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/*
* Copyright (C) 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 com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.*;
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.ConfigurationKeys;
import lombok.experimental.StandardException;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.delombok.LombokOptionsFactory;
import lombok.javac.Javac;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import lombok.javac.JavacTreeMaker;
import lombok.javac.handlers.JavacHandlerUtil.*;
import lombok.spi.Provides;
import static lombok.core.handlers.HandlerUtil.handleFlagUsage;
import static lombok.javac.Javac.*;
import static lombok.javac.handlers.JavacHandlerUtil.*;
@Provides
public class HandleStandardException extends JavacAnnotationHandler<StandardException> {
@Override
public void handle(AnnotationValues<StandardException> annotation, JCAnnotation ast, JavacNode annotationNode) {
handleFlagUsage(annotationNode, ConfigurationKeys.STANDARD_EXCEPTION_FLAG_USAGE, "@StandardException");
deleteAnnotationIfNeccessary(annotationNode, StandardException.class);
deleteImportFromCompilationUnit(annotationNode, "lombok.AccessLevel");
JavacNode typeNode = annotationNode.up();
if (!isClass(typeNode)) {
annotationNode.addError("@StandardException is only supported on a class");
return;
}
JCTree extending = Javac.getExtendsClause((JCClassDecl) typeNode.get());
if (extending == null) {
annotationNode.addError("@StandardException requires that you extend a Throwable type");
return;
}
AccessLevel access = annotation.getInstance().access();
if (access == null) access = AccessLevel.PUBLIC;
if (access == AccessLevel.NONE) {
annotationNode.addError("AccessLevel.NONE is not valid here");
access = AccessLevel.PUBLIC;
}
generateNoArgsConstructor(typeNode, access, annotationNode);
generateMsgOnlyConstructor(typeNode, access, annotationNode);
generateCauseOnlyConstructor(typeNode, access, annotationNode);
generateFullConstructor(typeNode, access, annotationNode);
}
private void generateNoArgsConstructor(JavacNode typeNode, AccessLevel level, JavacNode source) {
if (hasConstructor(typeNode) != MemberExistsResult.NOT_EXISTS) return;
JavacTreeMaker maker = typeNode.getTreeMaker();
List<JCExpression> args = List.<JCExpression>of(maker.Literal(CTC_BOT, null), maker.Literal(CTC_BOT, null));
JCStatement thisCall = maker.Exec(maker.Apply(List.<JCExpression>nil(), maker.Ident(typeNode.toName("this")), args));
JCMethodDecl constr = createConstructor(level, typeNode, false, false, source, List.of(thisCall));
injectMethod(typeNode, constr);
}
private void generateMsgOnlyConstructor(JavacNode typeNode, AccessLevel level, JavacNode source) {
if (hasConstructor(typeNode, String.class) != MemberExistsResult.NOT_EXISTS) return;
JavacTreeMaker maker = typeNode.getTreeMaker();
List<JCExpression> args = List.<JCExpression>of(maker.Ident(typeNode.toName("message")), maker.Literal(CTC_BOT, null));
JCStatement thisCall = maker.Exec(maker.Apply(List.<JCExpression>nil(), maker.Ident(typeNode.toName("this")), args));
JCMethodDecl constr = createConstructor(level, typeNode, true, false, source, List.of(thisCall));
injectMethod(typeNode, constr);
}
private void generateCauseOnlyConstructor(JavacNode typeNode, AccessLevel level, JavacNode source) {
if (hasConstructor(typeNode, Throwable.class) != MemberExistsResult.NOT_EXISTS) return;
JavacTreeMaker maker = typeNode.getTreeMaker();
Name causeName = typeNode.toName("cause");
JCExpression causeDotGetMessage = maker.Apply(List.<JCExpression>nil(), maker.Select(maker.Ident(causeName), typeNode.toName("getMessage")), List.<JCExpression>nil());
JCExpression msgExpression = maker.Conditional(maker.Binary(CTC_NOT_EQUAL, maker.Ident(causeName), maker.Literal(CTC_BOT, null)), causeDotGetMessage, maker.Literal(CTC_BOT, null));
List<JCExpression> args = List.<JCExpression>of(msgExpression, maker.Ident(causeName));
JCStatement thisCall = maker.Exec(maker.Apply(List.<JCExpression>nil(), maker.Ident(typeNode.toName("this")), args));
JCMethodDecl constr = createConstructor(level, typeNode, false, true, source, List.of(thisCall));
injectMethod(typeNode, constr);
}
private void generateFullConstructor(JavacNode typeNode, AccessLevel level, JavacNode source) {
if (hasConstructor(typeNode, String.class, Throwable.class) != MemberExistsResult.NOT_EXISTS) return;
JavacTreeMaker maker = typeNode.getTreeMaker();
Name causeName = typeNode.toName("cause");
Name superName = typeNode.toName("super");
List<JCExpression> args = List.<JCExpression>of(maker.Ident(typeNode.toName("message")));
JCStatement superCall = maker.Exec(maker.Apply(List.<JCExpression>nil(), maker.Ident(superName), args));
JCExpression causeNotNull = maker.Binary(CTC_NOT_EQUAL, maker.Ident(causeName), maker.Literal(CTC_BOT, null));
JCStatement initCauseCall = maker.Exec(maker.Apply(List.<JCExpression>nil(), maker.Select(maker.Ident(superName), typeNode.toName("initCause")), List.<JCExpression>of(maker.Ident(causeName))));
JCStatement initCause = maker.If(causeNotNull, initCauseCall, null);
JCMethodDecl constr = createConstructor(level, typeNode, true, true, source, List.of(superCall, initCause));
injectMethod(typeNode, constr);
}
private static MemberExistsResult hasConstructor(JavacNode node, Class<?>... paramTypes) {
node = upToTypeNode(node);
if (node != null && node.get() instanceof JCClassDecl) {
for (JCTree def : ((JCClassDecl) node.get()).defs) {
if (def instanceof JCMethodDecl) {
JCMethodDecl md = (JCMethodDecl) def;
if (md.name.contentEquals("<init>") && (md.mods.flags & Flags.GENERATEDCONSTR) == 0) {
if (!paramsMatch(node, md.params, paramTypes)) continue;
return getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK;
}
}
}
}
return MemberExistsResult.NOT_EXISTS;
}
private static boolean paramsMatch(JavacNode node, List<JCVariableDecl> a, Class<?>[] b) {
if (a == null) return b == null || b.length == 0;
if (b == null) return a.size() == 0;
if (a.size() != b.length) return false;
for (int i = 0; i < a.size(); i++) {
JCVariableDecl param = a.get(i);
Class<?> c = b[i];
if (!typeMatches(c, node, param.vartype)) return false;
}
return true;
}
private static void addConstructorProperties(JCModifiers mods, JavacNode node, boolean msgParam, boolean causeParam) {
if (!msgParam && !causeParam) return;
JavacTreeMaker maker = node.getTreeMaker();
JCExpression constructorPropertiesType = chainDots(node, "java", "beans", "ConstructorProperties");
ListBuffer<JCExpression> fieldNames = new ListBuffer<JCExpression>();
if (msgParam) fieldNames.append(maker.Literal("message"));
if (causeParam) fieldNames.append(maker.Literal("cause"));
JCExpression fieldNamesArray = maker.NewArray(null, List.<JCExpression>nil(), fieldNames.toList());
JCAnnotation annotation = maker.Annotation(constructorPropertiesType, List.of(fieldNamesArray));
mods.annotations = mods.annotations.append(annotation);
}
@SuppressWarnings("deprecation") private static JCMethodDecl createConstructor(AccessLevel level, JavacNode typeNode, boolean msgParam, boolean causeParam, JavacNode source, List<JCStatement> statements) {
JavacTreeMaker maker = typeNode.getTreeMaker();
boolean addConstructorProperties;
if ((!msgParam && !causeParam) || isLocalType(typeNode) || !LombokOptionsFactory.getDelombokOptions(typeNode.getContext()).getFormatPreferences().generateConstructorProperties()) {
addConstructorProperties = false;
} else {
Boolean v = typeNode.getAst().readConfiguration(ConfigurationKeys.ANY_CONSTRUCTOR_ADD_CONSTRUCTOR_PROPERTIES);
addConstructorProperties = v != null ? v.booleanValue() :
Boolean.FALSE.equals(typeNode.getAst().readConfiguration(ConfigurationKeys.ANY_CONSTRUCTOR_SUPPRESS_CONSTRUCTOR_PROPERTIES));
}
ListBuffer<JCVariableDecl> params = new ListBuffer<JCVariableDecl>();
if (msgParam) {
Name fieldName = typeNode.toName("message");
long flags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, typeNode.getContext());
JCExpression pType = genJavaLangTypeRef(typeNode, "String");
JCVariableDecl param = maker.VarDef(maker.Modifiers(flags), fieldName, pType, null);
params.append(param);
}
if (causeParam) {
Name fieldName = typeNode.toName("cause");
long flags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, typeNode.getContext());
JCExpression pType = genJavaLangTypeRef(typeNode, "Throwable");
JCVariableDecl param = maker.VarDef(maker.Modifiers(flags), fieldName, pType, null);
params.append(param);
}
JCModifiers mods = maker.Modifiers(toJavacModifier(level), List.<JCAnnotation>nil());
if (addConstructorProperties) addConstructorProperties(mods, typeNode, msgParam, causeParam);
return recursiveSetGeneratedBy(maker.MethodDef(mods, typeNode.toName("<init>"),
null, List.<JCTypeParameter>nil(), params.toList(), List.<JCExpression>nil(),
maker.Block(0L, statements), null), source);
}
public static boolean isLocalType(JavacNode type) {
Kind kind = type.up().getKind();
if (kind == Kind.COMPILATION_UNIT) return false;
if (kind == Kind.TYPE) return isLocalType(type.up());
return true;
}
}
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