ModelMapper场映射

Question

我在ModelMapper框架上遇到了麻烦。请解释一下为什么我看到下面的行为。

在build.gradle中有一个下面的依赖项

compile group: 'org.modelmapper', name: 'modelmapper', version: '2.0.0'

还有一位顾客：

public class Customer {

    private String name;
    private int age;

    public Customer() {
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                .add("name", name)
                .add("age", age)
                .toString();
    }
}

我还有个地图：

public class CustomerPropertyMap extends PropertyMap<Customer, Customer> {

    private final Condition<String, String> isFred = s -> isFred(s.getSource());

    @Override
    protected void configure() {
        when(isFred).map(source.getName()).setName("George");
        map(source.getAge(), destination.getAge());
    }

    boolean isFred(String s) {
        return "Fred".equals(s);
    }
}

和一次考验

public class PropertyMapTest {
    CustomerPropertyMap customerPropertyMap = new CustomerPropertyMap();
    ModelMapper modelMapper = new ModelMapper();

    @Before
    public void init() {
        modelMapper.addMappings(customerPropertyMap);
    }

    @Test
    public void fred() {
        Customer customer = new Customer();
        customer.setAge(40);
        customer.setName("Fred");
        Customer mapped = modelMapper.map(customer, Customer.class);
        System.out.println(mapped);
    }

    @Test
    public void nonFred() {
        Customer customer = new Customer();
        customer.setAge(40);
        customer.setName("Qwerty");
        Customer mapped = modelMapper.map(customer, Customer.class);
        System.out.println(mapped);
    }
}

在fred()方法输出中，nonFred("Customer{name=null，age=40}")中的“Customer{name=null，age=40}”是“Customer{name=null，age=40}”。你能解释一下为什么吗？为什么我没有在第一种方法中看到输出"George“？

Answer 1

当用于在源类型和目标类型之间的条件映射时

在您的情况下，只有在满足条件“Fred”.equals(名称)时才映射名称。