import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**判断某个值是否在某个区间工具类,返回booblean值
*/
public class IntervalUtil {
/**
* 判断data_value是否在interval区间范围内
* @param data_value 数值类型的
* @param interval 正常的数学区间,包括无穷大等,如:(1,3)、>5%、(-∞,6]、(125%,135%)U(70%,80%)
* @return true:表示data_value在区间interval范围内,false:表示data_value不在区间interval范围内
*/
public static boolean isInTheInterval(String data_value,String interval) {
//将区间和data_value转化为可计算的表达式
String formula = getFormulaByAllInterval(data_value,interval,"||");
ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");
try {
//计算表达式
return (Boolean) jse.eval(formula);
} catch (Exception t) {
return false;
}
}
/**
* 将所有阀值区间转化为公式:如
* [75,80) =》 date_value < 80 && date_value >= 75
* (125%,135%)U(70%,80%) =》 (date_value < 1.35 && date_value > 1.25) || (date_value < 0.8 && date_value > 0.7)
* @param date_value
* @param interval 形式如:(125%,135%)U(70%,80%)
* @param connector 连接符 如:") || ("
*/
private static String getFormulaByAllInterval(String date_value, String interval, String connector) {
StringBuffer buff = new StringBuffer();
for(String limit:interval.split("U")){//如:(125%,135%)U (70%,80%)
buff.append("(").append(getFormulaByInterval(date_value, limit," && ")).append(")").append(connector);
}
String allLimitInvel = buff.toString();
int index = allLimitInvel.lastIndexOf(connector);
allLimitInvel = allLimitInvel.substring(0,index);
return allLimitInvel;
}
/**
* 将整个阀值区间转化为公式:如
* 145) =》 date_value < 145
* [75,80) =》 date_value < 80 && date_value >= 75
* @param date_value
* @param interval 形式如:145)、[75,80)
* @param connector 连接符 如:&&
*/
private static String getFormulaByInterval(String date_value, String interval, String connector) {
StringBuffer buff = new StringBuffer();
for(String halfInterval:interval.split(",")){//如:[75,80)、≥80
buff.append(getFormulaByHalfInterval(halfInterval, date_value)).append(connector);
}
String limitInvel = buff.toString();
int index = limitInvel.lastIndexOf(connector);
limitInvel = limitInvel.substring(0,index);
return limitInvel;
}
/**
* 将半个阀值区间转化为公式:如
* 145) =》 date_value < 145
* ≥80% =》 date_value >= 0.8
* [130 =》 date_value >= 130
* <80% =》 date_value < 0.8
* @param halfInterval 形式如:145)、≥80%、[130、<80%
* @param date_value
* @return date_value < 145
*/
private static String getFormulaByHalfInterval(String halfInterval, String date_value) {
halfInterval = halfInterval.trim();
if(halfInterval.contains("∞")){//包含无穷大则不需要公式
return "1 == 1";
}
StringBuffer formula = new StringBuffer();
String data = "";
String opera = "";
if(halfInterval.matches("^([<>≤≥\\[\\(]{1}(-?\\d+.?\\d*\\%?))$")){//表示判断方向(如>)在前面 如:≥80%
opera = halfInterval.substring(0,1);
data = halfInterval.substring(1);
}else{//[130、145)
opera = halfInterval.substring(halfInterval.length()-1);
data = halfInterval.substring(0,halfInterval.length()-1);
}
double value = dealPercent(data);
formula.append(date_value).append(" ").append(opera).append(" ").append(value);
String a = formula.toString();
//转化特定字符
return a.replace("[", ">=").replace("(", ">").replace("]", "<=").replace(")", "<").replace("≤", "<=").replace("≥", ">=");
}
/**
* 去除百分号,转为小数
* @param str 可能含百分号的数字
* @return
*/
private static double dealPercent(String str){
double d = 0.0;
if(str.contains("%")){
str = str.substring(0,str.length()-1);
d = Double.parseDouble(str)/100;
}else{
d = Double.parseDouble(str);
}
return d;
}
public static void main(String[] args) {
System.out.println(IntervalUtil.isInTheInterval("10", "[9,11)"));
}
}
网友评论