/**
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 *	 Copyright (C) 2009 by Hector Suarez Barenca http://barenca.net
 *   <http://www.gnu.org/licenses/lgpl-3.0.html>
 *
 *   This file is a part of jAstyle library - an indentation and
 *   reformatting library for C, C++, C# and Java source files.
 *   <http://jastyle.sourceforge.net>
 *
 *   jAstyle is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   jAstyle 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with jAstyle.  If not, see <http://www.gnu.org/licenses/>.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 */

package decompsource.com.github.abrarsyed.jastyle;

import java.io.File;
import java.io.FilenameFilter;
import java.util.regex.Pattern;

public class FileWildcardFilter implements FilenameFilter
{
    private Pattern p;

    public FileWildcardFilter(String filenameWithWildcars)
    {
        p = Pattern.compile(replaceWildcards(filenameWithWildcars));
    }

    /**
     * Checks for * and ? in the wildcard variable and replaces them correct
     * pattern characters.
     *
     * @param wild - Wildcard name containing * and ?
     * @return - String containing modified wildcard name
     */
    private String replaceWildcards(String wild)
    {
        StringBuilder buffer = new StringBuilder();

        for (char c : wild.toCharArray())
        {
            // replace * with .*
            if (c == '*')
            {
                buffer.append(".*");
            }

            // replace ? with .
            else if (c == '?')
            {
                buffer.append(".");
            }

            // replace misc regex with escaped versions
            else if ("+()^$.{}[]|\\".indexOf(c) != -1)
            {
                buffer.append('\\').append(c);
            }

            // seems to be just a normal char
            else
            {
                buffer.append(c);
            }
        }

        // return the built buffer
        return buffer.toString();
    }

    @Override
    public boolean accept(File dir, String name)
    {
        // accept anything with
        return p.matcher(name).matches();
    }

}