模块 roaringbitmap
程序包 org.bitlap.roaringbitmap

类 BitSetUtil

java.lang.Object
org.bitlap.roaringbitmap.BitSetUtil
public class BitSetUtil extends Object
This class provides convenience functions to manipulate BitSet and RoaringBitmap objects.

  • 字段概要

    字段
    修饰符和类型
    字段
    说明
    static final int
    BLOCK_LENGTH
     

  • 构造器概要

    构造器
    构造器
    说明
    BitSetUtil()
     

  • 方法概要

    修饰符和类型
    方法
    说明
    static RoaringBitmap
    bitmapOf(long[] words)
    Generate a RoaringBitmap out of a long[], each long using little-endian representation of its bits
    static RoaringBitmap
    bitmapOf(ByteBuffer bb, boolean fastRank)
    Efficiently generate a RoaringBitmap from an uncompressed byte array or ByteBuffer This method tries to minimise all kinds of memory allocation
    static RoaringBitmap
    bitmapOf(ByteBuffer bb, boolean fastRank, long[] wordsBuffer)
    Efficiently generate a RoaringBitmap from an uncompressed byte array or ByteBuffer This method tries to minimise all kinds of memory allocation
    You can provide a cached wordsBuffer for avoiding 8 KB of extra allocation on every call No reference is kept to the wordsBuffer, so it can be cached as a ThreadLocal
    static RoaringBitmap
    bitmapOf(BitSet bitSet)
    Generate a RoaringBitmap out of a BitSet
    static boolean
    equals(BitSet bitset, RoaringBitmap bitmap)
    Compares a RoaringBitmap and a BitSet.

    从类继承的方法 java.lang.Object

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

  • 字段详细资料

    • BLOCK_LENGTH

      public static final int BLOCK_LENGTH
      另请参阅:

  • 构造器详细资料

    • BitSetUtil

      public BitSetUtil()

  • 方法详细资料

    • bitmapOf

      public static RoaringBitmap bitmapOf(BitSet bitSet)
      Generate a RoaringBitmap out of a BitSet
      参数:
      bitSet - original bitset (will not be modified)
      返回:
      roaring bitmap equivalent to BitSet

    • bitmapOf

      public static RoaringBitmap bitmapOf(long[] words)
      Generate a RoaringBitmap out of a long[], each long using little-endian representation of its bits
      参数:
      words - array of longs (will not be modified)
      返回:
      roaring bitmap
      另请参阅:

    • bitmapOf

      public static RoaringBitmap bitmapOf(ByteBuffer bb, boolean fastRank)
      Efficiently generate a RoaringBitmap from an uncompressed byte array or ByteBuffer This method tries to minimise all kinds of memory allocation
      参数:
      bb - the uncompressed bitmap
      fastRank - if set, returned bitmap is of type FastRankRoaringBitmap
      返回:
      roaring bitmap

    • bitmapOf

      public static RoaringBitmap bitmapOf(ByteBuffer bb, boolean fastRank, long[] wordsBuffer)
      Efficiently generate a RoaringBitmap from an uncompressed byte array or ByteBuffer This method tries to minimise all kinds of memory allocation
      You can provide a cached wordsBuffer for avoiding 8 KB of extra allocation on every call No reference is kept to the wordsBuffer, so it can be cached as a ThreadLocal
      参数:
      bb - the uncompressed bitmap
      fastRank - if set, returned bitmap is of type FastRankRoaringBitmap
      wordsBuffer - buffer of length BLOCK_LENGTH
      返回:
      roaring bitmap

    • equals

      public static boolean equals(BitSet bitset, RoaringBitmap bitmap)
      Compares a RoaringBitmap and a BitSet. They are equal if and only if they contain the same set of integers.
      参数:
      bitset - first object to be compared
      bitmap - second object to be compared
      返回:
      whether they are equals