Remove FqNameBase, simplify FqName and FqNameUnsafe

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/sam/SingleAbstractMethodUtils.java

@@ -312,7 +312,7 @@ public class SingleAbstractMethodUtils {
     @Nullable
     public static JavaMethod getSamInterfaceMethod(@NotNull JavaClass javaClass) {
         FqName fqName = javaClass.getFqName();
-        if (fqName == null || fqName.firstSegmentIs(KotlinBuiltIns.BUILT_INS_PACKAGE_NAME)) {
+        if (fqName == null || fqName.toUnsafe().startsWith(KotlinBuiltIns.BUILT_INS_PACKAGE_NAME)) {
             return null;
         }
         if (!javaClass.isInterface() || javaClass.isAnnotationType()) {

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/specialBuiltinMembers.kt

@@ -19,21 +19,21 @@ package org.jetbrains.kotlin.load.java
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.load.java.BuiltinMethodsWithSpecialGenericSignature.getSpecialSignatureInfo
+import org.jetbrains.kotlin.load.java.BuiltinMethodsWithSpecialGenericSignature.sameAsBuiltinMethodWithErasedValueParameters
+import org.jetbrains.kotlin.load.java.BuiltinSpecialProperties.getBuiltinSpecialPropertyGetterName
 import org.jetbrains.kotlin.load.java.descriptors.JavaCallableMemberDescriptor
 import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
+import org.jetbrains.kotlin.types.checker.TypeCheckingProcedure
 import org.jetbrains.kotlin.utils.DFS
 import org.jetbrains.kotlin.utils.addToStdlib.check
-import org.jetbrains.kotlin.load.java.BuiltinSpecialProperties.getBuiltinSpecialPropertyGetterName
-import org.jetbrains.kotlin.load.java.BuiltinMethodsWithSpecialGenericSignature.sameAsBuiltinMethodWithErasedValueParameters
-import org.jetbrains.kotlin.load.java.BuiltinMethodsWithSpecialGenericSignature.getSpecialSignatureInfo
-import org.jetbrains.kotlin.resolve.DescriptorUtils
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
-import org.jetbrains.kotlin.types.checker.TypeCheckingProcedure
 
 object BuiltinSpecialProperties {
     private val PROPERTY_FQ_NAME_TO_JVM_GETTER_NAME_MAP = mapOf(
@@ -260,8 +260,9 @@ private val CallableMemberDescriptor.isFromJava: Boolean
     get() = propertyIfAccessor is JavaCallableMemberDescriptor && propertyIfAccessor.containingDeclaration is JavaClassDescriptor
 
 private fun CallableMemberDescriptor.isFromBuiltins(): Boolean {
-    if (!(propertyIfAccessor.fqNameOrNull()?.firstSegmentIs(KotlinBuiltIns.BUILT_INS_PACKAGE_NAME) ?: false)) return false
-    return builtIns.builtInsModule == module
+    val fqName = propertyIfAccessor.fqNameOrNull() ?: return false
+    return fqName.toUnsafe().startsWith(KotlinBuiltIns.BUILT_INS_PACKAGE_NAME) &&
+            this.module == this.builtIns.builtInsModule
 }
 
 private val CallableMemberDescriptor.propertyIfAccessor: CallableMemberDescriptor

core/descriptors/src/org/jetbrains/kotlin/name/FqName.java

@@ -22,7 +22,7 @@ import org.jetbrains.kotlin.utils.StringsKt;
 import java.util.ArrayList;
 import java.util.List;
 
-public final class FqName extends FqNameBase {
+public final class FqName {
 
     @NotNull
     public static FqName fromSegments(@NotNull List<String> names) {
@@ -55,7 +55,6 @@ public final class FqName extends FqNameBase {
         return qualifiedName.indexOf('<') < 0;
     }
 
-    @Override
     @NotNull
     public String asString() {
         return fqName.asString();
@@ -95,7 +94,6 @@ public final class FqName extends FqNameBase {
         return fqName.shortName();
     }
 
-    @Override
     @NotNull
     public Name shortNameOrSpecial() {
         return fqName.shortNameOrSpecial();
@@ -115,20 +113,11 @@ public final class FqName extends FqNameBase {
         return path;
     }
 
-    @Override
     @NotNull
     public List<Name> pathSegments() {
         return fqName.pathSegments();
     }
 
-    public boolean firstSegmentIs(@NotNull Name segment) {
-        return fqName.firstSegmentIs(segment);
-    }
-
-    public boolean lastSegmentIs(@NotNull Name segment) {
-        return fqName.lastSegmentIs(segment);
-    }
-
     public boolean isAncestorOf(@NotNull FqName other) {
         String thisString = this.asString();
         String otherString = other.asString();
@@ -140,7 +129,6 @@ public final class FqName extends FqNameBase {
         return new FqName(FqNameUnsafe.topLevel(shortName));
     }
 
-
     @Override
     public String toString() {
         return fqName.toString();

core/descriptors/src/org/jetbrains/kotlin/name/FqNameBase.java

@@ -1,61 +0,0 @@
-/*
- * Copyright 2010-2015 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.kotlin.name;
-
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-
-public abstract class FqNameBase {
-
-    protected FqNameBase() {
-        if (!(this instanceof FqName || this instanceof FqNameUnsafe)) {
-            throw new AssertionError("do not use this class directly");
-        }
-    }
-
-    @NotNull
-    protected abstract String asString();
-
-    @NotNull
-    private FqNameUnsafe toFqNameUnsafe() {
-        if (this instanceof FqName) {
-            return ((FqName) this).toUnsafe();
-        }
-        else if (this instanceof FqNameUnsafe) {
-            return ((FqNameUnsafe) this);
-        }
-        else {
-            throw new AssertionError();
-        }
-    }
-
-    public final boolean equalsTo(@Nullable FqName that) {
-        return that != null && equalsTo(that.toUnsafe());
-    }
-
-    public final boolean equalsTo(@Nullable FqNameUnsafe that) {
-        return toFqNameUnsafe().equals(that);
-    }
-
-    @NotNull
-    public abstract Name shortNameOrSpecial();
-
-    @NotNull
-    public abstract List<Name> pathSegments();
-}

core/descriptors/src/org/jetbrains/kotlin/name/FqNameUnsafe.java

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.name;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.jetbrains.kotlin.utils.StringsKt;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -26,7 +25,7 @@ import java.util.List;
 /**
  * Like {@link FqName} but allows '<' and '>' characters in name.
  */
-public final class FqNameUnsafe extends FqNameBase {
+public final class FqNameUnsafe {
 
     public static final Name ROOT_NAME = Name.special("<root>");
 
@@ -70,9 +69,6 @@ public final class FqNameUnsafe extends FqNameBase {
         }
     }
 
-
-
-    @Override
     @NotNull
     public String asString() {
         return fqName;
@@ -140,7 +136,6 @@ public final class FqNameUnsafe extends FqNameBase {
         return shortName;
     }
 
-    @Override
     @NotNull
     public Name shortNameOrSpecial() {
         if (isRoot()) {
@@ -168,7 +163,6 @@ public final class FqNameUnsafe extends FqNameBase {
         return path;
     }
 
-    @Override
     @NotNull
     public List<Name> pathSegments() {
         final List<Name> path = new ArrayList<Name>();
@@ -181,7 +175,6 @@ public final class FqNameUnsafe extends FqNameBase {
         return path;
     }
 
-
     void walk(@NotNull WalkCallback callback) {
         if (isRoot()) {
             return;
@@ -226,33 +219,15 @@ public final class FqNameUnsafe extends FqNameBase {
         }
     }
 
-    public boolean firstSegmentIs(@NotNull Name segment) {
-        if (isRoot()) {
-            return false;
-        }
-        List<Name> pathSegments = pathSegments();
-        return pathSegments.get(0).equals(segment);
+    public boolean startsWith(@NotNull Name segment) {
+        return !isRoot() && pathSegments().get(0).equals(segment);
     }
 
-    public boolean lastSegmentIs(@NotNull Name segment) {
-        if (isRoot()) {
-            return false;
-        }
-        return shortName().equals(segment);
-    }
-
-    @NotNull
-    public static FqNameUnsafe fromSegments(@NotNull List<?> names) {
-        return new FqNameUnsafe(StringsKt.join(names, "."));
-    }
-
-
     @NotNull
     public static FqNameUnsafe topLevel(@NotNull Name shortName) {
         return new FqNameUnsafe(shortName.asString(), FqName.ROOT.toUnsafe(), shortName);
     }
 
-
     @Override
     @NotNull
     public String toString() {

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRenderer.kt

@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationUseSiteTarget
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.name.FqNameBase
+import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeConstructor
@@ -55,7 +55,7 @@ public abstract class DescriptorRenderer : Renderer<DeclarationDescriptor> {
 
     public abstract fun renderName(name: Name): String
 
-    public abstract fun renderFqName(fqName: FqNameBase): String
+    public abstract fun renderFqName(fqName: FqNameUnsafe): String
 
     public interface ValueParametersHandler {
         public fun appendBeforeValueParameters(parameterCount: Int, builder: StringBuilder)

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotated
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationUseSiteTarget
-import org.jetbrains.kotlin.name.FqNameBase
+import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.resolve.DescriptorUtils
@@ -111,7 +111,7 @@ internal class DescriptorRendererImpl(
         }
     }
 
-    override fun renderFqName(fqName: FqNameBase) = renderFqName(fqName.pathSegments())
+    override fun renderFqName(fqName: FqNameUnsafe) = renderFqName(fqName.pathSegments())
 
     private fun renderFqName(pathSegments: List<Name>) = escape(org.jetbrains.kotlin.renderer.renderFqName(pathSegments))
 
@@ -836,7 +836,7 @@ internal class DescriptorRendererImpl(
 
     private fun renderPackageView(packageView: PackageViewDescriptor, builder: StringBuilder) {
         builder.append(renderKeyword("package")).append(" ")
-        builder.append(renderFqName(packageView.fqName))
+        builder.append(renderFqName(packageView.fqName.toUnsafe()))
         if (debugMode) {
             builder.append(" in context of ")
             renderName(packageView.module, builder)
@@ -845,7 +845,7 @@ internal class DescriptorRendererImpl(
 
     private fun renderPackageFragment(fragment: PackageFragmentDescriptor, builder: StringBuilder) {
         builder.append(renderKeyword("package-fragment")).append(" ")
-        builder.append(renderFqName(fragment.fqName))
+        builder.append(renderFqName(fragment.fqName.toUnsafe()))
         if (debugMode) {
             builder.append(" in ")
             renderName(fragment.getContainingDeclaration(), builder)

core/descriptors/src/org/jetbrains/kotlin/renderer/RenderingUtils.kt

@@ -17,7 +17,7 @@
 package org.jetbrains.kotlin.renderer
 
 import org.jetbrains.kotlin.descriptors.*
-import org.jetbrains.kotlin.name.FqNameBase
+import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
 
 public fun qualifiedNameForSourceCode(descriptor: ClassifierDescriptor): String {
@@ -31,7 +31,7 @@ public fun qualifiedNameForSourceCode(descriptor: ClassifierDescriptor): String
 
 private fun qualifierName(descriptor: DeclarationDescriptor): String? = when (descriptor) {
     is ClassDescriptor -> qualifiedNameForSourceCode(descriptor)
-    is PackageFragmentDescriptor -> descriptor.fqName.render()
+    is PackageFragmentDescriptor -> descriptor.fqName.toUnsafe().render()
     else -> null
 }
 
@@ -47,18 +47,18 @@ private fun Name.shouldBeEscaped(): Boolean {
     return string in KeywordStringsGenerated.KEYWORDS || string.any { !Character.isLetterOrDigit(it) && it != '_' }
 }
 
-public fun FqNameBase.render(): String {
+public fun FqNameUnsafe.render(): String {
     return renderFqName(pathSegments())
 }
 
 public fun renderFqName(pathSegments: List<Name>): String {
-    return StringBuilder {
+    return buildString {
         for (element in pathSegments) {
-            if (length() > 0) {
+            if (length > 0) {
                 append(".")
             }
             append(element.render())
         }
-    }.toString()
+    }
 }
 

core/descriptors/src/org/jetbrains/kotlin/resolve/ImportPath.java

@@ -51,7 +51,7 @@ public final class ImportPath {
     }
 
     public String getPathStr() {
-        return RenderingUtilsKt.render(fqName) + (isAllUnder ? ".*" : "");
+        return RenderingUtilsKt.render(fqName.toUnsafe()) + (isAllUnder ? ".*" : "");
     }
 
     @Override

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedAnnotations.kt

@@ -44,7 +44,7 @@ open class DeserializedAnnotationsWithPossibleTargets(
         annotationWithTarget ->
         if (annotationWithTarget.target != null) return@firstOrNull false
         val descriptor = annotationWithTarget.annotation.type.constructor.declarationDescriptor
-        descriptor is ClassDescriptor && fqName.equalsTo(DescriptorUtils.getFqName(descriptor))
+        descriptor is ClassDescriptor && fqName.toUnsafe() == DescriptorUtils.getFqName(descriptor)
     }?.annotation
 
     override fun findExternalAnnotation(fqName: FqName) = null

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/stubBuilder/clsStubBuilding.kt

@@ -106,7 +106,7 @@ private fun setupFileStub(fileStub: KotlinFileStubImpl, packageFqName: FqName) {
 
 fun createStubForPackageName(packageDirectiveStub: KotlinPlaceHolderStubImpl<KtPackageDirective>, packageFqName: FqName) {
     val segments = packageFqName.pathSegments().toArrayList()
-    val iterator = segments.listIterator(segments.size())
+    val iterator = segments.listIterator(segments.size)
 
     fun recCreateStubForPackageName(current: StubElement<out PsiElement>) {
         when (iterator.previousIndex()) {
@@ -130,10 +130,10 @@ fun createStubForPackageName(packageDirectiveStub: KotlinPlaceHolderStubImpl<KtP
 fun createStubForTypeName(typeClassId: ClassId, parent: StubElement<out PsiElement>): KotlinUserTypeStub {
     val fqName =
             if (typeClassId.isLocal()) KotlinBuiltIns.FQ_NAMES.any
-            else typeClassId.asSingleFqName()
+            else typeClassId.asSingleFqName().toUnsafe()
     val segments = fqName.pathSegments().toArrayList()
     assert(segments.isNotEmpty())
-    val iterator = segments.listIterator(segments.size())
+    val iterator = segments.listIterator(segments.size)
 
     fun recCreateStubForType(current: StubElement<out PsiElement>): KotlinUserTypeStub {
         val lastSegment = iterator.previous()
@@ -276,7 +276,7 @@ fun createTargetedAnnotationStubs(
                 hasValueArguments = false
         )
         if (target != null) {
-            KotlinAnnotationUseSiteTargetStubImpl(annotationEntryStubImpl, StringRef.fromString(target.name())!!)
+            KotlinAnnotationUseSiteTargetStubImpl(annotationEntryStubImpl, StringRef.fromString(target.name)!!)
         }
         val constructorCallee = KotlinPlaceHolderStubImpl<KtConstructorCalleeExpression>(annotationEntryStubImpl, KtStubElementTypes.CONSTRUCTOR_CALLEE)
         val typeReference = KotlinPlaceHolderStubImpl<KtTypeReference>(constructorCallee, KtStubElementTypes.TYPE_REFERENCE)

idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/renderersUtil.kt

@@ -19,7 +19,6 @@ package org.jetbrains.kotlin.idea.highlighter.renderersUtil
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
-import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.renderer.NameShortness
 import org.jetbrains.kotlin.renderer.RenderingFormat
@@ -112,7 +111,7 @@ fun <D : CallableDescriptor> renderResolvedCall(resolvedCall: ResolvedCall<D>):
         append(" <i>defined in</i> ")
         val containingDeclaration = resultingDescriptor.getContainingDeclaration()
         val fqName = DescriptorUtils.getFqName(containingDeclaration)
-        append(if (FqName.ROOT.equalsTo(fqName)) "root package" else fqName.asString())
+        append(if (fqName.isRoot) "root package" else fqName.asString())
     }
     return stringBuilder.toString()
 }

idea/idea-core/src/org/jetbrains/kotlin/idea/core/util/DescriptorMemberChooserObject.kt

@@ -34,7 +34,7 @@ import org.jetbrains.kotlin.psi.KtNamedDeclaration
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.renderer.NameShortness
 import org.jetbrains.kotlin.renderer.render
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
 import javax.swing.Icon
 
 public open class DescriptorMemberChooserObject(
@@ -75,7 +75,7 @@ public open class DescriptorMemberChooserObject(
 
         public fun getText(descriptor: DeclarationDescriptor): String {
             return if (descriptor is ClassDescriptor)
-                descriptor.fqNameSafe.render()
+                descriptor.fqNameUnsafe.render()
             else
                 MEMBER_RENDERER.render(descriptor)
         }

idea/src/org/jetbrains/kotlin/idea/imports/KotlinImportOptimizer.kt

@@ -211,10 +211,10 @@ public class KotlinImportOptimizer() : ImportOptimizer {
             }
 
             // now check that there are no conflicts and all classes are really imported
-            val fileWithImportsText = StringBuilder {
-                append("package ").append(file.packageFqName.render()).append("\n")
-                importsToGenerate.filter { it.isAllUnder() }.map { "import " + it.pathStr }.joinTo(this, "\n")
-            }.toString()
+            val fileWithImportsText = buildString {
+                append("package ").append(file.packageFqName.toUnsafe().render()).append("\n")
+                importsToGenerate.filter { it.isAllUnder }.map { "import " + it.pathStr }.joinTo(this, "\n")
+            }
             val fileWithImports = KtPsiFactory(file).createAnalyzableFile("Dummy.kt", fileWithImportsText, file)
             val scope = fileWithImports.getResolutionFacade().getFileResolutionScope(fileWithImports)
 

idea/src/org/jetbrains/kotlin/idea/refactoring/jetRefactoringUtil.kt

@@ -72,7 +72,7 @@ import org.jetbrains.kotlin.idea.util.ProjectRootsUtil
 import org.jetbrains.kotlin.idea.util.string.collapseSpaces
 import org.jetbrains.kotlin.j2k.ConverterSettings
 import org.jetbrains.kotlin.j2k.JavaToKotlinConverter
-import org.jetbrains.kotlin.name.FqNameBase
+import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.codeFragmentUtil.suppressDiagnosticsInDebugMode
 import org.jetbrains.kotlin.psi.psiUtil.*
@@ -692,7 +692,7 @@ public fun invokeOnceOnCommandFinish(action: () -> Unit) {
 
 public fun String.quoteIfNeeded(): String = if (KotlinNameSuggester.isIdentifier(this)) this else "`$this`"
 
-public fun FqNameBase.hasIdentifiersOnly(): Boolean = pathSegments().all { KotlinNameSuggester.isIdentifier(it.asString()) }
+public fun FqNameUnsafe.hasIdentifiersOnly(): Boolean = pathSegments().all { KotlinNameSuggester.isIdentifier(it.asString()) }
 
 public fun KtClass.createPrimaryConstructorIfAbsent(): KtPrimaryConstructor {
     val constructor = getPrimaryConstructor()

idea/src/org/jetbrains/kotlin/idea/refactoring/move/changePackage/ChangePackageToMatchDirectoryIntention.kt

@@ -24,14 +24,14 @@ import org.jetbrains.kotlin.idea.intentions.JetSelfTargetingOffsetIndependentInt
 import org.jetbrains.kotlin.psi.KtPackageDirective
 
 public class ChangePackageToMatchDirectoryIntention : JetSelfTargetingOffsetIndependentIntention<KtPackageDirective>(
-        javaClass(), "", "Change file's package to match directory"
+        KtPackageDirective::class.java, "", "Change file's package to match directory"
 ) {
     override fun isApplicableTo(element: KtPackageDirective): Boolean {
         val file = element.getContainingJetFile()
         if (file.packageMatchesDirectory()) return false
 
         val fqNameByDirectory = file.getFqNameByDirectory()
-        if (!fqNameByDirectory.hasIdentifiersOnly()) {
+        if (!fqNameByDirectory.toUnsafe().hasIdentifiersOnly()) {
             if (isIntentionBaseInspectionEnabled(file.project, element)) {
                 text = "File package doesn't match directory"
                 return true
@@ -46,7 +46,7 @@ public class ChangePackageToMatchDirectoryIntention : JetSelfTargetingOffsetInde
     override fun applyTo(element: KtPackageDirective, editor: Editor) {
         val file = element.getContainingJetFile()
         val newFqName = file.getFqNameByDirectory()
-        if (!newFqName.hasIdentifiersOnly()) return
+        if (!newFqName.toUnsafe().hasIdentifiersOnly()) return
         KotlinChangePackageRefactoring(file).run(newFqName)
     }
-}
+}