org.apache.lucene.util
Class BitVector
java.lang.Object
org.apache.lucene.util.BitVector
public final class BitVector
extends java.lang.Object
Optimized implementation of a vector of bits. This is more-or-less like
java.util.BitSet, but also includes the following:
- a count() method, which efficiently computes the number of one bits;
- optimized read from and write to disk;
- inlinable get() method;
Version:
- Doug Cutting
void | clear(int bit) - Sets the value of
bit to zero.
|
int | count() - Returns the total number of one bits in this vector.
|
boolean | get(int bit) - Returns
true if bit is one and
false if it is zero.
|
void | set(int bit) - Sets the value of
bit to one.
|
int | size() - Returns the number of bits in this vector.
|
void | write(Directory d, String name) - Writes this vector to the file
name in Directory
d , in a format that can be read by the constructor BitVector(Directory,String) .
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BitVector
public BitVector(int n)
Constructs a vector capable of holding n
bits.
BitVector
public BitVector(Directory d,
String name)
throws IOException
clear
public final void clear(int bit)
Sets the value of bit
to zero.
count
public final int count()
Returns the total number of one bits in this vector. This is efficiently
computed and cached, so that, if the vector is not changed, no
recomputation is done for repeated calls.
get
public final boolean get(int bit)
Returns true
if bit
is one and
false
if it is zero.
set
public final void set(int bit)
Sets the value of bit
to one.
size
public final int size()
Returns the number of bits in this vector. This is also one greater than
the number of the largest valid bit number.
write
public final void write(Directory d,
String name)
throws IOException
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