/* * Copyright (C) 2009-2013 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.javac.Javac.*; import java.lang.annotation.Annotation; import java.lang.ref.WeakReference; import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; import java.util.WeakHashMap; import java.util.regex.Pattern; import lombok.AccessLevel; import lombok.Data; import lombok.Getter; import lombok.core.AST.Kind; import lombok.core.AnnotationValues; import lombok.core.AnnotationValues.AnnotationValue; import lombok.core.TransformationsUtil; import lombok.core.TypeResolver; import lombok.experimental.Accessors; import lombok.javac.JavacNode; import com.sun.tools.javac.code.BoundKind; 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.JCArrayTypeTree; import com.sun.tools.javac.tree.JCTree.JCAssign; import com.sun.tools.javac.tree.JCTree.JCBlock; 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.JCExpressionStatement; import com.sun.tools.javac.tree.JCTree.JCFieldAccess; import com.sun.tools.javac.tree.JCTree.JCIdent; import com.sun.tools.javac.tree.JCTree.JCImport; import com.sun.tools.javac.tree.JCTree.JCLiteral; import com.sun.tools.javac.tree.JCTree.JCMethodDecl; import com.sun.tools.javac.tree.JCTree.JCMethodInvocation; import com.sun.tools.javac.tree.JCTree.JCModifiers; import com.sun.tools.javac.tree.JCTree.JCNewArray; import com.sun.tools.javac.tree.JCTree.JCPrimitiveTypeTree; import com.sun.tools.javac.tree.JCTree.JCStatement; import com.sun.tools.javac.tree.JCTree.JCTypeApply; import com.sun.tools.javac.tree.JCTree.JCTypeParameter; import com.sun.tools.javac.tree.JCTree.JCVariableDecl; import com.sun.tools.javac.tree.JCTree.JCWildcard; import com.sun.tools.javac.tree.JCTree.TypeBoundKind; import com.sun.tools.javac.tree.TreeMaker; import com.sun.tools.javac.tree.TreeScanner; import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; import com.sun.tools.javac.util.List; import com.sun.tools.javac.util.ListBuffer; import com.sun.tools.javac.util.Name; import com.sun.tools.javac.util.Options; /** * Container for static utility methods useful to handlers written for javac. */ public class JavacHandlerUtil { private JavacHandlerUtil() { //Prevent instantiation } private static class MarkingScanner extends TreeScanner { private final JCTree source; MarkingScanner(JCTree source) { this.source = source; } @Override public void scan(JCTree tree) { setGeneratedBy(tree, source); super.scan(tree); } } private static Map> generatedNodes = new WeakHashMap>(); /** * Contributed by Jan Lahoda; many lombok transformations should not be run (or a lite version should be run) when the netbeans editor * is running javac on the open source file to find inline errors and such. As class files are compiled separately this does not affect * actual runtime behaviour or file output of the netbeans IDE. */ public static boolean inNetbeansEditor(JavacNode node) { Options options = Options.instance(node.getContext()); return (options.keySet().contains("ide") && !options.keySet().contains("backgroundCompilation")); } public static JCTree getGeneratedBy(JCTree node) { synchronized (generatedNodes) { WeakReference ref = generatedNodes.get(node); return ref == null ? null : ref.get(); } } public static boolean isGenerated(JCTree node) { return getGeneratedBy(node) != null; } public static T recursiveSetGeneratedBy(T node, JCTree source) { if (node == null) return null; setGeneratedBy(node, source); node.accept(new MarkingScanner(source)); return node; } public static T setGeneratedBy(T node, JCTree source) { synchronized (generatedNodes) { if (source == null) generatedNodes.remove(node); else generatedNodes.put(node, new WeakReference(source)); } return node; } public static boolean hasAnnotation(Class type, JavacNode node) { return hasAnnotation(type, node, false); } public static boolean hasAnnotationAndDeleteIfNeccessary(Class type, JavacNode node) { return hasAnnotation(type, node, true); } private static boolean hasAnnotation(Class type, JavacNode node, boolean delete) { if (node == null) return false; if (type == null) return false; switch (node.getKind()) { case ARGUMENT: case FIELD: case LOCAL: case TYPE: case METHOD: for (JavacNode child : node.down()) { if (annotationTypeMatches(type, child)) { if (delete) deleteAnnotationIfNeccessary(child, type); return true; } } // intentional fallthrough default: return false; } } /** * Checks if the Annotation AST Node provided is likely to be an instance of the provided annotation type. * * @param type An actual annotation type, such as {@code lombok.Getter.class}. * @param node A Lombok AST node representing an annotation in source code. */ public static boolean annotationTypeMatches(Class type, JavacNode node) { if (node.getKind() != Kind.ANNOTATION) return false; return typeMatches(type, node, ((JCAnnotation)node.get()).annotationType); } /** * Checks if the given TypeReference node is likely to be a reference to the provided class. * * @param type An actual type. This method checks if {@code typeNode} is likely to be a reference to this type. * @param node A Lombok AST node. Any node in the appropriate compilation unit will do (used to get access to import statements). * @param typeNode A type reference to check. */ public static boolean typeMatches(Class type, JavacNode node, JCTree typeNode) { String typeName = typeNode.toString(); TypeResolver resolver = new TypeResolver(node.getImportList()); return resolver.typeMatches(node, type.getName(), typeName); } /** * Returns if a field is marked deprecated, either by {@code @Deprecated} or in javadoc * @param field the field to check * @return {@code true} if a field is marked deprecated, either by {@code @Deprecated} or in javadoc, otherwise {@code false} */ public static boolean isFieldDeprecated(JavacNode field) { JCVariableDecl fieldNode = (JCVariableDecl) field.get(); if ((fieldNode.mods.flags & Flags.DEPRECATED) != 0) { return true; } for (JavacNode child : field.down()) { if (annotationTypeMatches(Deprecated.class, child)) { return true; } } return false; } /** * Creates an instance of {@code AnnotationValues} for the provided AST Node. * * @param type An annotation class type, such as {@code lombok.Getter.class}. * @param node A Lombok AST node representing an annotation in source code. */ public static AnnotationValues createAnnotation(Class type, final JavacNode node) { Map values = new HashMap(); JCAnnotation anno = (JCAnnotation) node.get(); List arguments = anno.getArguments(); for (Method m : type.getDeclaredMethods()) { if (!Modifier.isPublic(m.getModifiers())) continue; String name = m.getName(); java.util.List raws = new ArrayList(); java.util.List guesses = new ArrayList(); java.util.List expressions = new ArrayList(); final java.util.List positions = new ArrayList(); boolean isExplicit = false; for (JCExpression arg : arguments) { String mName; JCExpression rhs; if (arg instanceof JCAssign) { JCAssign assign = (JCAssign) arg; mName = assign.lhs.toString(); rhs = assign.rhs; } else { rhs = arg; mName = "value"; } if (!mName.equals(name)) continue; isExplicit = true; if (rhs instanceof JCNewArray) { List elems = ((JCNewArray)rhs).elems; for (JCExpression inner : elems) { raws.add(inner.toString()); expressions.add(inner); guesses.add(calculateGuess(inner)); positions.add(inner.pos()); } } else { raws.add(rhs.toString()); expressions.add(rhs); guesses.add(calculateGuess(rhs)); positions.add(rhs.pos()); } } values.put(name, new AnnotationValue(node, raws, expressions, guesses, isExplicit) { @Override public void setError(String message, int valueIdx) { if (valueIdx < 0) node.addError(message); else node.addError(message, positions.get(valueIdx)); } @Override public void setWarning(String message, int valueIdx) { if (valueIdx < 0) node.addWarning(message); else node.addWarning(message, positions.get(valueIdx)); } }); } return new AnnotationValues(type, values, node); } /** * 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 annotationType) { if (inNetbeansEditor(annotation)) return; 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; } parentNode.getAst().setChanged(); deleteImportFromCompilationUnit(annotation, annotationType.getName()); } public static void deleteImportFromCompilationUnit(JavacNode node, String name) { if (inNetbeansEditor(node)) return; if (!node.shouldDeleteLombokAnnotations()) return; ListBuffer 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 filterList(List annotations, JCTree jcTree) { ListBuffer newAnnotations = ListBuffer.lb(); for (JCAnnotation ann : annotations) { if (jcTree != ann) newAnnotations.append(ann); } return newAnnotations.toList(); } /** 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; } /** * Translates the given field into all possible getter names. * Convenient wrapper around {@link TransformationsUtil#toAllGetterNames(lombok.core.AnnotationValues, CharSequence, boolean)}. */ public static java.util.List toAllGetterNames(JavacNode field) { return TransformationsUtil.toAllGetterNames(getAccessorsForField(field), field.getName(), isBoolean(field)); } /** * @return the likely getter name for the stated field. (e.g. private boolean foo; to isFoo). * * Convenient wrapper around {@link TransformationsUtil#toGetterName(lombok.core.AnnotationValues, CharSequence, boolean)}. */ public static String toGetterName(JavacNode field) { return TransformationsUtil.toGetterName(getAccessorsForField(field), field.getName(), isBoolean(field)); } /** * Translates the given field into all possible setter names. * Convenient wrapper around {@link TransformationsUtil#toAllSetterNames(lombok.core.AnnotationValues, CharSequence, boolean)}. */ public static java.util.List toAllSetterNames(JavacNode field) { return TransformationsUtil.toAllSetterNames(getAccessorsForField(field), field.getName(), isBoolean(field)); } /** * @return the likely setter name for the stated field. (e.g. private boolean foo; to setFoo). * * Convenient wrapper around {@link TransformationsUtil#toSetterName(lombok.core.AnnotationValues, CharSequence, boolean)}. */ public static String toSetterName(JavacNode field) { return TransformationsUtil.toSetterName(getAccessorsForField(field), field.getName(), isBoolean(field)); } /** * Translates the given field into all possible wither names. * Convenient wrapper around {@link TransformationsUtil#toAllWitherNames(lombok.core.AnnotationValues, CharSequence, boolean)}. */ public static java.util.List toAllWitherNames(JavacNode field) { return TransformationsUtil.toAllWitherNames(getAccessorsForField(field), field.getName(), isBoolean(field)); } /** * @return the likely wither name for the stated field. (e.g. private boolean foo; to withFoo). * * Convenient wrapper around {@link TransformationsUtil#toWitherName(lombok.core.AnnotationValues, CharSequence, boolean)}. */ public static String toWitherName(JavacNode field) { return TransformationsUtil.toWitherName(getAccessorsForField(field), field.getName(), isBoolean(field)); } /** * When generating a setter, the setter either returns void (beanspec) or Self (fluent). * This method scans for the {@code Accessors} annotation to figure that out. */ public static boolean shouldReturnThis(JavacNode field) { if ((((JCVariableDecl) field.get()).mods.flags & Flags.STATIC) != 0) return false; AnnotationValues accessors = JavacHandlerUtil.getAccessorsForField(field); boolean forced = (accessors.getActualExpression("chain") != null); Accessors instance = accessors.getInstance(); return instance.chain() || (instance.fluent() && !forced); } public static JCExpression cloneSelfType(JavacNode field) { JavacNode typeNode = field; TreeMaker maker = field.getTreeMaker(); while (typeNode != null && typeNode.getKind() != Kind.TYPE) typeNode = typeNode.up(); if (typeNode != null && typeNode.get() instanceof JCClassDecl) { JCClassDecl type = (JCClassDecl) typeNode.get(); ListBuffer typeArgs = ListBuffer.lb(); if (!type.typarams.isEmpty()) { for (JCTypeParameter tp : type.typarams) { typeArgs.append(maker.Ident(tp.name)); } return maker.TypeApply(maker.Ident(type.name), typeArgs.toList()); } else { return maker.Ident(type.name); } } else { return null; } } private static boolean isBoolean(JavacNode field) { JCExpression varType = ((JCVariableDecl) field.get()).vartype; return varType != null && varType.toString().equals("boolean"); } public static AnnotationValues getAccessorsForField(JavacNode field) { for (JavacNode node : field.down()) { if (annotationTypeMatches(Accessors.class, node)) { return createAnnotation(Accessors.class, node); } } JavacNode current = field.up(); while (current != null) { for (JavacNode node : current.down()) { if (annotationTypeMatches(Accessors.class, node)) { return createAnnotation(Accessors.class, node); } } current = current.up(); } return AnnotationValues.of(Accessors.class, field); } /** * 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) { node = upToTypeNode(node); 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 getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK; } } } } return MemberExistsResult.NOT_EXISTS; } public static MemberExistsResult methodExists(String methodName, JavacNode node, int params) { return methodExists(methodName, node, true, params); } /** * 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. * @param params The number of parameters the method should have; varargs count as 0-*. Set to -1 to find any method with the appropriate name regardless of parameter count. */ public static MemberExistsResult methodExists(String methodName, JavacNode node, boolean caseSensitive, int params) { 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; String name = md.name.toString(); boolean matches = caseSensitive ? name.equals(methodName) : name.equalsIgnoreCase(methodName); if (matches) { if (params > -1) { List ps = md.params; int minArgs = 0; int maxArgs = 0; if (ps != null && ps.length() > 0) { minArgs = ps.length(); if ((ps.last().mods.flags & Flags.VARARGS) != 0) { maxArgs = Integer.MAX_VALUE; minArgs--; } else { maxArgs = minArgs; } } if (params < minArgs || params > maxArgs) continue; } return 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) { node = upToTypeNode(node); if (node != null && node.get() instanceof JCClassDecl) { for (JCTree def : ((JCClassDecl)node.get()).defs) { if (def instanceof JCMethodDecl) { if (((JCMethodDecl)def).name.contentEquals("")) { if ((((JCMethodDecl)def).mods.flags & Flags.GENERATEDCONSTR) != 0) continue; return getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK; } } } } return MemberExistsResult.NOT_EXISTS; } public static boolean isConstructorCall(final JCStatement statement) { if (!(statement instanceof JCExpressionStatement)) return false; JCExpression expr = ((JCExpressionStatement) statement).expr; if (!(expr instanceof JCMethodInvocation)) return false; JCExpression invocation = ((JCMethodInvocation) expr).meth; String name; if (invocation instanceof JCFieldAccess) { name = ((JCFieldAccess) invocation).name.toString(); } else if (invocation instanceof JCIdent) { name = ((JCIdent) invocation).name.toString(); } else { name = ""; } return "super".equals(name) || "this".equals(name); } /** * 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(field)) { 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 ann = 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 ann = createAnnotation(Getter.class, child); if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter. hasGetterAnnotation = true; } } } if (hasGetterAnnotation) { String getterName = toGetterName(field); if (getterName == null) return null; return new GetterMethod(field.toName(getterName), decl.vartype); } return null; } public 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 (annotationTypeMatches(Getter.class, child)) { AnnotationValues ann = 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, FieldAccess) */ 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.nil(), maker.Select(receiver, getter.name), List.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, getGeneratedBy(field)); List insertAfter = null; List insertBefore = type.defs; while (insertBefore.tail != null) { if (insertBefore.head instanceof JCVariableDecl) { JCVariableDecl f = (JCVariableDecl) insertBefore.head; if (isEnumConstant(f) || isGenerated(f)) { insertAfter = insertBefore; insertBefore = insertBefore.tail; continue; } } break; } List fieldEntry = List.of(field); fieldEntry.tail = insertBefore; if (insertAfter == null) { type.defs = fieldEntry; } else { insertAfter.tail = fieldEntry; } typeNode.add(field, Kind.FIELD); } private static boolean isEnumConstant(final JCVariableDecl field) { return (field.mods.flags & Flags.ENUM) != 0; } /** * 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("")) { //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); if (type.sym != null && type.sym.members_field != null) { type.sym.members_field.remove(((JCMethodDecl)def).sym); } break; } } idx++; } } addSuppressWarningsAll(method.mods, typeNode, method.pos, 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(node, "java", "lang", "SuppressWarnings"); JCLiteral allLiteral = maker.Literal("all"); suppressWarningsType.pos = pos; allLiteral.pos = pos; JCAnnotation annotation = recursiveSetGeneratedBy(maker.Annotation(suppressWarningsType, List.of(allLiteral)), source); annotation.pos = pos; mods.annotations = mods.annotations.append(annotation); } private static List addAllButOne(List defs, int idx) { ListBuffer 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. *

* The position of the generated node(s) will be unpositioned (-1). * * 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(JavacNode node, String... elems) { return chainDots(node, -1, elems); } /** * 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. *

* The position of the generated node(s) will be equal to the {@code pos} parameter. * * 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(JavacNode node, int pos, String... elems) { assert elems != null; assert elems.length > 0; TreeMaker maker = node.getTreeMaker(); if (pos != -1) maker = maker.at(pos); 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(JavacNode node, String elems) { return chainDots(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 findAnnotations(JavacNode fieldNode, Pattern namePattern) { ListBuffer 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(variable, "java", "lang", "NullPointerException"); JCTree exception = treeMaker.NewClass(null, List.nil(), npe, List.of(treeMaker.Literal(fieldName.toString())), null); JCStatement throwStatement = treeMaker.Throw(exception); JCBlock throwBlock = treeMaker.Block(0, List.of(throwStatement)); return treeMaker.If(treeMaker.Binary(CTC_EQUAL, treeMaker.Ident(fieldName), treeMaker.Literal(CTC_BOT, null)), throwBlock, 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 createListOfNonExistentFields(List 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 problematic = ListBuffer.lb(); for (int i = 0 ; i < list.size() ; i++) { if (!matched[i]) problematic.append(i); } return problematic.toList(); } static List unboxAndRemoveAnnotationParameter(JCAnnotation ast, String parameterName, String errorName, JavacNode errorNode) { ListBuffer params = ListBuffer.lb(); ListBuffer result = ListBuffer.lb(); errorNode.removeDeferredErrors(); outer: for (JCExpression param : ast.args) { String nameOfParam = "value"; JCExpression valueOfParam = null; if (param instanceof JCAssign) { JCAssign assign = (JCAssign) param; if (assign.lhs instanceof JCIdent) { JCIdent ident = (JCIdent) assign.lhs; nameOfParam = ident.name.toString(); } valueOfParam = assign.rhs; } if (!parameterName.equals(nameOfParam)) { params.append(param); continue outer; } if (valueOfParam instanceof JCAnnotation) { String dummyAnnotationName = ((JCAnnotation) valueOfParam).annotationType.toString(); dummyAnnotationName = dummyAnnotationName.replace("_", ""); if (dummyAnnotationName.length() > 0) { errorNode.addError("The correct format is " + errorName + "@_({@SomeAnnotation, @SomeOtherAnnotation}))"); continue outer; } for (JCExpression expr : ((JCAnnotation) valueOfParam).args) { if (expr instanceof JCAssign && ((JCAssign) expr).lhs instanceof JCIdent) { JCIdent id = (JCIdent) ((JCAssign) expr).lhs; if ("value".equals(id.name.toString())) { expr = ((JCAssign) expr).rhs; } else { errorNode.addError("The correct format is " + errorName + "@_({@SomeAnnotation, @SomeOtherAnnotation}))"); continue outer; } } if (expr instanceof JCAnnotation) { result.append((JCAnnotation) expr); } else if (expr instanceof JCNewArray) { for (JCExpression expr2 : ((JCNewArray) expr).elems) { if (expr2 instanceof JCAnnotation) { result.append((JCAnnotation) expr2); } else { errorNode.addError("The correct format is " + errorName + "@_({@SomeAnnotation, @SomeOtherAnnotation}))"); continue outer; } } } else { errorNode.addError("The correct format is " + errorName + "@_({@SomeAnnotation, @SomeOtherAnnotation}))"); continue outer; } } } else { if (valueOfParam instanceof JCNewArray && ((JCNewArray) valueOfParam).elems.isEmpty()) { // Then we just remove it and move on (it's onMethod={} for example). } else { errorNode.addError("The correct format is " + errorName + "@_({@SomeAnnotation, @SomeOtherAnnotation}))"); } } } ast.args = params.toList(); return result.toList(); } static List copyAnnotations(List in) { ListBuffer out = ListBuffer.lb(); for (JCExpression expr : in) { if (!(expr instanceof JCAnnotation)) continue; out.append((JCAnnotation) expr.clone()); } return out.toList(); } static boolean isClass(JavacNode typeNode) { return isClassAndDoesNotHaveFlags(typeNode, Flags.INTERFACE | Flags.ENUM | Flags.ANNOTATION); } static boolean isClassOrEnum(JavacNode typeNode) { return isClassAndDoesNotHaveFlags(typeNode, Flags.INTERFACE | Flags.ANNOTATION); } private static boolean isClassAndDoesNotHaveFlags(JavacNode typeNode, int flags) { JCClassDecl typeDecl = null; if (typeNode.get() instanceof JCClassDecl) typeDecl = (JCClassDecl)typeNode.get(); else return false; long typeDeclflags = typeDecl == null ? 0 : typeDecl.mods.flags; return (typeDeclflags & flags) == 0; } public static JavacNode upToTypeNode(JavacNode node) { if (node == null) throw new NullPointerException("node"); while ((node != null) && !(node.get() instanceof JCClassDecl)) node = node.up(); return node; } /** * Creates a full clone of a given javac AST type node. Every part is cloned (every identifier, every select, every wildcard, every type apply). * * If there's any node in the tree that we don't know how to clone, that part isn't cloned. However, we wouldn't know what could possibly show up that we * can't currently clone; that's just a safeguard. * * This should be used if the type looks the same in the code, but resolves differently. For example, a static method that has some generics in it named after * the class's own parameter, but as its a static method, the static method's notion of {@code T} is different from the class notion of {@code T}. If you're duplicating * a type used in the class context, you need to use this method. */ public static JCExpression cloneType(TreeMaker maker, JCExpression in, JCTree source) { JCExpression out = cloneType0(maker, in); if (out != null) recursiveSetGeneratedBy(out, source); return out; } private static JCExpression cloneType0(TreeMaker maker, JCTree in) { if (in == null) return null; if (in instanceof JCPrimitiveTypeTree) return (JCExpression) in; if (in instanceof JCIdent) { return maker.Ident(((JCIdent) in).name); } if (in instanceof JCFieldAccess) { JCFieldAccess fa = (JCFieldAccess) in; return maker.Select(cloneType0(maker, fa.selected), fa.name); } if (in instanceof JCArrayTypeTree) { JCArrayTypeTree att = (JCArrayTypeTree) in; return maker.TypeArray(cloneType0(maker, att.elemtype)); } if (in instanceof JCTypeApply) { JCTypeApply ta = (JCTypeApply) in; ListBuffer lb = ListBuffer.lb(); for (JCExpression typeArg : ta.arguments) { lb.append(cloneType0(maker, typeArg)); } return maker.TypeApply(cloneType0(maker, ta.clazz), lb.toList()); } if (in instanceof JCWildcard) { JCWildcard w = (JCWildcard) in; JCExpression newInner = cloneType0(maker, w.inner); TypeBoundKind newKind; switch (w.getKind()) { case SUPER_WILDCARD: newKind = maker.TypeBoundKind(BoundKind.SUPER); break; case EXTENDS_WILDCARD: newKind = maker.TypeBoundKind(BoundKind.EXTENDS); break; default: case UNBOUNDED_WILDCARD: newKind = maker.TypeBoundKind(BoundKind.UNBOUND); break; } return maker.Wildcard(newKind, newInner); } // This is somewhat unsafe, but it's better than outright throwing an exception here. Returning null will just cause an exception down the pipeline. return (JCExpression) in; } }