test/langtools/tools/javac/patterns/SwitchErrors.java

/*
 * @test /nodynamiccopyright/
 * @bug 8262891 8269146 8269113 8348928
 * @summary Verify errors related to pattern switches.
 * @compile/fail/ref=SwitchErrors.out -XDrawDiagnostics -XDshould-stop.at=FLOW SwitchErrors.java
 */

public class SwitchErrors {
    void incompatibleSelectorObjectString(Object o) {
        switch (o) {
            case "A": break;
            case CharSequence cs: break;
        }
    }
    void incompatibleSelectorObjectInteger(Object o) {
        switch (o) {
            case 1: break;
            case CharSequence cs: break;
        }
    }
    void incompatibleSelectorIntegerString(Integer i) {
        switch (i) {
            case "A": break;
            case CharSequence cs: break;
        }
    }
    void incompatibleSelectorPrimitive(int i) {
        switch (i) {
            case null: break;
            case "A": break;
            case CharSequence cs: break;
        }
    }
    void totalAndDefault1(Object o) {
        switch (o) {
            case Object obj: break;
            default: break;
        }
    }
    void totalAndDefault2(Object o) {
        switch (o) {
            case Object obj: break;
            case null, default: break;
        }
    }
    void totalAndDefault3(Object o) {
        switch (o) {
            default: break;
            case Object obj: break;
        }
    }
    void duplicatedTotal(Object o) {
        switch (o) {
            case Object obj: break;
            case Object obj: break;
        }
    }
    void duplicatedDefault1(Object o) {
        switch (o) {
            case null, default: break;
            default: break;
        }
    }
    void duplicatedDefault2(Object o) {
        switch (o) {
            case default: break;
            default: break;
        }
    }
    void duplicatedDefault3(Object o) {
        switch (o) {
            case default, default: break;
        }
    }
    void duplicatedNullCase1(Object o) {
        switch (o) {
            case null: break;
            case null: break;
        }
    }
    void duplicatedNullCase2(Object o) {
        switch (o) {
            case null, null: break;
        }
    }
    void duplicatedTypePatterns1(Object o) {
        switch (o) {
            case String s, Integer i: break;
        }
    }
    void duplicatedTypePatterns2(Object o) {
        switch (o) {
            case String s:
            case Integer i: break;
        }
    }
    void duplicatedTypePatterns3(Object o) {
        switch (o) {
            case String s:
                System.err.println(1);
            case Integer i: break;
        }
    }
    void flowIntoTypePatterns(Object o) {
        switch (o) {
            case null:
                System.err.println(1);
            case Integer i: break;
        }
    }
    void incompatible1(String str) {
        switch (str) {
            case Integer i: break;
            default: break;
        }
    }
    void incompatible2(java.util.List l) {
        switch (l) {
            case java.util.List<Integer> l2: break;
        }
    }
    void erroneous(Object o) {
        switch (o) {
            case String s: break;
            case Undefined u: break;
            case Integer i: break;
            default: break;
        }
    }
    void patternAndDefault1(Object o) {
        switch (o) {
            case String s, default: break;
        }
    }
    void patternAndDefault2(Object o) {
        switch (o) {
            case String s:
            case default: break;
        }
    }
    void patternAndDefault3(Object o) {
        switch (o) {
            case default, String s: break;
        }
    }
    void patternAndDefault4(Object o) {
        switch (o) {
            case default:
            case String s: break;
        }
    }
    void sealedNonAbstract(SealedNonAbstract obj) {
        switch (obj) {//does not cover SealedNonAbstract
            case A a -> {}
        }
    }
    sealed class SealedNonAbstract permits A {}
    final class A extends SealedNonAbstract {}
    void errorRecoveryNoPattern1(Object o) {
        switch (o) {
            case String: break;
            case Object obj: break;
        }
    }
    Object guardWithMatchingStatement(Object o1, Object o2) {
        switch (o1) {
            case String s when s.isEmpty() || o2 instanceof Number n: return n;
            default: return null;
        }
    }
    Object guardWithMatchingExpression(Object o1, Object o2) {
        return switch (o1) {
            case String s when s.isEmpty() || o2 instanceof Number n -> n;
            default -> null;
        };
    }
    void test8269146a1(Integer i) {
        switch (i) {
            //error - illegal combination of pattern and constant:
            case 1, Integer o when o != null:
                break;
            default:
                break;
        }
    }
    void test8269146a2a(Integer i) {
        switch (i) {
            //error - illegal combination of pattern and constant:
            case Integer o, 1:
                break;
            default:
                break;
        }
    }
    void test8269146b(Integer i) {
        switch (i) {
            //error - illegal combination of null and pattern other than type pattern:
            case null, Integer o when o != null:
                break;
            default:
                break;
        }
    }
    void test8269146c(Integer i) {
        switch (i) {
            //error - illegal combination of pattern and default:
            case Integer o, default:
                break;
        }
    }
    void test8269301a(Integer i) {
        switch (i) {
            //error - illegal combination of pattern, constant and default
            case 1, Integer o, default:
                break;
        }
    }
    void test8269301ba(Integer i) {
        switch (i) {
            //error - illegal combination of pattern, constant and default
            case Integer o, 1, default:
                break;
        }
    }
    void exhaustiveAndNull(String s) {
        switch (s) {
            case null: break;
        }
    }
    void referenceTypeTotalForNull() {
        switch (null) {
            case String s: break;
            case CharSequence cs: break;
        }
    }
    void nullAndParenthesized1(Object o) {
        record R(Object o) {}
        switch (o) {
            case null, R r: break;
            default: break;
        }
    }
    void nullAndParenthesized2(Object o) {
        record R(Object o) {}
        switch (o) {
            case null, R(var v): break;
            default: break;
        }
    }
    void nullAndParenthesized3(Object o) {
        record R(Object o) {}
        switch (o) {
            case R r: case null: break;
            default: break;
        }
    }
    void nullAndParenthesized4(Object o) {
        record R(Object o) {}
        switch (o) {
            case R(var v): case null: break;
            default: break;
        }
    }
    void noDiamond(Object o) {
        record R<T>(T t) {}
        switch (o) {
            case R<> r -> {}
            default -> {}
        }
        if (o instanceof R<> r) {}
    }
    void noRawInferenceNonDeconstruction() {
        record R<T>(T t) {}
        R<String> o = null;
        switch (o) {
            case R r -> System.out.println(r.t().length());
        }
        if (o instanceof R r) System.out.println(r.t().length());
    }
    void cannotInfer() {
        interface A<T> {}
        record R<T extends Number>() implements A<T> {}
        A<String> i = null;
        if (i instanceof R()) {
        }
    }
    void test8269146a2b(Integer i) {
        switch (i) {
            //error - illegal combination of pattern and constant:
            case Integer o when o != null, 1:
                break;
            default:
                break;
        }
    }
    void test8269301ab(Integer i) {
        switch (i) {
            //error - illegal combination of pattern, constant and default
            case 1, Integer o when o != null, default:
                break;
        }
    }
    void test8269301bb(Integer i) {
        switch (i) {
            //error - illegal combination of pattern, constant and default
            case Integer o when o != null, 1, default:
                break;
        }
    }

    void testPatternWithoutBindingCantOverridePatternWithBinding8348928a(Object o) {
        record R(int i, String s) {}
        switch (o) {
            case Integer _, R(int x, String _) -> {}
            default -> {}
        }
    }

    void testPatternWithoutBindingCantOverridePatternWithBinding8348928b(Object o) {
        record R(int i, String s) {}
        switch (o) {
            case Integer _:
            case R(int x, String _):
                break;
            default:
        }
    }
}