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高级筛选

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高级筛选

Java解析运算表达式

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        //高级筛选 option1、option2、option3、option4为筛选条件
String input = "((option1&&option2)||(option3&&option4))";
//用正则表达式去掉逻辑运算符
String optionStr = input.replaceAll("[\\(\\)]", "").replaceAll("\\&&", ",").replaceAll("\\|\\|", ",");
System.out.println("option String: " + optionStr);
List<String> optionList = Arrays.asList(optionStr.split(","));
//条件最大值
int maxOption = 0;
for (String option : optionList) {
    int optionNum = Integer.parseInt(option.replace("option", ""));
    if (optionNum > maxOption) {
        maxOption = optionNum;
    }
}
System.out.println("option maxNum: " + maxOption);
System.out.println("option List: " + JSON.toJSONString(optionList));
//执行各个条件查询，将结果放到map中，key为条件条件，value为结果集合
int size = optionList.size();
Map<String, List<String>> map = new HashMap<>();
for (int i = 0; i < size; i++) {
    List<String> list = new ArrayList<>();
    for (int j = 0; j <= i; j++) {
        list.add("empi-" + (j + 1));
    }
    map.put(optionList.get(i), list);
}
System.out.println("option and result map: " + JSON.toJSONString(map));

/**
 * 正则表达式匹配，求出最小运算单元结果集，并替换
 * ((option1&&option2)||(option3&&option4))
 * -->(option5||(option3&&option4))
 * -->(option5||option6)
 * -->option7  最终结果
 */
Pattern r = Pattern.compile("\\(option[0-9]&&option[0-9]\\)|\\(option[0-9]\\|\\|option[0-9]\\)");
Pattern r1 = Pattern.compile("option[0-9]");
Matcher m = r.matcher(input);

while (m.find()) {
    String temp = m.group();
    System.out.println(temp);
    Matcher m1 = r1.matcher(temp);
    m1.find();
    String option1 = m1.group();
    m1.find();
    String option2 = m1.group();
    System.out.println(option1 + "--" + option2);
    maxOption++;

    List list1 = map.get(option1);
    List list2 = map.get(option2);
    if (temp.contains("&&")) {
        list1.retainAll(list2);
    } else {
        list1.removeAll(list2);
        list1.addAll(list2);
    }
    map.put("option" + maxOption, list1);
    input = input.replace(temp, "option" + maxOption);
    System.out.println("input: " + input);
    m = r.matcher(input);
}
System.out.println("option and result map: " + JSON.toJSONString(map));