JFileFilter.java

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

/** A simple FileFilter class that works by filename extension,
 * like the one in the JDK demo called ExtentionFilter, which
 * has been announced to be supported in a future Swing release.
 */
class JFileFilter extends javax.swing.filechooser.FileFilter {
	protected String description;
	protected ArrayList exts = new ArrayList();
	
	public void addType(String s) 
	{
		exts.add(s);
	}
	
	/** Return true if the given file is accepted by this filter. */
	public boolean accept(File f) {
		// Little trick: if you don't do this, only directory names
		// ending in one of the extensions appear in the window.
		if (f.isDirectory( )) {
			return true;
		} else if (f.isFile( )) {
			Iterator it = exts.iterator( );
			while (it.hasNext( )) {
				if (f.getName().endsWith((String)it.next( )))
					return true;
			}
		}
		// A file that didn't match, or a weirdo (e.g. UNIX device file?).
		return false;
	}
	
	/** Set the printable description of this filter. */
	public void setDescription(String s) 
	{
		description = s; 
	}
	
	/** Return the printable description of this filter. */
	public String getDescription( ) 
	{
		return description;
	}
}