模块 roaringbitmap
程序包 org.bitlap.roaringbitmap.buffer

类 BufferBitSetUtil

java.lang.Object
org.bitlap.roaringbitmap.buffer.BufferBitSetUtil
public class BufferBitSetUtil extends Object
This class provides convenience functions to manipulate BitSet and MutableRoaringBitmap objects.

  • 构造器详细资料

    • BufferBitSetUtil

      public BufferBitSetUtil()

  • 方法详细资料

    • bitmapOf

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

    • bitmapOf

      public static MutableRoaringBitmap bitmapOf(long[] words)
      Generate a MutableRoaringBitmap 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 MutableRoaringBitmap bitmapOf(ByteBuffer bb)
      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
      返回:
      roaring bitmap

    • bitmapOf

      public static MutableRoaringBitmap bitmapOf(ByteBuffer bb, 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
      wordsBuffer - buffer of length BitSetUtil.BLOCK_LENGTH
      返回:
      roaring bitmap

    • equals

      public static boolean equals(BitSet bitset, ImmutableRoaringBitmap 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 equal