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/*
 * 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: 07-Dec-2008
 */

package uk.me.parabola.mkgmap.osmstyle.actions;

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

/**
 * Part of a substitution string.  This can represent a constant
 * value or value that is taken from the element tags.
 *
 * @author Steve Ratcliffe
 */

public class ValueItem {
        private String tagname;
        private short tagKey;
        private ValueFilter filter;
        private String value;
        private boolean tagname_is_local;

        public ValueItem() {
        }

        public ValueItem(String value) {
                this.value = value;
        }

        public String getValue(Element el, Element local_el) {
                if (tagname == null && value != null)
                        return value;   // already known

                if (tagname != null) {
                        Element e = tagname_is_local ? local_el : el;
                        String tagval = e.getTag(tagKey);
                        if (filter != null)
                                value = filter.filter(tagval, local_el);
                        else
                                value = tagval;
                }

                return value;
        }

        public void addFilter(ValueFilter f) {
                if (filter == null)
                        filter = f;
                else
                        filter.add(f);
        }

        public String getTagname() {
                return tagname;
        }

        public void setTagname(String tagname, boolean local) {
                this.tagname = tagname;
                this.tagname_is_local = local;
                this.tagKey = TagDict.getInstance().xlate(tagname);
        }

        public String toString() {
                if (tagname == null)
                        return value;
                if (tagname_is_local) {
                        // TODO: don't ignore filter.
                        return "$(" + tagname + ")";
                } else {
                        // TODO: don't ignore filter.
                        return "${" + tagname + "}";
                }
        }
}