Package org.h2.mvstore

Class FreeSpaceBitSet

java.lang.Object
org.h2.mvstore.FreeSpaceBitSet
public class FreeSpaceBitSet extends Object
A free space bit set.

  • Constructor Summary

    Constructors
    Constructor
    Description
    FreeSpaceBitSet(int firstFreeBlock, int blockSize)
    Create a new free space map.

  • Method Summary

    Modifier and Type
    Method
    Description
    long
    allocate(int length)
    Allocate a number of blocks and mark them as used.
    void
    clear()
    Reset the list.
    void
    free(long pos, int length)
    Mark the space as free.
    boolean
    isFree(long pos, int length)
    Check whether one of the blocks is free.
    boolean
    isUsed(long pos, int length)
    Check whether one of the blocks is in use.
    void
    markUsed(long pos, int length)
    Mark the space as in use.
    String
    toString()
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Constructor Details

    • FreeSpaceBitSet

      public FreeSpaceBitSet(int firstFreeBlock, int blockSize)
      Create a new free space map.
      Parameters:
      firstFreeBlock - the first free block
      blockSize - the block size

  • Method Details

    • clear

      public void clear()
      Reset the list.

    • isUsed

      public boolean isUsed(long pos, int length)
      Check whether one of the blocks is in use.
      Parameters:
      pos - the position in bytes
      length - the number of bytes
      Returns:
      true if a block is in use

    • isFree

      public boolean isFree(long pos, int length)
      Check whether one of the blocks is free.
      Parameters:
      pos - the position in bytes
      length - the number of bytes
      Returns:
      true if a block is free

    • allocate

      public long allocate(int length)
      Allocate a number of blocks and mark them as used.
      Parameters:
      length - the number of bytes to allocate
      Returns:
      the start position in bytes

    • markUsed

      public void markUsed(long pos, int length)
      Mark the space as in use.
      Parameters:
      pos - the position in bytes
      length - the number of bytes

    • free

      public void free(long pos, int length)
      Mark the space as free.
      Parameters:
      pos - the position in bytes
      length - the number of bytes

    • toString

      public String toString()
      Overrides:
      toString in class Object