org.roaringbitmap.buffer

Class ImmutableRoaringArray

java.lang.Object

org.roaringbitmap.buffer.ImmutableRoaringArray

All Implemented Interfaces:

Cloneable, PointableRoaringArray

public final class ImmutableRoaringArray
extends Object
implements PointableRoaringArray

This is the underlying data structure for an ImmutableRoaringBitmap. This class is not meant for end-users.

Field Summary

Fields

Modifier and Type	Field and Description
protected static short	SERIAL_COOKIE
protected static short	SERIAL_COOKIE_NO_RUNCONTAINER

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ImmutableRoaringArray(ByteBuffer bbf) Create an array based on a previously serialized ByteBuffer.

Method Summary

Modifier and Type	Method and Description
int	advanceUntil(short x, int pos) Find the smallest integer index larger than pos such that getKeyAtIndex(index)>=x.
ImmutableRoaringArray	clone() Create an independent copy of the underlying array
boolean	containsForContainerAtIndex(int i, short x) This checks whether the container at index i has the value x.
int	first() Gets the first value in the array
int	getCardinality(int k) Returns the cardinality of the container at the given index.
MappeableContainer	getContainerAtIndex(int i)
int	getContainerIndex(short x) Returns either the index of the container corresponding to key x, or a negative value.
MappeableContainerPointer	getContainerPointer()
MappeableContainerPointer	getContainerPointer(int startIndex)
int	getIndex(short x)
short	getKeyAtIndex(int i)
int	hashCode()
boolean	hasRunCompression() Check whether this bitmap has had its runs compressed.
protected int	headerSize(boolean hasrun)
boolean	isEmpty() Returns true if this bitmap is empty.
int	last() Gets the last value in the array
void	serialize(DataOutput out) Serialize.
int	serializedSizeInBytes()
int	size()

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

SERIAL_COOKIE

protected static final short SERIAL_COOKIE

See Also:

Constant Field Values

SERIAL_COOKIE_NO_RUNCONTAINER

protected static final short SERIAL_COOKIE_NO_RUNCONTAINER

See Also:

Constant Field Values

Constructor Detail

ImmutableRoaringArray

protected ImmutableRoaringArray(ByteBuffer bbf)

Create an array based on a previously serialized ByteBuffer. The input ByteBuffer is effectively copied (with the slice operation) so you should expect the provided ByteBuffer to remain unchanged.

Parameters:

bbf - The source ByteBuffer

Method Detail

advanceUntil

public int advanceUntil(short x,
                        int pos)

Description copied from interface: PointableRoaringArray

Find the smallest integer index larger than pos such that getKeyAtIndex(index)>=x. If none can be found, return size.

Specified by:

advanceUntil in interface PointableRoaringArray

Parameters:

x - minimal value

pos - index to exceed

Returns:

the smallest index greater than pos such that getKeyAtIndex(index) is at least as large as min, or size if it is not possible.

clone

public ImmutableRoaringArray clone()

Description copied from interface: PointableRoaringArray

Create an independent copy of the underlying array

Specified by:

clone in interface PointableRoaringArray

Overrides:

clone in class Object

Returns:

a copy

getCardinality

public int getCardinality(int k)

Description copied from interface: PointableRoaringArray

Returns the cardinality of the container at the given index. This method is expected to be fast.

Specified by:

getCardinality in interface PointableRoaringArray

Parameters:

k - index

Returns:

the cardinality

getContainerIndex

public int getContainerIndex(short x)

Description copied from interface: PointableRoaringArray

Returns either the index of the container corresponding to key x, or a negative value.

Specified by:

getContainerIndex in interface PointableRoaringArray

Parameters:

x - 16-bit key

Returns:

index of container (negative value if no container found)

getContainerAtIndex

public MappeableContainer getContainerAtIndex(int i)

Specified by:

getContainerAtIndex in interface PointableRoaringArray

Parameters:

i - index

Returns:

matching container

containsForContainerAtIndex

public boolean containsForContainerAtIndex(int i,
                                           short x)

Description copied from interface: PointableRoaringArray

This checks whether the container at index i has the value x. This can be faster than calling "getContainerAtIndex" and then calling contains.

Specified by:

containsForContainerAtIndex in interface PointableRoaringArray

Parameters:

i - container index (assumed to be non-negative)

x - 16-bit value to check

Returns:

whether the container contains at index i contains x

getContainerPointer

public MappeableContainerPointer getContainerPointer()

Specified by:

getContainerPointer in interface PointableRoaringArray

Returns:

a ContainerPointer to iterator over the array

getContainerPointer

public MappeableContainerPointer getContainerPointer(int startIndex)

Specified by:

getContainerPointer in interface PointableRoaringArray

Parameters:

startIndex - starting index

Returns:

a ContainerPointer to iterator over the array initially positioned at startIndex

getIndex

public int getIndex(short x)

Specified by:

getIndex in interface PointableRoaringArray

Parameters:

x - 16-bit key

Returns:

corresponding index

getKeyAtIndex

public short getKeyAtIndex(int i)

Specified by:

getKeyAtIndex in interface PointableRoaringArray

Parameters:

i - the index

Returns:

16-bit key at the index

hashCode

public int hashCode()

Overrides:

hashCode in class Object

hasRunCompression

public boolean hasRunCompression()

Description copied from interface: PointableRoaringArray

Check whether this bitmap has had its runs compressed.

Specified by:

hasRunCompression in interface PointableRoaringArray

Returns:

whether this bitmap has run compression

headerSize

protected int headerSize(boolean hasrun)

isEmpty

public boolean isEmpty()

Returns true if this bitmap is empty.

Returns:

true if empty

serialize

public void serialize(DataOutput out)
               throws IOException

Serialize. The current bitmap is not modified.

Specified by:

serialize in interface PointableRoaringArray

Parameters:

out - the DataOutput stream

Throws:

IOException - Signals that an I/O exception has occurred.

serializedSizeInBytes

public int serializedSizeInBytes()

Specified by:

serializedSizeInBytes in interface PointableRoaringArray

Returns:

the size that the data structure occupies on disk

size

public int size()

Specified by:

size in interface PointableRoaringArray

Returns:

number of keys

first

public int first()

Description copied from interface: PointableRoaringArray

Gets the first value in the array

Specified by:

first in interface PointableRoaringArray

Returns:

te first value in the array

last

public int last()

Description copied from interface: PointableRoaringArray

Gets the last value in the array

Specified by:

last in interface PointableRoaringArray

Returns:

te last value in the array