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Share on Google+import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Vector;
public class Groupingclass {
public void prepareGroupBy(Vector<Integer> vec,String delimeter) {
BufferedReader readoldfile = null;
//BufferedWriter bufferFileWriter = null;
try{
String sCurrentLine;
// Groped file name (Suresh.txt)
readoldfile = new BufferedReader(new FileReader("D:\\suresh.txt"));
int count =0;
while ((sCurrentLine = readoldfile.readLine()) != null) {
if(count ==0){
groupByDataWriteToFile(sCurrentLine+delimeter+"1","first",vec ,delimeter);
}
else {
if(sCurrentLine !=null && sCurrentLine.toString().trim().length()>0)
{
/*Hashtable<String,Object> resultHash =*/ groupByDataWriteToFile(sCurrentLine+delimeter+"1","same",vec,delimeter);
/*
if(resultHash!=null && resultHash.size()>0) {
Boolean status = (Boolean) resultHash.get("isexist");
if(!status){
groupByDataWriteToFile(sCurrentLine+delimeter+"1","unique",vec,delimeter );
}
}*/
}
}
count++;
}
} catch(Exception ex){
//File file = new File("D:\\groupby.txt");
System.out.println("Exception>>>????????????????"+ex);
}
finally {
try {
readoldfile.close();
//bufferFileWriter.close();
}catch(IOException io){}
}
}
public Hashtable<String,Object > groupByDataWriteToFile(String oldCurrentLine,String unique,Vector<Integer> vec,String delimeter) throws IOException
{
Hashtable<String,Object> resultHash = new Hashtable<String,Object>();
BufferedReader br = null;
BufferedWriter bufferFileWriter = null;
boolean isexist = false;
File path = new File("D:\\groupBy.txt");
int countR=0;
try {
String sCurrentLine;
String writepath = "D:\\groupBy.txt";
File file = new File(writepath);
bufferFileWriter = new BufferedWriter(new FileWriter(file,true));
if(path.exists()) {
br = new BufferedReader(new FileReader(path));
}
else {
File gfile = new File("D:\\groupBy.txt");
br = new BufferedReader(new FileReader(gfile));
}
if(unique !=null && unique.equals("first")) {
// System.out.println("firs+++++tline :"+oldCurrentLine);
bufferFileWriter.write(oldCurrentLine);
bufferFileWriter.newLine();
bufferFileWriter.flush();
isexist = true;
resultHash.put("isexist",true);
//resultHash.put("currentRow",oldCurrentLine);
return resultHash;
}
else {
while ((sCurrentLine = br.readLine()) != null) {
//read from start original file
String arry[] = sCurrentLine.split(delimeter);
// it take row by row from original file
String oldarry[] =oldCurrentLine.split(delimeter);
boolean groupBycolumnsCheckFlag = checkGroupByColumns(vec,arry,oldarry);
// if row is same true
if(groupBycolumnsCheckFlag) {
String cnt= arry[(arry.length-1)];
countR =Integer.parseInt(cnt);
countR = countR+1;
arry[(arry.length-1)] =countR+"";
String finalStr = UpdateSameRowWithCount(vec,oldarry,arry);
// System.out.println("finalStr :"+finalStr);
bufferFileWriter.write(finalStr);
bufferFileWriter.newLine();
bufferFileWriter.flush();
isexist = true;
resultHash.put("isexist",true);
resultHash.put("currentRow",sCurrentLine);
closeConnections(br,bufferFileWriter);
if(path.exists()) {
temFileCreate(new BufferedReader(new FileReader("D:\\groupBy.txt")),oldCurrentLine,countR,vec,delimeter);
}
else {
File gfile = new File("D:\\groupBy.txt");
temFileCreate(new BufferedReader(new FileReader(gfile)),oldCurrentLine,countR,vec,delimeter);
}
resultHash.put("isexist",true);
resultHash.put("currentRow",sCurrentLine);
return resultHash;
}
else if(!sCurrentLine.equals(oldCurrentLine)) {
resultHash.put("isexist",isexist);
resultHash.put("currentRow",sCurrentLine);
}
}
}
// System.out.println("not same :"+oldCurrentLine);
if(file.exists()) {
bufferFileWriter.write(oldCurrentLine);
bufferFileWriter.newLine();
bufferFileWriter.flush();
resultHash.put("isexist",true);
resultHash.put("currentRow",oldCurrentLine);
}
else{
File file1 = new File("D:\\groupBy.txt");
bufferFileWriter = new BufferedWriter(new FileWriter(file1,true));
bufferFileWriter.write(oldCurrentLine);
bufferFileWriter.newLine();
bufferFileWriter.flush();
resultHash.put("isexist",true);
resultHash.put("currentRow",oldCurrentLine);
}
return resultHash;
} catch (IOException e) {
/*System.out.println("Exception-----------------"+e);
e.printStackTrace();*/
// File file2 = new File("D:\\groupBy.txt");
// bufferFileWriter = new BufferedWriter(new FileWriter(file2,true));
return resultHash;
} finally {
closeConnections(br,bufferFileWriter);
}
}
public void temFileCreate(BufferedReader br,String currentLine,int count,Vector<Integer> vec,String delimeter)throws IOException
{
BufferedWriter bufferFileWritertemp1=null;
bufferFileWritertemp1 = new BufferedWriter(new FileWriter("D:\\groupBytemp.txt"));
String[] arry=currentLine.split(delimeter);
String currenline1="";
String[] oldarry=null;
while((currenline1=br.readLine())!=null)
{
oldarry=currenline1.split(delimeter);
boolean groupBycolumnsCheckFlag = checkGroupByColumns(vec,arry,oldarry);
//if((arry[0].equals(oldarry[0]))&&(arry[1].equals(oldarry[1]))&&(arry[2].equals(oldarry[2]))&&(arry[3].equals(oldarry[3]))&&(arry[4].equals(oldarry[4]))&&(count==Integer.parseInt(oldarry[oldarry.length-1])))
if(groupBycolumnsCheckFlag&&(count==Integer.parseInt(oldarry[oldarry.length-1])))
{
bufferFileWritertemp1.write(currenline1);
//System.out.println("tempfile line :"+currenline1);
bufferFileWritertemp1.write("\n");
}
//else if(!((arry[0].equals(oldarry[0]))&&(arry[1].equals(oldarry[1]))&&(arry[2].equals(oldarry[2]))&&(arry[3].equals(oldarry[3]))&&(arry[4].equals(oldarry[4]))))
else if(!groupBycolumnsCheckFlag)
{
//System.out.println("temp file not equal :"+currenline1);
bufferFileWritertemp1.write(currenline1);
bufferFileWritertemp1.write("\n");
}
}
closeConnections(br,bufferFileWritertemp1);
/*br = null;
bufferFileWritertemp1 = null;*/
File newfile1 =new File("D:\\groupBy.txt");
if(newfile1.delete()) {
//System.out.println(newfile1.getName() + " is deleted!");
} else {
//System.out.println(newfile1.getName() +"Delete operation is failed.");
}
File oldfile =new File("D:\\groupBytemp.txt");
File newfile =new File("D:\\groupBy.txt");
if(oldfile.renameTo(newfile)){
System.out.println("success -->");
//System.gc();
}
else {
File newfile2 =new File("D:\\groupBy.txt");
if(oldfile.renameTo(newfile2)){
System.out.println("???????????????success -->");
}
}
}
public void closeConnections(BufferedReader br,BufferedWriter bw)
{
try {
if(br!=null)
{
try {
br.close();
br = null;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(bw!=null)
{
bw.close();
bw = null;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String UpdateSameRowWithCount(Vector<Integer> vec,String[] oldarry,String[] arry) {
String updatedString = "";
for(int index = 0;index<vec.size();index++) {
updatedString += oldarry[vec.get(index)]+",";
}
if(arry!=null && arry.length>0)
updatedString += arry[(arry.length-1)];
return updatedString;
}
public boolean checkGroupByColumns(Vector<Integer> vec,String[] currentRowArray,String[] checkRowArray) {
boolean checkFlag = true;
for(int index = 0;index<vec.size();index++) {
if(!currentRowArray[index].toString().trim().equals(checkRowArray[index].toString().trim())){
checkFlag = false;
return checkFlag; // when index is not matched
}
}
return checkFlag;
}
public static void main(String[] args) {
Groupingclass groupby = new Groupingclass();
Vector<Integer> vec = new Vector<Integer>();
vec.add(0);
vec.add(1);
vec.add(2);
vec.add(3);
vec.add(4);
String delimeter=",";
System.out.println("call prepareGroupBy method");
groupby.prepareGroupBy(vec,delimeter);
}
}
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