重庆网站建设重庆零臻科技价,百度旗下有哪些app,wordpress小工具选项,网站建设搭配文章目录 过滤器模式实现 过滤器模式实现javarustjavarust rust代码仓库 过滤器模式
过滤器模式#xff08;Filter Pattern#xff09;或标准模式#xff08;Criteria Pattern#xff09;是一种设计模式#xff0c;这种模式允许开发人员使用不同的标准来过滤一组对象Filter Pattern或标准模式Criteria Pattern是一种设计模式这种模式允许开发人员使用不同的标准来过滤一组对象通过逻辑运算以解耦的方式把它们连接起来。这种类型的设计模式属于结构型模式它结合多个标准来获得单一标准。
实现
我们将创建一个 Person 对象、Criteria 接口和实现了该接口的实体类来过滤 Person 对象的列表。CriteriaPatternDemo 类使用 Criteria 对象基于各种标准和它们的结合来过滤 Person 对象的列表。 我们制作一个Person实体类Criteria为标准条件CriteriaMale等为实现的具体判断器是需要为person类使用meetCriteria方法便可以进行不同条件的判断。 过滤器模式的 UML 图
过滤器模式
过滤器模式Filter Pattern或标准模式Criteria Pattern是一种设计模式这种模式允许开发人员使用不同的标准来过滤一组对象通过逻辑运算以解耦的方式把它们连接起来。这种类型的设计模式属于结构型模式它结合多个标准来获得单一标准。
实现
我们将创建一个 Person 对象、Criteria 接口和实现了该接口的实体类来过滤 Person 对象的列表。CriteriaPatternDemo 类使用 Criteria 对象基于各种标准和它们的结合来过滤 Person 对象的列表。 我们制作一个Person实体类Criteria为标准条件CriteriaMale等为实现的具体判断器是需要为person类使用meetCriteria方法便可以进行不同条件的判断。 过滤器模式的 UML 图
java
步骤 1 创建一个类在该类上应用标准。
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;}
}步骤 2 为标准Criteria创建一个接口。
Criteria.java
import java.util.List;public interface Criteria {public ListPerson meetCriteria(ListPerson persons);
}步骤 3 创建实现了 Criteria 接口的实体类。
CriteriaMale.java
import java.util.ArrayList;
import java.util.List;public class CriteriaMale implements Criteria {Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson malePersons new ArrayListPerson(); 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 {Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson femalePersons new ArrayListPerson(); 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 {Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson singlePersons new ArrayListPerson(); 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; }Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson 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; }Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson firstCriteriaItems criteria.meetCriteria(persons);ListPerson otherCriteriaItems otherCriteria.meetCriteria(persons);for (Person person : otherCriteriaItems) {if(!firstCriteriaItems.contains(person)){firstCriteriaItems.add(person);}} return firstCriteriaItems;}
}步骤4 使用不同的标准Criteria和它们的结合来过滤 Person 对象的列表。 CriteriaPatternDemo.java
import java.util.ArrayList;
import java.util.List;public class CriteriaPatternDemo {public static void main(String[] args) {ListPerson persons new ArrayListPerson();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(\nFemales: );printPersons(female.meetCriteria(persons));System.out.println(\nSingle Males: );printPersons(singleMale.meetCriteria(persons));System.out.println(\nSingle Or Females: );printPersons(singleOrFemale.meetCriteria(persons));}public static void printPersons(ListPerson persons){for (Person person : persons) {System.out.println(Person : [ Name : person.getName() , Gender : person.getGender() , Marital Status : person.getMaritalStatus() ]);}}
}步骤 5 执行程序输出结果
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 ]rust
由于时间关系并没有实现or条件大家有兴趣可以自行补充
// 设置人类实体类
#[derive(Clone)]
struct Person{name:String,gender:String,marital_status:String
}
impl Person {fn get_gender(self)-str {self.gender.as_ref()}fn get_marital_status(self)-str {self.marital_status.as_ref()}
}
// 设置过滤标准特征
trait Criteria {fn meet_criteria(self,persons:VecPerson)-VecPerson;
}
// 设置男性
struct CriteriaMale{}
// 重写男性评判标准
impl Criteria for CriteriaMale {fn meet_criteria(self,persons:VecPerson)-VecPerson{persons.into_iter().filter(|x| x.get_gender().eq_ignore_ascii_case(MALE)).collect()}
}
// 设置女性
struct CriteriaFemale{}
// 设置女性标准
impl Criteria for CriteriaFemale{fn meet_criteria(self,persons:VecPerson)-VecPerson{persons.into_iter().filter(|x| x.get_gender().eq_ignore_ascii_case(FEMALE)).collect()}
}
// 设置单身标准
struct CriteriaSingle{}impl Criteria for CriteriaSingle{fn meet_criteria(self,persons:VecPerson)-VecPerson{persons.into_iter().filter(|x| x.get_marital_status().eq_ignore_ascii_case(SINGLE)).collect()}
}
// 设置and标准求交集
struct AndCriteria {criteria:Boxdyn Criteria,other_criteria:Boxdyn Criteria
}impl Criteria for AndCriteria {fn meet_criteria(self,persons:VecPerson)-VecPerson {self.other_criteria.meet_criteria(self.criteria.meet_criteria(persons))}
}
// struct OrCriteria {
// criteria:Boxdyn Criteria,
// other_criteria:Boxdyn Criteria
// }// impl Criteria for OrCriteria{
// fn meet_criteria(self,persons:VecPerson)-VecPerson {
// let mut first_criteria_items self.criteria.meet_criteria(persons);
// let other_criteria_items self.other_criteria.meet_criteria(persons);
// for o in other_criteria_items {
// if !other_criteria_items.contains(o) {
// first_criteria_items.push(o);
// }
// }
// first_criteria_items// }
// }
fn print_persons(persons:VecPerson) {persons.into_iter().for_each(|x| println!(Person : [NAME: {},Gender : {} ,Maeital Status : {} ],x.name,x.gender,x.marital_status));
}
fn main() {let mut personsVec::new();persons.push(Person{name:String::from(Robert),gender:String::from(Male),marital_status:String::from(Single)});persons.push(Person{name:String::from(John),gender:String::from(Male),marital_status:String::from(Married)});persons.push(Person{name:String::from(Laura),gender:String::from(Female),marital_status:String::from(Married)});persons.push(Person{name:String::from(Diana),gender:String::from(Female),marital_status:String::from(Single)});let maleBox::new(CriteriaMale{});let femaleBox::new(CriteriaFemale{});let single_maleAndCriteria{criteria:Box::new(CriteriaSingle{}),other_criteria:Box::new(CriteriaMale{})};// let single_or_femaleOrCriteria{criteria:Box::new(CriteriaMale{}),other_criteria:Box::new(CriteriaFemale{})};println!(男士);print_persons(male.meet_criteria(persons.clone()));println!(女士);print_persons(female.meet_criteria(persons.clone()));println!(单身男士);print_persons(single_male.meet_criteria(persons))}java
步骤 1 创建一个类在该类上应用标准。
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;}
}步骤 2 为标准Criteria创建一个接口。
Criteria.java
import java.util.List;public interface Criteria {public ListPerson meetCriteria(ListPerson persons);
}步骤 3 创建实现了 Criteria 接口的实体类。
CriteriaMale.java
import java.util.ArrayList;
import java.util.List;public class CriteriaMale implements Criteria {Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson malePersons new ArrayListPerson(); 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 {Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson femalePersons new ArrayListPerson(); 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 {Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson singlePersons new ArrayListPerson(); 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; }Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson 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; }Overridepublic ListPerson meetCriteria(ListPerson persons) {ListPerson firstCriteriaItems criteria.meetCriteria(persons);ListPerson otherCriteriaItems otherCriteria.meetCriteria(persons);for (Person person : otherCriteriaItems) {if(!firstCriteriaItems.contains(person)){firstCriteriaItems.add(person);}} return firstCriteriaItems;}
}步骤4 使用不同的标准Criteria和它们的结合来过滤 Person 对象的列表。 CriteriaPatternDemo.java
import java.util.ArrayList;
import java.util.List;public class CriteriaPatternDemo {public static void main(String[] args) {ListPerson persons new ArrayListPerson();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(\nFemales: );printPersons(female.meetCriteria(persons));System.out.println(\nSingle Males: );printPersons(singleMale.meetCriteria(persons));System.out.println(\nSingle Or Females: );printPersons(singleOrFemale.meetCriteria(persons));}public static void printPersons(ListPerson persons){for (Person person : persons) {System.out.println(Person : [ Name : person.getName() , Gender : person.getGender() , Marital Status : person.getMaritalStatus() ]);}}
}步骤 5 执行程序输出结果
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 ]rust
由于时间关系并没有实现or条件大家有兴趣可以自行补充
// 设置人类实体类
#[derive(Clone)]
struct Person{name:String,gender:String,marital_status:String
}
impl Person {fn get_gender(self)-str {self.gender.as_ref()}fn get_marital_status(self)-str {self.marital_status.as_ref()}
}
// 设置过滤标准特征
trait Criteria {fn meet_criteria(self,persons:VecPerson)-VecPerson;
}
// 设置男性
struct CriteriaMale{}
// 重写男性评判标准
impl Criteria for CriteriaMale {fn meet_criteria(self,persons:VecPerson)-VecPerson{persons.into_iter().filter(|x| x.get_gender().eq_ignore_ascii_case(MALE)).collect()}
}
// 设置女性
struct CriteriaFemale{}
// 设置女性标准
impl Criteria for CriteriaFemale{fn meet_criteria(self,persons:VecPerson)-VecPerson{persons.into_iter().filter(|x| x.get_gender().eq_ignore_ascii_case(FEMALE)).collect()}
}
// 设置单身标准
struct CriteriaSingle{}impl Criteria for CriteriaSingle{fn meet_criteria(self,persons:VecPerson)-VecPerson{persons.into_iter().filter(|x| x.get_marital_status().eq_ignore_ascii_case(SINGLE)).collect()}
}
// 设置and标准求交集
struct AndCriteria {criteria:Boxdyn Criteria,other_criteria:Boxdyn Criteria
}impl Criteria for AndCriteria {fn meet_criteria(self,persons:VecPerson)-VecPerson {self.other_criteria.meet_criteria(self.criteria.meet_criteria(persons))}
}
// struct OrCriteria {
// criteria:Boxdyn Criteria,
// other_criteria:Boxdyn Criteria
// }// impl Criteria for OrCriteria{
// fn meet_criteria(self,persons:VecPerson)-VecPerson {
// let mut first_criteria_items self.criteria.meet_criteria(persons);
// let other_criteria_items self.other_criteria.meet_criteria(persons);
// for o in other_criteria_items {
// if !other_criteria_items.contains(o) {
// first_criteria_items.push(o);
// }
// }
// first_criteria_items// }
// }
fn print_persons(persons:VecPerson) {persons.into_iter().for_each(|x| println!(Person : [NAME: {},Gender : {} ,Maeital Status : {} ],x.name,x.gender,x.marital_status));
}
fn main() {let mut personsVec::new();persons.push(Person{name:String::from(Robert),gender:String::from(Male),marital_status:String::from(Single)});persons.push(Person{name:String::from(John),gender:String::from(Male),marital_status:String::from(Married)});persons.push(Person{name:String::from(Laura),gender:String::from(Female),marital_status:String::from(Married)});persons.push(Person{name:String::from(Diana),gender:String::from(Female),marital_status:String::from(Single)});let maleBox::new(CriteriaMale{});let femaleBox::new(CriteriaFemale{});let single_maleAndCriteria{criteria:Box::new(CriteriaSingle{}),other_criteria:Box::new(CriteriaMale{})};// let single_or_femaleOrCriteria{criteria:Box::new(CriteriaMale{}),other_criteria:Box::new(CriteriaFemale{})};println!(男士);print_persons(male.meet_criteria(persons.clone()));println!(女士);print_persons(female.meet_criteria(persons.clone()));println!(单身男士);print_persons(single_male.meet_criteria(persons))}rust代码仓库
https://github.com/onenewcode/design.git 本教程项目在bin文件夹下的filtert.rs文件中
