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    • com.github.datalking.common.OrderComparator Maven / Gradle / Ivy

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    package com.github.datalking.common;

import com.github.datalking.util.ObjectUtils;

import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * @author yaoo on 4/19/18
 */
public class OrderComparator implements Comparator {


    public static final OrderComparator INSTANCE = new OrderComparator();

    @Override
    public int compare(Object o1, Object o2) {
        return doCompare(o1, o2, null);
    }

    private int doCompare(Object o1, Object o2, OrderSourceProvider sourceProvider) {
        boolean p1 = (o1 instanceof PriorityOrdered);
        boolean p2 = (o2 instanceof PriorityOrdered);
        if (p1 && !p2) {
            return -1;
        } else if (p2 && !p1) {
            return 1;
        }

        int i1 = getOrder(o1, sourceProvider);
        int i2 = getOrder(o2, sourceProvider);
        return (i1 < i2) ? -1 : (i1 > i2) ? 1 : 0;
    }

    private int getOrder(Object obj, OrderSourceProvider sourceProvider) {
        Integer order = null;
        if (sourceProvider != null) {
            Object orderSource = sourceProvider.getOrderSource(obj);
            if (orderSource != null && orderSource.getClass().isArray()) {
                Object[] sources = ObjectUtils.toObjectArray(orderSource);
                for (Object source : sources) {
                    order = findOrder(source);
                    if (order != null) {
                        break;
                    }
                }
            } else {
                order = findOrder(orderSource);
            }
        }
        return (order != null ? order : getOrder(obj));
    }

    protected int getOrder(Object obj) {
        Integer order = findOrder(obj);
        return (order != null ? order : Ordered.LOWEST_PRECEDENCE);
    }

    protected Integer findOrder(Object obj) {
        return (obj instanceof Ordered ? ((Ordered) obj).getOrder() : null);
    }

    public Integer getPriority(Object obj) {
        return null;
    }

    public static void sort(List list) {
        if (list.size() > 1) {
            Collections.sort(list, INSTANCE);
        }
    }

    public static void sort(Object[] array) {
        if (array.length > 1) {
            Arrays.sort(array, INSTANCE);
        }
    }

    public interface OrderSourceProvider {

        Object getOrderSource(Object obj);
    }

}
    
    
    
    

    




    
    
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