rowidcomparator.java

struts + spring + hibernate的例子,用IntelliJ IDEA制作

package net.jetmaven.util;

import org.apache.commons.lang.StringUtils;

import java.util.Comparator;

/**
 * Comparator for rowId,just like row22345,如果为数字，按升序，
 * 字符串按hashcode。
 *
 * @author <a href="mailto:[e-mail]">chenlibing</a>
 *         Date: 2004-2-2
 */
public class RowIdComparator implements Comparator
{
    private String prefix;

    public RowIdComparator()
    {

    }

    /**
     * 去除prefix进行排序
     *
     * @param prefix   前缀
     */
    public RowIdComparator(String prefix)
    {
        this.prefix = prefix;
    }

    public int compare(Object o1, Object o2)
    {
        long result = 0;
        int prefixLenth = (prefix == null ? 0 : prefix.length());
        String o1_temp = o1.toString().substring(prefixLenth);
        String o2_temp = o2.toString().substring(prefixLenth);
        if (StringUtils.isNumeric(o1_temp) && StringUtils.isNumeric(o2_temp))
        {
            result = Long.parseLong(o1_temp) - Long.parseLong(o2_temp);
        } else
        {
            result = o1.hashCode() - o2.hashCode();
        }
        return (int) result;
    }

}