@Override public boolean handle( AnnotationValues<Synchronized> annotation, JCAnnotation ast, Node annotationNode) { Node methodNode = annotationNode.up(); if (methodNode == null || methodNode.getKind() != Kind.METHOD || !(methodNode.get() instanceof JCMethodDecl)) { annotationNode.addError("@Synchronized is legal only on methods."); return true; } JCMethodDecl method = (JCMethodDecl) methodNode.get(); if ((method.mods.flags & Flags.ABSTRACT) != 0) { annotationNode.addError("@Synchronized is legal only on concrete methods."); return true; } boolean isStatic = (method.mods.flags & Flags.STATIC) != 0; String lockName = annotation.getInstance().value(); boolean autoMake = false; if (lockName.length() == 0) { autoMake = true; lockName = isStatic ? STATIC_LOCK_NAME : INSTANCE_LOCK_NAME; } TreeMaker maker = methodNode.getTreeMaker(); if (fieldExists(lockName, methodNode) == MemberExistsResult.NOT_EXISTS) { if (!autoMake) { annotationNode.addError("The field " + new String(lockName) + " does not exist."); return true; } JCExpression objectType = chainDots(maker, methodNode, "java", "lang", "Object"); // We use 'new Object[0];' because quite unlike 'new Object();', empty arrays *ARE* // serializable! JCNewArray newObjectArray = maker.NewArray( chainDots(maker, methodNode, "java", "lang", "Object"), List.<JCExpression>of(maker.Literal(TypeTags.INT, 0)), null); JCVariableDecl fieldDecl = maker.VarDef( maker.Modifiers(Flags.FINAL | (isStatic ? Flags.STATIC : 0)), methodNode.toName(lockName), objectType, newObjectArray); injectField(methodNode.up(), fieldDecl); } if (method.body == null) return false; JCExpression lockNode = maker.Ident(methodNode.toName(lockName)); method.body = maker.Block(0, List.<JCStatement>of(maker.Synchronized(lockNode, method.body))); methodNode.rebuild(); return true; }
/** * 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.<JCExpression>nil(), npe, List.<JCExpression>of(treeMaker.Literal(fieldName.toString())), null); JCStatement throwStatement = treeMaker.Throw(exception); return treeMaker.If( treeMaker.Binary(CTC_EQUAL, treeMaker.Ident(fieldName), treeMaker.Literal(CTC_BOT, null)), throwStatement, null); }
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.<JCExpression>of(allLiteral)), source); annotation.pos = pos; mods.annotations = mods.annotations.append(annotation); }