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譯者：smallclover
個(gè)人翻譯，水平有限，如有錯(cuò)誤歡迎指出，謝謝！

過濾模式或者標(biāo)準(zhǔn)模式能通過邏輯操作，開發(fā)者可以以松耦合的方式通過使用不同的標(biāo)準(zhǔn)和過濾鏈來過濾一組對象。這種類型的設(shè)計(jì)模式來源于結(jié)構(gòu)模式，它通過組合多種不同的標(biāo)準(zhǔn)來獲得單一的標(biāo)準(zhǔn)。

我們將創(chuàng)建一個(gè)Person對象以及Criteria接口。并且創(chuàng)建實(shí)現(xiàn)Criteria接口的具體類，這些具體類負(fù)責(zé)過濾Person對象列表。CriteriaPatternDemo，我們的demo類使用criteria對象基于不同的標(biāo)準(zhǔn)以及它們的組合來過濾Person對象列表

創(chuàng)建一個(gè)標(biāo)準(zhǔn)的應(yīng)用類
Person.java

public class Person {
    
   private String name;
   private String gender;
   private String maritalStatus;

   public Person(String name, String gender, String maritalStatus){
      this.name = name;
      this.gender = gender;
      this.maritalStatus = maritalStatus;        
   }

   public String getName() {
      return name;
   }
   public String getGender() {
      return gender;
   }
   public String getMaritalStatus() {
      return maritalStatus;
   }    
}

創(chuàng)建一個(gè)Criteria接口
Criteria.java

import java.util.List;

public interface Criteria {
   public List meetCriteria(List persons);
}

創(chuàng)建具體類實(shí)現(xiàn)Criteria接口

譯者注：
CriteriaMale類 根據(jù)Male標(biāo)準(zhǔn)過濾
CriteriaFemale類 根據(jù)Female標(biāo)準(zhǔn)過濾
CriteriaSingle類 根據(jù)Single標(biāo)準(zhǔn)過濾
AndCriteria類組合兩種標(biāo)準(zhǔn)criteria, otherCriteria，同時(shí)滿足兩個(gè)標(biāo)準(zhǔn)的Person對象會被過濾出來。
OrCriteria類組合兩種標(biāo)準(zhǔn)criteria, otherCriteria，滿足otherCriteria基礎(chǔ)之上，選擇性的滿足criteria標(biāo)準(zhǔn)，過濾Person對象

CriteriaMale.java

import java.util.ArrayList;
import java.util.List;
public class CriteriaMale implements Criteria {
   @Override
   public List meetCriteria(List persons) {
      List malePersons = new ArrayList(); 
      
      for (Person person : persons) {
         if(person.getGender().equalsIgnoreCase("MALE")){
            malePersons.add(person);
         }
      }
      return malePersons;
   }
}

CriteriaFemale.java

import java.util.ArrayList;
import java.util.List;
public class CriteriaFemale implements Criteria {
   @Override
   public List meetCriteria(List persons) {
      List femalePersons = new ArrayList(); 
      
      for (Person person : persons) {
         if(person.getGender().equalsIgnoreCase("FEMALE")){
            femalePersons.add(person);
         }
      }
      return femalePersons;
   }
}

CriteriaSingle.java

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

public class CriteriaSingle implements Criteria {

   @Override
   public List meetCriteria(List persons) {
      List single  -Persons = new ArrayList(); 
      
      for (Person person : persons) {
         if(person.getMaritalStatus().equalsIgnoreCase("SINGLE")){
            singlePersons.add(person);
         }
      }
      return singlePersons;
   }
}

AndCriteria.java

import java.util.List;

public class AndCriteria implements Criteria {

   private Criteria criteria;
   private Criteria otherCriteria;

   public AndCriteria(Criteria criteria, Criteria otherCriteria) {
      this.criteria = criteria;
      this.otherCriteria = otherCriteria; 
   }

   @Override
   public List meetCriteria(List persons) {
   
      List firstCriteriaPersons = criteria.meetCriteria(persons);        
      return otherCriteria.meetCriteria(firstCriteriaPersons);
   }
}

OrCriteria.java

import java.util.List;

public class OrCriteria implements Criteria {

   private Criteria criteria;
   private Criteria otherCriteria;

   public OrCriteria(Criteria criteria, Criteria otherCriteria) {
      this.criteria = criteria;
      this.otherCriteria = otherCriteria; 
   }

   @Override
   public List meetCriteria(List persons) {
      List firstCriteriaItems = criteria.meetCriteria(persons);
      List otherCriteriaItems = otherCriteria.meetCriteria(persons);

      for (Person person : otherCriteriaItems) {
         if(!firstCriteriaItems.contains(person)){
            firstCriteriaItems.add(person);
         }
      }    
      return firstCriteriaItems;
   }
}

使用不同的標(biāo)準(zhǔn)以及它們的組合來篩選對象
CriteriaPatternDemo.java

public class CriteriaPatternDemo {
   public static void main(String[] args) {
      List persons = new ArrayList();

      persons.add(new Person("Robert","Male", "Single"));
      persons.add(new Person("John", "Male", "Married"));
      persons.add(new Person("Laura", "Female", "Married"));
      persons.add(new Person("Diana", "Female", "Single"));
      persons.add(new Person("Mike", "Male", "Single"));
      persons.add(new Person("Bobby", "Male", "Single"));

      Criteria male = new CriteriaMale();
      Criteria female = new CriteriaFemale();
      Criteria single = new CriteriaSingle();
      Criteria singleMale = new AndCriteria(single, male);
      Criteria singleOrFemale = new OrCriteria(single, female);

      System.out.println("Males: ");
      printPersons(male.meetCriteria(persons));

      System.out.println("
Females: ");
      printPersons(female.meetCriteria(persons));

      System.out.println("
Single Males: ");
      printPersons(singleMale.meetCriteria(persons));

      System.out.println("
Single Or Females: ");
      printPersons(singleOrFemale.meetCriteria(persons));
   }

   public static void printPersons(List persons){
   
      for (Person person : persons) {
         System.out.println("Person : [ Name : " + person.getName() + ", Gender : " + person.getGender() + ", Marital Status : " + person.getMaritalStatus() + " ]");
      }
   }      
}

確認(rèn)輸出

Males: 
Person : [ Name : Robert, Gender : Male, Marital Status : Single ]
Person : [ Name : John, Gender : Male, Marital Status : Married ]
Person : [ Name : Mike, Gender : Male, Marital Status : Single ]
Person : [ Name : Bobby, Gender : Male, Marital Status : Single ]

Females: 
Person : [ Name : Laura, Gender : Female, Marital Status : Married ]
Person : [ Name : Diana, Gender : Female, Marital Status : Single ]

Single Males: 
Person : [ Name : Robert, Gender : Male, Marital Status : Single ]
Person : [ Name : Mike, Gender : Male, Marital Status : Single ]
Person : [ Name : Bobby, Gender : Male, Marital Status : Single ]

Single Or Females: 
Person : [ Name : Robert, Gender : Male, Marital Status : Single ]
Person : [ Name : Diana, Gender : Female, Marital Status : Single ]
Person : [ Name : Mike, Gender : Male, Marital Status : Single ]
Person : [ Name : Bobby, Gender : Male, Marital Status : Single ]
Person : [ Name : Laura, Gender : Female, Marital Status : Married ]

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