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/*
* Copyright (C) 2012-2021 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.handlers.JavacHandlerUtil.*;
import lombok.AccessLevel;
import lombok.ConfigurationKeys;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.core.HandlerPriority;
import lombok.experimental.FieldDefaults;
import lombok.experimental.NonFinal;
import lombok.experimental.PackagePrivate;
import lombok.javac.JavacASTAdapter;
import lombok.javac.JavacASTVisitor;
import lombok.javac.JavacNode;
import lombok.spi.Provides;
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.JCVariableDecl;
/**
* Handles the {@code lombok.FieldDefaults} annotation for javac.
*/
@Provides(JavacASTVisitor.class)
@HandlerPriority(-2048) //-2^11; to ensure @Value picks up on messing with the fields' 'final' state, run earlier.
public class HandleFieldDefaults extends JavacASTAdapter {
public boolean generateFieldDefaultsForType(JavacNode typeNode, JavacNode errorNode, AccessLevel level, boolean makeFinal, boolean checkForTypeLevelFieldDefaults) {
if (checkForTypeLevelFieldDefaults) {
if (hasAnnotation(FieldDefaults.class, typeNode)) {
//The annotation will make it happen, so we can skip it.
return true;
}
}
if (!isClassOrEnum(typeNode)) {
errorNode.addError("@FieldDefaults is only supported on a class or an enum.");
return false;
}
for (JavacNode field : typeNode.down()) {
if (field.getKind() != Kind.FIELD) continue;
JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
//Skip fields that start with $
if (fieldDecl.name.toString().startsWith("$")) continue;
setFieldDefaultsForField(field, level, makeFinal);
}
return true;
}
public void setFieldDefaultsForField(JavacNode fieldNode, AccessLevel level, boolean makeFinal) {
JCVariableDecl field = (JCVariableDecl) fieldNode.get();
if (level != null && level != AccessLevel.NONE) {
if ((field.mods.flags & (Flags.PUBLIC | Flags.PRIVATE | Flags.PROTECTED)) == 0) {
if (!hasAnnotationAndDeleteIfNeccessary(PackagePrivate.class, fieldNode)) {
if ((field.mods.flags & Flags.STATIC) == 0) {
field.mods.flags |= toJavacModifier(level);
}
}
}
}
if (makeFinal && (field.mods.flags & Flags.FINAL) == 0) {
if (!hasAnnotationAndDeleteIfNeccessary(NonFinal.class, fieldNode)) {
if ((field.mods.flags & Flags.STATIC) == 0) {
field.mods.flags |= Flags.FINAL;
}
}
}
fieldNode.rebuild();
}
@Override public void visitType(JavacNode typeNode, JCClassDecl type) {
AnnotationValues<FieldDefaults> fieldDefaults = null;
JavacNode source = typeNode;
boolean levelIsExplicit = false;
boolean makeFinalIsExplicit = false;
FieldDefaults fd = null;
for (JavacNode jn : typeNode.down()) {
if (jn.getKind() != Kind.ANNOTATION) continue;
JCAnnotation ann = (JCAnnotation) jn.get();
JCTree typeTree = ann.annotationType;
if (typeTree == null) continue;
String typeTreeToString = typeTree.toString();
if (!typeTreeToString.equals("FieldDefaults") && !typeTreeToString.equals("lombok.experimental.FieldDefaults")) continue;
if (!typeMatches(FieldDefaults.class, jn, typeTree)) continue;
source = jn;
fieldDefaults = createAnnotation(FieldDefaults.class, jn);
levelIsExplicit = fieldDefaults.isExplicit("level");
makeFinalIsExplicit = fieldDefaults.isExplicit("makeFinal");
handleExperimentalFlagUsage(jn, ConfigurationKeys.FIELD_DEFAULTS_FLAG_USAGE, "@FieldDefaults");
fd = fieldDefaults.getInstance();
if (!levelIsExplicit && !makeFinalIsExplicit) {
jn.addError("This does nothing; provide either level or makeFinal or both.");
}
if (levelIsExplicit && fd.level() == AccessLevel.NONE) {
jn.addError("AccessLevel.NONE doesn't mean anything here. Pick another value.");
levelIsExplicit = false;
}
deleteAnnotationIfNeccessary(jn, FieldDefaults.class);
deleteImportFromCompilationUnit(jn, "lombok.AccessLevel");
break;
}
if (fd == null && (type.mods.flags & (Flags.INTERFACE | Flags.ANNOTATION)) != 0) return;
boolean defaultToPrivate = levelIsExplicit ? false : Boolean.TRUE.equals(typeNode.getAst().readConfiguration(ConfigurationKeys.FIELD_DEFAULTS_PRIVATE_EVERYWHERE));
boolean defaultToFinal = makeFinalIsExplicit ? false : Boolean.TRUE.equals(typeNode.getAst().readConfiguration(ConfigurationKeys.FIELD_DEFAULTS_FINAL_EVERYWHERE));
if (!defaultToPrivate && !defaultToFinal && fieldDefaults == null) return;
// Do not apply field defaults to records if set using the config system
if (fieldDefaults == null && !isClassOrEnum(typeNode)) return;
AccessLevel fdAccessLevel = (fieldDefaults != null && levelIsExplicit) ? fd.level() : defaultToPrivate ? AccessLevel.PRIVATE : null;
boolean fdToFinal = (fieldDefaults != null && makeFinalIsExplicit) ? fd.makeFinal() : defaultToFinal;
generateFieldDefaultsForType(typeNode, source, fdAccessLevel, fdToFinal, false);
}
}
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