java.lang.Object
- tech.tablesaw.selection.BitSetBackedSelection

All Implemented Interfaces:

it.unimi.dsi.fastutil.ints.IntIterable, Iterable<Integer>, Selection
```
public class BitSetBackedSelection
extends Object
implements Selection
```
A Selection implemented using java.util.BitSet

Constructor Summary

Constructors
Constructor	Description
`BitSetBackedSelection()`	Constructs an empty Selection
`BitSetBackedSelection(int size)`	Returns a selection initialized from 0 to the given size, which cane be used for queries that exclude certain items, by first selecting the items to exclude, then flipping the bits.
`BitSetBackedSelection(int[] arr)`	Constructs a selection containing the elements in the given array
`BitSetBackedSelection(BitSet bitmap)`	Constructs a selection containing the elements in the given bitmap

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`BitSetBackedSelection`	`add(int... ints)`	Adds the given integers to the Selection if it is not already present, and does nothing otherwise
`Selection`	`addRange(int start, int end)`	Adds to the current bitmap all integers in [rangeStart,rangeEnd)
`Selection`	`and(Selection otherSelection)`	Intersects the receiver and `otherSelection`, updating the receiver
`Selection`	`andNot(Selection otherSelection)`	Implements the set difference operation between the receiver and `otherSelection`, after updating the receiver
`Selection`	`clear()`	Returns this selection with all its values cleared
`boolean`	`contains(int i)`	Returns true if the index i is selected in this object
`boolean`	`equals(Object o)`
`BitSetBackedSelection`	`flip(int rangeStart, int rangeEnd)`	Returns a selection with the bits from this selection flipped over the given range
`int`	`get(int indexToFind)`	Returns the value of the ith element.
`int`	`hashCode()`
`boolean`	`isEmpty()`	Returns true if this selection has no values, and false otherwise
`it.unimi.dsi.fastutil.ints.IntIterator`	`iterator()`	Returns a fastUtil intIterator that wraps a bitmap intIterator
`Selection`	`or(Selection otherSelection)`	Implements the union of the receiver and `otherSelection`, updating the receiver
`BitSetBackedSelection`	`removeRange(long start, long end)`	Removes from the current bitmap from all integers in [rangeStart,rangeEnd)
`protected static BitSetBackedSelection`	`selectNRowsAtRandom(int n, int max)`	Returns an randomly generated selection of size N where Max is the largest possible value
`int`	`size()`	Returns the number of integers represented by this Selection
`int[]`	`toArray()`	Returns the elements of this selection as an array of ints
`String`	`toString()`
`static BitSetBackedSelection`	`with(int... rows)`	Returns a Selection containing all indexes in the array
`protected static Selection`	`withoutRange(int totalRangeStart, int totalRangeEnd, int excludedRangeStart, int excludedRangeEnd)`	Returns a Selection containing all values from totalRangeStart to totalRangeEnd, except for those in the range from excludedRangeStart to excludedRangeEnd.
`static BitSetBackedSelection`	`withRange(int start, int end)`	Returns a Selection containing all indexes in the range start (inclusive) to end (exclusive),

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

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntIterable
forEach, forEach, forEach, intIterator, intSpliterator, spliterator

- Constructor Detail
  - BitSetBackedSelection
```
public BitSetBackedSelection(int size)
```
    Returns a selection initialized from 0 to the given size, which cane be used for queries that exclude certain items, by first selecting the items to exclude, then flipping the bits.
    
    Parameters:
    
    size - The size The end point, exclusive
  - BitSetBackedSelection
```
public BitSetBackedSelection(int[] arr)
```
    Constructs a selection containing the elements in the given array
  - BitSetBackedSelection
```
public BitSetBackedSelection(BitSet bitmap)
```
    Constructs a selection containing the elements in the given bitmap
  - BitSetBackedSelection
```
public BitSetBackedSelection()
```
    Constructs an empty Selection
- Method Detail
  - removeRange
```
public BitSetBackedSelection removeRange(long start,
                                         long end)
```
    Removes from the current bitmap from all integers in [rangeStart,rangeEnd)
    
    Specified by:
    
    removeRange in interface Selection
    
    Parameters:
    
    start - inclusive beginning of range
    
    end - exclusive ending of range
  - flip
```
public BitSetBackedSelection flip(int rangeStart,
                                  int rangeEnd)
```
    Returns a selection with the bits from this selection flipped over the given range
    
    Specified by:
    
    flip in interface Selection
  - add
```
public BitSetBackedSelection add(int... ints)
```
    Adds the given integers to the Selection if it is not already present, and does nothing otherwise
    
    Specified by:
    
    add in interface Selection
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - size
```
public int size()
```
    Returns the number of integers represented by this Selection
    
    Specified by:
    
    size in interface Selection
  - toArray
```
public int[] toArray()
```
    Returns the elements of this selection as an array of ints
    
    Specified by:
    
    toArray in interface Selection
  - and
```
public Selection and(Selection otherSelection)
```
    Intersects the receiver and otherSelection, updating the receiver
    
    Specified by:
    
    and in interface Selection
  - or
```
public Selection or(Selection otherSelection)
```
    Implements the union of the receiver and otherSelection, updating the receiver
    
    Specified by:
    
    or in interface Selection
  - andNot
```
public Selection andNot(Selection otherSelection)
```
    Implements the set difference operation between the receiver and otherSelection, after updating the receiver
    
    Specified by:
    
    andNot in interface Selection
  - isEmpty
```
public boolean isEmpty()
```
    Returns true if this selection has no values, and false otherwise
    
    Specified by:
    
    isEmpty in interface Selection
  - clear
```
public Selection clear()
```
    Returns this selection with all its values cleared
    
    Specified by:
    
    clear in interface Selection
  - contains
```
public boolean contains(int i)
```
    Returns true if the index i is selected in this object
    
    Specified by:
    
    contains in interface Selection
  - addRange
```
public Selection addRange(int start,
                          int end)
```
    Adds to the current bitmap all integers in [rangeStart,rangeEnd)
    
    Specified by:
    
    addRange in interface Selection
    
    Parameters:
    
    start - inclusive beginning of range
    
    end - exclusive ending of range
  - get
```
public int get(int indexToFind)
```
    Returns the value of the ith element. For example, if there are three ints {4, 32, 71} in the selection, get(0) returns 4, get(1) returns 32, and get(2) returns 71
    It can be useful if you need to iterate over the data, although there is also an iterator
    
    Specified by:
    
    get in interface Selection
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - iterator
```
public it.unimi.dsi.fastutil.ints.IntIterator iterator()
```
    Returns a fastUtil intIterator that wraps a bitmap intIterator
    
    Specified by:
    
    iterator in interface it.unimi.dsi.fastutil.ints.IntIterable
    
    Specified by:
    
    iterator in interface Iterable<Integer>
  - with
```
public static BitSetBackedSelection with(int... rows)
```
    Returns a Selection containing all indexes in the array
  - withRange
```
public static BitSetBackedSelection withRange(int start,
                                              int end)
```
    Returns a Selection containing all indexes in the range start (inclusive) to end (exclusive),
  - withoutRange
```
protected static Selection withoutRange(int totalRangeStart,
                                        int totalRangeEnd,
                                        int excludedRangeStart,
                                        int excludedRangeEnd)
```
    Returns a Selection containing all values from totalRangeStart to totalRangeEnd, except for those in the range from excludedRangeStart to excludedRangeEnd. Start values are inclusive, end values exclusive.
  - selectNRowsAtRandom
```
protected static BitSetBackedSelection selectNRowsAtRandom(int n,
                                                           int max)
```
    Returns an randomly generated selection of size N where Max is the largest possible value

Class BitSetBackedSelection

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.ints.IntIterable

Constructor Detail

BitSetBackedSelection

BitSetBackedSelection

BitSetBackedSelection

BitSetBackedSelection

Method Detail

removeRange

flip

add

toString

size

toArray

and

or

andNot

isEmpty

clear

contains

addRange

get

equals

hashCode

iterator

with

withRange

withoutRange

selectNRowsAtRandom