/**
* 数据大小比较工具
*/
package org.opencloudb.util;
public class CompareUtil {
public static int compareInt(int l,int r){
if(l > r){
return 1;
}else if(l < r){
return -1;
}else{
return 0;
}
}
public static int compareDouble(double l,double r){
if(l > r){
return 1;
}else if(l < r){
return -1;
}else{
return 0;
}
}
public static int compareFloat(float l,float r){
if(l > r){
return 1;
}else if(l < r){
return -1;
}else{
return 0;
}
}
public static int compareLong(long l,long r){
// System.out.println(l + " " + r);
if(l > r){
return 1;
}else if(l < r){
return -1;
}else{
return 0;
}
}
public static int compareString(String l,String r){
return compareStringForChinese(l,r);
// return l.compareTo(r);
}
public static int compareChar(char l,char r){
if(l > r){
return 1;
}else if(l < r){
return -1;
}else{
return 0;
}
}
public static int compareUtilDate(Object left,Object right){
java.util.Date l = (java.util.Date)left;
java.util.Date r = (java.util.Date)right;
return l.compareTo(r);
}
public static int compareSqlDate(Object left,Object right){
java.sql.Date l = (java.sql.Date)left;
java.sql.Date r = (java.sql.Date)right;
return l.compareTo(r);
}
private static int compareStringForChinese(String s1, String s2){
String m_s1 = null, m_s2 = null;
try{
//先将两字符串编码成GBK
m_s1 = new String ( s1.getBytes("GB2312"), "GBK");
m_s2 = new String ( s2.getBytes("GB2312"), "GBK");
}
catch( Exception ex)
{
ex.printStackTrace();
return s1.compareTo(s2);
}
int res = chineseCompareTo(m_s1, m_s2);
// System.out.println("比较：" + s1 + " | " + s2 + "==== Result: " + res);
return res;
}
//获取一个汉字/字母的Char值
private static int getCharCode(String s){
if (s==null || s.length()==0) return -1;//保护代码
byte [] b = s.getBytes();
int value = 0;
//保证取第一个字符（汉字或者英文）
for (int i = 0; i < b.length && i <= 2; i ++){
value = value*100+b[i];
}
if(value < 0){
value += 100000;
}
return value;
}
//比较两个字符串
private static int chineseCompareTo(String s1, String s2){
int len1 = s1.length();
int len2 = s2.length();
int n = Math.min(len1, len2);
for (int i = 0; i < n; i ++){
int s1_code = getCharCode(s1.charAt(i) + "");
int s2_code = getCharCode(s2.charAt(i) + "");
if (s1_code != s2_code){
return s1_code - s2_code;
}
}
return len1 - len2;
}
}