Subversion Repositories mkgmap

/*
 * Copyright (C) 2008 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: 15-Nov-2008
 */
package uk.me.parabola.mkgmap.osmstyle.actions;

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

/**
 * Add a tag, optionally changing it if it already exists.  The value that
 * the tag is set to can have replacements from the current tags.
 *
 * @author Steve Ratcliffe
 */
public class AddTagAction extends ValueBuildedAction {
        private final boolean modify;
        private final String tag;
        private final short tagKey;

        // The tags used to build the value.
        private Element valueTags;

        /**
         * Create an action to add the given tag with a value.
         * If the modify flag is true, then we change the tag if it
         * already exists.
         */
        public AddTagAction(String tag, String value, boolean modify) {
                this.modify = modify;
                this.tag = tag;
                this.tagKey = TagDict.getInstance().xlate(tag);
                add(value);
        }

        public boolean perform(Element el) {
                if (!modify && el.getTag(tagKey) != null)
                        return false;
               
                Element tags = valueTags != null ? valueTags : el;

                for (ValueBuilder value : getValueBuilder()) {
                        String newval = value.build(tags, el);
                        if (newval != null) {
                                el.addTag(tagKey, newval);
                                return true;
                        }
                }
                return false;
        }


        public void setValueTags(Element valueTags) {
                this.valueTags = valueTags;
        }

        public String toString() {
                return (modify ? "set " : "add ") + tag + "=" + calcValueBuildersString() + ";";
        }
}