/*
* Copyright (c) 2015.
*
* 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.mkgmap.reader.osm.Element;
import uk.me.parabola.mkgmap.reader.osm.TagDict;
import uk.me.parabola.mkgmap.scan.SyntaxException;
/**
* This can be used to filter out redundant values.<br>
* <br>
* The filter checks whether the value is contained within another tag's value.
* If so, a null string is returned.<br>
* <br>
* Another tag should consist of values separated by a delimiter (semicolon ';'
* by default).<br>
* <br>
* Example:<br>
* <code>
* type=route & route=bus & ref=* {<br>
* apply {<br>
* set route_ref='$(route_ref),${ref|not-contained:,:route_ref}' | '$(route_ref)' | '${ref}';<br>
* }<br>
* }</code><br>
* Here, ref value is only added to route_ref when it is not already contained
* in that list (with separator ','). Otherwise, the value of route_ref is
* unchanged.
*
* @author Maxim Duester
*/
public class NotContainedFilter extends ValueFilter {
private String separator;
private short tagKey;
public NotContainedFilter(String arg) {
String[] temp = arg.split(":");
if (temp.length < 2 || temp[1].isEmpty())
throw new SyntaxException(
"Missing tag to compare in style not-contained command: "
+ arg);
// set the separator (default to ;)
if (temp[0].length() > 0)
separator = temp[0];
else
separator = ";";
// set the tag short value
tagKey = TagDict.getInstance().xlate(temp[1]);
}
public String doFilter(String value, Element el) {
if (value == null)
return null;
String tagValue = el.getTag(tagKey);
// tag not found => value not in tag's value
if (tagValue == null)
return value;
// split uses a regex we need to replace special characters
String[] temp = tagValue.split(Pattern.quote(separator));
for (String s : temp)
if (s.equals(value))
return null;
// nothing found => value not in tag's value
return value;
}
}