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/*
 * PrettyFaces is an OpenSource JSF library to create bookmarkable URLs.
 * Copyright (C) 2010 - Lincoln Baxter, III  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 3 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, see the file COPYING.LESSER
 * or visit the GNU website at .
 */

package com.ocpsoft.pretty.faces.rewrite.processor;

import java.util.regex.Matcher;

import com.ocpsoft.pretty.faces.config.rewrite.RewriteRule;
import com.ocpsoft.pretty.faces.rewrite.Processor;

/**
 * @author Lincoln Baxter, III 
 */
public class RegexProcessor implements Processor
{

    public String process(final RewriteRule rule, final String url)
    {
        if (url == null || rule.getMatch().isEmpty() || rule.getSubstitute().isEmpty())
        {
            return url;
        }

        Matcher m = rule.getPattern().matcher(url);
        StringBuffer result = new StringBuffer();
        while (m.find())
        {
            m.appendReplacement(result, rule.getSubstitute());
        }
        m.appendTail(result);
        return result.toString();
    }

}