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: 06-Dec-2008
 */
package uk.me.parabola.mkgmap.osmstyle.actions;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

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

/**
 * This is an action that contains sub-actions. It is used for Relations where
 * you want to apply the commands to the elements that are contained in the
 * relation and not on the relation itself.
 *
 * @author Steve Ratcliffe
 */
public class SubAction implements Action {
        private final List<Action> actionList = new ArrayList<>();
        private final String role;
        private final String selector;

        public SubAction(String role, String selector) {
                this.role = role;
                this.selector = selector;
        }

        public boolean perform(Element el) {
                if (el instanceof Relation)
                        performOnSubElements((Relation) el);
                return true; // probably false, but relation may contain itself in
                                                // complex recursive structures
        }

        private void performOnSubElements(Relation rel) {
                List<Map.Entry<String, Element>> elements = rel.getElements();

                for (Action a : actionList) {
                        if (a instanceof AddTagAction)
                                ((AddTagAction) a).setValueTags(rel);
                        else if (a instanceof AddAccessAction)
                                ((AddAccessAction) a).setValueTags(rel);
                }

                boolean once = "once".equals(selector);
                boolean onlyFirst = "first".equals(selector);
                HashSet<Element> elems = once ? new HashSet<>() : null;

                for (Map.Entry<String, Element> r_el : elements) {
                        if ((role == null || role.equals(r_el.getKey())) && (!once || elems.add(r_el.getValue()))) {
                                actionList.forEach(a -> a.perform(r_el.getValue()));
                        }
                        if (onlyFirst)
                                break;
                }
        }

        public void add(Action act) {
                actionList.add(act);
        }

        public String toString() {
                StringBuilder sb = new StringBuilder();
                sb.append("apply");
                if (selector != null) {
                        sb.append(String.format("_%s", selector));
                }
                if (role != null)
                        sb.append(String.format(" role=%s ", role));

                sb.append(actionList.stream().map(Action::toString).collect(Collectors.joining(" ", "{", "}")));
                return sb.toString();
        }
}