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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.fenum.qual;

import java.lang.annotation.*;

import org.checkerframework.framework.qual.*;

/**
 * Basic alpha compositing rules for combining source and
 * destination colors to achieve blending and transparency
 * effects with graphics and images (see
 * {@link java.awt.AlphaComposite} for more details).
 * @see java.awt.AlphaComposite#CLEAR
 * @see java.awt.AlphaComposite#SRC
 * @see java.awt.AlphaComposite#DST
 * @see java.awt.AlphaComposite#SRC_OVER
 * @see java.awt.AlphaComposite#DST_OVER
 * @see java.awt.AlphaComposite#SRC_IN
 * @see java.awt.AlphaComposite#DST_IN
 * @see java.awt.AlphaComposite#SRC_OUT
 * @see java.awt.AlphaComposite#DST_OUT
 * @see java.awt.AlphaComposite#SRC_ATOP
 * @see java.awt.AlphaComposite#DST_ATOP
 * @see java.awt.AlphaComposite#XOR
 * @checker_framework.manual #fenum-checker Fake Enum Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf(FenumTop.class)
public @interface AwtAlphaCompositingRule {}