/**
* 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 JCStatement buildTryCatchBlock(
JavacNode node, List<JCStatement> contents, String exception) {
TreeMaker maker = node.getTreeMaker();
JCBlock tryBlock = maker.Block(0, contents);
JCExpression varType = chainDots(maker, node, exception.split("\\."));
JCVariableDecl catchParam =
maker.VarDef(maker.Modifiers(Flags.FINAL), node.toName("$ex"), varType, null);
JCExpression lombokLombokSneakyThrowNameRef =
chainDots(maker, node, "lombok", "Lombok", "sneakyThrow");
JCBlock catchBody =
maker.Block(
0,
List.<JCStatement>of(
maker.Throw(
maker.Apply(
List.<JCExpression>nil(),
lombokLombokSneakyThrowNameRef,
List.<JCExpression>of(maker.Ident(node.toName("$ex")))))));
return maker.Try(tryBlock, List.of(maker.Catch(catchParam, catchBody)), null);
}
