/**
    * Copyright By Grandsoft Company Limited.  
    * 2013-8-10 上午09:03:57
    */
   package gboat2.base.core.web.md;
   
   import gboat2.base.bridge.debug.DefaultDebugHook;
   import gboat2.base.core.web.BaseActionSupport;
   
  import java.net.URL;
  import java.util.List;
  
  import net.sf.json.JSONObject;
  
  import org.apache.commons.lang3.StringUtils;
  import org.osgi.framework.Bundle;
  import org.osgi.framework.FrameworkUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * 
   * 元数据处理基类
   * @author lysming
   * @since jdk1.6
   * @date 2013-8-10
   *  
   */
  
  public class MetadataSupport {
  	
  	private static Logger logger = LoggerFactory.getLogger(MetadataSupport.class);
  	
  	private static URL getFileURL(String invokeMethod, BaseActionSupport action) {
  		Bundle bundle = FrameworkUtil.getBundle(action.getClass());
  		List<IFileFilter> filters = MetadataHandlerChain.getFileFilters();
  		String filePath;
  		//由各IFileFilter去检查各文件规则的文件是否存在，优先级依据MetadataHandlerChain中的初始化顺序
  		URL url = null;
  		for (IFileFilter handler : filters) {
  			filePath = handler.getFile(invokeMethod, action, bundle);
  			if (!StringUtils.isEmpty(filePath) && (url=DefaultDebugHook.getInstance().findResource(bundle, filePath)) != null) {
  				logger.debug("find file with FileFilter[" + handler.getClass().getSimpleName() + "] : " + filePath);
  				return url;
  			}
  		}
  		return null;
  	}
  
  	public static JSONObject parseMetadata(String invokeMethod, BaseActionSupport action) {
  		Bundle bundle = FrameworkUtil.getBundle(action.getClass());
  		URL url = getFileURL(invokeMethod, action);
  		MetadataHandlerChain chain = MetadataHandlerChain.getHandlerChain(action, invokeMethod);
  		if (url != null) {
  			return parseMetadata(url, bundle, chain);
  		}
  		
  		return null;
  	}
  	
  	public static JSONObject parseMetadata(URL url, Bundle bundle, MetadataHandlerChain chain) {
  		JSONObject object = null;
  		if (url != null) {
  			object = chain.getHandler().parseMetadata(object, url, bundle, chain);
  		}
  		
  		return object;
  	}
  }