Text Normalizer

TextNormalizer.java

/*
 *  Text Normalizer
 *  To remove all punctuation, extra spacing
 *  And transforming into lower case.
 */

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;


public class TextNormalizer {
    public void Process(String path) {
        BufferedReader br;
        BufferedWriter bw;
        File f = new File(
                path.substring(0, path.length() - 4) 
                + "-normalized" + path.substring(path.length() - 4)
                );
        
        /*
         * Handled by BufferedWriter and FileWriter
         * 
         * if (f.exists()) {
         *   f.delete();
         * }
         * 
         */

        try {
            br = new BufferedReader(new FileReader(path));
            bw = new BufferedWriter(new FileWriter(f));
            String line = null;
            while( (line = br.readLine()) != null) {
                bw.write(Normalizer(line) + "\n");
            }
            bw.flush();
            bw.close();
            br.close();
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        }
                
        
    }
    
    private String Normalizer(String str) {
    
        /*
         *  "[^(\\w|\\s)]" means to delete non word or non space-like char.
         *  I don't know why it does not equal to \\W\\S
         *  
         *  "\\s{2,}" means to extra space
         *  
         *  p.s. [^(\\w|\\s)]|(\\()|(\\))
         *  means to delete non word or non space-like char or ( or )
         *  
         *  p.s. [^a-zA-Z] =.=
         */
        
        return str.replaceAll("[^a-zA-Z]", " ").replaceAll("\\s{2,}", " ").toLowerCase();
    }
    
    public static void main(String[] args) {
        TextNormalizer tn = new TextNormalizer();
        tn.Process("data/ADanceWithDragons.txt");
    }
}