FileIterator.java

package org.wikijava.recursion;
 
import java.io.*;
 
/**
 * @author Alex Mutuku Mbolonzi
 * @version 01/07/08
 */
public class IsDirectory implements java.io.FileFilter {
 
    /**
     * accept the pathname and search for diretories. return true if a directory
     * is found
     */
    public boolean accept(File f) {
	return f.isDirectory();
    }
}

package org.apache.commons.jci.examples.commandline;
 
import java.io.*;
 
/**
 * @author Alex Mutuku Mbolonzi
 * @version 01/07/08
 */
public class IsNotDirectory implements java.io.FileFilter {
    /*
     *  return true if a file is found
     */
    public boolean accept(File f) {
	return f.isFile();
    }
}

package org.wikijava.recursion;
 
import java.io.*;
 
/**
 * @author Alex Mutuku Mbolonzi
 * @version 30/06/08
 */
public class FileIterator {
    // stores the number of files in each directory.
    int countFiles = 0;
 
    // stores the size of each directory.
    int dirSize = 0;
 
    // declare a string.
    static String p = "";
 
    static String fileName;
 
    /**
     * prints out contents in each diretory.
     * 
     * @param folder
     */
    public void printContents(File folder) {
 
	// creates an array of directorys objects
	File[] directorys = folder.listFiles(new IsDirectory());
 
	// print out all objects in the array.
	for (int i = 0; i < directorys.length; i++) {
 
	    // get the name of each directory and print.
	    System.out.print(directorys[i].getName() + " ");
 
	    // print contents of directory.
	    printContents(directorys[i]);
	}
 
	// creates an array of files objects
	File[] files = folder.listFiles(new IsNotDirectory());
 
	// loops through the array
	for (int z = 0; z < files.length; z++) {
	    // get the size of each file.
	    files[z].length();
	    // count the files in a directory
	    countFiles = z;
	    // sum the size of all files in a diectory
	    dirSize += files[z].length();
	}
 
	// print out the number of files and size of directory.
	System.out.println("[ " + (countFiles + 1) + " files]"
		+ "[ Directory Size " + (dirSize / 10526760) + " MB ]");
 
	// prints out all objects in the array.
	for (int k = 0; k < files.length; k++) {
 
	    // get the name and size of each file and print
	    System.out.println("\t" + files[k].getName() + "  [ "
		    + files[k].length() + " bytes ]");
	}
 
	System.out.println();
 
    }
 
    public static void main(String[] args) throws IOException {
 
	try {
 
	    // declare a new BufferedReader object.
	    BufferedReader printFiles = new BufferedReader(
		    new InputStreamReader(System.in));
 
	    // prompt user to enter thier preference.
	    System.out.print("Would you like to print "
		    + "out files and directories (Y/N)? ");
 
	    // convert input to upper case.
	    p = printFiles.readLine().toUpperCase();
	    // creates a new object of the pathname.
	    File rootFolder = new File("D:/music");
	    // creates a new FileIterator Object.
	    FileIterator fi = new FileIterator();
	    // print contents of root folder.
	    fi.printContents(rootFolder);
 
	    if (p == null) {
 
		throw new IOException("string p is null");
	    }
	}
 
	catch (IOException e) {
 
	    System.out.println("You have not specified wether the "
		    + "program should print files and "
		    + "directories or just directories!");
	}
    }
}