/*
* Copyright (C) 2008-2012 Steve Ratcliffe
*
* 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.
*
*
* Author: Steve Ratcliffe
* Create date: 06-Nov-2008
*/
package uk.me.parabola.mkgmap.osmstyle.eval;
import uk.me.parabola.mkgmap.reader.osm.Element;
/**
* Tests for the existence of a tag. Return true if the tag exists, regardless
* of value.
*
* @author Steve Ratcliffe
*/
public class ExistsOp extends AbstractOp {
public ExistsOp() {
setType(NodeType.EXISTS);
}
public void setFirst(Op first) {
super.setFirst(first);
}
public boolean eval(Element el) {
return first.value(el) != null;
}
public int priority() {
return 10;
}
public String toString() {
return first + "=*";
}
}