Subversion Repositories mkgmap

/*
 * Copyright 2009 Toby Speight
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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 General Public License for more details.
 */
package uk.me.parabola.mkgmap.osmstyle.actions;

import uk.me.parabola.mkgmap.reader.osm.Element;

/**
 * Perform simple string substitution on a value.
 *
 * @author Toby Speight
 */
public class SubstitutionFilter extends ValueFilter {
        private final String from;
        private final String to;

        public SubstitutionFilter(String arg) {
                int i = arg.indexOf("=>");
                if (i >= 0) {
                        from = arg.substring(0, i);
                        to = arg.substring(i + 2);
                } else {
                        from = arg;
                        to = "";
                }
        }

        public String doFilter(String value, Element el) {
                if (value == null) return null;
                if (from == null || to == null)
                        // can't happen!
                        return value;
                return value.replace(from, to);
        }
}