?????????1Hello World

下面是一个最简单的例子，我们将创建一个组件，并让它在APF的架构中产生输出。

package aurora.testcase.presentation;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import uncertain.composite.CompositeMap;
import aurora.presentation.BuildSession;
import aurora.presentation.IViewBuilder;
import aurora.presentation.PresentationManager;
import aurora.presentation.ViewComponent;
import aurora.presentation.ViewComponentPackage;
import aurora.presentation.ViewContext;
import aurora.presentation.ViewCreationException;

/**

* Basic view demo 
* @author Zhou Fan
*
*/


public class HelloWorld implements IViewBuilder{   

	
   /** 实现buildView方法，创建界面内容 */
   public void buildView( BuildSession session,  ViewContext view_context ) 
       throws IOException, ViewCreationException
   {
       // 从view中获取color属性
       CompositeMap view = view_context.getView();
       String color = view.getString("color");

       // 从model中获取需要显示的字段
       CompositeMap model = view_context.getModel();
       String field = view.getString("field");
       String greeting = model.getString(field);
        
       // 从BuildSession中获得用于输出的Writer
       Writer out = session.getWriter();
       out.write("Hello, " + greeting + "");
   }

   /** 此方法在本例中暂无须实现 */
   public String[] getBuildSteps( ViewContext context ){
       return null;        
   }
    
   public static void main(String[] args) throws Exception {
       /// 创建PresentationManager——界面组件的管理者
       PresentationManager pm = new PresentationManager();
       // 创建一个ViewComponent，将<hello>标记与HelloWorld类关联在一起
       ViewComponent component = new ViewComponent(null, "hello", HelloWorld.class);
       // ViewComponent通过ViewComponentPackage组织在一起
       ViewComponentPackage pkg = new ViewComponentPackage();
       pkg.addComponent(component);
       // 将刚刚创建的ViewComponentPackage注册到PresentationManager中
       pm.addPackage(pkg);
        
       // 创建包含数据的model，设置greeting属性
       CompositeMap model = new CompositeMap("data");
       model.put("greeting", "world");
       // 创建hello组件的配置，设置color属性
       CompositeMap view = new CompositeMap("hello");
       view.put("color", "red");
       view.put("field", "greeting");

       // 创建一个Writer实例，用于输出界面内容
       PrintWriter out = new PrintWriter(System.out);
        
       // 通过PresentationManager创建BuildSession，这是整个界面创建
       BuildSession session = pm.createSession( out );

       // 完成界面内容的创建
       session.buildView(model, view);
       out.flush();
        
   }
}

这个例子演示了APF的基本概念：

http://app.hand-china.com/download/aurora/APFDG1.1.jpg