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/*
* Copyright (C) 2020 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.handleExperimentalFlagUsage;
import static lombok.javac.handlers.JavacHandlerUtil.*;
import org.mangosdk.spi.ProviderFor;
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.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCTypeApply;
import com.sun.tools.javac.tree.JCTree.JCTypeParameter;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.ListBuffer;
import lombok.Builder;
import lombok.ConfigurationKeys;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.core.HandlerPriority;
import lombok.core.handlers.HandlerUtil;
import lombok.experimental.SuperBuilder;
import lombok.extern.jackson.Jacksonized;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import lombok.javac.JavacTreeMaker;
/**
* This (javac) handler deals with {@code @Jacksonized} modifying the (already
* generated) {@code @Builder} or {@code @SuperBuilder} to conform to Jackson's
* needs for builders.
*/
@ProviderFor(JavacAnnotationHandler.class)
@HandlerPriority(-512) // Above Handle(Super)Builder's level (builders must be already generated).
public class HandleJacksonized extends JavacAnnotationHandler<Jacksonized> {
@Override public void handle(AnnotationValues<Jacksonized> annotation, JCAnnotation ast, JavacNode annotationNode) {
handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.JACKSONIZED_FLAG_USAGE, "@Jacksonized");
JavacNode annotatedNode = annotationNode.up();
deleteAnnotationIfNeccessary(annotationNode, Jacksonized.class);
JavacNode tdNode;
if (annotatedNode.getKind() != Kind.TYPE)
tdNode = annotatedNode.up(); // @Jacksonized on a constructor or a static factory method.
else
tdNode = annotatedNode; // @Jacksonized on the class.
JCClassDecl td = (JCClassDecl) tdNode.get();
JavacNode builderAnnotationNode = findAnnotation(Builder.class, annotatedNode);
JavacNode superBuilderAnnotationNode = findAnnotation(SuperBuilder.class, annotatedNode);
if (builderAnnotationNode == null && superBuilderAnnotationNode == null) {
annotationNode.addWarning("@Jacksonized requires @Builder or @SuperBuilder for it to mean anything.");
return;
}
if (builderAnnotationNode != null && superBuilderAnnotationNode != null) {
annotationNode.addError("@Jacksonized cannot process both @Builder and @SuperBuilder on the same class.");
return;
}
boolean isAbstract = (td.mods.flags & Flags.ABSTRACT) != 0;
if (isAbstract) {
annotationNode.addError("Builders on abstract classes cannot be @Jacksonized (the builder would never be used).");
return;
}
AnnotationValues<Builder> builderAnnotation = builderAnnotationNode != null ?
createAnnotation(Builder.class, builderAnnotationNode) :
null;
AnnotationValues<SuperBuilder> superBuilderAnnotation = superBuilderAnnotationNode != null ?
createAnnotation(SuperBuilder.class, superBuilderAnnotationNode) :
null;
String setPrefix = builderAnnotation != null ?
builderAnnotation.getInstance().setterPrefix() :
superBuilderAnnotation.getInstance().setterPrefix();
String buildMethodName = builderAnnotation != null ?
builderAnnotation.getInstance().buildMethodName() :
superBuilderAnnotation.getInstance().buildMethodName();
JavacTreeMaker maker = annotatedNode.getTreeMaker();
// Now lets find the generated builder class.
String builderClassName = getBuilderClassName(ast, annotationNode, annotatedNode, td, builderAnnotation, maker);
JCClassDecl builderClass = null;
for (JCTree member : td.getMembers()) {
if (member instanceof JCClassDecl && ((JCClassDecl) member).getSimpleName().contentEquals(builderClassName)) {
builderClass = (JCClassDecl) member;
break;
}
}
if (builderClass == null) {
annotationNode.addError("Could not find @(Super)Builder's generated builder class for @Jacksonized processing. If there are other compiler errors, fix them first.");
return;
}
// Insert @JsonDeserialize on annotated class.
if (hasAnnotation("com.fasterxml.jackson.databind.annotation.JsonDeserialize", tdNode)) {
annotationNode.addError("@JsonDeserialize already exists on class. Either delete @JsonDeserialize, or remove @Jacksonized and manually configure Jackson.");
return;
}
JCExpression jsonDeserializeType = chainDots(annotatedNode, "com", "fasterxml", "jackson", "databind", "annotation", "JsonDeserialize");
JCExpression builderClassExpression = namePlusTypeParamsToTypeReference(maker, tdNode, annotationNode.toName(builderClassName), false, List.<JCTypeParameter>nil());
JCFieldAccess builderClassReference = maker.Select(builderClassExpression, annotatedNode.toName("class"));
JCExpression assign = maker.Assign(maker.Ident(annotationNode.toName("builder")), builderClassReference);
JCAnnotation annotationJsonDeserialize = maker.Annotation(jsonDeserializeType, List.of(assign));
td.mods.annotations = td.mods.annotations.append(annotationJsonDeserialize);
// Copy annotations from the class to the builder class.
List<JCAnnotation> copyableAnnotations = findJacksonAnnotationsOnClass(tdNode);
List<JCAnnotation> copiedAnnotations = copyAnnotations(copyableAnnotations);
builderClass.mods.annotations = builderClass.mods.annotations.appendList(copiedAnnotations);
// Insert @JsonPOJOBuilder on the builder class.
JCExpression jsonPOJOBuilderType = chainDots(annotatedNode, "com", "fasterxml", "jackson", "databind", "annotation", "JsonPOJOBuilder");
JCExpression withPrefixExpr = maker.Assign(maker.Ident(annotationNode.toName("withPrefix")), maker.Literal(setPrefix));
JCExpression buildMethodNameExpr = maker.Assign(maker.Ident(annotationNode.toName("buildMethodName")), maker.Literal(buildMethodName));
JCAnnotation annotationJsonPOJOBuilder = maker.Annotation(jsonPOJOBuilderType, List.of(withPrefixExpr, buildMethodNameExpr));
builderClass.mods.annotations = builderClass.mods.annotations.append(annotationJsonPOJOBuilder);
// @SuperBuilder? Make it package-private!
if (superBuilderAnnotationNode != null)
builderClass.mods.flags = builderClass.mods.flags & ~Flags.PRIVATE;
}
private String getBuilderClassName(JCAnnotation ast, JavacNode annotationNode, JavacNode annotatedNode, JCClassDecl td, AnnotationValues<Builder> builderAnnotation, JavacTreeMaker maker) {
String builderClassName = builderAnnotation != null ?
builderAnnotation.getInstance().builderClassName() : null;
if (builderClassName == null || builderClassName.isEmpty()) {
builderClassName = annotationNode.getAst().readConfiguration(ConfigurationKeys.BUILDER_CLASS_NAME);
if (builderClassName == null || builderClassName.isEmpty())
builderClassName = "*Builder";
JCMethodDecl fillParametersFrom = annotatedNode.get() instanceof JCMethodDecl ? (JCMethodDecl)annotatedNode.get() : null;
String replacement;
if (fillParametersFrom != null && !fillParametersFrom.getName().toString().equals("<init>")) {
// @Builder on a method: Use name of return type for builder class name.
JCExpression returnType = fillParametersFrom.restype;
List<JCTypeParameter> typeParams = fillParametersFrom.typarams;
if (returnType instanceof JCTypeApply) {
returnType = cloneType(maker, returnType, ast, annotationNode.getContext());
}
replacement = HandleBuilder.returnTypeToBuilderClassName(annotationNode, td, returnType, typeParams);
} else {
// @Builder on class or constructor: Use the class name.
replacement = td.name.toString();
}
builderClassName = builderClassName.replace("*", replacement);
}
if (builderAnnotation == null)
builderClassName += "Impl"; // For @SuperBuilder, all Jackson annotations must be put on the BuilderImpl class.
return builderClassName;
}
private static List<JCAnnotation> findJacksonAnnotationsOnClass(JavacNode node) {
ListBuffer<JCAnnotation> result = new ListBuffer<JCAnnotation>();
for (JavacNode child : node.down()) {
if (child.getKind() == Kind.ANNOTATION) {
JCAnnotation annotation = (JCAnnotation) child.get();
for (String bn : HandlerUtil.JACKSON_COPY_TO_BUILDER_ANNOTATIONS) {
if (typeMatches(bn, node, annotation.annotationType)) {
result.append(annotation);
break;
}
}
}
}
return result.toList();
}
}
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