1.6（设计模式）过滤器模式

import java.util.List;

public interface Criteria {
    public List<Person> meetCriteria(List<Person> persons);//过滤出符合某种标准的结果集
}

import java.util.ArrayList;
import java.util.List;

public class ManCriteria implements Criteria{
    
    @Override
    public List<Person> meetCriteria(List<Person> persons) {
        // TODO Auto-generated method stub
        List<Person> manList = new ArrayList<Person>();
        for(Person person:persons) {
            if("男".equals(person.getSex())) {
                manList.add(person);
            }
        }
        return manList;
    }
}

import java.util.ArrayList;
import java.util.List;

public class WomanCriteria implements Criteria{
    
    @Override
    public List<Person> meetCriteria(List<Person> persons) {
        // TODO Auto-generated method stub
        List<Person> womanList = new ArrayList<Person>();
        for(Person person:persons) {
            if("女".equals(person.getSex())) {
                womanList.add(person);
            }
        }
        return womanList;
    } 
}

import java.util.ArrayList;
import java.util.List;

public class MaritalCriteria implements Criteria{

    @Override
    public List<Person> meetCriteria(List<Person> persons) {
        List<Person> maritalList = new ArrayList<Person>();
        for(Person person:persons) {
            if("Married".equals(person.getMaritalStatus())){
                maritalList.add(person);
            }
        }
        return maritalList;
    }
    
}

import java.util.List;

public class AndCriteria implements Criteria{
    private Criteria criteria;
    private Criteria othercriteria;
    
    public AndCriteria(Criteria criteria, Criteria othercriteria) {
        super();
        this.criteria = criteria;
        this.othercriteria = othercriteria;
    }

    @Override
    public List<Person> meetCriteria(List<Person> persons) {
        List<Person> firstCriteria = criteria.meetCriteria(persons);
        return othercriteria.meetCriteria(firstCriteria);
    }
}

import java.util.List;

public class OrCriteria implements Criteria{
    private Criteria criteria;
    private Criteria otherCriteria;
    public OrCriteria(Criteria criteria, Criteria otherCriteria) {
        super();
        this.criteria = criteria;
        this.otherCriteria = otherCriteria;
    }
    @Override
    public List<Person> meetCriteria(List<Person> persons) {
        List<Person> firstCriteriaItem = criteria.meetCriteria(persons);
        List<Person> otherCriteriaItem = otherCriteria.meetCriteria(persons);
        for(Person person:firstCriteriaItem) {
            if(!otherCriteriaItem.contains(person)) {//去掉两个结果集中重复部分，即将不包含的内容添加。
                otherCriteriaItem.add(person);
            }
        }
        return otherCriteriaItem;
    }
    
}

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
         List<Person> persons = new ArrayList<Person>();
         
         persons.add(new Person("Robert","男", "Single"));
         persons.add(new Person("John","女", "Married"));
         persons.add(new Person("Laura","女", "Married"));
         persons.add(new Person("Diana","女", "Single"));
         persons.add(new Person("Mike","男", "Single"));
         persons.add(new Person("Bobby","男", "Single"));
         
         Criteria manCriteria = new ManCriteria();
         out(manCriteria.meetCriteria(persons));//筛选出性别为男的对象
         Criteria womanCriteria = new WomanCriteria();
         out(womanCriteria.meetCriteria(persons));//筛选出性别为女的对象
         Criteria maritalCriteria = new MaritalCriteria();
         out(maritalCriteria.meetCriteria(persons));//筛选出已婚对象
         Criteria manAndMarital = new AndCriteria(manCriteria, maritalCriteria);//筛选出男性且已婚的对象
         out(manAndMarital.meetCriteria(persons));
         
    }
    
    public static void out(List<Person> persons) {
        for(Person person:persons) {
            System.out.println(person);
        }
        System.out.println();
    }
}