package org.apache.maven.simian;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache Maven" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache Maven", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * ====================================================================
 */

import java.util.StringTokenizer;
import java.io.File;
import java.net.URL;

/**
 *
 * @author Aslak Hellesoy
 * @version $Revision: 1.1 $
 */
public class FileUtils {
    /**
     * Returns the root directory of the package hierarchy where this class is
     * located. This will either be a directory or a jar file.
     *
     * @return the root directory or jar file where the class is located.
     */
    public static File getRoot(Class clazz)
    {
        File dir;
        URL classURL = clazz.getResource( "/" + clazz.getName().replace( '.', '/' ) + ".class" );
        String classFile = classURL.getFile();

        if( classFile.indexOf('!') != -1 ) {
            // Sometimes (at least on windows) we get file:F:\bla. Convert to file:/F:/bla
            if( classFile.charAt(5) != '/' ) {
                classFile = "file:/" + classFile.substring(5);
            }
            classFile = classFile.replace( '\\','/' );
            String uriSpec = classFile.substring(0, classFile.indexOf('!'));
            dir = new File( uriSpec  );
            // NOTE: This used to be here, but I've replaced it with the above single
            //       line without understanding the ramifications. The code below needs JDK1.4
            //try {
            //    dir = new File( new URL( uriSpec ) );
            //} catch (URISyntaxException e) {
            //    System.err.println("Couldn't create URI for " + uriSpec);
            //    throw new IllegalStateException(e.getMessage());
            //}
        } else {
            dir = new File( classFile ).getParentFile();
            StringTokenizer st = new StringTokenizer( clazz.getName(), "." );

            for( int i = 0; i < st.countTokens() - 1; i++ )
            {
                dir = dir.getParentFile();
            }
        }
        return dir;
    }
}
