File Filters

[cipro]

I am trying to write a file filter that will sort all files in a directory according to file size. I have looked through the books and searched the net but I haven't been able to find anything clear enough to help.

If someone could help me I would really appreciate it.

Thanks.

 

[dsanchez2]

Look at the following class: java.io.File

This class has methods to obtain a list of files in a directory, and to obtain the file size.

 

[hologram]

You don't need a "FileFilter".
What you can try is : create your own "FileSystemView" (extend FileSystemView) and override method

File[] getFiles(File dir, boolean useFileHiding)

so that it returns the files sorted by filesize. And then for set the FileSystemView for your JFileChooser to your FileSystemView :

chooser.setFileSystemView(yourFileSystemView);

I said try, I do not know whether it will work, or that you have to override additional methods.

 

[cipro]

Thanks for the suggestion ... I will give that one a try and let you know how it goes.

 

[cipro]

I had a look at the FileSystemView and I still cnt find anything to do with file size. If anyone has any other ideas or advice I would really appreciate it.

Thanks

 

[greeneka]

If you're using a JFileChooser you'd have to implement it differently (like hologram said above) but if you just need to sort files you could try this:

import java.io.*;
import java.util.*;

public class ListFilesInSizeOrder{

	private static File[] files;

	public static void main(String[] args){
		if(args.length == 0){
			System.out.println("please enter a directory");
			return;
		}
		listFiles(args[0]);
	}

	public static void listFiles(String directory){
		
		File f = new File(directory);
		if(!f.exists()){
			System.out.println(directory+" doesn't exist");
			return;
		}
		
		if(!f.isDirectory()){
			System.out.println(directory+" is not a valid directory");
			return;
		}
				
		files = f.listFiles();
		Arrays.sort(files, 
			new Comparator(){
				public int compare(Object o1, Object o2){
					File f1 = (File)o1, f2 = (File)o2;
					if(f1.isDirectory()){
						if(f2.isDirectory()){
							return 0;
						}
						return -1;
					}
					if(f2.isDirectory()){
						return 1;
					}
					return (int)(f1.length() - f2.length());
				}

				public boolean equals(Object obj){
					return true;
				}
			}
		);	
		printFiles();
	}

	public static void printFiles(){
		for(int i = 0; i < files.length; i++){ 
			if(files[i].isDirectory()){
				System.out.println(files[i].getName()+&quot; - DIRECTORY&quot;);
			}else{
				System.out.println(files[i].getName()+&quot; - &quot;+files[i].length());
			}
		}
	}
}

 

[hologram]

You can use Greeneka's code to implement

File[] getFiles(File dir, boolean useFileHiding)