/*
* 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 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;
/**
* Set the first unset label on the given element. The tags of the element may be
* used in setting the label.
*
* We have a list of possible substitutions.
*/
public class AddLabelAction extends ValueBuildedAction {
/**
* Search for the first matching pattern and set the first unset element label
* to it.
*
* If all four labels are already set, then nothing is done.
*
* @param el The element on which a label may be set.
* @return
*/
public boolean perform(Element el) {
for (int index = 1; index <=4; index++) {
// find the first unset label and set it
if (el.getTag("mkgmap:label:"+index) == null) {
for (ValueBuilder vb : getValueBuilder()) {
String s = vb.build(el, el);
if (s != null) {
// now check if the new label is different to all other labels
for (int n = index-1; n>= 1; n--) {
if (s.equals(el.getTag("mkgmap:label:"+n))) {
// value is equal to a previous label
// do not use it
return false;
}
}
// set the label
el.addTag("mkgmap:label:"+index, s);
return true;
}
}
return false;
}
}
return false;
}
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("addlabel ");
for (ValueBuilder vb : getValueBuilder()) {
sb.append(vb);
sb.append(" | ");
}
sb.setLength(sb.length() - 3);
return sb.toString();
}
}