如何使用推土机将简单的ArrayList映射到VO

Question

I'm using Dozer to convert my objects. But I've a problem to map a simple List... I retrieve a ResultSet from Hibernate as an Object List and I want to map it to my complex type object.

So, my source is like :

List < Object > list = new ArrayList< Object > ();
list.add("Name");
list.add("Address");

And my Value Object is :

public class MyClass 
{ 
    public String name; 
    public String address; 
}

I just want to map list[0] ==> MyClass.name and list[1] ==> MyClass.address properties but I don't find how...

Thanks for your help !

Answer 1

For some reason Dozer does Not support this (the ideal situation):

<mapping>
    <class-a>MyClass</class-a>
    <class-b>java.util.List</class-b>       
    <field>          
        <a is-accessible="true">name</a>
        <b>this[0]</b>
    </field>        
</mapping>

It would only map to name the whole string representation of the List , so your name property would end up with the value [Name, Address] .

Your best option would be to put your List in a holder class and map it like this:

<mapping>
    <class-a>MyClass</class-a>
    <class-b>MyHolder</class-b>     
    <field>          
        <a is-accessible="true">name</a>
        <b>holded[0]</b>
    </field>
    <field>          
        <a is-accessible="true">address</a>
        <b>holded[1]</b>
    </field>    
</mapping>

MyHolder class just contains your List instance in the holded field and provide access to it with a getter method.

In the field mappings is-accessible="true" is required because MyClass properties are public and have no accessors. I recommend you to make those properties private and create accessor methods.