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/*
* Copyright (C) 2014-2021 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.handleExperimentalFlagUsage;
import static lombok.javac.handlers.JavacHandlerUtil.*;
import java.util.ArrayList;
import lombok.AccessLevel;
import lombok.ConfigurationKeys;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.core.configuration.IdentifierName;
import lombok.core.handlers.HandlerUtil;
import lombok.experimental.FieldNameConstants;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import lombok.javac.JavacTreeMaker;
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.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCModifiers;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCTypeParameter;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.Name;
@Provides
public class HandleFieldNameConstants extends JavacAnnotationHandler<FieldNameConstants> {
private static final IdentifierName FIELDS = IdentifierName.valueOf("Fields");
public void generateFieldNameConstantsForType(JavacNode typeNode, JavacNode errorNode, AccessLevel level, boolean asEnum, IdentifierName innerTypeName, boolean onlyExplicit, boolean uppercase) {
if (!isClassEnumOrRecord(typeNode)) {
errorNode.addError("@FieldNameConstants is only supported on a class, an enum or a record.");
return;
}
if (!isStaticAllowed(typeNode)) {
errorNode.addError("@FieldNameConstants is not supported on non-static nested classes.");
return;
}
java.util.List<JavacNode> qualified = new ArrayList<JavacNode>();
for (JavacNode field : typeNode.down()) {
if (fieldQualifiesForFieldNameConstantsGeneration(field, onlyExplicit)) qualified.add(field);
}
if (qualified.isEmpty()) {
errorNode.addWarning("No fields qualify for @FieldNameConstants, therefore this annotation does nothing");
} else {
createInnerTypeFieldNameConstants(typeNode, errorNode, level, qualified, asEnum, innerTypeName, uppercase);
}
}
private boolean fieldQualifiesForFieldNameConstantsGeneration(JavacNode field, boolean onlyExplicit) {
if (field.getKind() != Kind.FIELD) return false;
boolean exclAnn = JavacHandlerUtil.hasAnnotationAndDeleteIfNeccessary(FieldNameConstants.Exclude.class, field);
boolean inclAnn = JavacHandlerUtil.hasAnnotationAndDeleteIfNeccessary(FieldNameConstants.Include.class, field);
if (exclAnn) return false;
if (inclAnn) return true;
if (onlyExplicit) return false;
JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
if (fieldDecl.name.toString().startsWith("$")) return false;
if ((fieldDecl.mods.flags & Flags.STATIC) != 0) return false;
return true;
}
public void handle(AnnotationValues<FieldNameConstants> annotation, JCAnnotation ast, JavacNode annotationNode) {
handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.FIELD_NAME_CONSTANTS_FLAG_USAGE, "@FieldNameConstants");
deleteAnnotationIfNeccessary(annotationNode, FieldNameConstants.class);
deleteImportFromCompilationUnit(annotationNode, "lombok.AccessLevel");
JavacNode node = annotationNode.up();
FieldNameConstants annotationInstance = annotation.getInstance();
AccessLevel level = annotationInstance.level();
boolean asEnum = annotationInstance.asEnum();
boolean usingLombokv1_18_2 = annotation.isExplicit("prefix") || annotation.isExplicit("suffix") || node.getKind() == Kind.FIELD;
if (usingLombokv1_18_2) {
annotationNode.addError("@FieldNameConstants has been redesigned in lombok v1.18.4; please upgrade your project dependency on lombok. See https://projectlombok.org/features/experimental/FieldNameConstants for more information.");
return;
}
if (level == AccessLevel.NONE) {
annotationNode.addWarning("AccessLevel.NONE is not compatible with @FieldNameConstants. If you don't want the inner type, simply remove @FieldNameConstants.");
return;
}
IdentifierName innerTypeName;
try {
innerTypeName = IdentifierName.valueOf(annotationInstance.innerTypeName());
} catch(IllegalArgumentException e) {
annotationNode.addError("InnerTypeName " + annotationInstance.innerTypeName() + " is not a valid Java identifier.");
return;
}
if (innerTypeName == null) innerTypeName = annotationNode.getAst().readConfiguration(ConfigurationKeys.FIELD_NAME_CONSTANTS_INNER_TYPE_NAME);
if (innerTypeName == null) innerTypeName = FIELDS;
Boolean uppercase = annotationNode.getAst().readConfiguration(ConfigurationKeys.FIELD_NAME_CONSTANTS_UPPERCASE);
if (uppercase == null) uppercase = false;
generateFieldNameConstantsForType(node, annotationNode, level, asEnum, innerTypeName, annotationInstance.onlyExplicitlyIncluded(), uppercase);
}
private void createInnerTypeFieldNameConstants(JavacNode typeNode, JavacNode errorNode, AccessLevel level, java.util.List<JavacNode> fields, boolean asEnum, IdentifierName innerTypeName, boolean uppercase) {
if (fields.isEmpty()) return;
JavacTreeMaker maker = typeNode.getTreeMaker();
JCModifiers mods = maker.Modifiers(toJavacModifier(level) | (asEnum ? Flags.ENUM : Flags.STATIC | Flags.FINAL));
Name fieldsName = typeNode.toName(innerTypeName.getName());
JavacNode fieldsType = findInnerClass(typeNode, innerTypeName.getName());
boolean genConstr = false;
if (fieldsType == null) {
JCClassDecl innerType = maker.ClassDef(mods, fieldsName, List.<JCTypeParameter>nil(), null, List.<JCExpression>nil(), List.<JCTree>nil());
fieldsType = injectType(typeNode, innerType);
recursiveSetGeneratedBy(innerType, errorNode);
genConstr = true;
} else {
JCClassDecl builderTypeDeclaration = (JCClassDecl) fieldsType.get();
long f = builderTypeDeclaration.getModifiers().flags;
if (asEnum && (f & Flags.ENUM) == 0) {
errorNode.addError("Existing " + innerTypeName + " must be declared as an 'enum'.");
return;
}
if (!asEnum && (f & Flags.STATIC) == 0) {
errorNode.addError("Existing " + innerTypeName + " must be declared as a 'static class'.");
return;
}
genConstr = constructorExists(fieldsType) == MemberExistsResult.NOT_EXISTS;
}
if (genConstr) {
JCModifiers genConstrMods = maker.Modifiers(Flags.GENERATEDCONSTR | (asEnum ? 0L : Flags.PRIVATE));
JCBlock genConstrBody = maker.Block(0L, List.<JCStatement>of(maker.Exec(maker.Apply(List.<JCExpression>nil(), maker.Ident(typeNode.toName("super")), List.<JCExpression>nil()))));
JCMethodDecl c = maker.MethodDef(genConstrMods, typeNode.toName("<init>"), null, List.<JCTypeParameter>nil(), List.<JCVariableDecl>nil(), List.<JCExpression>nil(), genConstrBody, null);
recursiveSetGeneratedBy(c, errorNode);
injectMethod(fieldsType, c);
}
java.util.List<JCVariableDecl> generated = new ArrayList<JCVariableDecl>();
for (JavacNode field : fields) {
Name fName = ((JCVariableDecl) field.get()).name;
if (uppercase) fName = typeNode.toName(HandlerUtil.camelCaseToConstant(fName.toString()));
if (fieldExists(fName.toString(), fieldsType) != MemberExistsResult.NOT_EXISTS) continue;
JCModifiers constantValueMods = maker.Modifiers(Flags.PUBLIC | Flags.STATIC | Flags.FINAL | (asEnum ? Flags.ENUM : 0L));
JCExpression returnType;
JCExpression init;
if (asEnum) {
returnType = maker.Ident(fieldsName);
init = maker.NewClass(null, List.<JCExpression>nil(), maker.Ident(fieldsName), List.<JCExpression>nil(), null);
} else {
returnType = chainDots(field, "java", "lang", "String");
init = maker.Literal(field.getName());
}
JCVariableDecl constantField = maker.VarDef(constantValueMods, fName, returnType, init);
injectField(fieldsType, constantField, false, true);
setGeneratedBy(constantField, errorNode);
generated.add(constantField);
}
for (JCVariableDecl cf : generated) recursiveSetGeneratedBy(cf, errorNode);
}
}
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