package com.java110.event.center;
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import com.java110.event.app.order.Ordered;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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/**
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* 侦听排序类
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* Created by wuxw on 2018/4/17.
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*/
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public class DataFlowListenerOrderComparator implements Comparator<Object> {
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public static final DataFlowListenerOrderComparator INSTANCE = new DataFlowListenerOrderComparator();
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public static void sort(List<?> list) {
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if (list.size() > 1) {
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Collections.sort(list, INSTANCE);
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}
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}
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@Override
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public int compare(Object o1, Object o2) {
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return doCompare(o1,o2);
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}
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private Integer getOrder(Object obj){
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return (obj instanceof Ordered ? ((Ordered) obj).getOrder() : null);
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}
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private int doCompare(Object o1, Object o2) {
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boolean p1 = (o1 instanceof Ordered);
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boolean p2 = (o2 instanceof Ordered);
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if (p1 && !p2) {
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return -1;
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}
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else if (p2 && !p1) {
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return 1;
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}
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int i1 = getOrder(o1);
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int i2 = getOrder(o2);
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return (i1 < i2) ? -1 : (i1 > i2) ? 1 : 0;
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}
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}
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