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import org.checkerframework.checker.nullness.NullnessUtil;
import org.checkerframework.checker.nullness.qual.*;
/** Test class org.checkerframework.checker.nullness.NullnessUtil. */
class TestNullnessUtil {
void testRef1(@Nullable Object o) {
// one way to use as a cast:
@NonNull Object l1 = NullnessUtil.castNonNull(o);
}
void testRef2(@Nullable Object o) {
// another way to use as a cast:
NullnessUtil.castNonNull(o).toString();
}
void testRef3(@Nullable Object o) {
// use as statement:
NullnessUtil.castNonNull(o);
o.toString();
}
void testArr1(@Nullable Object @NonNull [] a) {
// one way to use as a cast:
@NonNull Object[] l2 = NullnessUtil.castNonNullDeep(a);
// Careful, the non-deep version only casts the main modifier.
// :: error: (assignment.type.incompatible)
@NonNull Object[] l2b = NullnessUtil.castNonNull(a);
// OK
@Nullable Object[] l2c = NullnessUtil.castNonNull(a);
}
void testArr1b(@Nullable Object @Nullable [] a) {
// one way to use as a cast:
@NonNull Object[] l2 = NullnessUtil.castNonNullDeep(a);
// Careful, the non-deep version only casts the main modifier.
// :: error: (assignment.type.incompatible)
@NonNull Object[] l2b = NullnessUtil.castNonNull(a);
// OK
@Nullable Object[] l2c = NullnessUtil.castNonNull(a);
}
void testArr2(@Nullable Object @NonNull [] a) {
// another way to use as a cast:
NullnessUtil.castNonNullDeep(a)[0].toString();
}
void testArr3(@Nullable Object @NonNull [] a) {
// use as statement:
NullnessUtil.castNonNullDeep(a);
a.toString();
// TODO: @EnsuresNonNull cannot express that
// all the array components are non-null.
// a[0].toString();
}
/*
// TODO: flow does not propagate component types.
void testArr3(@Nullable Object @NonNull [] a) {
// one way to use as a statement:
NullnessUtil.castNonNull(a);
a[0].toString();
}
*/
void testMultiArr1(@Nullable Object @NonNull [] @Nullable [] a) {
// :: error: (assignment.type.incompatible) :: error: (accessing.nullable)
@NonNull Object l3 = a[0][0];
// one way to use as a cast:
@NonNull Object[][] l4 = NullnessUtil.castNonNullDeep(a);
}
void testMultiArr2(@Nullable Object @NonNull [] @Nullable [] a) {
// another way to use as a cast:
NullnessUtil.castNonNullDeep(a)[0][0].toString();
}
void testMultiArr3(@Nullable Object @Nullable [] @Nullable [] @Nullable [] a) {
// :: error: (dereference.of.nullable) :: error: (accessing.nullable)
a[0][0][0].toString();
// another way to use as a cast:
NullnessUtil.castNonNullDeep(a)[0][0][0].toString();
}
public static void main(String[] args) {
Object[] @Nullable [] err = new Object[10][10];
Object[][] e1 = NullnessUtil.castNonNullDeep(err);
e1[0][0].toString();
}
}
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