dps123456789
dps123456789
2019-07-13 17:21
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已采纳

验证构造函数中的参数

I'm developing a library management system, and basically I have an abstract class "Reader" that extends to "students, teachers and people in general". My question is, I have a class "Requests" and I need to know which "Reader" request the book, to be able to validate this data:

"teachers can only request 10 books simultaneously, the students can only request 5 books in simultaneously and the public in general can oly request 2 books in simultaneously;"

"teachers can keep each book at maximum for 6 months, students for 5 days, and the general public for 1 month;"

"if a teacher has a book for more than three months and there is a need to request it, the teacher must be notified to return the book;"

How can I pass the three type of "Readers" in the __construct, to validate the above data.

class Requests
{
    protected $bookRequested;
    protected $teacher;
    protected $student;
    protected $public;
    protected $requestDate;
    protected $returnDate;

    public function __construct(Book $bookRequested, Teacher $teacher, Student $student, GeneralPublic $public)
    {
        $this->bookRequested = $bookRequested;
        $this->teacher = $teacher;
        $this->student = $student;
        $this->public = $public;
        $this->requestDate = date('Y-m-d H:i:s');
        $this->returnDate = date('Y-m-d H:i:s');
    }
}
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2条回答 默认 最新

  • douang1243
    douang1243 2019-07-13 17:40
    已采纳

    I'm not sure why you need all three readers in same request, since only one of them is going to be involved in a given transaction. If you have this:

    abstract class Reader {}
    class Teacher extends Reader {}
    class Student extends Reader {}
    class GeneralPublic extends Reader {}
    

    ... then your constructor just needs one parameter, the base class:

    public function __construct(Book $bookRequested, Reader $reader) {}
    

    To configure stuff you can just create a property or method. If you opt for a method you get the plus of being able to make it abstract too:

    abstract class Reader
    { 
        abstract public function getMaxBooks();
    }
    
    class Teacher extends Reader
    {
        public function getMaxBooks() {
            return 10;
        }
    }
    
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  • douchiwan1503
    douchiwan1503 2019-07-13 17:43

    i hope if i can help with that you can check on class type when validate.

    class Reader{
        protected $requests;
        protected $name;
        public function get_name(){
            return $this->name;
        }
    }
    class Teacher extends Reader{
    
    }
    class Student extends Reader{
    
    }
     class GeneralPublic extends Reader{
    
     }
     class Book{
         protected $name;
         public function __construct($name){
            $this->name = $name;
         }
     }
    class Requests
    {
        protected $bookRequested;
        protected $reader;
        protected $requestDate;
        protected $returnDate;
    
        public function __construct(Book $bookRequested, Reader $reader)
        {
            $this->bookRequested = $bookRequested;
            $this->reader = $reader;
            $this->requestDate = date('Y-m-d H:i:s');
            $this->returnDate = date('Y-m-d H:i:s');
        }
        public function validate(){
            echo get_class($this->reader);
        }
    }
     $teacher = new Teacher();
     $student = new Student();
     $gen_pu = new GeneralPublic();
    
     $book = new Book("Travel");
     $req = new Requests($book,$teacher);
    $req->validate();
    
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