程序包 org.apache.pulsar.common.util.collections

类 BitSetRecyclable

java.lang.Object

org.apache.pulsar.common.util.collections.BitSetRecyclable

所有已实现的接口:

Serializable, Cloneable

public class BitSetRecyclable
extends Object
implements Cloneable, Serializable

This this copy of BitSet. Provides resetWords(long[]) method and leverage with netty recycler.

另请参阅:

• 序列化表格

构造器概要

构造器

构造器	说明
BitSetRecyclable()	Creates a new bit set.
BitSetRecyclable(int nbits)	Creates a bit set whose initial size is large enough to explicitly represent bits with indices in the range 0 through nbits-1.

方法概要

修饰符和类型	方法	说明
void	and(BitSetRecyclable set)	Performs a logical AND of this target bit set with the argument bit set.
void	andNot(BitSetRecyclable set)	Clears all of the bits in this BitSet whose corresponding bit is set in the specified BitSet.
int	cardinality()	Returns the number of bits set to true in this BitSet.
void	clear()	Sets all of the bits in this BitSet to false.
void	clear(int bitIndex)	Sets the bit specified by the index to false.
void	clear(int fromIndex, int toIndex)	Sets the bits from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to false.
Object	clone()	Cloning this BitSet produces a new BitSet that is equal to it.
static BitSetRecyclable	create()
boolean	equals(Object obj)	Compares this object against the specified object.
void	flip(int bitIndex)	Sets the bit at the specified index to the complement of its current value.
void	flip(int fromIndex, int toIndex)	Sets each bit from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to the complement of its current value.
boolean	get(int bitIndex)	Returns the value of the bit with the specified index.
BitSetRecyclable	get(int fromIndex, int toIndex)	Returns a new BitSet composed of bits from this BitSet from fromIndex (inclusive) to toIndex (exclusive).
int	hashCode()	Returns the hash code value for this bit set.
boolean	intersects(BitSetRecyclable set)	Returns true if the specified BitSet has any bits set to true that are also set to true in this BitSet.
boolean	isEmpty()	Returns true if this BitSet contains no bits that are set to true.
int	length()	Returns the "logical size" of this BitSet: the index of the highest set bit in the BitSet plus one.
int	nextClearBit(int fromIndex)	Returns the index of the first bit that is set to false that occurs on or after the specified starting index.
int	nextSetBit(int fromIndex)	Returns the index of the first bit that is set to true that occurs on or after the specified starting index.
void	or(BitSetRecyclable set)	Performs a logical OR of this bit set with the bit set argument.
int	previousClearBit(int fromIndex)	Returns the index of the nearest bit that is set to false that occurs on or before the specified starting index.
int	previousSetBit(int fromIndex)	Returns the index of the nearest bit that is set to true that occurs on or before the specified starting index.
void	recycle()
BitSetRecyclable	resetWords(long[] words)
void	set(int bitIndex)	Sets the bit at the specified index to true.
void	set(int bitIndex, boolean value)	Sets the bit at the specified index to the specified value.
void	set(int fromIndex, int toIndex)	Sets the bits from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to true.
void	set(int fromIndex, int toIndex, boolean value)	Sets the bits from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to the specified value.
int	size()	Returns the number of bits of space actually in use by this BitSet to represent bit values.
byte[]	toByteArray()	Returns a new byte array containing all the bits in this bit set.
long[]	toLongArray()	Returns a new long array containing all the bits in this bit set.
String	toString()	Returns a string representation of this bit set.
static BitSetRecyclable	valueOf(byte[] bytes)	Returns a new bit set containing all the bits in the given byte array.
static BitSetRecyclable	valueOf(long[] longs)	Returns a new bit set containing all the bits in the given long array.
static BitSetRecyclable	valueOf(ByteBuffer bb)	Returns a new bit set containing all the bits in the given byte buffer between its position and limit.
static BitSetRecyclable	valueOf(LongBuffer lb)	Returns a new bit set containing all the bits in the given long buffer between its position and limit.
static BitSetRecyclable	valueOf(BitSetRecyclable src)	Copy a BitSetRecyclable.
void	xor(BitSetRecyclable set)	Performs a logical XOR of this bit set with the bit set argument.

从类继承的方法 java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

BitSetRecyclable

public BitSetRecyclable()

Creates a new bit set. All bits are initially false.

BitSetRecyclable

public BitSetRecyclable(int nbits)

Creates a bit set whose initial size is large enough to explicitly represent bits with indices in the range 0 through nbits-1. All bits are initially false.

参数:

nbits - the initial size of the bit set

抛出:

NegativeArraySizeException - if the specified initial size is negative

方法详细资料

valueOf

public static BitSetRecyclable valueOf(long[] longs)

Returns a new bit set containing all the bits in the given long array.

More precisely,
BitSet.valueOf(longs).get(n) == ((longs[n/64] & (1L<<(n%64))) != 0)
for all n < 64 * longs.length.

This method is equivalent to BitSet.valueOf(LongBuffer.wrap(longs)).

参数:

longs - a long array containing a little-endian representation of a sequence of bits to be used as the initial bits of the new bit set

返回:

a BitSet containing all the bits in the long array

从以下版本开始:

1.7

valueOf

public static BitSetRecyclable valueOf(LongBuffer lb)

Returns a new bit set containing all the bits in the given long buffer between its position and limit.

More precisely,
BitSet.valueOf(lb).get(n) == ((lb.get(lb.position()+n/64) & (1L<<(n%64))) != 0)
for all n < 64 * lb.remaining().

The long buffer is not modified by this method, and no reference to the buffer is retained by the bit set.

参数:

lb - a long buffer containing a little-endian representation of a sequence of bits between its position and limit, to be used as the initial bits of the new bit set

返回:

a BitSet containing all the bits in the buffer in the specified range

从以下版本开始:

1.7

valueOf

public static BitSetRecyclable valueOf(byte[] bytes)

Returns a new bit set containing all the bits in the given byte array.

More precisely,
BitSet.valueOf(bytes).get(n) == ((bytes[n/8] & (1<<(n%8))) != 0)
for all n < 8 * bytes.length.

This method is equivalent to BitSet.valueOf(ByteBuffer.wrap(bytes)).

参数:

bytes - a byte array containing a little-endian representation of a sequence of bits to be used as the initial bits of the new bit set

返回:

a BitSet containing all the bits in the byte array

从以下版本开始:

1.7

valueOf

public static BitSetRecyclable valueOf(BitSetRecyclable src)

Copy a BitSetRecyclable.

valueOf

public static BitSetRecyclable valueOf(ByteBuffer bb)

Returns a new bit set containing all the bits in the given byte buffer between its position and limit.

More precisely,
BitSet.valueOf(bb).get(n) == ((bb.get(bb.position()+n/8) & (1<<(n%8))) != 0)
for all n < 8 * bb.remaining().

The byte buffer is not modified by this method, and no reference to the buffer is retained by the bit set.

参数:

bb - a byte buffer containing a little-endian representation of a sequence of bits between its position and limit, to be used as the initial bits of the new bit set

返回:

a BitSet containing all the bits in the buffer in the specified range

从以下版本开始:

1.7

toByteArray

public byte[] toByteArray()

Returns a new byte array containing all the bits in this bit set.

More precisely, if
byte[] bytes = s.toByteArray();
then bytes.length == (s.length()+7)/8 and
s.get(n) == ((bytes[n/8] & (1<<(n%8))) != 0)
for all n < 8 * bytes.length.

返回:

a byte array containing a little-endian representation of all the bits in this bit set

从以下版本开始:

1.7

toLongArray

public long[] toLongArray()

Returns a new long array containing all the bits in this bit set.

More precisely, if
long[] longs = s.toLongArray();
then longs.length == (s.length()+63)/64 and
s.get(n) == ((longs[n/64] & (1L<<(n%64))) != 0)
for all n < 64 * longs.length.

返回:

a long array containing a little-endian representation of all the bits in this bit set

从以下版本开始:

1.7

flip

public void flip(int bitIndex)

Sets the bit at the specified index to the complement of its current value.

参数:

bitIndex - the index of the bit to flip

抛出:

IndexOutOfBoundsException - if the specified index is negative

从以下版本开始:

1.4

flip

public void flip(int fromIndex,
 int toIndex)

Sets each bit from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to the complement of its current value.

参数:

fromIndex - index of the first bit to flip

toIndex - index after the last bit to flip

抛出:

IndexOutOfBoundsException - if fromIndex is negative, or toIndex is negative, or fromIndex is larger than toIndex

从以下版本开始:

1.4

set

public void set(int bitIndex)

Sets the bit at the specified index to true.

参数:

bitIndex - a bit index

抛出:

IndexOutOfBoundsException - if the specified index is negative

从以下版本开始:

JDK1.0

set

public void set(int bitIndex,
 boolean value)

Sets the bit at the specified index to the specified value.

参数:

bitIndex - a bit index

value - a boolean value to set

抛出:

IndexOutOfBoundsException - if the specified index is negative

从以下版本开始:

1.4

set

public void set(int fromIndex,
 int toIndex)

Sets the bits from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to true.

参数:

fromIndex - index of the first bit to be set

toIndex - index after the last bit to be set

抛出:

IndexOutOfBoundsException - if fromIndex is negative, or toIndex is negative, or fromIndex is larger than toIndex

从以下版本开始:

1.4

set

public void set(int fromIndex,
 int toIndex,
 boolean value)

Sets the bits from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to the specified value.

参数:

fromIndex - index of the first bit to be set

toIndex - index after the last bit to be set

value - value to set the selected bits to

抛出:

IndexOutOfBoundsException - if fromIndex is negative, or toIndex is negative, or fromIndex is larger than toIndex

从以下版本开始:

1.4

clear

public void clear(int bitIndex)

Sets the bit specified by the index to false.

参数:

bitIndex - the index of the bit to be cleared

抛出:

IndexOutOfBoundsException - if the specified index is negative

从以下版本开始:

JDK1.0

clear

public void clear(int fromIndex,
 int toIndex)

Sets the bits from the specified fromIndex (inclusive) to the specified toIndex (exclusive) to false.

参数:

fromIndex - index of the first bit to be cleared

toIndex - index after the last bit to be cleared

抛出:

IndexOutOfBoundsException - if fromIndex is negative, or toIndex is negative, or fromIndex is larger than toIndex

从以下版本开始:

1.4

clear

public void clear()

Sets all of the bits in this BitSet to false.

从以下版本开始:

1.4

get

public boolean get(int bitIndex)

Returns the value of the bit with the specified index. The value is true if the bit with the index bitIndex is currently set in this BitSet; otherwise, the result is false.

参数:

bitIndex - the bit index

返回:

the value of the bit with the specified index

抛出:

IndexOutOfBoundsException - if the specified index is negative

get

public BitSetRecyclable get(int fromIndex,
 int toIndex)

Returns a new BitSet composed of bits from this BitSet from fromIndex (inclusive) to toIndex (exclusive).

参数:

fromIndex - index of the first bit to include

toIndex - index after the last bit to include

返回:

a new BitSet from a range of this BitSet

抛出:

IndexOutOfBoundsException - if fromIndex is negative, or toIndex is negative, or fromIndex is larger than toIndex

从以下版本开始:

1.4

nextSetBit

public int nextSetBit(int fromIndex)

Returns the index of the first bit that is set to true that occurs on or after the specified starting index. If no such bit exists then -1 is returned.

To iterate over the true bits in a BitSet, use the following loop:

 
 for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i+1)) {
     // operate on index i here
     if (i == Integer.MAX_VALUE) {
         break; // or (i+1) would overflow
     }
 }

参数:

fromIndex - the index to start checking from (inclusive)

返回:

the index of the next set bit, or -1 if there is no such bit

抛出:

IndexOutOfBoundsException - if the specified index is negative

从以下版本开始:

1.4

nextClearBit

public int nextClearBit(int fromIndex)

Returns the index of the first bit that is set to false that occurs on or after the specified starting index.

参数:

fromIndex - the index to start checking from (inclusive)

返回:

the index of the next clear bit

抛出:

IndexOutOfBoundsException - if the specified index is negative

从以下版本开始:

1.4

previousSetBit

public int previousSetBit(int fromIndex)

Returns the index of the nearest bit that is set to true that occurs on or before the specified starting index. If no such bit exists, or if -1 is given as the starting index, then -1 is returned.

To iterate over the true bits in a BitSet, use the following loop:

 
 for (int i = bs.length(); (i = bs.previousSetBit(i-1)) >= 0; ) {
     // operate on index i here
 }

参数:

fromIndex - the index to start checking from (inclusive)

返回:

the index of the previous set bit, or -1 if there is no such bit

抛出:

IndexOutOfBoundsException - if the specified index is less than -1

从以下版本开始:

1.7

previousClearBit

public int previousClearBit(int fromIndex)

Returns the index of the nearest bit that is set to false that occurs on or before the specified starting index. If no such bit exists, or if -1 is given as the starting index, then -1 is returned.

参数:

fromIndex - the index to start checking from (inclusive)

返回:

the index of the previous clear bit, or -1 if there is no such bit

抛出:

IndexOutOfBoundsException - if the specified index is less than -1

从以下版本开始:

1.7

length

public int length()

Returns the "logical size" of this BitSet: the index of the highest set bit in the BitSet plus one. Returns zero if the BitSet contains no set bits.

返回:

the logical size of this BitSet

从以下版本开始:

1.2

isEmpty

public boolean isEmpty()

Returns true if this BitSet contains no bits that are set to true.

返回:

boolean indicating whether this BitSet is empty

从以下版本开始:

1.4

intersects

public boolean intersects(BitSetRecyclable set)

Returns true if the specified BitSet has any bits set to true that are also set to true in this BitSet.

参数:

set - BitSet to intersect with

返回:

boolean indicating whether this BitSet intersects the specified BitSet

从以下版本开始:

1.4

cardinality

public int cardinality()

Returns the number of bits set to true in this BitSet.

返回:

the number of bits set to true in this BitSet

从以下版本开始:

1.4

and

public void and(BitSetRecyclable set)

Performs a logical AND of this target bit set with the argument bit set. This bit set is modified so that each bit in it has the value true if and only if it both initially had the value true and the corresponding bit in the bit set argument also had the value true.

参数:

set - a bit set

or

public void or(BitSetRecyclable set)

Performs a logical OR of this bit set with the bit set argument. This bit set is modified so that a bit in it has the value true if and only if it either already had the value true or the corresponding bit in the bit set argument has the value true.

参数:

set - a bit set

xor

public void xor(BitSetRecyclable set)

Performs a logical XOR of this bit set with the bit set argument. This bit set is modified so that a bit in it has the value true if and only if one of the following statements holds:

• The bit initially has the value true, and the corresponding bit in the argument has the value false.
• The bit initially has the value false, and the corresponding bit in the argument has the value true.

参数:

set - a bit set

andNot

public void andNot(BitSetRecyclable set)

Clears all of the bits in this BitSet whose corresponding bit is set in the specified BitSet.

参数:

set - the BitSet with which to mask this BitSet

从以下版本开始:

1.2

hashCode

public int hashCode()

Returns the hash code value for this bit set. The hash code depends only on which bits are set within this BitSet.

The hash code is defined to be the result of the following calculation:

 
 public int hashCode() {
     long h = 1234;
     long[] words = toLongArray();
     for (int i = words.length; --i >= 0; )
         h ^= words[i] * (i + 1);
     return (int)((h >> 32) ^ h);
 }

Note that the hash code changes if the set of bits is altered.

覆盖:

hashCode 在类中 Object

返回:

the hash code value for this bit set

size

public int size()

Returns the number of bits of space actually in use by this BitSet to represent bit values. The maximum element in the set is the size - 1st element.

返回:

the number of bits currently in this bit set

equals

public boolean equals(Object obj)

Compares this object against the specified object. The result is true if and only if the argument is not null and is a Bitset object that has exactly the same set of bits set to true as this bit set. That is, for every nonnegative int index k,

((BitSet)obj).get(k) == this.get(k)

must be true. The current sizes of the two bit sets are not compared.

覆盖:

equals 在类中 Object

参数:

obj - the object to compare with

返回:

true if the objects are the same; false otherwise

另请参阅:

• size()

clone

public Object clone()

Cloning this BitSet produces a new BitSet that is equal to it. The clone of the bit set is another bit set that has exactly the same bits set to true as this bit set.

覆盖:

clone 在类中 Object

返回:

a clone of this bit set

另请参阅:

• size()

toString

public String toString()

Returns a string representation of this bit set. For every index for which this BitSet contains a bit in the set state, the decimal representation of that index is included in the result. Such indices are listed in order from lowest to highest, separated by ", " (a comma and a space) and surrounded by braces, resulting in the usual mathematical notation for a set of integers.

Example:

 BitSet drPepper = new BitSet();

Now drPepper.toString() returns "{}".

 drPepper.set(2);

Now drPepper.toString() returns "{2}".

 drPepper.set(4);
 drPepper.set(10);

Now drPepper.toString() returns "{2, 4, 10}".

覆盖:

toString 在类中 Object

返回:

a string representation of this bit set

resetWords

public BitSetRecyclable resetWords(long[] words)

create

public static BitSetRecyclable create()

recycle

public void recycle()