package eu.fbk.knowledgestore.populator.naf;
   
   import java.io.BufferedWriter;
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.FileOutputStream;
   import java.io.IOException;
   import java.io.InputStream;
   import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.Writer;
  
  import javax.xml.bind.JAXBException;
  
  public class groupTxtF {
  	static OutputStream out;
  	/**
  	 * @param args
  	 * @throws IOException 
  	 * @throws JAXBException 
  	 * @throws ClassNotFoundException 
  	 * @throws SecurityException 
  	 * @throws NoSuchMethodException 
  	 * @throws IllegalAccessException 
  	 * @throws InstantiationException 
  	 */
  	public static void main(String[] args) throws InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, ClassNotFoundException, JAXBException, IOException {
  		
  		analyzePathAndRunSystem(args[0]);
  	}
  	private static void analyzePathAndRunSystem(String path) throws JAXBException, IOException, InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, ClassNotFoundException {
  		File filePath = new File(path);
  		if(filePath.exists()&&filePath.isDirectory()){
  			//create report file in the same directory of running the system
  			  out = new FileOutputStream(new File(filePath.getPath(), "groupedReport.txt"));
  
  			 File[] listOfFiles = filePath.listFiles(); 
  			  for (int i = 0; i < listOfFiles.length; i++) 
  			  {
  				 // System.out.println(listOfFiles[i].getName());
  			   if (listOfFiles[i].isFile()&&listOfFiles[i].getName().endsWith(".txt")) 
  			   {
  				 System.err.println(i+"="+listOfFiles[i].getName());
  			   //out.append("\n"+i+"="+listOfFiles[i].getName()+"\n");
  				 copyFile(listOfFiles[i]);
  			   }
  			   out.flush();
  			   System.gc();
  			   Runtime.getRuntime().gc();
  			  }
  			  out.flush();
  			  out.close();
  		}else if(filePath.exists()&&filePath.isFile()) {
  			System.err.println("It isn't efficient to group one file in one file");
  		}
  		out.flush();
  		out.close();
  	}
  	 static void copyFile(File source) {
  	        if (source == null || !source.exists())
  	            return;
  	        try{
  
  	            InputStream inStream = new FileInputStream(source);
  
  	            byte[] buffer = new byte[1024];
  
  	            int length;
  	            while ((length = inStream.read(buffer)) > 0) {
  	                out.write(buffer, 0, length);
  	            }
  
  	            inStream.close();
  	            out.flush();
  	            //System.out.println("File copied into " + target);
  	        }catch(IOException e) {
  	            e.printStackTrace();
  	        }
  	    }
  
  }