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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.framework.util.defaults;

import org.checkerframework.framework.qual.TypeUseLocation;
import org.checkerframework.javacutil.AnnotationUtils;

import javax.lang.model.element.AnnotationMirror;

/**
 * Represents a mapping from an Annotation to a TypeUseLocation it should be applied to during defaulting.
 * The Comparable ordering of this class first tests location then tests annotation ordering (via
 * {@link org.checkerframework.javacutil.AnnotationUtils}).
 *
 * It also has a handy toString method that is useful for debugging.
 */
class Default implements Comparable {
    // please remember to add any fields to the hashcode calculation
    public final AnnotationMirror anno;
    public final TypeUseLocation location;

    public Default(final AnnotationMirror anno, final TypeUseLocation location) {
        this.anno     = anno;
        this.location = location;
    }

    @Override
    public int compareTo(Default other) {
        int locationOrder = location.compareTo(other.location);
        if (locationOrder == 0) {
            return AnnotationUtils.annotationOrdering().compare(anno, other.anno);
        } else {
            return locationOrder;
        }
    }

    @Override
    public boolean equals(Object thatObj) {
        if (thatObj == this) {
            return true;
        }

        if (thatObj == null || !thatObj.getClass().equals(Default.class)) {
            return false;
        }

        return compareTo((Default) thatObj) == 0;
    }

    @Override
    public int hashCode() {
        return 13 + (anno == null     ? 0 : 37 * anno.hashCode())
                  + (location == null ? 0 : 41 * location.hashCode());

    }

    @Override
    public String toString() {
        return "( " + location.name() + " => " + anno + " )";
    }
}