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HSQLDB - Lightweight 100% Java SQL Database Engine
There is a newer version: 2.7.2
/* Copyright (c) 2001-2019, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
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 *
 * Redistributions in binary form must reproduce the above copyright notice,
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.persist;

import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.DoubleIntIndex;

/**
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.3.0
 * @since 2.3.0
 */
public class TableSpaceManagerSimple implements TableSpaceManager {

    DataFileCache cache;
    final int     scale;

    public TableSpaceManagerSimple(DataFileCache cache) {
        this.cache = cache;
        this.scale = cache.getDataFileScale();
    }

    public int getSpaceID() {
        return DataSpaceManager.tableIdDefault;
    }

    public void release(long pos, int rowSize) {}

    /**
     * Returns the position of a free block or 0.
     */
    public long getFilePosition(int rowSize, boolean asBlocks) {

        cache.writeLock.lock();

        try {
            long position;
            long newFreePosition;

            position        = cache.getFileFreePos() / scale;
            newFreePosition = cache.getFileFreePos() + rowSize;

            if (newFreePosition > cache.maxDataFileSize) {
                cache.logSevereEvent("data file reached maximum size "
                                     + cache.dataFileName, null);

                throw Error.error(ErrorCode.DATA_FILE_IS_FULL);
            }

            cache.fileFreePosition = newFreePosition;

            return position;
        } finally {
            cache.writeLock.unlock();
        }
    }

    public boolean hasFileRoom(long blockSize) {
        return true;
    }

    public void addFileBlock(long blockFreePos, long blockLimit) {}

    public void initialiseFileBlock(DoubleIntIndex lookup, long blockFreePos,
                                    long blockLimit) {}

    public void reset() {}

    public long getLostBlocksSize() {
        return 0;
    }

    public boolean isDefaultSpace() {
        return true;
    }
}