如何在JSNI中实例化java类

Question

我试图使用JSO的package-private的::new()方法在JSNI方法体中实例化一个java类型，但所有实例都作为空句柄返回。怎么会这样?

是否可以使用类似于Java的语法来实例化该类？

相关代码如下：

public class OnChangeHandlerJso extends JavaScriptObject {

    protected OnChangeHandlerJso() {};

    public static native JavaScriptObject create() /*-{

        return function(cm, changeInfo) {

            var eventBus = @com.gigaspaces.codemirror_gwt.client.events.EventUtils::CODE_MIRROR_EVENT_BUS;

            var event = @com.gigaspaces.codemirror_gwt.client.events.EditorContentChangeEvent::new()();

            // could something like this work?
            // var event = new @com.gigaspaces.codemirror_gwt.client.events.EditorContentChangeEvent;

            event.@com.gigaspaces.codemirror_gwt.client.events.EditorContentChangeEvent::setCm(Lcom/gigaspaces/codemirror_gwt/client/jsni/CodeMirrorJso;)(cm);
            event.@com.gigaspaces.codemirror_gwt.client.events.EditorContentChangeEvent::setChangeInfo(Lcom/gigaspaces/codemirror_gwt/client/jsni/ChangeInfoJso;)(changeInfo);
            eventBus.@com.google.gwt.event.shared.EventBus::fireEvent(Lcom/google/gwt/event/shared/GwtEvent;)(event);
        };
    }-*/;
}

Answer 1

解决方法如下：

覆盖类型

public class OnChangeHandlerJso extends JavaScriptObject {

    protected OnChangeHandlerJso() {};

    public static native OnChangeHandlerJso create() /*-{
        return function(cm, changeInfo) {
            @com.gigaspaces.codemirror_gwt.client.vo.OnChangeHandler::handle(Lcom/gigaspaces/codemirror_gwt/client/jsni/CodeMirrorJso;Lcom/gigaspaces/codemirror_gwt/client/jsni/ChangeInfoJso;)(cm, changeInfo);
        };
    }-*/;
}

操作者

public class OnChangeHandler implements JsoWrapper<OnChangeHandlerJso> {

    public static void handle(CodeMirrorJso cmJso, ChangeInfoJso changeInfoJso) {
        // ...
        EventUtils.CODE_MIRROR_EVENT_BUS.fireEvent(new EditorContentChangeEvent(cm, changeInfo));
    }
}