我想根据另一个对象列表（Conditions）对对象列表（Promotions）进行分组。
Condition.java

class Promotion {
    String promoId;
    String promoDesc;
    String promoCode;
    Criteria criteria;
    
    public Promotion(String promoId, String promoDesc, String promoCode, Criteria criteria) {
        super();
        this.promoId = promoId;
        this.promoDesc = promoDesc;
        this.promoCode = promoCode;
        this.criteria = criteria;
    }
}

Criteria.java

class Criteria {

    String name;
    List<Condition> conditions;
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<Condition> getConditions() {
        return conditions;
    }
    public void setConditions(List<Condition> condition) {
        this.conditions = condition;
    }
}

Condition.java是

class Condition {

    String attribute;
    String operator;
    String value;
    
    public Condition(String attribute, String operator, String value) {
        super();
        this.attribute = attribute;
        this.operator = operator;
        this.value = value;
    }
}

这里是GroupingTest.java

public class GroupingTest {

public static void (String[] args) {
        
        Condition cond1 = new Condition("term", "equals", "24");
        Condition cond2 = new Condition("term", "not equals", "12");
        
        Condition cond3 = new Condition("handset", "equals", "ABC");
        Condition cond4 = new Condition("handset", "equals", "XYZ");
        
        // ABC handset with term 24
        Criteria c1 = new Criteria();
        c1.setName("ABCwith24");        
        c1.setConditions(Arrays.asList(cond1,cond3));
        
        // XYZ handset with term 12
        Criteria c2 = new Criteria();
        c2.setName("XYZwith12");        
        c2.setConditions(Arrays.asList(cond2,cond4));
        
        // ABC handset with term 24
        Criteria c3 = new Criteria();
        c3.setName("handset24");        
        c3.setConditions(Arrays.asList(cond1,cond3));
        
        // XYZ handset with term 12
        Criteria c4 = new Criteria();
        c4.setName("handset12");        
        c4.setConditions(Arrays.asList(cond2,cond4));
        
        // XYZ handset with term 12
        Criteria c5 = new Criteria();
        c5.setName("XYZ24");        
        c5.setConditions(Arrays.asList(cond1,cond4));
        
        
        // new Promotion( promoId,promoDesc, promoCode, criteria)
        Promotion promo1 = new Promotion("P1", "Promo1", "ABC24", c1);
        Promotion promo2 = new Promotion("P2", "Promo2", "XYZ12", c2);
        Promotion promo3 = new Promotion("P3", "Promo3", "AAA24", c3);      
        Promotion promo4 = new Promotion("P4", "Promo4", "BBB12", c4);
        Promotion promo5 = new Promotion("P5", "Promo5", "CCC12", c5);
        
        List<Promotion> promos = Arrays.asList(promo1,promo2,promo3,promo4,promo5);
        
    //TODO grouping
        
    }

而预期的结果是：

Grp1 with promo1, promo3 (since conditions are matching though the criteria is different objects (c1, c3).
 Grp2 with promo2, promo4 ( conditions  of c2, c4 are same)
 Grp3 with promo5

有没有一种方法可以在java8中使用Collectors.groupingBy（）或者其他的变通方法？请注意，所有的对象都是第三方提供的;所以不能访问代码库