Inverted File Filter : FileFilter « File « Java Tutorial

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import java.io.File;
import java.io.FilenameFilter;

/**
 * This takes a <code>FilenameFilter<code> as input and inverts the selection.
 * This is used in retrieving files that are not accepted by a filter.
 *
 * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
 * @version CVS $Revision: 494012 $ $Date: 2007-01-08 11:23:58 +0100 (Mo, 08 Jan 2007) $
 * @since 4.0
 */
public class InvertedFileFilter
    implements FilenameFilter
{
    private final FilenameFilter m_originalFilter;

    public InvertedFileFilter( final FilenameFilter originalFilter )
    {
        m_originalFilter = originalFilter;
    }

    public boolean accept( final File file, final String name )
    {
        return !m_originalFilter.accept( file, name );
    }
}