Subversion Repositories mkgmap

/*
 * Copyright (C) 2011.
 *
 * 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.imgfmt.app.mdr;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import uk.me.parabola.imgfmt.app.ImgFileWriter;
import uk.me.parabola.imgfmt.app.srt.Sort;
import uk.me.parabola.imgfmt.app.srt.SortKey;

/**
 * One of these per region name. There are pointers into the other sections
 * that are sorted by region to the first record that has the given name.
 *
 * @author Steve Ratcliffe
 */
public class Mdr28 extends MdrSection implements HasHeaderFlags {
        private final List<Mdr28Record> index = new ArrayList<Mdr28Record>();

        public Mdr28(MdrConfig config) {
                setConfig(config);
        }

        public void buildFromRegions(List<Mdr13Record> regions) {
                Sort sort = getConfig().getSort();
                List<SortKey<Mdr13Record>> keys = MdrUtils.sortList(sort, regions);

                int record = 0;
                Mdr28Record mdr28 = null;
                String lastName = null;
                for (SortKey<Mdr13Record> key : keys) {
                        Mdr13Record region = key.getObject();

                        String name = region.getName();
                        if (!name.equals(lastName)) {
                                record++;
                                mdr28 = new Mdr28Record();
                                mdr28.setIndex(record);
                                mdr28.setName(name);
                                mdr28.setStrOffset(region.getStrOffset());
                                mdr28.setMdr14(region.getMdr14());

                                index.add(mdr28);
                                lastName = name;
                        }

                        assert mdr28 != null;
                        region.setMdr28(mdr28);
                }
        }

        /**
         * Write out the contents of this section.
         *
         * @param writer Where to write it.
         */
        public void writeSectData(ImgFileWriter writer) {
                PointerSizes sizes = getSizes();
                int size21 = sizes.getSize(21);
                int size23 = sizes.getSize(23);
                int size27 = sizes.getSize(27);

                int idx = 0;
                for (Mdr28Record mdr28 : index) {
                        putN(writer, size23, mdr28.getMdr23());
                        putStringOffset(writer, mdr28.getStrOffset());
                        putN(writer, size21, mdr28.getMdr21());
                        putN(writer, size27, mdr28.getMdr27());

                        idx++;
                }
        }

        /**
         * The size of a record in the section.  This is not a constant and might vary
         * on various factors, such as the file version, if we are preparing for a
         * device, the number of maps etc.
         *
         * @return The size of a record in this section.
         */
        public int getItemSize() {
                PointerSizes sizes = getSizes();

                return sizes.getSize(23)
                                + sizes.getStrOffSize()
                                + sizes.getSize(21)
                                + sizes.getSize(27);
        }

        /**
         * The number of records in this section.
         *
         * @return The number of items in the section.
         */
        protected int numberOfItems() {
                return index.size();
        }

        /**
         * Flag purposes are not known.
         */
        public int getExtraValue() {
                return 0x7;
        }

        public List<Mdr28Record> getIndex() {
                return Collections.unmodifiableList(index);
        }
}