Compares two AnnotatedElement instances to see if they basically define the same data. - Java java.lang.annotation

Java examples for java.lang.annotation:Annotation Element

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Description

Compares two AnnotatedElement instances to see if they basically define the same data.

Demo Code

/**//  w  ww  .  j a  v a 2s . c  om
 * Copyright (C) 2009-2010 Wilfred Springer
 *
 * This file is part of Preon.
 *
 * Preon is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2, or (at your option) any later version.
 *
 * Preon is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * Preon; see the file COPYING. If not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Linking this library statically or dynamically with other modules is making a
 * combined work based on this library. Thus, the terms and conditions of the
 * GNU General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent modules, and
 * to copy and distribute the resulting executable under terms of your choice,
 * provided that you also meet, for each linked independent module, the terms
 * and conditions of the license of that module. An independent module is a
 * module which is not derived from or based on this library. If you modify this
 * library, you may extend this exception to your version of the library, but
 * you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */
//package com.java2s;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;

public class Main {
    /**
     * Compares two AnnotatedElement instances to see if they basically define the same data. Currently ignores array
     * type of elements.
     *
     * @param first  The first {@link AnnotatedElement}.
     * @param second The second {@link AnnotatedElement}
     * @return A boolean indicating whether or not these are considered to be equivalent.
     */
    public static boolean equivalent(AnnotatedElement first,
            AnnotatedElement second) {
        if (first == null || second == null
                || first.getAnnotations() == null
                || second.getAnnotations() == null) {
            return false;
        } else {
            if (first.getAnnotations().length != second.getAnnotations().length) {
                // If the number of annotations doesn't add up, there is nothing left to compare. 
                return false;
            } else {
                for (Annotation annotation : first.getAnnotations()) {
                    Annotation other = second.getAnnotation(annotation
                            .annotationType());
                    if (!annotation.equals(other)) {
                        return false;
                    }
                }
                return true;
            }
        }
    }
}

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