/**
    * Copyright By Grandsoft Company Limited.  
    * 2012-2-16 下午03:34:12
    */
   package gboat2.base.core.web;
   
   import java.lang.reflect.Method;
   
   import net.sf.json.JSONObject;
  
  import org.springframework.util.ReflectionUtils;
  
  /**
   * 
   * 获取元数据
   * @author zhangxj-a
   * @since jdk1.6
   * @date 2013-5-20
   *  
   */
  public  class ObtainMetadata  extends MetadataSupportStrategy{
  	
  	private static MetadataSupportStrategy instance = new ObtainMetadata();
  	
  	private ObtainMetadata() {
  		super();
  	}
  
  	public Object getMetadata(String metadataType, String invokeMethod, BaseActionSupport action) {
  		logger.info("Current Strategy:{}",this.getClass().getName());
  		logger.info("get metadata type : " + metadataType + ", invoke : " + invokeMethod);
  		JSONObject metadataObj;
  
  		//以下分2次分别依次获取：md元数据文件内容、数据
  		boolean calledInvokedMethod = false;
  		JSONObject returned = new JSONObject();
  		//获取metadata需要先调用initXXXX方法,如果不存在initXXXX方法，调用请求XXXX方法
  		if (!callInitInvokedMethod(invokeMethod, action)) {
  			Method method = ReflectionUtils.findMethod(action.getClass(), invokeMethod);
  			if (method != null) {
  				try {
  					ReflectionUtils.invokeMethod(method, action);
  					calledInvokedMethod = true;
  				} catch (Exception e) {
  					e.printStackTrace();
  				}
  			}else{
  				//方法不存在，默认作为调用成功
  				calledInvokedMethod = true;
  			}
  		}
  
  		metadataObj = getMetadataFromResource(invokeMethod, action);
  
  		//失败直接返回到客户端
  		if (metadataObj.containsKey("success") && metadataObj.getBoolean("success") == false) {
  			returned = metadataObj;
  		} else if (metadataObj.get("component").equals("iframe")) {//是iframe页面直接返回客户端
  			returned.accumulate("metadata", metadataObj);
  		} else {
  			metadataObj = decorateMetadata(metadataObj, invokeMethod, action);
  			returned.accumulate("metadata", metadataObj);
  			//在获取metadata时即时返回data
  			/**此处将calledInvokeMethod传入true，说明其已经调用过了，不在需要第二次调用 */
  			decorateWithData(calledInvokedMethod, metadataObj, invokeMethod, action, returned);
  		}
  		return returned;
  
  	} 
  
  	public static MetadataSupportStrategy getInstance() {
  		return instance;
  	}
  }