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Checker Qual is the set of annotations (qualifiers) and supporting classes used by the Checker Framework to type check Java source code. Please see artifact: org.checkerframework:checker

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package javax.annotation.meta;

/**
 * Used to describe the relationship between a qualifier T and the set of values
 * S possible on an annotated element.
 */
public enum When {
    /** S is a subset of T */
    ALWAYS,
    /** nothing definitive is known about the relation between S and T */
    UNKNOWN,
    /** S intersection T is non empty and S - T is nonempty */
    MAYBE,
    /** S intersection T is empty */
    NEVER;
}