/**
    * 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;
  
  /**
   * 
   * 获取数据
   * @author zhangxj-a
   * @since jdk1.6
   * @date 2013-5-20
   *  
   */
  public  class ObtainData  extends MetadataSupportStrategy{
  
  	private static MetadataSupportStrategy instance = new ObtainData();
  
  	private  ObtainData() {
  		super();
  	}
  
  	public  Object getMetadata(String metadataType, String invokeMethod, BaseActionSupport action) {
  		logger.info("执行 [{}] 方法，数据类型 [{}]，使用的策略类 [{}]", invokeMethod, metadataType, getClass().getName());
  		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();
  		
  		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;
  			}
  		}
  		
  		try {
  			metadataObj = getMetadataFromResource(invokeMethod, action);
  		} catch (MetadataException e) {
  			metadataObj = new JSONObject();
  		}
  		decorateWithData(calledInvokedMethod, metadataObj, invokeMethod, action, returned);
  
  		if (returned != null) {
  			logger.debug(returned.toString());
  		}
  		return returned;
  	}
  
  	/**
  	 * @return 获取单例
  	 */
  	public static  MetadataSupportStrategy getInstance() {
  		return instance;
  	}
  
  }