ExtensionFileFilter

Question

OK, I have looked everywhere for the ExtensionFileFilter that hundreds of pages SWEAR is in the SwingSet demo. The only SS demo I've found did NOT have the code for ExtensionFileFilter. Also, I do not seem do have a demo directory in my Java folder. I'm kinda new at this Java stuff, so what do I need to do to make one? I am trying to filter out files for use in an application.
Thanks!
Stephen

Answer 1

A simple FileFilter for you to deal with extensions.
* SimpleFileFilter.java
* Created on 7 August 2000, 10:53
package com.ecsi.util;
import javax.swing.filechooser.*;
import java.io.File;
/** SimpleFileFilter
* A starightforward extension-based example of a file filter.
public final class SimpleFileFilter extends FileFilter {
  private String[] extensions;
  private String description;
  private boolean acceptAll;
  /** Creates new SimpleFileFilter */
  public SimpleFileFilter(String ext) {
    this(new String[] {ext},null);
    acceptAll = false;
  /** Creates a new SimpleFileFilter with a description **/
  public SimpleFileFilter(String[] exts, String descr){
    // clone and lowercase the extensions
    acceptAll = false;
    extensions = new String[exts.length];
    for(int i = exts.length - 1;i>=0;i--){
      extensions[i] = exts.toLowerCase();
// make sure we have a valid (if simplistic) description
description = (descr == null ? exts[0] + " files" :descr);
/** used by JFileChooser or whoever to see what file to accept **/
public boolean accept(File f){
// ok, it's a regular file so check the extension
String name = f.getName().toLowerCase();
//System.err.println("filename="+name);
for(int i = extensions.length -1; i >=0;i--){
if(name.endsWith(extensions[i])){
return true;
if(acceptAll){
//remove the extension
System.err.println("in accept all");
int extPos = name.indexOf('.');
if(extPos !=-1)
name = name.substring(0, extPos-1);
f = new File(name);
System.err.println("name ="+name);
//append our extension to it
return true;
// we always allow directories, regardless of their extensions
if(f.isDirectory()){ return true;}
return false;
/** get the description **/
public String getDescription(){ return description;}