Subversion Repositories mkgmap

/*
 * 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 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 static uk.me.parabola.imgfmt.app.net.AccessTagsAndBits.ACCESS_TAGS_COMPILED;

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

/**
 * Add one value to all mkgmap access tags, optionally changing them if they already exist.  
 * The value can have replacements from the current tags.
 *
 * @author WanMil
 */
public class AddAccessAction extends ValueBuildedAction {
        private final boolean modify;

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

        /**
         * Create an action to add the given value to all mkgmap access tags.
         * If the modify flag is false, then only those tags are set that do
         * not already exist.
         */
        public AddAccessAction(String value, boolean modify) {
                this.modify = modify;
                add(value);
        }

        public boolean perform(Element el) {
                // 1st build the value
                Element tags = valueTags != null ? valueTags : el;
                String accessValue = null;
                for (ValueBuilder value : getValueBuilder()) {
                        accessValue = value.build(tags, el);
                        if (accessValue != null) {
                                break;
                        }
                }
                if (accessValue == null) {
                        return false;
                }
                for (Short accessTag : ACCESS_TAGS_COMPILED.keySet()) {
                        setTag(el, accessTag, accessValue);
                }
                return true;
        }
       
        /**
         * Set the tag of the given element. In case the modify flag
         * is {@code true} the tag is always set. Otherwise the tag
         * is set only if it does not already exist.
         * @param el OSM element
         * @param tagKey the compiled tag key
         * @param value the value to be set
         */
        private void setTag(Element el, Short tagKey, String value) {
                if (modify) {
                        el.addTag(tagKey, value);
                } else {
                        String tv = el.getTag(tagKey);
                        if (tv == null) {
                                el.addTag(tagKey, value);
                        }
                }
        }

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

        public String toString() {
                return  (modify ? "setaccess " : "addaccess ") + calcValueBuildersString() + ";";
        }
}