared: " + fqName;
-            FqName subpackage = NamePackage.plusOneSegment(fqn, fqName);
-            if (subpackage != null) {
-                result.add(subpackage);
-            }
-        }
-
-        return result;
+        return PackageIndexUtil.getSubPackageFqNames(fqn, kotlinSources(scope), project);
     }
 
     @Nullable

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

@@ -0,0 +1,76 @@
+/*
+ * 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.google.common.collect.Sets;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.Condition;
+import com.intellij.psi.search.GlobalSearchScope;
+import com.intellij.util.containers.ContainerUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.psi.JetFile;
+import org.jetbrains.jet.lang.psi.JetPsiUtil;
+import org.jetbrains.jet.lang.resolve.name.FqName;
+import org.jetbrains.jet.lang.resolve.name.NamePackage;
+
+import java.util.Collection;
+import java.util.Set;
+
+public final class PackageIndexUtil {
+    @NotNull
+    public static Collection<FqName> getSubPackageFqNames(
+            @NotNull FqName packageFqName,
+            @NotNull GlobalSearchScope scope,
+            @NotNull Project project
+    ) {
+        Collection<JetFile> files = JetAllPackagesIndex.getInstance().get(packageFqName.asString(), project, scope);
+
+        Set<FqName> result = Sets.newHashSet();
+        for (JetFile file : files) {
+            FqName fqName = JetPsiUtil.getFQName(file);
+
+            assert NamePackage.isSubpackageOf(fqName, packageFqName) :
+                    "Registered package is not a subpackage of actually declared package:\n" +
+                    "in index: " + packageFqName + "\n" +
+                    "declared: " + fqName;
+            FqName subpackage = NamePackage.plusOneSegment(packageFqName, fqName);
+            if (subpackage != null) {
+                result.add(subpackage);
+            }
+        }
+
+        return result;
+    }
+
+    @NotNull
+    public static Collection<JetFile> findFilesWithExactPackage(
+            @NotNull final FqName packageFqName,
+            @NotNull GlobalSearchScope searchScope,
+            @NotNull Project project
+    ) {
+        Collection<JetFile> files = JetAllPackagesIndex.getInstance().get(packageFqName.asString(), project, searchScope);
+        return ContainerUtil.filter(files, new Condition<JetFile>() {
+            @Override
+            public boolean value(JetFile file) {
+                return packageFqName.equals(JetPsiUtil.getFQName(file));
+            }
+        });
+    }
+
+    private PackageIndexUtil() {
+    }
+}

idea/src/org/jetbrains/jet/plugin/stubindex/resolve/StubBasedPackageMemberDeclarationProvider.kt

@@ -31,6 +31,7 @@ import org.jetbrains.jet.plugin.stubindex.JetTopLevelPropertiesFqnNameIndex
 import java.util.*
 import org.jetbrains.jet.plugin.stubindex.JetSourceFilterScope.kotlinSources
 import org.jetbrains.jet.lang.resolve.name.numberOfSegments
+import org.jetbrains.jet.plugin.stubindex.PackageIndexUtil
 
 public class StubBasedPackageMemberDeclarationProvider(
         private val fqName: FqName,
@@ -59,12 +60,7 @@ public class StubBasedPackageMemberDeclarationProvider(
     }
 
     override fun getAllDeclaredSubPackages(): Collection<FqName> {
-        //TODO: duplication with light class generation support
-        val allPackagesInProject = JetAllPackagesIndex.getInstance().getAllKeys(project)
-        return allPackagesInProject.filter {
-            val otherPackageFqName = FqName(it)
-            !otherPackageFqName.isRoot() && otherPackageFqName.parent() == fqName
-        }.map { FqName(it) }
+        return PackageIndexUtil.getSubPackageFqNames(fqName, searchScope, project)
     }
 
     override fun getPackageDeclarations(fqName: FqName): Collection<NavigatablePsiElement> {
@@ -80,11 +76,7 @@ public class StubBasedPackageMemberDeclarationProvider(
     }
 
     override fun getPackageFiles(): Collection<JetFile> {
-        //TODO: duplicate with light class generation support
-        val files = JetAllPackagesIndex.getInstance().get(fqName.asString(), project, kotlinSources(searchScope))
-        return files.filter {
-            fqName.equals(JetPsiUtil.getFQName(it))
-        }
+       return PackageIndexUtil.findFilesWithExactPackage(fqName, searchScope, project)
     }
 
     private fun childName(name: Name): String {