import javax.swing.filechooser.*;
import java.io.File;

public class SimpleFileFilter extends FileFilter {
    String[] extensions;
    String description;
    
    public SimpleFileFilter(String ext) {
	this (new String[] {ext}, null);
    }
    
    public SimpleFileFilter(String[] exts, String descr) {
	// clone and lowercase the extensions
	extensions = new String[exts.length];
	for (int i = exts.length - 1; i >= 0; i--) {
	    extensions[i] = exts[i].toLowerCase();
	}
	// make sure we have a valid (if simplistic) description
	description = (descr == null ? exts[0] + " files" : descr);
    }
    
    public boolean accept(File f) {
	// we always allow directories, regardless of their extension
	if (f.isDirectory()) { return true; }
	
	// ok, it's a regular file so check the extension
	String name = f.getName().toLowerCase();
	for (int i = extensions.length - 1; i >= 0; i--) {
	    if (name.endsWith(extensions[i])) {
		return true;
	    }
	}
	return false;
    }
    
    public String getDescription() { 
	return description; 
    }
}