Package org.roaringbitmap.buffer

Class BufferBitSetUtil

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

  • Constructor Details

    • BufferBitSetUtil

      public BufferBitSetUtil()

  • Method Details

    • bitmapOf

      public static MutableRoaringBitmap bitmapOf​(BitSet bitSet)
      Generate a MutableRoaringBitmap out of a BitSet
      Parameters:
      bitSet - original bitset (will not be modified)
      Returns:
      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
      Parameters:
      words - array of longs (will not be modified)
      Returns:
      roaring bitmap
      See Also:
      for an equivalent

    • 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
      Parameters:
      bb - the uncompressed bitmap
      Returns:
      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
      Parameters:
      bb - the uncompressed bitmap
      wordsBuffer - buffer of length BitSetUtil.BLOCK_LENGTH
      Returns:
      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.
      Parameters:
      bitset - first object to be compared
      bitmap - second object to be compared
      Returns:
      whether they are equal