Gwt - 如何将叠加层(JavaScriptObject) "cast"转换为真正的 Java 对象？

Question

在我的 GWT 项目中，我确实需要在多个叠加层(JavaScriptObject)之间实现相同的接口(interface)。

根据文档:

Starting with GWT 2.0, it is permissible for JavaScriptObject subtypes to implement interfaces. Every method defined in an interface may map to at most one method declared in a JavaScriptObject subtype. Practically speaking, this means that only one JavaScriptObject type may implement any given interface, but any number of non-JavaScriptObject types may also implement that interface.

所以，我想将我的 JavaScriptObject“转换”为一个真正的 Java 对象。它使我可以大大减少大量重复代码。

是否可以 ？
谢谢。

Answer 1

如何创建包装 JSO 而不是继承它的类？

public class PersonJso extends JavaScriptObject{
    protected PersonJso() {}
    public static native PersonJso create(String name) /*-{
        return {name : name};
    }-*/;
    public final native String getName() /*-{
        return this.name;
    }-*/;
}

public class AnimalJso extends JavaScriptObject{
    protected AnimalJso() {}
    public static native PersonJso create(String name) /*-{
        return {name : name};
    }-*/;
    public final native String getName() /*-{
        return this.name;
    }-*/;
}
public class AnimalWrapper implements hasName{
    AnimalJso jso;
    public AnimalWrapper(){}
    public AnimalWrapper(AnimalJso jso){
        this.jso = jso;
    }
    @Override
    public String getName() {
        return jso.getName();
    }
}
public class PersonWrapper implements hasName{
    PersonJso jso;  
    public PersonWrapper(){}
    public PersonWrapper(PersonJso jso){
        this.jso = jso;
    }
    @Override
    public String getName() {
        return jso.getName();
    }   
}