content: /*******************************************************************************
   * Copyright 2017 Bstek
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
   * use this file except in compliance with the License.  You may obtain a copy
   * of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations under
   * the License.
   ******************************************************************************/
  package com.bstek.ureport.console;
  
  import org.apache.commons.lang3.StringUtils;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.lang.reflect.Method;
  import java.net.URLDecoder;
  import java.util.Enumeration;
  import java.util.HashMap;
  import java.util.Map;
  
  
  /**
   * @author
   * @since 2016年6月3日
   */
  public abstract class BaseServletAction implements ServletAction {
  	protected Throwable buildRootException(Throwable throwable){
  		if(throwable.getCause()==null){
  			return throwable;
  		}
  		return buildRootException(throwable.getCause());
  	}
  
  	protected String decode(String value){
  		if(value==null){
  			return value;
  		}
  		try{
  			value=URLDecoder.decode(value, "utf-8");
  			value=URLDecoder.decode(value, "utf-8");
  			return value;
  		}catch(Exception ex){
  			return value;
  		}
  	}
  	protected String decodeContent(String content){
  		if(content==null){
  			return content;
  		}
  		try{
  			content=URLDecoder.decode(content, "utf-8");
  			return content;
  		}catch(Exception ex){
  			return content;
  		}
  	}
  
  	protected Map<String, Object> buildParameters(HttpServletRequest req) {
  		Map<String,Object> parameters=new HashMap<String,Object>();
  		Enumeration<?> enumeration=req.getParameterNames();
  		while(enumeration.hasMoreElements()){
  			Object obj=enumeration.nextElement();
  			if(obj==null){
  				continue;
  			}
  			String name=obj.toString();
  			String value=req.getParameter(name);
  			if(name==null || value==null || name.startsWith("_")){
  				continue;
  			}
  			parameters.put(name, decode(value));
  		}
  		return parameters;
  	}
  
  	protected void invokeMethod(String methodName,HttpServletRequest req,HttpServletResponse resp) throws ServletException{
  		try{
  			Method method=this.getClass().getMethod(methodName, new Class<?>[]{HttpServletRequest.class,HttpServletResponse.class});
  			method.invoke(this, new Object[]{req,resp});
  		}catch(Exception ex){
  			throw new ServletException(ex);
  		}
  	}
  
  	protected String retriveMethod(HttpServletRequest req) throws ServletException{
  		String path=req.getContextPath()+UReportServlet.URL;
  		String uri=req.getRequestURI();
  		String targetUrl=uri.substring(path.length());
  		int slashPos=targetUrl.indexOf("/",1);
  		if(slashPos>-1){
  			String methodName=targetUrl.substring(slashPos+1).trim();
  			return methodName.length()>0 ? methodName : null;
  		}
  		return null;
  	}
  
  	protected String buildDownloadFileName(String reportFileName,String fileName,String extName){
  		if(StringUtils.isNotBlank(fileName)){
  			fileName=decode(fileName);
  			if(!fileName.toLowerCase().endsWith(extName)){
  				fileName=fileName+extName;
  			}
  			return fileName;
  		}else{
  			int pos=reportFileName.indexOf(":");
  			if(pos>0){
  				reportFileName=reportFileName.substring(pos+1,reportFileName.length());
  			}
  			pos=reportFileName.toLowerCase().indexOf(".ureport.xml");
  			if(pos>0){
  				reportFileName=reportFileName.substring(0,pos);
  			}
  			return "ureport-"+reportFileName+extName;
  		}
  	}
  }
  