Subversion Repositories mkgmap

/*
 * Copyright (c) 2013.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * 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 java.util.regex.Pattern;
import uk.me.parabola.imgfmt.ExitException;
import uk.me.parabola.mkgmap.reader.osm.Element;

/**
 * Get a part of a value.
 * value is split at a separator that defaults to semicolon ';'
 * by default the first part is returned
 * if the optional second parameter 'partnumber' is bigger
 * than the number of parts in the value then null is returned
 *
 * @author Franco Bez
 */
public class PartFilter extends ValueFilter {
        private String separator;
        private int partnumber;

        public PartFilter(String arg) {
                String[] temp = arg.split(":");
                partnumber = 1;
                try {
                        if( temp.length > 1 ) {
                                partnumber = Integer.parseInt(temp[1]);
                        }
                        if(temp[0].length() > 0 ){
                                separator = temp[0];
                        }
                        else{
                                separator = ";";
                        }
                } catch (NumberFormatException e) {
                        throw new ExitException("Not valid numbers in style part command: " + arg);
                }
        }

        public String doFilter(String value, Element el) {
                if (value == null) return null;
                // split uses a regex we need to replace special characters
                String[] temp = value.split(Pattern.quote(separator));
                if (temp.length >= partnumber)
                        return temp[partnumber-1].trim();
                return null;
        }
}