Package org.h2.mvstore

Class FreeSpaceBitSet

  • public class FreeSpaceBitSet
extends java.lang.Object
    A free space bit set.

    • Constructor Summary

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

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      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.
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • FreeSpaceBitSet

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

    • Method Detail

      • 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 java.lang.String toString()
        Overrides:
        toString in class java.lang.Object