/*
 * Copyright (C) 2003-2004 Red Hat Inc. All Rights Reserved.
 *
 * This library 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
package com.arsdigita.templating;

import com.arsdigita.dispatcher.DispatcherHelper;
import javax.servlet.http.HttpServletRequest;

/**
 * Generates a pattern for based on the request dispatcher prefix,
 * eg /print/content/myitem.jsp     -> { 'print' }
 *    /text-only/content/myitem.jsp -> { 'text-only' }
 */
public class PrefixPatternGenerator implements PatternGenerator {

    /**
     * 
     * @param key
     * @param req
     * @return 
     */
    @Override
    public String[] generateValues(String key,
                                   HttpServletRequest req) {
        String value = DispatcherHelper.getDispatcherPrefix(req);
        if (value != null) {
            return new String[] { value.substring(1) };
        }
        else {
            return new String[] { };
        }
    }

}
