[Lombok K1] Support @Builder annotation

^KT-46959

plugins/lombok/lombok.common/src/org/jetbrains/kotlin/lombok/utils/LombokNames.kt

@@ -19,6 +19,7 @@ object LombokNames {
     val NO_ARGS_CONSTRUCTOR = FqName("lombok.NoArgsConstructor")
     val ALL_ARGS_CONSTRUCTOR = FqName("lombok.AllArgsConstructor")
     val REQUIRED_ARGS_CONSTRUCTOR = FqName("lombok.RequiredArgsConstructor")
+    val BUILDER = FqName("lombok.Builder")
 
 
     val ACCESSORS_ID = ClassId.topLevel(ACCESSORS)

plugins/lombok/lombok.k1/src/org/jetbrains/kotlin/lombok/LombokSyntheticJavaPartsProvider.kt

@@ -10,6 +10,8 @@ import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.load.java.lazy.LazyJavaResolverContext
+import org.jetbrains.kotlin.load.java.lazy.descriptors.LazyJavaClassDescriptor
+import org.jetbrains.kotlin.load.java.lazy.descriptors.SyntheticJavaClassDescriptor
 import org.jetbrains.kotlin.lombok.config.LombokConfig
 import org.jetbrains.kotlin.lombok.processor.*
 import org.jetbrains.kotlin.lombok.utils.getJavaClass
@@ -30,7 +32,8 @@ class LombokSyntheticJavaPartsProvider(config: LombokConfig) : SyntheticJavaPart
         WithProcessor(),
         NoArgsConstructorProcessor(),
         AllArgsConstructorProcessor(),
-        RequiredArgsConstructorProcessor()
+        RequiredArgsConstructorProcessor(),
+        BuilderProcessor(config)
     )
 
     /**
@@ -85,12 +88,12 @@ class LombokSyntheticJavaPartsProvider(config: LombokConfig) : SyntheticJavaPart
     }
 
     context(LazyJavaResolverContext)
-    private fun getSyntheticParts(descriptor: ClassDescriptor): SyntheticParts =
+    private fun getSyntheticParts(descriptor: ClassDescriptor): SyntheticParts {
-        descriptor.getJavaClass()?.let {
+        if (descriptor !is LazyJavaClassDescriptor && descriptor !is SyntheticJavaClassDescriptor) return SyntheticParts.Empty
-            partsCache.getOrPut(descriptor) {
+        return partsCache.getOrPut(descriptor) {
-                computeSyntheticParts(descriptor)
+            computeSyntheticParts(descriptor)
-            }
+        }
-        } ?: SyntheticParts.Empty
+    }
 
     context(LazyJavaResolverContext)
     private fun computeSyntheticParts(descriptor: ClassDescriptor): SyntheticParts {

plugins/lombok/lombok.k1/src/org/jetbrains/kotlin/lombok/config/annotationConfig.kt

@@ -189,6 +189,36 @@ object LombokAnnotations {
                 )
         }
     }
+
+    class Builder(
+        val builderClassName: String,
+        val buildMethodName: String,
+        val builderMethodName: String,
+        val requiresToBuilder: Boolean,
+        val visibility: AccessLevel,
+        val setterPrefix: String?
+    ) {
+        companion object : AnnotationAndConfigCompanion<Builder>(LombokNames.BUILDER) {
+            private const val DEFAULT_BUILDER_CLASS_NAME = "*Builder"
+            private const val DEFAULT_BUILD_METHOD_NAME = "build"
+            private const val DEFAULT_BUILDER_METHOD_NAME = "builder"
+            private const val DEFAULT_REQUIRES_TO_BUILDER = false
+
+
+            override fun extract(annotation: AnnotationDescriptor?, config: LombokConfig): Builder {
+                return Builder(
+                    builderClassName = annotation?.getStringArgument("builderClassName")
+                        ?: config.getString("lombok.builder.className")
+                        ?: DEFAULT_BUILDER_CLASS_NAME,
+                    buildMethodName = annotation?.getStringArgument("buildMethodName") ?: DEFAULT_BUILD_METHOD_NAME,
+                    builderMethodName = annotation?.getStringArgument("builderMethodName") ?: DEFAULT_BUILDER_METHOD_NAME,
+                    requiresToBuilder = annotation?.getBooleanArgument("toBuilder") ?: DEFAULT_REQUIRES_TO_BUILDER,
+                    visibility = annotation?.getAccessLevel("access") ?: AccessLevel.PUBLIC,
+                    setterPrefix = annotation?.getStringArgument("setterPrefix")
+                )
+            }
+        }
+    }
 }
 
 

plugins/lombok/lombok.k1/src/org/jetbrains/kotlin/lombok/processor/BuilderProcessor.kt

@@ -0,0 +1,124 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.lombok.processor
+
+import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.annotations.Annotations
+import org.jetbrains.kotlin.load.java.JavaDescriptorVisibilities
+import org.jetbrains.kotlin.load.java.lazy.LazyJavaResolverContext
+import org.jetbrains.kotlin.load.java.lazy.descriptors.SyntheticJavaClassDescriptor
+import org.jetbrains.kotlin.lombok.config.LombokAnnotations.Builder
+import org.jetbrains.kotlin.lombok.config.LombokConfig
+import org.jetbrains.kotlin.lombok.config.toDescriptorVisibility
+import org.jetbrains.kotlin.lombok.utils.*
+import org.jetbrains.kotlin.name.Name
+
+class BuilderProcessor(private val config: LombokConfig) : Processor {
+    companion object {
+        private const val BUILDER_DATA = "Lombok.BuilderData"
+        private const val TO_BUILDER = "toBuilder"
+    }
+
+    context(LazyJavaResolverContext)
+    @Suppress("IncorrectFormatting") // KTIJ-22227
+    override fun contribute(classDescriptor: ClassDescriptor, partsBuilder: SyntheticPartsBuilder) {
+        if (classDescriptor is SyntheticJavaClassDescriptor) {
+            val builderData = classDescriptor.attributes[BUILDER_DATA] as? BuilderData ?: return
+            contributeToBuilderClass(classDescriptor, builderData.constructingClass, builderData.builder, partsBuilder)
+        } else {
+            val builder = Builder.getIfAnnotated(classDescriptor, config) ?: return
+            contributeToAnnotatedClass(classDescriptor, builder, partsBuilder)
+        }
+    }
+
+    context(LazyJavaResolverContext)
+    @Suppress("IncorrectFormatting") // KTIJ-22227
+    private fun contributeToAnnotatedClass(classDescriptor: ClassDescriptor, builder: Builder, partsBuilder: SyntheticPartsBuilder) {
+        val builderName = Name.identifier(builder.builderClassName.replace("*", classDescriptor.name.asString()))
+        val visibility = builder.visibility.toDescriptorVisibility()
+        val builderDescriptor = SyntheticJavaClassDescriptor(
+            outerContext = this@LazyJavaResolverContext,
+            name = builderName,
+            outerClass = classDescriptor,
+            classKind = ClassKind.CLASS,
+            modality = Modality.FINAL,
+            visibility = visibility,
+            isInner = false,
+            isRecord = false,
+            annotations = Annotations.EMPTY,
+            declaredTypeParameters = emptyList(),
+            sealedSubclasses = emptyList(),
+            supertypes = listOf(components.module.builtIns.anyType),
+            attributes = mapOf(BUILDER_DATA to BuilderData(builder, classDescriptor))
+        )
+        partsBuilder.addClass(builderDescriptor)
+        val builderFunction = classDescriptor.createFunction(
+            Name.identifier(builder.builderMethodName),
+            valueParameters = emptyList(),
+            returnType = builderDescriptor.defaultType,
+            modality = Modality.FINAL,
+            visibility = visibility,
+            receiver = null
+        )
+        partsBuilder.addStaticFunction(builderFunction)
+
+        if (builder.requiresToBuilder) {
+            val toBuilderFunction = classDescriptor.createFunction(
+                Name.identifier(TO_BUILDER),
+                valueParameters = emptyList(),
+                returnType = builderDescriptor.defaultType,
+                modality = Modality.FINAL,
+                visibility = visibility
+            )
+            partsBuilder.addMethod(toBuilderFunction)
+        }
+    }
+
+    private fun contributeToBuilderClass(
+        builderClass: ClassDescriptor,
+        constructingClass: ClassDescriptor,
+        builder: Builder,
+        partsBuilder: SyntheticPartsBuilder
+    ) {
+        val constructor = builderClass.createJavaConstructor(valueParameters = emptyList(), JavaDescriptorVisibilities.PACKAGE_VISIBILITY)
+        partsBuilder.addConstructor(constructor)
+
+        val visibility = builder.visibility.toDescriptorVisibility()
+
+        val buildFunction = builderClass.createFunction(
+            Name.identifier(builder.buildMethodName),
+            valueParameters = emptyList(),
+            returnType = constructingClass.defaultType,
+            visibility = visibility
+        )
+        partsBuilder.addMethod(buildFunction)
+
+        for (field in constructingClass.getJavaFields()) {
+            createSetterMethod(builder, field, builderClass, partsBuilder)
+        }
+    }
+
+    private fun createSetterMethod(
+        builder: Builder,
+        field: PropertyDescriptor,
+        builderClass: ClassDescriptor,
+        partsBuilder: SyntheticPartsBuilder
+    ) {
+        val prefix = builder.setterPrefix
+        val fieldName = field.name
+        val setterName = if (prefix.isNullOrBlank()) fieldName else Name.identifier("${prefix}${field.name.asString().capitalize()}")
+        val setFunction = builderClass.createFunction(
+            name = setterName,
+            valueParameters = listOf(LombokValueParameter(fieldName, field.type)),
+            returnType = builderClass.defaultType,
+            modality = Modality.FINAL,
+            visibility = builder.visibility.toDescriptorVisibility()
+        )
+        partsBuilder.addMethod(setFunction)
+    }
+
+    private class BuilderData(val builder: Builder, val constructingClass: ClassDescriptor)
+}

plugins/lombok/lombok.k1/src/org/jetbrains/kotlin/lombok/utils/annotationUtils.kt

@@ -20,6 +20,11 @@ fun getAccessLevel(annotation: AnnotationDescriptor, field: String = "value"): A
     return AccessLevel.valueOf(value)
 }
 
+@JvmName("getAccessLevelWithReceiver")
+fun AnnotationDescriptor.getAccessLevel(field: String = "value"): AccessLevel {
+    return getAccessLevel(this, field)
+}
+
 fun AnnotationDescriptor.getStringArgument(argumentName: String): String? {
     val argument = allValueArguments[Name.identifier(argumentName)]
         ?: return null

plugins/lombok/testData/box/builder.kt

@@ -0,0 +1,29 @@
+// FILE: User.java
+
+import lombok.Builder;
+import lombok.Data;
+
+@Builder
+@Data
+public class User {
+  @Builder.Default private int created = 0;
+  private String name;
+  private int age;
+}
+
+
+// FILE: test.kt
+
+fun box(): String {
+    val userBuilder = User.builder()
+        .created(10)
+        .name("John")
+        .age(42)
+
+    val user = userBuilder.build()
+    return if (user.created == 10 && user.name == "John" && user.age == 42) {
+        "OK"
+    } else {
+        "Error: $user"
+    }
+}

plugins/lombok/testData/diagnostics/builderAnnotationArguments.kt

@@ -0,0 +1,36 @@
+// FIR_IDENTICAL
+// FILE: User.java
+
+import lombok.Builder;
+import lombok.Data;
+
+@Builder(
+    builderClassName = "SpecialUserBuilder",
+    buildMethodName = "execute",
+    builderMethodName = "createBuilder",
+    toBuilder = true,
+    access = AccessLevel.PACKAGE,
+    setterPrefix = "set"
+)
+@Data
+public class User {
+  @Builder.Default private int created = 0;
+  private String name;
+  private int age;
+}
+
+
+// FILE: test.kt
+
+fun test() {
+    val userBuilder: User.SpecialUserBuilder = User.createBuilder()
+    val user = userBuilder
+        .setCreated(10)
+        .setName("John")
+        .setAge(42)
+        .execute()
+}
+
+fun testToBuilder(user: User) {
+    val userBuilder: User.SpecialUserBuilder = user.toBuilder()
+}

plugins/lombok/testData/diagnostics/builderAnnotationArguments.txt

@@ -0,0 +1,25 @@
+package
+
+public fun </*0*/ T> assertEquals(/*0*/ a: T, /*1*/ b: T): kotlin.Unit
+public fun test(): kotlin.Unit
+public fun testToBuilder(/*0*/ user: User): kotlin.Unit
+
+@lombok.Builder(access = AccessLevel.PACKAGE, buildMethodName = "execute", builderClassName = "SpecialUserBuilder", builderMethodName = "createBuilder", setterPrefix = "set", toBuilder = true) @lombok.Data public open class User {
+    public constructor User()
+    private final var age: kotlin.Int
+    @lombok.Builder.Default private final var created: kotlin.Int
+    private final var name: kotlin.String!
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open /*synthesized*/ fun getAge(): kotlin.Int
+    public open /*synthesized*/ fun getCreated(): kotlin.Int
+    public open /*synthesized*/ fun getName(): kotlin.String!
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open /*synthesized*/ fun setAge(/*0*/ age: kotlin.Int): kotlin.Unit
+    public open /*synthesized*/ fun setCreated(/*0*/ created: kotlin.Int): kotlin.Unit
+    public open /*synthesized*/ fun setName(/*0*/ name: kotlin.String!): kotlin.Unit
+    public/*package*/ final /*synthesized*/ fun toBuilder(): User.SpecialUserBuilder
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public/*package*/ final /*synthesized*/ fun createBuilder(): User.SpecialUserBuilder
+}

plugins/lombok/testData/diagnostics/builderConfig.kt

@@ -0,0 +1,19 @@
+// FILE: User.java
+
+import lombok.Builder;
+import lombok.Data;
+
+@Builder
+@Data
+public class User {
+  private String name;
+}
+
+
+// FILE: test.kt
+fun test() {
+    val userBuilder: User.SpecialUserBuilder = User.builder()
+}
+
+// FILE: lombok.config
+lombok.builder.className=Special*Builder

plugins/lombok/testData/diagnostics/builderConfig.txt

@@ -0,0 +1,17 @@
+package
+
+public fun </*0*/ T> assertEquals(/*0*/ a: T, /*1*/ b: T): kotlin.Unit
+public fun test(): kotlin.Unit
+
+@lombok.Builder @lombok.Data public open class User {
+    public constructor User()
+    private final var name: kotlin.String!
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open /*synthesized*/ fun getName(): kotlin.String!
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open /*synthesized*/ fun setName(/*0*/ name: kotlin.String!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public final /*synthesized*/ fun builder(): User.SpecialUserBuilder
+}

plugins/lombok/tests-gen/org/jetbrains/kotlin/lombok/BlackBoxCodegenTestForLombokGenerated.java

@@ -49,6 +49,12 @@ public class BlackBoxCodegenTestForLombokGenerated extends AbstractBlackBoxCodeg
         KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("plugins/lombok/testData/box"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM, true);
     }
 
+    @Test
+    @TestMetadata("builder.kt")
+    public void testBuilder() throws Exception {
+        runTest("plugins/lombok/testData/box/builder.kt");
+    }
+
     @Test
     @TestMetadata("configAccessors.kt")
     public void testConfigAccessors() throws Exception {

plugins/lombok/tests-gen/org/jetbrains/kotlin/lombok/DiagnosticTestForLombokGenerated.java

@@ -36,6 +36,18 @@ public class DiagnosticTestForLombokGenerated extends AbstractDiagnosticTestForL
         runTest("plugins/lombok/testData/diagnostics/annotationTypes.kt");
     }
 
+    @Test
+    @TestMetadata("builderAnnotationArguments.kt")
+    public void testBuilderAnnotationArguments() throws Exception {
+        runTest("plugins/lombok/testData/diagnostics/builderAnnotationArguments.kt");
+    }
+
+    @Test
+    @TestMetadata("builderConfig.kt")
+    public void testBuilderConfig() throws Exception {
+        runTest("plugins/lombok/testData/diagnostics/builderConfig.kt");
+    }
+
     @Test
     @TestMetadata("clashAccessors.kt")
     public void testClashAccessors() throws Exception {

plugins/lombok/tests-gen/org/jetbrains/kotlin/lombok/FirBlackBoxCodegenTestForLombokGenerated.java

@@ -49,6 +49,12 @@ public class FirBlackBoxCodegenTestForLombokGenerated extends AbstractFirBlackBo
         KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("plugins/lombok/testData/box"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
     }
 
+    @Test
+    @TestMetadata("builder.kt")
+    public void testBuilder() throws Exception {
+        runTest("plugins/lombok/testData/box/builder.kt");
+    }
+
     @Test
     @TestMetadata("configAccessors.kt")
     public void testConfigAccessors() throws Exception {

plugins/lombok/tests-gen/org/jetbrains/kotlin/lombok/FirDiagnosticTestForLombokGenerated.java

@@ -36,6 +36,18 @@ public class FirDiagnosticTestForLombokGenerated extends AbstractFirDiagnosticTe
         runTest("plugins/lombok/testData/diagnostics/annotationTypes.kt");
     }
 
+    @Test
+    @TestMetadata("builderAnnotationArguments.kt")
+    public void testBuilderAnnotationArguments() throws Exception {
+        runTest("plugins/lombok/testData/diagnostics/builderAnnotationArguments.kt");
+    }
+
+    @Test
+    @TestMetadata("builderConfig.kt")
+    public void testBuilderConfig() throws Exception {
+        runTest("plugins/lombok/testData/diagnostics/builderConfig.kt");
+    }
+
     @Test
     @TestMetadata("clashAccessors.kt")
     public void testClashAccessors() throws Exception {

plugins/lombok/tests-gen/org/jetbrains/kotlin/lombok/IrBlackBoxCodegenTestForLombokGenerated.java

@@ -49,6 +49,12 @@ public class IrBlackBoxCodegenTestForLombokGenerated extends AbstractIrBlackBoxC
         KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("plugins/lombok/testData/box"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
     }
 
+    @Test
+    @TestMetadata("builder.kt")
+    public void testBuilder() throws Exception {
+        runTest("plugins/lombok/testData/box/builder.kt");
+    }
+
     @Test
     @TestMetadata("configAccessors.kt")
     public void testConfigAccessors() throws Exception {