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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
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package org.hsqldb.persist;

import org.hsqldb.lib.DoubleIntIndex;

/**
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.3.3
 * @since 2.3.0
 */
public interface DataSpaceManager {

    int tableIdEmpty     = 0;
    int tableIdDirectory = 1;
    int tableIdLookup    = 5;
    int tableIdSetAside  = 6;
    int tableIdDefault   = 7;
    int tableIdFirst     = 8;

    //
    int fixedBlockSizeUnit = 4096;

    TableSpaceManager getDefaultTableSpace();

    TableSpaceManager getTableSpace(int spaceId);

    int getNewTableSpaceID();

    long getFileBlocks(int spaceId, int blockCount);

    void freeTableSpace(int spaceId);

    void freeTableSpace(int spaceId, DoubleIntIndex spaceList, long offset,
                        long limit, boolean full);

    long getLostBlocksSize();

    boolean isModified();

    int getFileBlockSize();

    void initialiseSpaces();

    void reset();

    boolean isMultiSpace();

    int getFileBlockItemCount();

    DirectoryBlockCachedObject[] getDirectoryList();
}