import java.io.*;
public class Linking
{
	// ************************************************************
  	// *														  *
	// *                       main Method      				  *
	// *														  *
	// ************************************************************
	public static void main(String[] args) throws Exception
	{
		System.out.println("\n * * * Welcome to the Program  * * * \n");
/*CALL*/readFile();
		System.out.println("\n * * * End of the Linking * * * \n");
	}
 	// ************************************************************
	// *														  *
	// *                    readFile Method     				  *
	// *														  *
    // ************************************************************
	public static void readFile()
	{
		String firstLineSt="";
		String secondLineSt="";
		
		try // Read the INPUT FILE
		{
			FileReader inputFileReader = new FileReader("Num.txt"); 
			BufferedReader inputFileBuffer = new BufferedReader(inputFileReader);
			firstLineSt=inputFileBuffer.readLine(); 
			secondLineSt=inputFileBuffer.readLine();
			System.out.println(firstLineSt);
			System.out.println(secondLineSt);
			writeFile(firstLineSt,secondLineSt);
			firstLineSt=secondLineSt;
			while(true) // Until the end of the input file
			{
				secondLineSt=inputFileBuffer.readLine();
				if(firstLineSt==null) // End of the input file
				{
					break;
				}
				System.out.println(firstLineSt);
				System.out.println(secondLineSt);
				writeFile(firstLineSt,secondLineSt);
				firstLineSt=secondLineSt;
			} // End of the WHILE loop (End of the file)
			inputFileReader.close();
		} // End of the TRY
		catch(FileNotFoundException e)
		{
			System.out.println("Unable to Open INPUT File");
		}
		catch(IOException e)
		{
			System.out.println("Unable to Close INPUT File");
		}
	}
    // ************************************************************
	// *														  *
	// *                    writeFile Method     			 	  *
	// *														  *
    // ************************************************************
	public static void writeFile(String tempSt1,String tempSt2)
	{
		char backslash=92;
		String umlword="UML";
		String firstPartPath=umlword+backslash;
		String filePath1="";
		String filePath2="";
		
		filePath1=firstPartPath.concat(tempSt1).concat(".html");
		filePath2=firstPartPath.concat(tempSt2).concat(".html");
//		System.out.println(filePath1);
//		System.out.println(filePath2);
		tempSt1=(char)10+"<td style="+(char)34+"border-color:black"+(char)34+
			" "+"align="+(char)34+"center"+(char)34+"><a href="+(char)34+
			tempSt1+".html"+(char)34+"><span style="+(char)34+
			"clear:none; font-weight:bold; position:relative; right:auto; "+
			(char)34+">Previous</span></a></td>";
		tempSt2=(char)10+"<td style="+(char)34+"border-color:black"+(char)34+
			" "+"align="+(char)34+"center"+(char)34+"><a href="+(char)34+
			tempSt2+".html"+(char)34+"><span style="+(char)34+
			"clear:none; font-weight:bold; position:relative; right:auto; "+
			(char)34+">Next</span></a></td>";
		replaceStringInFile(filePath2, "XPrevious", tempSt1);
		replaceStringInFile(filePath1, "XNext", tempSt2);
	}
    // ************************************************************
	// *														  *
	// *                replaceStringInFile Method  		 	  *
	// *														  *
    // ************************************************************
	public static void replaceStringInFile(String filePath, String match, String replacingString)
	{
		try 
		{
			RandomAccessFile raf = new RandomAccessFile(filePath, "rw");
			long pointer = raf.getFilePointer();
			String lineData = "";
			while((lineData =raf.readLine()) != null)
			{
				pointer = raf.getFilePointer() - lineData.length()-2;
				if(lineData.indexOf(match) > 0)
				{
					System.out.println("Changing string in file "+filePath);
					raf.seek(pointer);
					raf.writeBytes(replacingString); 
//					if the replacingString has less number of characters than the matching string line then enter blank spaces.
					if(replacingString.length() < lineData.length())
					{
						int difference = (lineData.length() - replacingString.length())+1;
						for(int i=0; i < difference; i++)
						{
							raf.writeBytes(" ");
						}
					} 
				}
			}
		} 
		catch (FileNotFoundException ex) 
		{
			ex.printStackTrace();
		} 
		catch (IOException ex) 
		{
			ex.printStackTrace();
		} 
		catch(Exception ex)
		{
			ex.printStackTrace();
		}
	}
    // ************************************************************
	// ************************************************************
	// ********************End Of the Program**********************
	// ************************************************************
    // ************************************************************
}