Adressbook/src/main/java/at/ionas999/adressbook/repository/AddressBook.java

package at.ionas999.adressbook.repository;

import at.ionas999.adressbook.models.Contact;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;

public class AddressBook {
    private static AddressBook instance;
    private ObservableList<Contact> list;

    private AddressBook() {
        list = FXCollections.observableArrayList();
    }

    public static AddressBook getInstance() {
        if (AddressBook.instance == null) {
            AddressBook.instance = new AddressBook();
        }
        return instance;
    }

    public ObservableList<Contact> getContacts() {
        return FXCollections.unmodifiableObservableList(list);
    }

    public void addContact(Contact contact) {
        list.add(contact);
    }

    public void removeContact(Contact contact) {
        list.remove(contact);
    }

    public SimpleIntegerProperty getAmount() {
        SimpleIntegerProperty amount = new SimpleIntegerProperty();
        amount.bind(javafx.beans.binding.Bindings.size(list));
        return amount;
    }
}