RoaringDocIdSet (Lucene 7.7.0 API)

java.lang.Object
- org.apache.lucene.search.DocIdSet
- - org.apache.lucene.util.RoaringDocIdSet

All Implemented Interfaces:

Accountable
```
public class RoaringDocIdSet
extends DocIdSet
```
DocIdSet implementation inspired from http://roaringbitmap.org/ The space is divided into blocks of 2^16 bits and each block is encoded independently. In each block, if less than 2^12 bits are set, then documents are simply stored in a short[]. If more than 2^16-2^12 bits are set, then the inverse of the set is encoded in a simple short[]. Otherwise a FixedBitSet is used.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class RoaringDocIdSet.Builder
A builder of RoaringDocIdSets.

Field Summary
- Fields inherited from class org.apache.lucene.search.DocIdSet
  EMPTY

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`cardinality()`	Return the exact number of documents that are contained in this set.
`DocIdSetIterator`	`iterator()`	Provides a `DocIdSetIterator` to access the set.
`long`	`ramBytesUsed()`	Return the memory usage of this object in bytes.
`String`	`toString()`

Methods inherited from class org.apache.lucene.search.DocIdSet
bits

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.lucene.util.Accountable
getChildResources

- Method Detail
  - ramBytesUsed
```
public long ramBytesUsed()
```
    Description copied from interface: Accountable
    
    Return the memory usage of this object in bytes. Negative values are illegal.
  - iterator
```
public DocIdSetIterator iterator()
                          throws IOException
```
    Description copied from class: DocIdSet
    
    Provides a DocIdSetIterator to access the set. This implementation can return null if there are no docs that match.
    
    Specified by:
    
    iterator in class DocIdSet
    
    Throws:
    
    IOException
  - cardinality
```
public int cardinality()
```
    Return the exact number of documents that are contained in this set.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object