| package org.checkerframework.checker.nullness.qual; |
| |
| import java.lang.annotation.Documented; |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| import org.checkerframework.framework.qual.PolymorphicQualifier; |
| |
| /** |
| * A polymorphic qualifier for the non-null type system. |
| * |
| * <p>Any method written using {@link PolyNull} conceptually has two versions: one in which every |
| * instance of {@link PolyNull} has been replaced by {@link NonNull}, and one in which every |
| * instance of {@link PolyNull} has been replaced by {@link Nullable}. |
| * |
| * @checker_framework.manual #nullness-checker Nullness Checker |
| * @checker_framework.manual #qualifier-polymorphism Qualifier polymorphism |
| */ |
| @Documented |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER}) |
| @PolymorphicQualifier(Nullable.class) |
| public @interface PolyNull {} |