package Book.c12;

//: c12:DirList.java
// Displays directory listing using regular expressions.
// {Args: "D.*\.java"}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.io.*;
import java.util.*;
import java.util.regex.*;
import com.bruceeckel.util.*;

public class DirList {
  public static void main(String[] args) {
    File path = new File("Book/c12");
     String[] list;
     String aa="^\w$";
    if(aa.length() == 0)
    {
      list = path.list();
      
    }
    else
      list = path.list(new DirFilter(aa));
    Arrays.sort(list, new AlphabeticComparator());
    for(int i = 0; i < list.length; i++)
      System.out.println(list[i]);
  }
}

class DirFilter implements FilenameFilter {
  private Pattern pattern;
  public DirFilter(String regex) {
    pattern = Pattern.compile(regex);
  }
  public boolean accept(File dir, String name) {
    // Strip path information, search for regex:
    return pattern.matcher(
      new File(name).getName()).matches();
  }
} ///:~