/*
 * [PNGFileFilter.java]
 *
 * Summary: Creates a file filter that accepts only *.png files.
 *
 * Copyright: (c) 2004-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.8 2009-04-04 Mask, command line version of Masker.
 */
package com.mindprod.masker;

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

/**
 * Creates a file filter that accepts only *.png files.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.8 2009-04-04 Mask, command line version of Masker.
 * @since 2004-05-19
 */
final class PNGFileFilter extends FileFilter
    {
    /**
     * Creates a file filter that accepts only *.png files.
     */
    public PNGFileFilter()
        {
        }

    /**
     * Return true if this file should be shown in the directory pane, false if it shouldn't. accepts directories and
     * .PNG files.
     *
     * @param f file/directory to test
     *
     * @return true if this
     * @see java.io.FileFilter#accept(File)
     */
    public boolean accept( File f )
        {
        if ( f != null )
            {
            if ( f.isDirectory() )
                {
                return true;
                }
            String name = f.getName().toLowerCase();
            return name.endsWith( ".png" );
            }
        else
            {
            return false;
            }
        }

    /**
     * Returns the human readable description of this filter.
     *
     * @return description of what this filter produces
     */
    public String getDescription()
        {
        return "*.png image files";
        }
    }