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/*
* Copyright © 2009-2011 Reinier Zwitserloot, Roel Spilker and Robbert Jan Grootjans.
*
* 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.javac.Javac.annotationTypeMatches;
import java.lang.annotation.Annotation;
import java.util.regex.Pattern;
import lombok.AccessLevel;
import lombok.Data;
import lombok.Getter;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.core.handlers.TransformationsUtil;
import lombok.javac.Javac;
import lombok.javac.JavacNode;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.code.TypeTags;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCLiteral;
import com.sun.tools.javac.tree.JCTree.JCModifiers;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCAssign;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCImport;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
import com.sun.tools.javac.tree.JCTree.JCNewArray;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.ListBuffer;
import com.sun.tools.javac.util.Name;
/**
* Container for static utility methods useful to handlers written for javac.
*/
public class JavacHandlerUtil {
private JavacHandlerUtil() {
//Prevent instantiation
}
/**
* Checks if the given expression (that really ought to refer to a type expression) represents a primitive type.
*/
public static boolean isPrimitive(JCExpression ref) {
String typeName = ref.toString();
return TransformationsUtil.PRIMITIVE_TYPE_NAME_PATTERN.matcher(typeName).matches();
}
/**
* Removes the annotation from javac's AST (it remains in lombok's AST),
* then removes any import statement that imports this exact annotation (not star imports).
* Only does this if the DeleteLombokAnnotations class is in the context.
*/
public static void deleteAnnotationIfNeccessary(JavacNode annotation, Class<? extends Annotation> annotationType) {
if (!annotation.shouldDeleteLombokAnnotations()) return;
JavacNode parentNode = annotation.directUp();
switch (parentNode.getKind()) {
case FIELD:
case ARGUMENT:
case LOCAL:
JCVariableDecl variable = (JCVariableDecl) parentNode.get();
variable.mods.annotations = filterList(variable.mods.annotations, annotation.get());
break;
case METHOD:
JCMethodDecl method = (JCMethodDecl) parentNode.get();
method.mods.annotations = filterList(method.mods.annotations, annotation.get());
break;
case TYPE:
try {
JCClassDecl type = (JCClassDecl) parentNode.get();
type.mods.annotations = filterList(type.mods.annotations, annotation.get());
} catch (ClassCastException e) {
//something rather odd has been annotated. Better to just break only delombok instead of everything.
}
break;
default:
//This really shouldn't happen, but if it does, better just break delombok instead of breaking everything.
return;
}
deleteImportFromCompilationUnit(annotation, annotationType.getName());
}
public static void deleteImportFromCompilationUnit(JavacNode node, String name) {
if (!node.shouldDeleteLombokAnnotations()) return;
ListBuffer<JCTree> newDefs = ListBuffer.lb();
JCCompilationUnit unit = (JCCompilationUnit) node.top().get();
for (JCTree def : unit.defs) {
boolean delete = false;
if (def instanceof JCImport) {
JCImport imp0rt = (JCImport)def;
delete = (!imp0rt.staticImport && imp0rt.qualid.toString().equals(name));
}
if (!delete) newDefs.append(def);
}
unit.defs = newDefs.toList();
}
private static List<JCAnnotation> filterList(List<JCAnnotation> annotations, JCTree jcTree) {
ListBuffer<JCAnnotation> newAnnotations = ListBuffer.lb();
for (JCAnnotation ann : annotations) {
if (jcTree != ann) newAnnotations.append(ann);
}
return newAnnotations.toList();
}
/**
* Translates the given field into all possible getter names.
* Convenient wrapper around {@link TransformationsUtil#toAllGetterNames(CharSequence, boolean)}.
*/
public static java.util.List<String> toAllGetterNames(JCVariableDecl field) {
CharSequence fieldName = field.name;
boolean isBoolean = field.vartype.toString().equals("boolean");
return TransformationsUtil.toAllGetterNames(fieldName, isBoolean);
}
/**
* @return the likely getter name for the stated field. (e.g. private boolean foo; to isFoo).
*
* Convenient wrapper around {@link TransformationsUtil#toGetterName(CharSequence, boolean)}.
*/
public static String toGetterName(JCVariableDecl field) {
CharSequence fieldName = field.name;
boolean isBoolean = field.vartype.toString().equals("boolean");
return TransformationsUtil.toGetterName(fieldName, isBoolean);
}
/**
* Translates the given field into all possible setter names.
* Convenient wrapper around {@link TransformationsUtil#toAllSetterNames(CharSequence, boolean)}.
*/
public static java.util.List<String> toAllSetterNames(JCVariableDecl field) {
CharSequence fieldName = field.name;
boolean isBoolean = field.vartype.toString().equals("boolean");
return TransformationsUtil.toAllSetterNames(fieldName, isBoolean);
}
/**
* @return the likely setter name for the stated field. (e.g. private boolean foo; to setFoo).
*
* Convenient wrapper around {@link TransformationsUtil#toSetterName(CharSequence, boolean)}.
*/
public static String toSetterName(JCVariableDecl field) {
CharSequence fieldName = field.name;
boolean isBoolean = field.vartype.toString().equals("boolean");
return TransformationsUtil.toSetterName(fieldName, isBoolean);
}
/** Serves as return value for the methods that check for the existence of fields and methods. */
public enum MemberExistsResult {
NOT_EXISTS, EXISTS_BY_LOMBOK, EXISTS_BY_USER;
}
/**
* Checks if there is a field with the provided name.
*
* @param fieldName the field name to check for.
* @param node Any node that represents the Type (JCClassDecl) to look in, or any child node thereof.
*/
public static MemberExistsResult fieldExists(String fieldName, JavacNode node) {
while (node != null && !(node.get() instanceof JCClassDecl)) {
node = node.up();
}
if (node != null && node.get() instanceof JCClassDecl) {
for (JCTree def : ((JCClassDecl)node.get()).defs) {
if (def instanceof JCVariableDecl) {
if (((JCVariableDecl)def).name.contentEquals(fieldName)) {
return Javac.getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK;
}
}
}
}
return MemberExistsResult.NOT_EXISTS;
}
public static MemberExistsResult methodExists(String methodName, JavacNode node) {
return methodExists(methodName, node, true);
}
/**
* Checks if there is a method with the provided name. In case of multiple methods (overloading), only
* the first method decides if EXISTS_BY_USER or EXISTS_BY_LOMBOK is returned.
*
* @param methodName the method name to check for.
* @param node Any node that represents the Type (JCClassDecl) to look in, or any child node thereof.
* @param caseSensitive If the search should be case sensitive.
*/
public static MemberExistsResult methodExists(String methodName, JavacNode node, boolean caseSensitive) {
while (node != null && !(node.get() instanceof JCClassDecl)) {
node = node.up();
}
if (node != null && node.get() instanceof JCClassDecl) {
for (JCTree def : ((JCClassDecl)node.get()).defs) {
if (def instanceof JCMethodDecl) {
String name = ((JCMethodDecl)def).name.toString();
boolean matches = caseSensitive ? name.equals(methodName) : name.equalsIgnoreCase(methodName);
if (matches) return Javac.getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK;
}
}
}
return MemberExistsResult.NOT_EXISTS;
}
/**
* Checks if there is a (non-default) constructor. In case of multiple constructors (overloading), only
* the first constructor decides if EXISTS_BY_USER or EXISTS_BY_LOMBOK is returned.
*
* @param node Any node that represents the Type (JCClassDecl) to look in, or any child node thereof.
*/
public static MemberExistsResult constructorExists(JavacNode node) {
while (node != null && !(node.get() instanceof JCClassDecl)) {
node = node.up();
}
if (node != null && node.get() instanceof JCClassDecl) {
for (JCTree def : ((JCClassDecl)node.get()).defs) {
if (def instanceof JCMethodDecl) {
if (((JCMethodDecl)def).name.contentEquals("<init>")) {
if ((((JCMethodDecl)def).mods.flags & Flags.GENERATEDCONSTR) != 0) continue;
return Javac.getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK;
}
}
}
}
return MemberExistsResult.NOT_EXISTS;
}
/**
* Turns an {@code AccessLevel} instance into the flag bit used by javac.
*/
public static int toJavacModifier(AccessLevel accessLevel) {
switch (accessLevel) {
case MODULE:
case PACKAGE:
return 0;
default:
case PUBLIC:
return Flags.PUBLIC;
case NONE:
case PRIVATE:
return Flags.PRIVATE;
case PROTECTED:
return Flags.PROTECTED;
}
}
private static class GetterMethod {
private final Name name;
private final JCExpression type;
GetterMethod(Name name, JCExpression type) {
this.name = name;
this.type = type;
}
}
private static GetterMethod findGetter(JavacNode field) {
JCVariableDecl decl = (JCVariableDecl)field.get();
JavacNode typeNode = field.up();
for (String potentialGetterName : toAllGetterNames(decl)) {
for (JavacNode potentialGetter : typeNode.down()) {
if (potentialGetter.getKind() != Kind.METHOD) continue;
JCMethodDecl method = (JCMethodDecl) potentialGetter.get();
if (!method.name.toString().equalsIgnoreCase(potentialGetterName)) continue;
/** static getX() methods don't count. */
if ((method.mods.flags & Flags.STATIC) != 0) continue;
/** Nor do getters with a non-empty parameter list. */
if (method.params != null && method.params.size() > 0) continue;
return new GetterMethod(method.name, method.restype);
}
}
// Check if the field has a @Getter annotation.
boolean hasGetterAnnotation = false;
for (JavacNode child : field.down()) {
if (child.getKind() == Kind.ANNOTATION && annotationTypeMatches(Getter.class, child)) {
AnnotationValues<Getter> ann = Javac.createAnnotation(Getter.class, child);
if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter.
hasGetterAnnotation = true;
}
}
// Check if the class has a @Getter annotation.
if (!hasGetterAnnotation && new HandleGetter().fieldQualifiesForGetterGeneration(field)) {
//Check if the class has @Getter or @Data annotation.
JavacNode containingType = field.up();
if (containingType != null) for (JavacNode child : containingType.down()) {
if (child.getKind() == Kind.ANNOTATION && annotationTypeMatches(Data.class, child)) hasGetterAnnotation = true;
if (child.getKind() == Kind.ANNOTATION && annotationTypeMatches(Getter.class, child)) {
AnnotationValues<Getter> ann = Javac.createAnnotation(Getter.class, child);
if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter.
hasGetterAnnotation = true;
}
}
}
if (hasGetterAnnotation) {
String getterName = toGetterName(decl);
return new GetterMethod(field.toName(getterName), decl.vartype);
}
return null;
}
enum FieldAccess {
GETTER, PREFER_FIELD, ALWAYS_FIELD;
}
static boolean lookForGetter(JavacNode field, FieldAccess fieldAccess) {
if (fieldAccess == FieldAccess.GETTER) return true;
if (fieldAccess == FieldAccess.ALWAYS_FIELD) return false;
// If @Getter(lazy = true) is used, then using it is mandatory.
for (JavacNode child : field.down()) {
if (child.getKind() != Kind.ANNOTATION) continue;
if (Javac.annotationTypeMatches(Getter.class, child)) {
AnnotationValues<Getter> ann = Javac.createAnnotation(Getter.class, child);
if (ann.getInstance().lazy()) return true;
}
}
return false;
}
/**
* Returns the type of the field, unless a getter exists for this field, in which case the return type of the getter is returned.
*
* @see #createFieldAccessor(TreeMaker, JavacNode)
*/
static JCExpression getFieldType(JavacNode field, FieldAccess fieldAccess) {
boolean lookForGetter = lookForGetter(field, fieldAccess);
GetterMethod getter = lookForGetter ? findGetter(field) : null;
if (getter == null) {
return ((JCVariableDecl)field.get()).vartype;
}
return getter.type;
}
/**
* Creates an expression that reads the field. Will either be {@code this.field} or {@code this.getField()} depending on whether or not there's a getter.
*/
static JCExpression createFieldAccessor(TreeMaker maker, JavacNode field, FieldAccess fieldAccess) {
return createFieldAccessor(maker, field, fieldAccess, null);
}
static JCExpression createFieldAccessor(TreeMaker maker, JavacNode field, FieldAccess fieldAccess, JCExpression receiver) {
boolean lookForGetter = lookForGetter(field, fieldAccess);
GetterMethod getter = lookForGetter ? findGetter(field) : null;
JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
if (getter == null) {
if (receiver == null) {
if ((fieldDecl.mods.flags & Flags.STATIC) == 0) {
receiver = maker.Ident(field.toName("this"));
} else {
JavacNode containerNode = field.up();
if (containerNode != null && containerNode.get() instanceof JCClassDecl) {
JCClassDecl container = (JCClassDecl) field.up().get();
receiver = maker.Ident(container.name);
}
}
}
return receiver == null ? maker.Ident(fieldDecl.name) : maker.Select(receiver, fieldDecl.name);
}
if (receiver == null) receiver = maker.Ident(field.toName("this"));
JCMethodInvocation call = maker.Apply(List.<JCExpression>nil(),
maker.Select(receiver, getter.name), List.<JCExpression>nil());
return call;
}
/**
* Adds the given new field declaration to the provided type AST Node.
* The field carries the @{@link SuppressWarnings}("all") annotation.
* Also takes care of updating the JavacAST.
*/
public static void injectFieldSuppressWarnings(JavacNode typeNode, JCVariableDecl field) {
injectField(typeNode, field, true);
}
/**
* Adds the given new field declaration to the provided type AST Node.
*
* Also takes care of updating the JavacAST.
*/
public static void injectField(JavacNode typeNode, JCVariableDecl field) {
injectField(typeNode, field, false);
}
private static void injectField(JavacNode typeNode, JCVariableDecl field, boolean addSuppressWarnings) {
JCClassDecl type = (JCClassDecl) typeNode.get();
if (addSuppressWarnings) addSuppressWarningsAll(field.mods, typeNode, field.pos, Javac.getGeneratedBy(field));
type.defs = type.defs.append(field);
typeNode.add(field, Kind.FIELD);
}
/**
* Adds the given new method declaration to the provided type AST Node.
* Can also inject constructors.
*
* Also takes care of updating the JavacAST.
*/
public static void injectMethod(JavacNode typeNode, JCMethodDecl method) {
JCClassDecl type = (JCClassDecl) typeNode.get();
if (method.getName().contentEquals("<init>")) {
//Scan for default constructor, and remove it.
int idx = 0;
for (JCTree def : type.defs) {
if (def instanceof JCMethodDecl) {
if ((((JCMethodDecl)def).mods.flags & Flags.GENERATEDCONSTR) != 0) {
JavacNode tossMe = typeNode.getNodeFor(def);
if (tossMe != null) tossMe.up().removeChild(tossMe);
type.defs = addAllButOne(type.defs, idx);
break;
}
}
idx++;
}
}
addSuppressWarningsAll(method.mods, typeNode, method.pos, Javac.getGeneratedBy(method));
type.defs = type.defs.append(method);
typeNode.add(method, Kind.METHOD);
}
private static void addSuppressWarningsAll(JCModifiers mods, JavacNode node, int pos, JCTree source) {
TreeMaker maker = node.getTreeMaker();
JCExpression suppressWarningsType = chainDots(maker, node, "java", "lang", "SuppressWarnings");
JCLiteral allLiteral = maker.Literal("all");
suppressWarningsType.pos = pos;
allLiteral.pos = pos;
JCAnnotation annotation = Javac.recursiveSetGeneratedBy(maker.Annotation(suppressWarningsType, List.<JCExpression>of(allLiteral)), source);
annotation.pos = pos;
mods.annotations = mods.annotations.append(annotation);
}
private static List<JCTree> addAllButOne(List<JCTree> defs, int idx) {
ListBuffer<JCTree> out = ListBuffer.lb();
int i = 0;
for (JCTree def : defs) {
if (i++ != idx) out.append(def);
}
return out.toList();
}
/**
* In javac, dotted access of any kind, from {@code java.lang.String} to {@code var.methodName}
* is represented by a fold-left of {@code Select} nodes with the leftmost string represented by
* a {@code Ident} node. This method generates such an expression.
*
* For example, maker.Select(maker.Select(maker.Ident(NAME[java]), NAME[lang]), NAME[String]).
*
* @see com.sun.tools.javac.tree.JCTree.JCIdent
* @see com.sun.tools.javac.tree.JCTree.JCFieldAccess
*/
public static JCExpression chainDots(TreeMaker maker, JavacNode node, String... elems) {
assert elems != null;
assert elems.length > 0;
JCExpression e = maker.Ident(node.toName(elems[0]));
for (int i = 1 ; i < elems.length ; i++) {
e = maker.Select(e, node.toName(elems[i]));
}
return e;
}
/**
* In javac, dotted access of any kind, from {@code java.lang.String} to {@code var.methodName}
* is represented by a fold-left of {@code Select} nodes with the leftmost string represented by
* a {@code Ident} node. This method generates such an expression.
*
* For example, maker.Select(maker.Select(maker.Ident(NAME[java]), NAME[lang]), NAME[String]).
*
* @see com.sun.tools.javac.tree.JCTree.JCIdent
* @see com.sun.tools.javac.tree.JCTree.JCFieldAccess
*/
public static JCExpression chainDotsString(TreeMaker maker, JavacNode node, String elems) {
return chainDots(maker, node, elems.split("\\."));
}
/**
* Searches the given field node for annotations and returns each one that matches the provided regular expression pattern.
*
* Only the simple name is checked - the package and any containing class are ignored.
*/
public static List<JCAnnotation> findAnnotations(JavacNode fieldNode, Pattern namePattern) {
ListBuffer<JCAnnotation> result = ListBuffer.lb();
for (JavacNode child : fieldNode.down()) {
if (child.getKind() == Kind.ANNOTATION) {
JCAnnotation annotation = (JCAnnotation) child.get();
String name = annotation.annotationType.toString();
int idx = name.lastIndexOf(".");
String suspect = idx == -1 ? name : name.substring(idx + 1);
if (namePattern.matcher(suspect).matches()) {
result.append(annotation);
}
}
}
return result.toList();
}
/**
* Generates a new statement that checks if the given variable is null, and if so, throws a {@code NullPointerException} with the
* variable name as message.
*/
public static JCStatement generateNullCheck(TreeMaker treeMaker, JavacNode variable) {
JCVariableDecl varDecl = (JCVariableDecl) variable.get();
if (isPrimitive(varDecl.vartype)) return null;
Name fieldName = varDecl.name;
JCExpression npe = chainDots(treeMaker, variable, "java", "lang", "NullPointerException");
JCTree exception = treeMaker.NewClass(null, List.<JCExpression>nil(), npe, List.<JCExpression>of(treeMaker.Literal(fieldName.toString())), null);
JCStatement throwStatement = treeMaker.Throw(exception);
return treeMaker.If(treeMaker.Binary(Javac.getCTCint(JCTree.class, "EQ"), treeMaker.Ident(fieldName), treeMaker.Literal(Javac.getCTCint(TypeTags.class, "BOT"), null)), throwStatement, null);
}
/**
* Given a list of field names and a node referring to a type, finds each name in the list that does not match a field within the type.
*/
public static List<Integer> createListOfNonExistentFields(List<String> list, JavacNode type, boolean excludeStandard, boolean excludeTransient) {
boolean[] matched = new boolean[list.size()];
for (JavacNode child : type.down()) {
if (list.isEmpty()) break;
if (child.getKind() != Kind.FIELD) continue;
JCVariableDecl field = (JCVariableDecl)child.get();
if (excludeStandard) {
if ((field.mods.flags & Flags.STATIC) != 0) continue;
if (field.name.toString().startsWith("$")) continue;
}
if (excludeTransient && (field.mods.flags & Flags.TRANSIENT) != 0) continue;
int idx = list.indexOf(child.getName());
if (idx > -1) matched[idx] = true;
}
ListBuffer<Integer> problematic = ListBuffer.lb();
for (int i = 0 ; i < list.size() ; i++) {
if (!matched[i]) problematic.append(i);
}
return problematic.toList();
}
static List<JCExpression> getAndRemoveAnnotationParameter(JCAnnotation ast, String parameterName) {
ListBuffer<JCExpression> params = ListBuffer.lb();
List<JCExpression> result = List.nil();
for (JCExpression param : ast.args) {
if (param instanceof JCAssign) {
JCAssign assign = (JCAssign) param;
if (assign.lhs instanceof JCIdent) {
JCIdent ident = (JCIdent) assign.lhs;
if (parameterName.equals(ident.name.toString())) {
if (assign.rhs instanceof JCNewArray) {
result = ((JCNewArray) assign.rhs).elems;
} else {
result = result.append(assign.rhs);
}
continue;
}
}
}
params.append(param);
}
ast.args = params.toList();
return result;
}
static List<JCAnnotation> copyAnnotations(List<JCExpression> in) {
ListBuffer<JCAnnotation> out = ListBuffer.lb();
for (JCExpression expr : in) {
if (!(expr instanceof JCAnnotation)) continue;
out.append((JCAnnotation) expr.clone());
}
return out.toList();
}
}
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