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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.common.value.qual;

import org.checkerframework.framework.qual.SubtypeOf;

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;

/**
 * An expression with this type evaluates to an array or a string whose length is in the given
 * range. The bounds are inclusive; for example, {@code @ArrayLenRange(from=6, to=9)} represents an
 * array or a string with four possible values for its length: 6, 7, 8, and 9.
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_PARAMETER, ElementType.TYPE_USE})
@SubtypeOf(UnknownVal.class)
public @interface ArrayLenRange {
    /**
     * Smallest value in the range, inclusive.
     *
     * @return the smallest value in the range, inclusive
     */
    int from() default 0;

    /**
     * Largest value in the range, inclusive.
     *
     * @return the largest value in the range, inclusive
     */
    int to() default Integer.MAX_VALUE;
}