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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 org.checkerframework.common.reflection.qual;

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.SubtypeOf;

/**
 * This represents a {@link java.lang.Class Class<T>} object
 * where the set of possible values of T is known at compile time.  If only
 * one argument is given, then the exact value of T is known.  If more than
 * one argument is given, then the value of T is one of those classes.
 *
 * @checker_framework.manual #methodval-and-classval-checkers ClassVal Checker
 */
@SubtypeOf({ UnknownClass.class })
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE_USE, ElementType.TYPE_PARAMETER })
public @interface ClassVal {
    /** The binary name
     * of the class that this Class object represents. */
    String[] value();
}