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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.checker.units.qual;

import java.lang.annotation.Annotation;

/**
 * Define the relation between a base unit and the current unit.
 * 
 * TODO: add support for factors and more general formulas?
 * E.g. it would be cool if the relation hour → minute and
 * Fahrenheit → Celsius could be expressed.
 */
public @interface UnitsMultiple {
    /**
     * @return the base unit to use
     */
    Class quantity();

    /**
     * @return the scaling prefix
     */
    Prefix prefix() default Prefix.one;
}