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/*
 * @(#)SimpleFileChooserFilter.java beta8   2006/04/23
 *
 * Copyright (C) 2008    Adam King
 *
 * This application is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This application is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this application; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


package org.midibox.utils.gui;

import java.io.File;
import java.util.Enumeration;
import java.util.Hashtable;

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

public class SimpleFileChooserFilter extends FileFilter {

    private Hashtable fileTypes;

    private String filterDescription;

    public SimpleFileChooserFilter(String filterDescription) {
        this.filterDescription = filterDescription;
        fileTypes = new Hashtable();
    }

    public SimpleFileChooserFilter(String filterDescription, String extension,
            String description) {
        this.filterDescription = filterDescription;
        fileTypes = new Hashtable();
        addFileType(extension, description);
    }

    public void addFileType(String extension, String description) {
        fileTypes.put(extension, description);
    }

    public boolean accept(File f) {
        if (f.isDirectory()) {
            return true;
        }

        String extension = getExtension(f);

        if (extension != null) {
            if (fileTypes.containsKey(extension)) {
                return true;
            } else {
                return false;
            }
        }
        return false;
    }

    public String getDescription() {

        String description = filterDescription + " (";

        Enumeration e = fileTypes.keys();

        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            description += ("*." + key + ((e.hasMoreElements()) ? ", " : ")"));
        }

        return description;
    }

    public void setFilterForChooser(JFileChooser fileChooser) {

        Enumeration e = fileTypes.keys();

        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            String value = (String) fileTypes.get(key);
            fileChooser.addChoosableFileFilter(new SimpleFileChooserFilter(
                    value, key, value));
        }

        fileChooser.addChoosableFileFilter(this);
    }

    public String getTypeDescription(File f) {
        String extension = getExtension(f);
        String type = null;

        if (extension != null) {
            type = (String) fileTypes.get(extension);
        }
        return type;
    }

    private static String getExtension(File f) {
        String ext = null;
        if (f != null) {
            String s = f.getName();
            int i = s.lastIndexOf('.');

            if (i > 0 && i < s.length() - 1) {
                ext = s.substring(i + 1).toLowerCase();
            }
        }
        return ext;
    }
}