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This project contains some of the configurable modules used within the Heritrix application to crawl the web. The modules in this project can be used in applications other than Heritrix, however.

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/*RELICENSE-RESEARCH*/
/*
 * Created on 2006-aug-25
 *
 * Copyright (C) 2006 Royal Library of Sweden.
 *
 * This program 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
 * of the License, or (at your option) any later version.
 *
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package org.archive.modules.canonicalize;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Strip any extra slashes, '/', found in the path. 
 * Use this rule to equate 'http://www.archive.org//A//B/index.html' and 
 * 'http://www.archive.org/A/B/index.html'."
 */
public class StripExtraSlashes extends BaseRule {
    private static final long serialVersionUID = 1L;

    private static final Pattern REGEX = Pattern.compile("(^https?://.*?)//+(.*)");

    public StripExtraSlashes() {
        super();
    }

    public String canonicalize(String url) {
        Matcher matcher = REGEX.matcher(url);
        while (matcher.matches()) {
            url = matcher.group(1) + "/" + matcher.group(2);
            matcher = REGEX.matcher(url);
        }
        return url;
    }
}