Insert numbers starting with one in each xml files sequentially

Question

The following is a sample of two of my xml files
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article SYSTEM "abc.dtd">
<article xyz>
<front>
<product>
<citation citation-type="book" id="">
</citation>
</product>
<product>
<citation citation-type="book" id="">
</citation>
</product>
</front>
</article>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article SYSTEM "abc.dtd">
<article xyz>
<front>
<product>
<citation citation-type="book" id="">
</citation>
</product>
<product>
<citation citation-type="book" id="">
</citation>
</product>
<product>
<citation citation-type="book" id="">
</citation>
</product>
<product>
<citation citation-type="book" id="">
</citation>
</product>
</front>
</article>
This is my source code
public class ReadTexFile
     public void Go2Directory(String Directory)
                File scan = new File(Directory);
          String DirList[] = scan.list();
          try
               for(int i = 0; i < DirList.length; i++)
                    File ChkDir = new File((new StringBuilder()).append(scan.getPath()).append("\\").append(DirList).toString());
                    if(ChkDir.isFile())
                         dum1 = ChkDir.toString().toUpperCase();
                         if(dum1.lastIndexOf(".XML") > 0)
String ExecFile = ChkDir.toString();
                              File TexfileName = new File(ExecFile);
                              ReadFileContent(TexfileName);
                              fileCount++;
                         if(!ChkDir.exists())
                              System.out.println((new StringBuilder()).append("NO FILES FOUND IN THE DIRECTORY").append(scan).toString());
          catch(Exception e)
               System.out.println((new StringBuilder()).append("The Error Is in ").append(e).toString());
     public void ReadFileContent(File TexFile)
try
               BufferedReader br = new BufferedReader(new FileReader(TexFile));
               String fetchline = "";
               for(String line = ""; (line = br.readLine()) != null;)
                    fetchline = (new StringBuilder()).append(fetchline).append(line).append("00000000").toString();
               br.close();
cntr=1;
               fetchline = RemoveIfAlreadyExist(fetchline);
               fetchline = fetchline.replace("00000000", "\n");
               File tmp = new File(TexFile.getParent(), "XmlFileTmp.xml");
               BufferedWriter bw = new BufferedWriter(new FileWriter(tmp));
               bw.write(fetchline);
               bw.flush();
               bw.close();
               File org = new File(TexFile.getAbsolutePath());
               System.gc();
               tmp.renameTo(org);
          catch(IOException ioe)
               System.out.println((new StringBuilder()).append("The IO Exception occured because ").append(ioe.getMessage()).toString());
          catch(NullPointerException npe)
               System.out.println((new StringBuilder()).append("The Null Pointer Exception occured because ").append(npe.getMessage()).toString());
     public String RemoveIfAlreadyExist(String line)
String res = "";
int cc=1;
          Pattern Regex = Pattern.compile("<product>00000000<citation citation-type=\".*?\" id=\"\">");
          for(Matcher RegexMatcher = Regex.matcher(line); RegexMatcher.find();)
               String chkEntity = RegexMatcher.group();
               String subchkEntity1=chkEntity.substring(0,chkEntity.lastIndexOf("\">"));
               String s1 = Integer.toString(cc);
               if(s1.length()==1)
                    res = line.replace(subchkEntity1,subchkEntity1+"ref00"+cc+"");
               if(s1.length()==2)
                    res = line.replace(subchkEntity1,subchkEntity1+"ref0"+cc+"");
               if(s1.length()==3)
                    res = line.replace(subchkEntity1,subchkEntity1+"ref"+cc+"");
cc++;
          return res;
My output from my code is
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article SYSTEM "abc.dtd">
<article xyz>
<front>
<product>
<citation citation-type="book" id="ref002">
</citation>
</product>
<product>
<citation citation-type="book" id="ref002">
</citation>
</product>
</front>
</article>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article SYSTEM "abc.dtd">
<article xyz>
<front>
<product>
<citation citation-type="book" id="ref004">
</citation>
</product>
<product>
<citation citation-type="book" id="ref004">
</citation>
</product>
<product>
<citation citation-type="book" id="ref004">
</citation>
</product>
<product>
<citation citation-type="book" id="ref004">
</citation>
</product>
</front>
</article>
But I need my output as
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article SYSTEM "abc.dtd">
<article xyz>
<front>
<product>
<citation citation-type="book" id="ref001">
</citation>
</product>
<product>
<citation citation-type="book" id="ref002">
</citation>
</product>
</front>
</article>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article SYSTEM "abc.dtd">
<article xyz>
<front>
<product>
<citation citation-type="book" id="ref001">
</citation>
</product>
<product>
<citation citation-type="book" id="ref002">
</citation>
</product>
<product>
<citation citation-type="book" id="ref003">
</citation>
</product>
<product>
<citation citation-type="book" id="ref004">
</citation>
</product>
</front>
</article>Could anyone please tell me what modifications to do in my code.

Answer 1

Hi sony,
Since you are trying to replace the pattern of subchkEntity1,
it replaces all the lines which contain ("<citation citation-type="book" id=")
including(...id="refxxx...)
& not ("<citation citation-type="book" id="") alone.
So ,to eliminate this, we have to match the string with chkEntity &
replace only the first occurance.
I've modified the method RemoveIfAlreadyExist.
It works fine now.
public String RemoveIfAlreadyExist(String line)
         int cc=1;
          Pattern Regex = Pattern.compile("<product>00000000<citation citation-type=\".*?\" id=\"\">");
          for(Matcher RegexMatcher = Regex.matcher(line); RegexMatcher.find();)
               String chkEntity = RegexMatcher.group();
               int lastIndex = chkEntity.lastIndexOf("\">");
               String subchkEntity1=chkEntity.substring(0,lastIndex);
               String s1 = Integer.toString(cc);
               if(s1.length()==1)
                    line = line.replaceFirst(chkEntity,subchkEntity1+"ref00"+cc+"\"");
               if(s1.length()==2)
                    line = line.replaceFirst(chkEntity,subchkEntity1+"ref00"+cc+"\"");
               if(s1.length()==3)
                    line = line.replaceFirst(chkEntity,subchkEntity1+"ref00"+cc+"\"");
                        cc++;
          return line;
     }