程序包 org.bitlap.roaringbitmap.buffer

The org.roaringbitmap.buffer package provides two classes (MutableRoaringBitmap and (ImmutableRoaringBitmap) that users can rely upon for fast set of integers.

请参阅: 说明

接口概要

接口	说明
MappeableContainerPointer	This interface allows you to iterate over the containers in a roaring bitmap.
PointableRoaringArray	Generic interface for the array underlying roaring bitmap classes.

类概要

类	说明
ArrayBatchIterator
BitmapBatchIterator
BufferBitSetUtil	This class provides convenience functions to manipulate BitSet and MutableRoaringBitmap objects.
BufferFastAggregation	Fast algorithms to aggregate many bitmaps.
BufferIntIteratorFlyweight	Fast iterator minimizing the stress on the garbage collector.
BufferParallelAggregation	These utility methods provide parallel implementations of logical aggregation operators.
BufferParallelAggregation.ContainerCollector	Collects containers grouped by their key into a RoaringBitmap, applying the supplied aggregation function to each group.
BufferParallelAggregation.OrCollector	Collects a list of containers into a single container.
BufferReverseIntIteratorFlyweight	Fast iterator minimizing the stress on the garbage collector.
BufferUtil	Various useful methods for roaring bitmaps.
ImmutableRoaringArray	This is the underlying data structure for an ImmutableRoaringBitmap.
ImmutableRoaringBitmap	ImmutableRoaringBitmap provides a compressed immutable (cannot be modified) bitmap.
MappeableArrayContainer	Simple container made of an array of 16-bit integers.
MappeableBitmapContainer	Simple bitset-like container.
MappeableContainer	Base container class.
MappeableRunContainer	This container takes the form of runs of consecutive values (effectively, run-length encoding).
MutableRoaringArray	Specialized array to store the containers used by a RoaringBitmap.
MutableRoaringBitmap	MutableRoaringBitmap, a compressed alternative to the BitSet.
MutableRoaringBitmapPrivate	已过时
MutableRoaringBitmapSupplier	A BitmapDataProviderSupplier providing MutableRoaringBitmap as BitmapDataProvider
RoaringBatchIterator
RunBatchIterator

程序包org.bitlap.roaringbitmap.buffer的说明

The org.roaringbitmap.buffer package provides two classes (MutableRoaringBitmap and (ImmutableRoaringBitmap) that users can rely upon for fast set of integers. It differs from the org.roaringbitmap in that the backing stores are ByteBuffers. Initially, one wants to construct a bitmap using the MutableRoaringBitmap class. After serialization, one can memory-map an ImmutableRoaringBitmap to the serialized bytes, enabling off-heap processing.

 
      import org.roaringbitmap.buffer.*;

      //...

      MutableRoaringBitmap r1 = new MutableRoaringBitmap();
      for(int k = 4000; k<4255;++k) r1.add(k);
      
      MutableRoaringBitmap r2 = new MutableRoaringBitmap();
      for(int k = 1000; k<4255; k+=2) r2.add(k);

      MutableRoaringBitmap union = ImmutableRoaringBitmap.or(r1, r2);
      MutableRoaringBitmap intersection = ImmutableRoaringBitmap.and(r1, r2);

      //...
      DataOutputStream wheretoserialize = ...
      r1.runOptimize(); // can help compression
      r1.serialize(wheretoserialize);