ActivationComparator.java

/*
 *  Copyright 2009-2016 Weibo, Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package com.weibo.api.motan.core.extension;

import java.util.Comparator;

/**
 * 
 * Priority comparator
 *
 * @author fishermen
 * @version V1.0 created at: 2013-5-30
 */

public class ActivationComparator<T> implements Comparator<T> {

    /**
     * sequence 大的排在后面,如果没有设置sequence的排到最前面
     */
    @Override
    public int compare(T o1, T o2) {
        Activation p1 = o1.getClass().getAnnotation(Activation.class);
        Activation p2 = o2.getClass().getAnnotation(Activation.class);
        if (p1 == null) {
            return 1;
        } else if (p2 == null) {
            return -1;
        } else {
            return p1.sequence() - p2.sequence();
        }
    }


}