/**
    * Copyright By Grandsoft Company Limited.  
    * 2013-8-10 上午06:03:48
    */
   package gboat2.base.core.web.md;
   
   import gboat2.base.core.GBoatClassLoader;
   import gboat2.base.core.web.BaseActionSupport;
   
  import java.net.URL;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.List;
  
  import net.sf.json.JSONObject;
  
  import org.osgi.framework.Bundle;
  
  /**
   * 
   * 元数据文件处理责任链
   * @author lysming
   * @since jdk1.6
   * @date 2013-8-10
   *  
   */
  
  public class MetadataHandlerChain {
  
  	private static List<IFileFilter> fileFilters = new LinkedList<IFileFilter>();
  	private static List<MetadataHandler> handlers = new LinkedList<MetadataHandler>();
  	static {
  		//文件过滤器
  		fileFilters.add(new ExtendMethodHandler());
  		fileFilters.add(new MultiFileModelHandler());
  		fileFilters.add(new SingleFileModelHandler());
  		fileFilters.add(new IFrameHandler());
  		
  		//getMetadataFilePath采用正序
  		handlers.add(new DebugHandler());
  		handlers.add(new IFrameHandler());
  		handlers.add(new CacheHandler());
  		handlers.add(new DbConfigHandler());
  		handlers.add(new MultiFileModelHandler());
  		handlers.add(new SingleFileModelHandler());
  		handlers.add(new ExtendMetadataHandler());
  	}
  
  	private String filePath;
  
  	private Bundle bundle;
  
  	private BaseActionSupport action;
  
  	private String invokeMethod;
  	
  	private Iterator<MetadataHandler> it = handlers.iterator();
  	
  	public MetadataHandlerChain(BaseActionSupport action,String invokeMethod){
  		this.invokeMethod = invokeMethod;
  		this.action = action;
  	}
  
  	public static MetadataHandlerChain getHandlerChain(BaseActionSupport action,String invokeMethod) {
  		return new MetadataHandlerChain(action,invokeMethod);
  	}
  	
  	public MetadataHandler getHandler(){
  		return (MetadataHandler)it.next();
  	}
  
  	public JSONObject doHandler(JSONObject object,URL url,Bundle bundle) {
  		if(it.hasNext()){
  			return it.next().parseMetadata(object, url, bundle, this);
  		}
  		return object;
  	}
  	
  	public MetadataHandlerChain clone(MetadataHandlerChain chain){
  		return new MetadataHandlerChain(chain.getAction(),chain.getInvokeMethod());
  	}
  
  	public String getFilePath() {
  		return filePath;
  	}
  
  	public void setFilePath(String filePath) {
  		this.filePath = filePath;
  	}
  
  	public Bundle getBundle() {
  		if(bundle==null){
  			bundle = GBoatClassLoader.getInstance().getBundle(action.getClass().getPackage().getName());
  		}
  		return bundle;
  	}
  	
  	public BaseActionSupport getAction() {
  		return action;
 	}
 
 	public String getInvokeMethod() {
 		return invokeMethod;
 	}
 
 	public static List<MetadataHandler> getHandlers() {
 		return handlers;
 	}
 
 	public static List<IFileFilter> getFileFilters() {
 		return fileFilters;
 	}
 }