/* * Copyright (C) 2013-2018 The Project Lombok Authors. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package lombok.javac.handlers; import static lombok.core.handlers.HandlerUtil.*; import static lombok.javac.Javac.*; import static lombok.javac.handlers.JavacHandlerUtil.*; import java.util.ArrayList; import javax.lang.model.element.Modifier; import org.mangosdk.spi.ProviderFor; import com.sun.tools.javac.code.BoundKind; import com.sun.tools.javac.code.Flags; import com.sun.tools.javac.tree.JCTree; import com.sun.tools.javac.tree.JCTree.JCAnnotation; import com.sun.tools.javac.tree.JCTree.JCAssign; import com.sun.tools.javac.tree.JCTree.JCBlock; import com.sun.tools.javac.tree.JCTree.JCClassDecl; import com.sun.tools.javac.tree.JCTree.JCExpression; import com.sun.tools.javac.tree.JCTree.JCExpressionStatement; import com.sun.tools.javac.tree.JCTree.JCFieldAccess; import com.sun.tools.javac.tree.JCTree.JCIdent; import com.sun.tools.javac.tree.JCTree.JCMethodDecl; import com.sun.tools.javac.tree.JCTree.JCMethodInvocation; import com.sun.tools.javac.tree.JCTree.JCModifiers; import com.sun.tools.javac.tree.JCTree.JCReturn; import com.sun.tools.javac.tree.JCTree.JCStatement; import com.sun.tools.javac.tree.JCTree.JCTypeApply; import com.sun.tools.javac.tree.JCTree.JCTypeParameter; import com.sun.tools.javac.tree.JCTree.JCVariableDecl; import com.sun.tools.javac.tree.JCTree.JCWildcard; import com.sun.tools.javac.util.List; import com.sun.tools.javac.util.ListBuffer; import com.sun.tools.javac.util.Name; import lombok.AccessLevel; import lombok.Builder; import lombok.Builder.ObtainVia; import lombok.ConfigurationKeys; import lombok.Singular; import lombok.ToString; import lombok.core.AST.Kind; import lombok.core.AnnotationValues; import lombok.core.HandlerPriority; import lombok.core.handlers.HandlerUtil; import lombok.core.handlers.HandlerUtil.FieldAccess; import lombok.core.handlers.InclusionExclusionUtils.Included; import lombok.experimental.NonFinal; import lombok.experimental.SuperBuilder; import lombok.javac.Javac; import lombok.javac.JavacAnnotationHandler; import lombok.javac.JavacNode; import lombok.javac.JavacTreeMaker; import lombok.javac.handlers.HandleBuilder.BuilderFieldData; import lombok.javac.handlers.JavacHandlerUtil.MemberExistsResult; import lombok.javac.handlers.JavacSingularsRecipes.ExpressionMaker; import lombok.javac.handlers.JavacSingularsRecipes.JavacSingularizer; import lombok.javac.handlers.JavacSingularsRecipes.SingularData; import lombok.javac.handlers.JavacSingularsRecipes.StatementMaker; @ProviderFor(JavacAnnotationHandler.class) @HandlerPriority(-1024) //-2^10; to ensure we've picked up @FieldDefault's changes (-2048) but @Value hasn't removed itself yet (-512), so that we can error on presence of it on the builder classes. public class HandleSuperBuilder extends JavacAnnotationHandler { private static final String SELF_METHOD = "self"; private static final String TO_BUILDER_METHOD_NAME = "toBuilder"; private static final String FILL_VALUES_METHOD_NAME = "$fillValuesFrom"; private static final String STATIC_FILL_VALUES_METHOD_NAME = "$fillValuesFromInstanceIntoBuilder"; private static final String INSTANCE_VARIABLE_NAME = "instance"; private static final String BUILDER_VARIABLE_NAME = "b"; @Override public void handle(AnnotationValues annotation, JCAnnotation ast, JavacNode annotationNode) { handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.SUPERBUILDER_FLAG_USAGE, "@SuperBuilder"); SuperBuilder superbuilderAnnotation = annotation.getInstance(); deleteAnnotationIfNeccessary(annotationNode, SuperBuilder.class); String builderMethodName = superbuilderAnnotation.builderMethodName(); String buildMethodName = superbuilderAnnotation.buildMethodName(); if (builderMethodName == null) builderMethodName = "builder"; if (buildMethodName == null) buildMethodName = "build"; if (!checkName("builderMethodName", builderMethodName, annotationNode)) return; if (!checkName("buildMethodName", buildMethodName, annotationNode)) return; boolean toBuilder = superbuilderAnnotation.toBuilder(); JavacNode tdParent = annotationNode.up(); java.util.List builderFields = new ArrayList(); List typeParams = List.nil(); List thrownExceptions = List.nil(); List superclassTypeParams = List.nil(); boolean addCleaning = false; if (!(tdParent.get() instanceof JCClassDecl)) { annotationNode.addError("@SuperBuilder is only supported on types."); return; } // Gather all fields of the class that should be set by the builder. JCClassDecl td = (JCClassDecl) tdParent.get(); ListBuffer allFields = new ListBuffer(); boolean valuePresent = (hasAnnotation(lombok.Value.class, tdParent) || hasAnnotation("lombok.experimental.Value", tdParent)); for (JavacNode fieldNode : HandleConstructor.findAllFields(tdParent, true)) { JCVariableDecl fd = (JCVariableDecl) fieldNode.get(); JavacNode isDefault = findAnnotation(Builder.Default.class, fieldNode, true); boolean isFinal = (fd.mods.flags & Flags.FINAL) != 0 || (valuePresent && !hasAnnotation(NonFinal.class, fieldNode)); BuilderFieldData bfd = new BuilderFieldData(); bfd.rawName = fd.name; bfd.name = removePrefixFromField(fieldNode); bfd.annotations = findCopyableAnnotations(fieldNode); bfd.type = fd.vartype; bfd.singularData = getSingularData(fieldNode); bfd.originalFieldNode = fieldNode; if (bfd.singularData != null && isDefault != null) { isDefault.addError("@Builder.Default and @Singular cannot be mixed."); isDefault = null; } if (fd.init == null && isDefault != null) { isDefault.addWarning("@Builder.Default requires an initializing expression (' = something;')."); isDefault = null; } if (fd.init != null && isDefault == null) { if (isFinal) continue; fieldNode.addWarning("@SuperBuilder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final."); } if (isDefault != null) { bfd.nameOfDefaultProvider = tdParent.toName("$default$" + bfd.name); bfd.nameOfSetFlag = tdParent.toName(bfd.name + "$set"); bfd.nameOfSetFlag = tdParent.toName(bfd.name + "$set"); JCMethodDecl md = HandleBuilder.generateDefaultProvider(bfd.nameOfDefaultProvider, fieldNode, td.typarams); recursiveSetGeneratedBy(md, ast, annotationNode.getContext()); if (md != null) injectMethod(tdParent, md); } addObtainVia(bfd, fieldNode); builderFields.add(bfd); allFields.append(fieldNode); } // Set the names of the builder classes. String builderClassName = td.name.toString() + "Builder"; String builderImplClassName = builderClassName + "Impl"; JCTree extendsClause = Javac.getExtendsClause(td); JCExpression superclassBuilderClassExpression = null; if (extendsClause instanceof JCTypeApply) { // Remember the type arguments, because we need them for the extends clause of our abstract builder class. superclassTypeParams = ((JCTypeApply) extendsClause).getTypeArguments(); // A class name with a generics type, e.g., "Superclass". extendsClause = ((JCTypeApply) extendsClause).getType(); } if (extendsClause instanceof JCFieldAccess) { Name superclassClassName = ((JCFieldAccess)extendsClause).getIdentifier(); String superclassBuilderClassName = superclassClassName + "Builder"; superclassBuilderClassExpression = tdParent.getTreeMaker().Select((JCFieldAccess) extendsClause, tdParent.toName(superclassBuilderClassName)); } else if (extendsClause != null) { String superclassBuilderClassName = extendsClause.toString() + "Builder"; superclassBuilderClassExpression = chainDots(tdParent, extendsClause.toString(), superclassBuilderClassName); } // If there is no superclass, superclassBuilderClassExpression is still == null at this point. // You can use it to check whether to inherit or not. typeParams = td.typarams; // are the generics for our builder. String classGenericName = "C"; String builderGenericName = "B"; // If these generics' names collide with any generics on the annotated class, modify them. // For instance, if there are generics on the annotated class, use "C2" and "B3" for our builder. java.util.List typeParamStrings = new ArrayList(); for (JCTypeParameter typeParam : typeParams) typeParamStrings.add(typeParam.getName().toString()); classGenericName = generateNonclashingNameFor(classGenericName, typeParamStrings); builderGenericName = generateNonclashingNameFor(builderGenericName, typeParamStrings); thrownExceptions = List.nil(); // Check validity of @ObtainVia fields, and add check if adding cleaning for @Singular is necessary. for (BuilderFieldData bfd : builderFields) { if (bfd.singularData != null && bfd.singularData.getSingularizer() != null) { if (bfd.singularData.getSingularizer().requiresCleaning()) { addCleaning = true; break; } } if (bfd.obtainVia != null) { if (bfd.obtainVia.field().isEmpty() == bfd.obtainVia.method().isEmpty()) { bfd.obtainViaNode.addError("The syntax is either @ObtainVia(field = \"fieldName\") or @ObtainVia(method = \"methodName\")."); return; } if (bfd.obtainVia.method().isEmpty() && bfd.obtainVia.isStatic()) { bfd.obtainViaNode.addError("@ObtainVia(isStatic = true) is not valid unless 'method' has been set."); return; } } } // Create the abstract builder class. JavacNode builderType = findInnerClass(tdParent, builderClassName); if (builderType == null) { builderType = generateBuilderAbstractClass(annotationNode, tdParent, builderClassName, superclassBuilderClassExpression, typeParams, superclassTypeParams, classGenericName, builderGenericName); recursiveSetGeneratedBy(builderType.get(), ast, annotationNode.getContext()); } else { JCClassDecl builderTypeDeclaration = (JCClassDecl) builderType.get(); if (!builderTypeDeclaration.getModifiers().getFlags().contains(Modifier.STATIC) || !builderTypeDeclaration.getModifiers().getFlags().contains(Modifier.ABSTRACT)) { annotationNode.addError("Existing Builder must be an abstract static inner class."); return; } sanityCheckForMethodGeneratingAnnotationsOnBuilderClass(builderType, annotationNode); // Generate errors for @Singular BFDs that have one already defined node. for (BuilderFieldData bfd : builderFields) { SingularData sd = bfd.singularData; if (sd == null) continue; JavacSingularizer singularizer = sd.getSingularizer(); if (singularizer == null) continue; if (singularizer.checkForAlreadyExistingNodesAndGenerateError(builderType, sd)) { bfd.singularData = null; } } } // Generate the fields in the abstract builder class that hold the values for the instance. generateBuilderFields(builderType, builderFields, ast); if (addCleaning) { JavacTreeMaker maker = builderType.getTreeMaker(); JCVariableDecl uncleanField = maker.VarDef(maker.Modifiers(Flags.PRIVATE), builderType.toName("$lombokUnclean"), maker.TypeIdent(CTC_BOOLEAN), null); recursiveSetGeneratedBy(uncleanField, ast, annotationNode.getContext()); injectFieldAndMarkGenerated(builderType, uncleanField); } if (toBuilder) { // Generate $fillValuesFrom() method in the abstract builder. JCMethodDecl fvm = generateFillValuesMethod(tdParent, superclassBuilderClassExpression != null, builderGenericName, classGenericName, builderClassName); recursiveSetGeneratedBy(fvm, ast, annotationNode.getContext()); injectMethod(builderType, fvm); // Generate $fillValuesFromInstanceIntoBuilder() method in the builder implementation class. JCMethodDecl sfvm = generateStaticFillValuesMethod(tdParent, builderClassName, typeParams, builderFields); recursiveSetGeneratedBy(sfvm, ast, annotationNode.getContext()); injectMethod(builderType, sfvm); } // Generate abstract self() and build() methods in the abstract builder. JCMethodDecl asm = generateAbstractSelfMethod(tdParent, superclassBuilderClassExpression != null, builderGenericName); recursiveSetGeneratedBy(asm, ast, annotationNode.getContext()); injectMethod(builderType, asm); JCMethodDecl abm = generateAbstractBuildMethod(tdParent, buildMethodName, superclassBuilderClassExpression != null, classGenericName); recursiveSetGeneratedBy(abm, ast, annotationNode.getContext()); injectMethod(builderType, abm); // Create the setter methods in the abstract builder. for (BuilderFieldData bfd : builderFields) { generateSetterMethodsForBuilder(builderType, bfd, annotationNode, builderGenericName); } // Create the toString() method for the abstract builder. java.util.List> fieldNodes = new ArrayList>(); for (BuilderFieldData bfd : builderFields) { for (JavacNode f : bfd.createdFields) { fieldNodes.add(new Included(f, null, true)); } } // Let toString() call super.toString() if there is a superclass, so that it also shows fields from the superclass' builder. JCMethodDecl toStringMethod = HandleToString.createToString(builderType, fieldNodes, true, superclassBuilderClassExpression != null, FieldAccess.ALWAYS_FIELD, ast); if (toStringMethod != null) injectMethod(builderType, toStringMethod); // If clean methods are requested, add them now. if (addCleaning) { JCMethodDecl md = generateCleanMethod(builderFields, builderType, ast); recursiveSetGeneratedBy(md, ast, annotationNode.getContext()); injectMethod(builderType, md); } boolean isAbstract = (td.mods.flags & Flags.ABSTRACT) != 0; if (!isAbstract) { // Only non-abstract classes get the Builder implementation. // Create the builder implementation class. JavacNode builderImplType = findInnerClass(tdParent, builderImplClassName); if (builderImplType == null) { builderImplType = generateBuilderImplClass(annotationNode, tdParent, builderImplClassName, builderClassName, typeParams); recursiveSetGeneratedBy(builderImplType.get(), ast, annotationNode.getContext()); } else { JCClassDecl builderImplTypeDeclaration = (JCClassDecl) builderImplType.get(); if (!builderImplTypeDeclaration.getModifiers().getFlags().contains(Modifier.STATIC) || builderImplTypeDeclaration.getModifiers().getFlags().contains(Modifier.ABSTRACT)) { annotationNode.addError("Existing BuilderImpl must be a non-abstract static inner class."); return; } sanityCheckForMethodGeneratingAnnotationsOnBuilderClass(builderImplType, annotationNode); } // Create a simple constructor for the BuilderImpl class. JCMethodDecl cd = HandleConstructor.createConstructor(AccessLevel.PRIVATE, List.nil(), builderImplType, List.nil(), false, annotationNode); if (cd != null) injectMethod(builderImplType, cd); // Create the self() and build() methods in the BuilderImpl. JCMethodDecl selfMethod = generateSelfMethod(builderImplType, typeParams); recursiveSetGeneratedBy(selfMethod, ast, annotationNode.getContext()); injectMethod(builderImplType, selfMethod); if (methodExists(buildMethodName, builderImplType, -1) == MemberExistsResult.NOT_EXISTS) { JCMethodDecl buildMethod = generateBuildMethod(buildMethodName, tdParent, builderImplType, thrownExceptions); recursiveSetGeneratedBy(buildMethod, ast, annotationNode.getContext()); injectMethod(builderImplType, buildMethod); } } // Generate a constructor in the annotated class that takes a builder as argument. generateBuilderBasedConstructor(tdParent, typeParams, builderFields, annotationNode, builderClassName, superclassBuilderClassExpression != null); if (isAbstract) { // Only non-abstract classes get the builder() and toBuilder() methods. return; } // Add the builder() method to the annotated class. // Allow users to specify their own builder() methods, e.g., to provide default values. if (methodExists(builderMethodName, tdParent, -1) == MemberExistsResult.NOT_EXISTS) { JCMethodDecl builderMethod = generateBuilderMethod(builderMethodName, builderClassName, builderImplClassName, annotationNode, tdParent, typeParams); recursiveSetGeneratedBy(builderMethod, ast, annotationNode.getContext()); if (builderMethod != null) injectMethod(tdParent, builderMethod); } // Add the toBuilder() method to the annotated class. if (toBuilder) { switch (methodExists(TO_BUILDER_METHOD_NAME, tdParent, 0)) { case EXISTS_BY_USER: annotationNode.addWarning("Not generating toBuilder() as it already exists."); return; case NOT_EXISTS: JCMethodDecl md = generateToBuilderMethod(builderClassName, builderImplClassName, annotationNode, tdParent, typeParams); if (md != null) { recursiveSetGeneratedBy(md, ast, annotationNode.getContext()); injectMethod(tdParent, md); } default: // Should not happen. } } } /** * Creates and returns the abstract builder class and injects it into the annotated class. */ private JavacNode generateBuilderAbstractClass(JavacNode source, JavacNode tdParent, String builderClass, JCExpression superclassBuilderClassExpression, List typeParams, List superclassTypeParams, String classGenericName, String builderGenericName) { JavacTreeMaker maker = tdParent.getTreeMaker(); JCModifiers mods = maker.Modifiers(Flags.STATIC | Flags.ABSTRACT | Flags.PUBLIC); // Keep any type params of the annotated class. ListBuffer allTypeParams = new ListBuffer(); allTypeParams.addAll(copyTypeParams(source, typeParams)); // Add builder-specific type params required for inheritable builders. // 1. The return type for the build() method, named "C", which extends the annotated class. JCExpression annotatedClass = maker.Ident(tdParent.toName(tdParent.getName())); if (typeParams.nonEmpty()) { // Add type params of the annotated class. annotatedClass = maker.TypeApply(annotatedClass, getTypeParamExpressions(typeParams, maker).toList()); } allTypeParams.add(maker.TypeParameter(tdParent.toName(classGenericName), List.of(annotatedClass))); // 2. The return type for all setter methods, named "B", which extends this builder class. Name builderClassName = tdParent.toName(builderClass); ListBuffer typeParamsForBuilder = getTypeParamExpressions(typeParams, maker); typeParamsForBuilder.add(maker.Ident(tdParent.toName(classGenericName))); typeParamsForBuilder.add(maker.Ident(tdParent.toName(builderGenericName))); JCTypeApply typeApply = maker.TypeApply(maker.Ident(builderClassName), typeParamsForBuilder.toList()); allTypeParams.add(maker.TypeParameter(tdParent.toName(builderGenericName), List.of(typeApply))); JCExpression extending = null; if (superclassBuilderClassExpression != null) { // If the annotated class extends another class, we want this builder to extend the builder of the superclass. // 1. Add the type parameters of the superclass. typeParamsForBuilder = getTypeParamExpressions(superclassTypeParams, maker); // 2. Add the builder type params . typeParamsForBuilder.add(maker.Ident(tdParent.toName(classGenericName))); typeParamsForBuilder.add(maker.Ident(tdParent.toName(builderGenericName))); extending = maker.TypeApply(superclassBuilderClassExpression, typeParamsForBuilder.toList()); } JCClassDecl builder = maker.ClassDef(mods, builderClassName, allTypeParams.toList(), extending, List.nil(), List.nil()); return injectType(tdParent, builder); } /** * Creates and returns the concrete builder implementation class and injects it into the annotated class. */ private JavacNode generateBuilderImplClass(JavacNode source, JavacNode tdParent, String builderImplClass, String builderAbstractClass, List typeParams) { JavacTreeMaker maker = tdParent.getTreeMaker(); JCModifiers mods = maker.Modifiers(Flags.STATIC | Flags.PRIVATE | Flags.FINAL); // Extend the abstract builder. JCExpression extending = maker.Ident(tdParent.toName(builderAbstractClass)); // Add any type params of the annotated class. ListBuffer allTypeParams = new ListBuffer(); allTypeParams.addAll(copyTypeParams(source, typeParams)); // Add builder-specific type params required for inheritable builders. // 1. The return type for the build() method (named "C" in the abstract builder), which is the annotated class. JCExpression annotatedClass = maker.Ident(tdParent.toName(tdParent.getName())); if (typeParams.nonEmpty()) { // Add type params of the annotated class. annotatedClass = maker.TypeApply(annotatedClass, getTypeParamExpressions(typeParams, maker).toList()); } // 2. The return type for all setter methods (named "B" in the abstract builder), which is this builder class. JCExpression builderImplClassExpression = maker.Ident(tdParent.toName(builderImplClass)); if (typeParams.nonEmpty()) { builderImplClassExpression = maker.TypeApply(builderImplClassExpression, getTypeParamExpressions(typeParams, maker).toList()); } ListBuffer typeParamsForBuilder = getTypeParamExpressions(typeParams, maker); typeParamsForBuilder.add(annotatedClass); typeParamsForBuilder.add(builderImplClassExpression); extending = maker.TypeApply(extending, typeParamsForBuilder.toList()); JCClassDecl builder = maker.ClassDef(mods, tdParent.toName(builderImplClass), copyTypeParams(source, typeParams), extending, List.nil(), List.nil()); return injectType(tdParent, builder); } /** * Generates a constructor that has a builder as the only parameter. * The values from the builder are used to initialize the fields of new instances. * * @param typeNode * the type (with the {@code @Builder} annotation) for which a * constructor should be generated. * @param typeParams * @param builderFields a list of fields in the builder which should be assigned to new instances. * @param source the annotation (used for setting source code locations for the generated code). * @param callBuilderBasedSuperConstructor * If {@code true}, the constructor will explicitly call a super * constructor with the builder as argument. Requires * {@code builderClassAsParameter != null}. */ private void generateBuilderBasedConstructor(JavacNode typeNode, List typeParams, java.util.List builderFields, JavacNode source, String builderClassName, boolean callBuilderBasedSuperConstructor) { JavacTreeMaker maker = typeNode.getTreeMaker(); AccessLevel level = AccessLevel.PROTECTED; ListBuffer statements = new ListBuffer(); Name builderVariableName = typeNode.toName(BUILDER_VARIABLE_NAME); for (BuilderFieldData bfd : builderFields) { JCExpression rhs; if (bfd.singularData != null && bfd.singularData.getSingularizer() != null) { bfd.singularData.getSingularizer().appendBuildCode(bfd.singularData, bfd.originalFieldNode, bfd.type, statements, bfd.name, "b"); rhs = maker.Ident(bfd.singularData.getPluralName()); } else { rhs = maker.Select(maker.Ident(builderVariableName), bfd.name); } JCFieldAccess fieldInThis = maker.Select(maker.Ident(typeNode.toName("this")), bfd.rawName); JCStatement assign = maker.Exec(maker.Assign(fieldInThis, rhs)); // In case of @Builder.Default, set the value to the default if it was not set in the builder. if (bfd.nameOfSetFlag != null) { JCFieldAccess setField = maker.Select(maker.Ident(builderVariableName), bfd.nameOfSetFlag); fieldInThis = maker.Select(maker.Ident(typeNode.toName("this")), bfd.rawName); JCAssign assignDefault = maker.Assign(fieldInThis, maker.Apply(typeParameterNames(maker, ((JCClassDecl) typeNode.get()).typarams), maker.Select(maker.Ident(((JCClassDecl) typeNode.get()).name), bfd.nameOfDefaultProvider), List.nil())); statements.append(maker.If(setField, assign, maker.Exec(assignDefault))); } else { statements.append(assign); } if (hasNonNullAnnotations(bfd.originalFieldNode)) { JCStatement nullCheck = generateNullCheck(maker, bfd.originalFieldNode, source); if (nullCheck != null) statements.append(nullCheck); } } JCModifiers mods = maker.Modifiers(toJavacModifier(level), List.nil()); // Create a constructor that has just the builder as parameter. ListBuffer params = new ListBuffer(); long flags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, typeNode.getContext()); Name builderClassname = typeNode.toName(builderClassName); // First add all generics that are present on the parent type. ListBuffer typeParamsForBuilderParameter = getTypeParamExpressions(typeParams, maker); // Now add the . JCWildcard wildcard = maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null); typeParamsForBuilderParameter.add(wildcard); wildcard = maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null); typeParamsForBuilderParameter.add(wildcard); JCTypeApply paramType = maker.TypeApply(maker.Ident(builderClassname), typeParamsForBuilderParameter.toList()); JCVariableDecl param = maker.VarDef(maker.Modifiers(flags), builderVariableName, paramType, null); params.append(param); if (callBuilderBasedSuperConstructor) { // The first statement must be the call to the super constructor. JCMethodInvocation callToSuperConstructor = maker.Apply(List.nil(), maker.Ident(typeNode.toName("super")), List.of(maker.Ident(builderVariableName))); statements.prepend(maker.Exec(callToSuperConstructor)); } JCMethodDecl constr = recursiveSetGeneratedBy(maker.MethodDef(mods, typeNode.toName(""), null, List.nil(), params.toList(), List.nil(), maker.Block(0L, statements.toList()), null), source.get(), typeNode.getContext()); injectMethod(typeNode, constr, null, Javac.createVoidType(typeNode.getSymbolTable(), CTC_VOID)); } private JCMethodDecl generateBuilderMethod(String builderMethodName, String builderClassName, String builderImplClassName, JavacNode source, JavacNode type, List typeParams) { JavacTreeMaker maker = type.getTreeMaker(); ListBuffer typeArgs = new ListBuffer(); for (JCTypeParameter typeParam : typeParams) typeArgs.append(maker.Ident(typeParam.name)); JCExpression call = maker.NewClass(null, List.nil(), namePlusTypeParamsToTypeReference(maker, type.toName(builderImplClassName), typeParams), List.nil(), null); JCStatement statement = maker.Return(call); JCBlock body = maker.Block(0, List.of(statement)); int modifiers = Flags.PUBLIC; modifiers |= Flags.STATIC; // Add any type params of the annotated class to the return type. ListBuffer typeParameterNames = new ListBuffer(); typeParameterNames.addAll(typeParameterNames(maker, typeParams)); // Now add the . JCWildcard wildcard = maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null); typeParameterNames.add(wildcard); typeParameterNames.add(wildcard); JCTypeApply returnType = maker.TypeApply(maker.Ident(type.toName(builderClassName)), typeParameterNames.toList()); return maker.MethodDef(maker.Modifiers(modifiers), type.toName(builderMethodName), returnType, copyTypeParams(source, typeParams), List.nil(), List.nil(), body, null); } /** * Generates a toBuilder() method in the annotated class that looks like this: * 
	 * public ParentBuilder<?, ?> toBuilder() {
	 *     return new FoobarBuilderImpl().$fillValuesFrom(this);
	 * }
	 *
*/ private JCMethodDecl generateToBuilderMethod(String builderClassName, String builderImplClassName, JavacNode source, JavacNode type, List typeParams) { JavacTreeMaker maker = type.getTreeMaker(); ListBuffer typeArgs = new ListBuffer(); for (JCTypeParameter typeParam : typeParams) typeArgs.append(maker.Ident(typeParam.name)); JCExpression newClass = maker.NewClass(null, List.nil(), namePlusTypeParamsToTypeReference(maker, type.toName(builderImplClassName), typeParams), List.nil(), null); List methodArgs = List.of(maker.Ident(type.toName("this"))); JCMethodInvocation invokeFillMethod = maker.Apply(List.nil(), maker.Select(newClass, type.toName(FILL_VALUES_METHOD_NAME)), methodArgs); JCStatement statement = maker.Return(invokeFillMethod); JCBlock body = maker.Block(0, List.of(statement)); int modifiers = Flags.PUBLIC; // Add any type params of the annotated class to the return type. ListBuffer typeParameterNames = new ListBuffer(); typeParameterNames.addAll(typeParameterNames(maker, typeParams)); // Now add the . JCWildcard wildcard = maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null); typeParameterNames.add(wildcard); typeParameterNames.add(wildcard); JCTypeApply returnType = maker.TypeApply(maker.Ident(type.toName(builderClassName)), typeParameterNames.toList()); return maker.MethodDef(maker.Modifiers(modifiers), type.toName(TO_BUILDER_METHOD_NAME), returnType, List.nil(), List.nil(), List.nil(), body, null); } /** * Generates a $fillValuesFrom() method in the abstract builder class that looks * like this: * 
	 * protected B $fillValuesFrom(final C instance) {
	 *     super.$fillValuesFrom(instance);
	 *     FoobarBuilderImpl.$fillValuesFromInstanceIntoBuilder(instance, this);
	 *     return self();
	 * }
	 *
*/ private JCMethodDecl generateFillValuesMethod(JavacNode type, boolean inherited, String builderGenericName, String classGenericName, String builderImplClassName) { JavacTreeMaker maker = type.getTreeMaker(); List annotations = List.nil(); if (inherited) { JCAnnotation overrideAnnotation = maker.Annotation(genJavaLangTypeRef(type, "Override"), List.nil()); annotations = List.of(overrideAnnotation); } JCModifiers modifiers = maker.Modifiers(Flags.PROTECTED, annotations); Name name = type.toName(FILL_VALUES_METHOD_NAME); JCExpression returnType = maker.Ident(type.toName(builderGenericName)); JCExpression classGenericNameExpr = maker.Ident(type.toName(classGenericName)); JCVariableDecl param = maker.VarDef(maker.Modifiers(Flags.LocalVarFlags), type.toName(INSTANCE_VARIABLE_NAME), classGenericNameExpr, null); ListBuffer body = new ListBuffer(); if (inherited) { // Call super. JCMethodInvocation callToSuper = maker.Apply(List.nil(), maker.Select(maker.Ident(type.toName("super")), name), List.of(maker.Ident(type.toName(INSTANCE_VARIABLE_NAME)))); body.append(maker.Exec(callToSuper)); } // Call the builder implemention's helper method that actually fills the values from the instance. JCMethodInvocation callStaticFillValuesMethod = maker.Apply(List.nil(), maker.Select(maker.Ident(type.toName(builderImplClassName)), type.toName(STATIC_FILL_VALUES_METHOD_NAME)), List.of(maker.Ident(type.toName(INSTANCE_VARIABLE_NAME)), maker.Ident(type.toName("this")))); body.append(maker.Exec(callStaticFillValuesMethod)); JCReturn returnStatement = maker.Return(maker.Apply(List.nil(), maker.Ident(type.toName(SELF_METHOD)), List.nil())); body.append(returnStatement); JCBlock bodyBlock = maker.Block(0, body.toList()); return maker.MethodDef(modifiers, name, returnType, List.nil(), List.of(param), List.nil(), bodyBlock, null); } /** * Generates a $fillValuesFromInstanceIntoBuilder() method in * the builder implementation class that copies all fields from the instance * to the builder. It looks like this: * * 
	 * protected B $fillValuesFromInstanceIntoBuilder(Foobar instance, FoobarBuilder<?, ?> b) {
	 * 	b.field(instance.field);
	 * }
	 *
*/ private JCMethodDecl generateStaticFillValuesMethod(JavacNode type, String builderClassname, List typeParams, java.util.List builderFields) { JavacTreeMaker maker = type.getTreeMaker(); List annotations = List.nil(); JCModifiers modifiers = maker.Modifiers(Flags.PRIVATE | Flags.STATIC, annotations); Name name = type.toName(STATIC_FILL_VALUES_METHOD_NAME); JCExpression returnType = maker.TypeIdent(CTC_VOID); // 1st parameter: "Foobar instance" JCVariableDecl paramInstance = maker.VarDef(maker.Modifiers(Flags.LocalVarFlags), type.toName(INSTANCE_VARIABLE_NAME), cloneSelfType(type), null); // 2nd parameter: "FoobarBuilder b" (plus generics on the annotated type) // First add all generics that are present on the parent type. ListBuffer typeParamsForBuilderParameter = getTypeParamExpressions(typeParams, maker); // Now add the . JCWildcard wildcard = maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null); typeParamsForBuilderParameter.add(wildcard); wildcard = maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null); typeParamsForBuilderParameter.add(wildcard); JCTypeApply builderType = maker.TypeApply(maker.Ident(type.toName(builderClassname)), typeParamsForBuilderParameter.toList()); JCVariableDecl paramBuilder = maker.VarDef(maker.Modifiers(Flags.LocalVarFlags), type.toName(BUILDER_VARIABLE_NAME), builderType, null); ListBuffer body = new ListBuffer(); // Call the builder's setter methods to fill the values from the instance. for (BuilderFieldData bfd : builderFields) { JCExpressionStatement exec = createSetterCallWithInstanceValue(bfd, type, maker); body.append(exec); } JCBlock bodyBlock = maker.Block(0, body.toList()); return maker.MethodDef(modifiers, name, returnType, copyTypeParams(type, typeParams), List.of(paramInstance, paramBuilder), List.nil(), bodyBlock, null); } private JCExpressionStatement createSetterCallWithInstanceValue(BuilderFieldData bfd, JavacNode type, JavacTreeMaker maker) { JCExpression[] tgt = new JCExpression[bfd.singularData == null ? 1 : 2]; if (bfd.obtainVia == null || !bfd.obtainVia.field().isEmpty()) { for (int i = 0; i < tgt.length; i++) { tgt[i] = maker.Select(maker.Ident(type.toName(INSTANCE_VARIABLE_NAME)), bfd.obtainVia == null ? bfd.rawName : type.toName(bfd.obtainVia.field())); } } else { if (bfd.obtainVia.isStatic()) { for (int i = 0; i < tgt.length; i++) { JCExpression c = maker.Select(maker.Ident(type.toName(type.getName())), type.toName(bfd.obtainVia.method())); tgt[i] = maker.Apply(List.nil(), c, List.of(maker.Ident(type.toName(INSTANCE_VARIABLE_NAME)))); } } else { for (int i = 0; i < tgt.length; i++) { JCExpression c = maker.Select(maker.Ident(type.toName(INSTANCE_VARIABLE_NAME)), type.toName(bfd.obtainVia.method())); tgt[i] = maker.Apply(List.nil(), c, List.nil()); } } } JCExpression arg; if (bfd.singularData == null) { arg = tgt[0]; } else { JCExpression eqNull = maker.Binary(CTC_EQUAL, tgt[0], maker.Literal(CTC_BOT, null)); JCExpression emptyList = maker.Apply(List.nil(), chainDots(type, "java", "util", "Collections", "emptyList"), List.nil()); arg = maker.Conditional(eqNull, emptyList, tgt[1]); } JCMethodInvocation apply = maker.Apply(List.nil(), maker.Select(maker.Ident(type.toName(BUILDER_VARIABLE_NAME)), bfd.name), List.of(arg)); JCExpressionStatement exec = maker.Exec(apply); return exec; } private JCMethodDecl generateAbstractSelfMethod(JavacNode type, boolean override, String builderGenericName) { JavacTreeMaker maker = type.getTreeMaker(); List annotations = List.nil(); if (override) { JCAnnotation overrideAnnotation = maker.Annotation(genJavaLangTypeRef(type, "Override"), List.nil()); annotations = List.of(overrideAnnotation); } JCModifiers modifiers = maker.Modifiers(Flags.PROTECTED | Flags.ABSTRACT, annotations); Name name = type.toName(SELF_METHOD); JCExpression returnType = maker.Ident(type.toName(builderGenericName)); return maker.MethodDef(modifiers, name, returnType, List.nil(), List.nil(), List.nil(), null, null); } private JCMethodDecl generateSelfMethod(JavacNode builderImplType, List typeParams) { JavacTreeMaker maker = builderImplType.getTreeMaker(); JCAnnotation overrideAnnotation = maker.Annotation(genJavaLangTypeRef(builderImplType, "Override"), List.nil()); JCModifiers modifiers = maker.Modifiers(Flags.PROTECTED, List.of(overrideAnnotation)); Name name = builderImplType.toName(SELF_METHOD); JCExpression returnType = namePlusTypeParamsToTypeReference(maker, builderImplType.toName(builderImplType.getName()), typeParams); JCStatement statement = maker.Return(maker.Ident(builderImplType.toName("this"))); JCBlock body = maker.Block(0, List.of(statement)); return maker.MethodDef(modifiers, name, returnType, List.nil(), List.nil(), List.nil(), body, null); } private JCMethodDecl generateAbstractBuildMethod(JavacNode type, String methodName, boolean override, String classGenericName) { JavacTreeMaker maker = type.getTreeMaker(); List annotations = List.nil(); if (override) { JCAnnotation overrideAnnotation = maker.Annotation(genJavaLangTypeRef(type, "Override"), List.nil()); annotations = List.of(overrideAnnotation); } JCModifiers modifiers = maker.Modifiers(Flags.PUBLIC | Flags.ABSTRACT, annotations); Name name = type.toName(methodName); JCExpression returnType = maker.Ident(type.toName(classGenericName)); return maker.MethodDef(modifiers, name, returnType, List.nil(), List.nil(), List.nil(), null, null); } private JCMethodDecl generateBuildMethod(String buildName, JavacNode returnType, JavacNode type, List thrownExceptions) { JavacTreeMaker maker = type.getTreeMaker(); JCExpression call; ListBuffer statements = new ListBuffer(); // Use a constructor that only has this builder as parameter. List builderArg = List.of(maker.Ident(type.toName("this"))); call = maker.NewClass(null, List.nil(), cloneSelfType(returnType), builderArg, null); statements.append(maker.Return(call)); JCBlock body = maker.Block(0, statements.toList()); JCAnnotation overrideAnnotation = maker.Annotation(genJavaLangTypeRef(type, "Override"), List.nil()); JCModifiers modifiers = maker.Modifiers(Flags.PUBLIC, List.of(overrideAnnotation)); return maker.MethodDef(modifiers, type.toName(buildName), cloneSelfType(returnType), List.nil(), List.nil(), thrownExceptions, body, null); } private JCMethodDecl generateCleanMethod(java.util.List builderFields, JavacNode type, JCTree source) { JavacTreeMaker maker = type.getTreeMaker(); ListBuffer statements = new ListBuffer(); for (BuilderFieldData bfd : builderFields) { if (bfd.singularData != null && bfd.singularData.getSingularizer() != null) { bfd.singularData.getSingularizer().appendCleaningCode(bfd.singularData, type, source, statements); } } statements.append(maker.Exec(maker.Assign(maker.Select(maker.Ident(type.toName("this")), type.toName("$lombokUnclean")), maker.Literal(CTC_BOOLEAN, 0)))); JCBlock body = maker.Block(0, statements.toList()); return maker.MethodDef(maker.Modifiers(Flags.PUBLIC), type.toName("$lombokClean"), maker.Type(Javac.createVoidType(type.getSymbolTable(), CTC_VOID)), List.nil(), List.nil(), List.nil(), body, null); } private void generateBuilderFields(JavacNode builderType, java.util.List builderFields, JCTree source) { int len = builderFields.size(); java.util.List existing = new ArrayList(); for (JavacNode child : builderType.down()) { if (child.getKind() == Kind.FIELD) existing.add(child); } java.util.List generated = new ArrayList(); for (int i = len - 1; i >= 0; i--) { BuilderFieldData bfd = builderFields.get(i); if (bfd.singularData != null && bfd.singularData.getSingularizer() != null) { bfd.createdFields.addAll(bfd.singularData.getSingularizer().generateFields(bfd.singularData, builderType, source)); } else { JavacNode field = null, setFlag = null; for (JavacNode exists : existing) { Name n = ((JCVariableDecl) exists.get()).name; if (n.equals(bfd.name)) field = exists; if (n.equals(bfd.nameOfSetFlag)) setFlag = exists; } JavacTreeMaker maker = builderType.getTreeMaker(); if (field == null) { JCModifiers mods = maker.Modifiers(Flags.PRIVATE); JCVariableDecl newField = maker.VarDef(mods, bfd.name, cloneType(maker, bfd.type, source, builderType.getContext()), null); field = injectFieldAndMarkGenerated(builderType, newField); generated.add(newField); } if (setFlag == null && bfd.nameOfSetFlag != null) { JCModifiers mods = maker.Modifiers(Flags.PRIVATE); JCVariableDecl newField = maker.VarDef(mods, bfd.nameOfSetFlag, maker.TypeIdent(CTC_BOOLEAN), null); injectFieldAndMarkGenerated(builderType, newField); generated.add(newField); } bfd.createdFields.add(field); } } for (JCVariableDecl gen : generated) recursiveSetGeneratedBy(gen, source, builderType.getContext()); } private void generateSetterMethodsForBuilder(final JavacNode builderType, BuilderFieldData fieldNode, JavacNode source, final String builderGenericName) { boolean deprecate = isFieldDeprecated(fieldNode.originalFieldNode); final JavacTreeMaker maker = builderType.getTreeMaker(); ExpressionMaker returnTypeMaker = new ExpressionMaker() { @Override public JCExpression make() { return maker.Ident(builderType.toName(builderGenericName)); }}; StatementMaker returnStatementMaker = new StatementMaker() { @Override public JCStatement make() { return maker.Return(maker.Apply(List.nil(), maker.Ident(builderType.toName(SELF_METHOD)), List.nil())); }}; if (fieldNode.singularData == null || fieldNode.singularData.getSingularizer() == null) { generateSimpleSetterMethodForBuilder(builderType, deprecate, fieldNode.createdFields.get(0), fieldNode.nameOfSetFlag, source, true, returnTypeMaker.make(), returnStatementMaker.make(), fieldNode.annotations); } else { fieldNode.singularData.getSingularizer().generateMethods(fieldNode.singularData, deprecate, builderType, source.get(), true, returnTypeMaker, returnStatementMaker); } } private void generateSimpleSetterMethodForBuilder(JavacNode builderType, boolean deprecate, JavacNode fieldNode, Name nameOfSetFlag, JavacNode source, boolean fluent, JCExpression returnType, JCStatement returnStatement, List annosOnParam) { Name fieldName = ((JCVariableDecl) fieldNode.get()).name; for (JavacNode child : builderType.down()) { if (child.getKind() != Kind.METHOD) continue; JCMethodDecl methodDecl = (JCMethodDecl) child.get(); Name existingName = methodDecl.name; if (existingName.equals(fieldName) && !isTolerate(fieldNode, methodDecl)) return; } String setterName = fluent ? fieldNode.getName() : HandlerUtil.buildAccessorName("set", fieldNode.getName()); JavacTreeMaker maker = fieldNode.getTreeMaker(); JCMethodDecl newMethod = HandleSetter.createSetter(Flags.PUBLIC, deprecate, fieldNode, maker, setterName, nameOfSetFlag, returnType, returnStatement, source, List.nil(), annosOnParam); injectMethod(builderType, newMethod); } private void addObtainVia(BuilderFieldData bfd, JavacNode node) { for (JavacNode child : node.down()) { if (!annotationTypeMatches(ObtainVia.class, child)) continue; AnnotationValues ann = createAnnotation(ObtainVia.class, child); bfd.obtainVia = ann.getInstance(); bfd.obtainViaNode = child; deleteAnnotationIfNeccessary(child, ObtainVia.class); return; } } /** * Returns the explicitly requested singular annotation on this node (field * or parameter), or null if there's no {@code @Singular} annotation on it. * * @param node The node (field or method param) to inspect for its name and potential {@code @Singular} annotation. */ private SingularData getSingularData(JavacNode node) { for (JavacNode child : node.down()) { if (!annotationTypeMatches(Singular.class, child)) continue; Name pluralName = node.getKind() == Kind.FIELD ? removePrefixFromField(node) : ((JCVariableDecl) node.get()).name; AnnotationValues ann = createAnnotation(Singular.class, child); deleteAnnotationIfNeccessary(child, Singular.class); String explicitSingular = ann.getInstance().value(); if (explicitSingular.isEmpty()) { if (Boolean.FALSE.equals(node.getAst().readConfiguration(ConfigurationKeys.SINGULAR_AUTO))) { node.addError("The singular must be specified explicitly (e.g. @Singular(\"task\")) because auto singularization is disabled."); explicitSingular = pluralName.toString(); } else { explicitSingular = autoSingularize(pluralName.toString()); if (explicitSingular == null) { node.addError("Can't singularize this name; please specify the singular explicitly (i.e. @Singular(\"sheep\"))"); explicitSingular = pluralName.toString(); } } } Name singularName = node.toName(explicitSingular); JCExpression type = null; if (node.get() instanceof JCVariableDecl) type = ((JCVariableDecl) node.get()).vartype; String name = null; List typeArgs = List.nil(); if (type instanceof JCTypeApply) { typeArgs = ((JCTypeApply) type).arguments; type = ((JCTypeApply) type).clazz; } name = type.toString(); String targetFqn = JavacSingularsRecipes.get().toQualified(name); JavacSingularizer singularizer = JavacSingularsRecipes.get().getSingularizer(targetFqn); if (singularizer == null) { node.addError("Lombok does not know how to create the singular-form builder methods for type '" + name + "'; they won't be generated."); return null; } return new SingularData(child, singularName, pluralName, typeArgs, targetFqn, singularizer); } return null; } private String generateNonclashingNameFor(String classGenericName, java.util.List typeParamStrings) { if (!typeParamStrings.contains(classGenericName)) return classGenericName; int counter = 2; while (typeParamStrings.contains(classGenericName + counter)) counter++; return classGenericName + counter; } private JavacNode findInnerClass(JavacNode parent, String name) { for (JavacNode child : parent.down()) { if (child.getKind() != Kind.TYPE) continue; JCClassDecl td = (JCClassDecl) child.get(); if (td.name.contentEquals(name)) return child; } return null; } private ListBuffer getTypeParamExpressions(List typeParams, JavacTreeMaker maker) { ListBuffer typeParamsForBuilderParameter = new ListBuffer(); for (JCTree typeParam : typeParams) { if (typeParam instanceof JCTypeParameter) { typeParamsForBuilderParameter.add(maker.Ident(((JCTypeParameter)typeParam).getName())); } else if (typeParam instanceof JCIdent) { typeParamsForBuilderParameter.add(maker.Ident(((JCIdent)typeParam).getName())); } } return typeParamsForBuilderParameter; } }