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-Jul-2008
 */
package uk.me.parabola.imgfmt.app.net;

import uk.me.parabola.imgfmt.ReadFailedException;
import uk.me.parabola.imgfmt.app.CommonHeader;
import uk.me.parabola.imgfmt.app.ImgFileReader;
import uk.me.parabola.imgfmt.app.ImgFileWriter;
import uk.me.parabola.imgfmt.app.Section;

/**
 * @author Steve Ratcliffe
 */
public class NODHeader extends CommonHeader {
        public static final int HEADER_LEN = 63;

        static final char DEF_ALIGN = 6;
        private static final char BOUNDARY_ITEM_SIZE = 9;

        private final Section nodes = new Section();
        private final Section roads = new Section(nodes);
        private final Section boundary = new Section(roads, BOUNDARY_ITEM_SIZE);

        /**
         * The driveOnLeft flag is set via a static method. Using a ThreadLocal
         * ensures thread safety when using more than one thread.
         */
        private static final ThreadLocal<Boolean> driveOnLeft = new ThreadLocal<Boolean>() {
                protected Boolean initialValue() {
                        return Boolean.FALSE;
                }
        };

        public NODHeader() {
                super(HEADER_LEN, "GARMIN NOD");
        }

        /**
         * Read the rest of the header.  Specific to the given file.  It is guaranteed
         * that the file position will be set to the correct place before this is
         * called.
         *
         * @param reader The header is read from here.
         */
        protected void readFileHeader(ImgFileReader reader) throws ReadFailedException {
        }

        /**
         * Write the rest of the header.  It is guaranteed that the writer will be set
         * to the correct position before calling.
         *
         * @param writer The header is written here.
         */
        protected void writeFileHeader(ImgFileWriter writer) {
                nodes.setPosition(HEADER_LEN);
                nodes.writeSectionInfo(writer);

                // now sets 0x02 (enable turn restrictions?)
                int val = 0x27;
                if(driveOnLeft.get())
                        val |= 0x0300;
                writer.putInt(val);

                char align = DEF_ALIGN;
                writer.putChar(align);
                writer.putChar((char) (align - 1));

                roads.writeSectionInfo(writer);
                writer.putInt(0);

                boundary.writeSectionInfo(writer);
        }

        public void setNodeStart(int start) {
                nodes.setPosition(start);
        }

        public void setNodeSize(int size) {
                nodes.setSize(size);
        }

        public Section getNodeSection() {
                return nodes;
        }

        public void setRoadSize(int size) {
                roads.setSize(size);
        }

        public Section getRoadSection() {
                return roads;
        }

        public void setBoundarySize(int size) {
                boundary.setSize(size);
        }

        public Section getBoundarySection() {
                return boundary;
        }

        public static void setDriveOnLeft(boolean dol) {
                driveOnLeft.set(dol);
        }
}