Package it.unimi.dsi.sux4j.bits

Class SimpleBigSelect

java.lang.Object
it.unimi.dsi.sux4j.bits.SimpleBigSelect
All Implemented Interfaces:
Select, Serializable
public class SimpleBigSelect extends Object implements Select
A big version of SimpleSelect that can only be used with a LongBigArrayBitVector (or long big arrays).
See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    SimpleBigSelect(long[][] bits, long length)
    Creates a new selection structure using a bit vector specified by a big array of longs and a number of bits.
    SimpleBigSelect(LongBigArrayBitVector bitVector)
    Creates a new selection structure using the specified instance of LongArrayBitVector.

  • Method Summary

    Modifier and Type
    Method
    Description
    LongBigArrayBitVector
    bitVector()
    Returns the bit vector indexed by this structure.
    long
    numBits()
    Returns the overall number of bits allocated by this structure.
    long
    select(long rank)
    Returns the position of the bit of given rank.
    long[]
    select(long rank, long[] dest)
    Performs a bulk select of consecutive ranks into a given array.
    long[]
    select(long rank, long[] dest, int offset, int length)
    Performs a bulk select of consecutive ranks into a given array fragment.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • SimpleBigSelect

      public SimpleBigSelect(long[][] bits, long length)
      Creates a new selection structure using a bit vector specified by a big array of longs and a number of bits.
      Parameters:
      bits - a big array of longs representing a bit array.
      length - the number of bits to use from bits.

    • SimpleBigSelect

      public SimpleBigSelect(LongBigArrayBitVector bitVector)
      Creates a new selection structure using the specified instance of LongArrayBitVector.
      Parameters:
      bitVector - an instance of LongArrayBitVector.

  • Method Details

    • select

      public long select(long rank)
      Description copied from interface: Select
      Returns the position of the bit of given rank. Equivalently, returns the greatest position that is preceded by the specified number of ones.
      Specified by:
      select in interface Select
      Parameters:
      rank - a rank.
      Returns:
      the position of the bit of given rank; if no such bit exists, behavior is undefined .

    • select

      public long[] select(long rank, long[] dest, int offset, int length)
      Description copied from interface: Select
      Performs a bulk select of consecutive ranks into a given array fragment.
      Specified by:
      select in interface Select
      Parameters:
      rank - the first rank to select.
      dest - the destination array; it will be filled with length positions of consecutive bits starting at position offset; must be of length greater than offset.
      offset - the first bit position written in dest.
      length - the number of bit positions in dest starting at offset.
      Returns:
      dest
      See Also:

    • select

      public long[] select(long rank, long[] dest)
      Description copied from interface: Select
      Performs a bulk select of consecutive ranks into a given array.
      Specified by:
      select in interface Select
      Parameters:
      rank - the first rank to select.
      dest - the destination array; it will be filled with position of consecutive bits.
      Returns:
      dest
      See Also:

    • numBits

      public long numBits()
      Description copied from interface: Select
      Returns the overall number of bits allocated by this structure.
      Specified by:
      numBits in interface Select
      Returns:
      the overall number of bits allocated by this structure (not including the bits of the indexed vector).

    • bitVector

      public LongBigArrayBitVector bitVector()
      Description copied from interface: Select
      Returns the bit vector indexed by this structure.

      Note that you are not supposed to modify the returned vector.

      Specified by:
      bitVector in interface Select
      Returns:
      the bit vector indexed by this structure.