@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);
}
