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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.javacutil;

import java.lang.annotation.Annotation;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;

import com.sun.source.tree.Tree;

/**
 * An implementation of AnnotationProvider returns annotations on
 * Java AST elements.
 */
public interface AnnotationProvider {

    /**
     * Returns the actual annotation mirror used to annotate this type,
     * whose name equals the passed annotationName if one exists, null otherwise.
     *
     * @param anno annotation class
     * @return the annotation mirror for anno
     */
    public AnnotationMirror getDeclAnnotation(Element elt,
            Class anno);

    /**
     * Return the annotation on tree that has the class
     * target. If no annotation for the given target class exists,
     * the result is null
     *
     * @param tree
     *            The tree of which the annotation is returned
     * @param target
     *            The class of the annotation
     */
    public AnnotationMirror getAnnotationMirror(Tree tree,
            Class target);
}