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/*
* Copyright (C) 2010-2019 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.code.Type;
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.CTC_VOID;
import static lombok.javac.handlers.JavacHandlerUtil.*;
@Provides
public class HandleStandardException extends JavacAnnotationHandler<StandardException> {
private static final String NAME = StandardException.class.getSimpleName();
@Override
public void handle(AnnotationValues<StandardException> annotation, JCAnnotation ast, JavacNode annotationNode) {
handleFlagUsage(annotationNode, ConfigurationKeys.STANDARD_EXCEPTION_FLAG_USAGE, "@StandardException");
deleteAnnotationIfNeccessary(annotationNode, StandardException.class);
JavacNode typeNode = annotationNode.up();
if (!checkLegality(typeNode, annotationNode)) return;
SuperParameter messageField = new SuperParameter("message", typeNode.getSymbolTable().stringType);
SuperParameter causeField = new SuperParameter("cause", typeNode.getSymbolTable().throwableType);
boolean skip = true;
generateConstructor(typeNode, AccessLevel.PUBLIC, List.<SuperParameter>nil(), skip, annotationNode);
generateConstructor(typeNode, AccessLevel.PUBLIC, List.of(messageField), skip, annotationNode);
generateConstructor(typeNode, AccessLevel.PUBLIC, List.of(causeField), skip, annotationNode);
generateConstructor(typeNode, AccessLevel.PUBLIC, List.of(messageField, causeField), skip, annotationNode);
}
private static boolean checkLegality(JavacNode typeNode, JavacNode errorNode) {
JCClassDecl typeDecl = null;
if (typeNode.get() instanceof JCClassDecl) typeDecl = (JCClassDecl) typeNode.get();
long modifiers = typeDecl == null ? 0 : typeDecl.mods.flags;
boolean notAClass = (modifiers & (Flags.INTERFACE | Flags.ANNOTATION)) != 0;
if (typeDecl == null || notAClass) {
errorNode.addError(NAME + " is only supported on a class or an enum.");
return false;
}
return true;
}
public void generateConstructor(JavacNode typeNode, AccessLevel level, List<SuperParameter> fields,
boolean skipIfConstructorExists, JavacNode source) {
generate(typeNode, level, fields, skipIfConstructorExists, source);
}
private void generate(JavacNode typeNode, AccessLevel level, List<SuperParameter> fields, boolean skipIfConstructorExists,
JavacNode source) {
ListBuffer<Type> argTypes = new ListBuffer<Type>();
for (SuperParameter field : fields) {
Type mirror = field.type;
if (mirror == null) {
argTypes = null;
break;
}
argTypes.append(mirror);
}
List<Type> argTypes_ = argTypes == null ? null : argTypes.toList();
if (!(skipIfConstructorExists && constructorExists(typeNode, fields) != MemberExistsResult.NOT_EXISTS)) {
JCMethodDecl constr = createConstructor(level, typeNode, fields, source);
injectMethod(typeNode, constr, argTypes_, Javac.createVoidType(typeNode.getSymbolTable(), CTC_VOID));
}
}
public static MemberExistsResult constructorExists(JavacNode node, List<SuperParameter> parameters) {
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(md.params, parameters)) continue;
return getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK;
}
}
}
}
return MemberExistsResult.NOT_EXISTS;
}
private static boolean paramsMatch(List<JCVariableDecl> params, List<SuperParameter> superParams) {
if (params == null) {
return superParams.size() == 0;
} else if (params.size() != superParams.size()) {
return false;
} else {
for (int i = 0; i < superParams.size(); i++) {
SuperParameter field = superParams.get(i);
JCVariableDecl param = params.get(i);
if (!param.getType().type.equals(field.type))
return false;
}
}
return true;
}
public static void addConstructorProperties(JCModifiers mods, JavacNode node, List<SuperParameter> fields) {
if (fields.isEmpty()) return;
JavacTreeMaker maker = node.getTreeMaker();
JCExpression constructorPropertiesType = chainDots(node, "java", "beans", "ConstructorProperties");
ListBuffer<JCExpression> fieldNames = new ListBuffer<JCExpression>();
for (SuperParameter field : fields) {
Name fieldName = node.toName(field.name);
fieldNames.append(maker.Literal(fieldName.toString()));
}
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") public static JCMethodDecl createConstructor(AccessLevel level, JavacNode typeNode,
List<SuperParameter> fieldsToParam, JavacNode source) {
JavacTreeMaker maker = typeNode.getTreeMaker();
boolean isEnum = (((JCClassDecl) typeNode.get()).mods.flags & Flags.ENUM) != 0;
if (isEnum) level = AccessLevel.PRIVATE;
boolean addConstructorProperties;
if (fieldsToParam.isEmpty()) {
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>();
ListBuffer<JCExpression> superArgs = new ListBuffer<JCExpression>();
for (SuperParameter fieldNode : fieldsToParam) {
Name fieldName = source.toName(fieldNode.name);
long flags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, typeNode.getContext());
JCExpression pType = maker.getUnderlyingTreeMaker().Ident(fieldNode.type.tsym);
JCVariableDecl param = maker.VarDef(maker.Modifiers(flags), fieldName, pType, null);
params.append(param);
superArgs.append(maker.Ident(fieldName));
}
ListBuffer<JCStatement> statements = new ListBuffer<JCStatement>();
JCMethodInvocation callToSuper = maker.Apply(List.<JCExpression>nil(),
maker.Ident(typeNode.toName("super")),
superArgs.toList());
statements.add(maker.Exec(callToSuper));
JCModifiers mods = maker.Modifiers(toJavacModifier(level), List.<JCAnnotation>nil());
if (addConstructorProperties && !isLocalType(typeNode) && LombokOptionsFactory.getDelombokOptions(typeNode.getContext()).getFormatPreferences().generateConstructorProperties()) {
addConstructorProperties(mods, typeNode, fieldsToParam);
}
return recursiveSetGeneratedBy(maker.MethodDef(mods, typeNode.toName("<init>"),
null, List.<JCTypeParameter>nil(), params.toList(), List.<JCExpression>nil(),
maker.Block(0L, statements.toList()), 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;
}
private static class SuperParameter {
private final String name;
private final Type type;
private SuperParameter(String name, Type type) {
this.name = name;
this.type = type;
}
}
}
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