[Spring] Factory Pattern

Coding again the interface.

 

interface:

package com.frankmoley.lil.designpatternsapp.factory;

public interface Pet {
    void setName(String name);
    String getName();
    String getType();
    boolean isHungry();
    void feed();
}

 

Factory:

package com.frankmoley.lil.designpatternsapp.factory;

import org.springframework.stereotype.Component;

@Component
public class PetFactory {
    public Pet createPet(String animalType){
        switch(animalType.toLowerCase()){
            case "dog":
                return new Dog();
            case "cat":
                return new Cat();
            default:
                throw new UnsupportedOperationException("unknown animal type");
        }
    }
}

@Component added to tell this class should be managed by Spring, so later we can use @Autowired.

 

Class implements the interface:

package com.frankmoley.lil.designpatternsapp.factory;

public class Cat implements Pet {
    private String name;
    private boolean hungry;

    public Cat(){
        super();
        this.hungry = true;
    }

    @Override
    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String getName() {
        return this.name;
    }

    @Override
    public String getType() {
        return "CAT";
    }

    @Override
    public boolean isHungry() {
        return this.hungry;
    }

    @Override
    public void feed() {
        this.hungry = false;
    }
}

 

Controller:

@RestController
@RequestMapping("/")
public class AppController {
    @Autowired
    private PetFactory petFactory;

    @GetMapping
    public String getDefault(){
        return "{\"message\": \"Hello World\"}";
    }

    @PostMapping("adoptPet/{type}/{name}")
    public Pet adoptPet(@PathVariable String type, @PathVariable String name){
        Pet pet = this.petFactory.createPet(type);
        pet.setName(name);
        pet.feed();
        return pet;
    }

}