public class LongOpenCustomHashSet extends AbstractLongSet implements Serializable, Cloneable, Hash
Instances of this class use a hash table to represent a set. The table is filled up to a specified load factor, and then doubled in size to accommodate new entries. If the table is emptied below one fourth of the load factor, it is halved in size. However, halving is not performed when deleting entries from an iterator, as it would interfere with the iteration process.
Note that clear()
does not modify the hash table size.
Rather, a family of trimming
methods lets you control the size of the table; this is particularly useful
if you reuse instances of this class.
Hash
,
HashCommon
,
Serialized FormHash.Strategy<K>
DEFAULT_GROWTH_FACTOR, DEFAULT_INITIAL_SIZE, DEFAULT_LOAD_FACTOR, FAST_LOAD_FACTOR, FREE, OCCUPIED, PRIMES, REMOVED, VERY_FAST_LOAD_FACTOR
Constructor and Description |
---|
LongOpenCustomHashSet(Collection<? extends Long> c,
float f,
LongHash.Strategy strategy)
Creates a new hash set copying a given collection.
|
LongOpenCustomHashSet(Collection<? extends Long> c,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor
copying a given collection. |
LongOpenCustomHashSet(int expected,
float f,
LongHash.Strategy strategy)
Creates a new hash set.
|
LongOpenCustomHashSet(int expected,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor. |
LongOpenCustomHashSet(Iterator<?> i,
float f,
LongHash.Strategy strategy)
Creates a new hash set using elements provided by an iterator.
|
LongOpenCustomHashSet(Iterator<?> i,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by an iterator. |
LongOpenCustomHashSet(long[] a,
float f,
LongHash.Strategy strategy)
Creates a new hash set copying the elements of an array.
|
LongOpenCustomHashSet(long[] a,
int offset,
int length,
float f,
LongHash.Strategy strategy)
Creates a new hash set and fills it with the elements of a given array.
|
LongOpenCustomHashSet(long[] a,
int offset,
int length,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor and fills it with the elements of a given array. |
LongOpenCustomHashSet(long[] a,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor
copying the elements of an array. |
LongOpenCustomHashSet(LongCollection c,
float f,
LongHash.Strategy strategy)
Creates a new hash set copying a given type-specific collection.
|
LongOpenCustomHashSet(LongCollection c,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor
copying a given type-specific collection. |
LongOpenCustomHashSet(LongHash.Strategy strategy)
Creates a new hash set with initial expected
Hash.DEFAULT_INITIAL_SIZE elements
and Hash.DEFAULT_LOAD_FACTOR as load factor. |
LongOpenCustomHashSet(LongIterator i,
float f,
LongHash.Strategy strategy)
Creates a new hash set using elements provided by a type-specific iterator.
|
LongOpenCustomHashSet(LongIterator i,
LongHash.Strategy strategy)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by a type-specific iterator. |
Modifier and Type | Method and Description |
---|---|
boolean |
add(long k) |
boolean |
addAll(Collection<? extends Long> c)
Adds all elements of the given collection to this collection.
|
boolean |
addAll(LongCollection c)
Adds all elements of the given type-specific collection to this collection.
|
void |
clear() |
LongOpenCustomHashSet |
clone()
Returns a deep copy of this set.
|
boolean |
contains(long k) |
int |
growthFactor()
Deprecated.
Since
fastutil 6.1.0, hash tables are doubled when they are too full. |
void |
growthFactor(int growthFactor)
Deprecated.
Since
fastutil 6.1.0, hash tables are doubled when they are too full. |
int |
hashCode()
Returns a hash code for this set.
|
boolean |
isEmpty() |
LongIterator |
iterator()
Returns a type-specific iterator on the elements of this collection.
|
boolean |
rehash()
Deprecated.
A no-op.
|
boolean |
remove(long k)
Removes an element from this set.
|
int |
size() |
LongHash.Strategy |
strategy()
Returns the hashing strategy.
|
boolean |
trim()
Rehashes this set, making the table as small as possible.
|
boolean |
trim(int n)
Rehashes this set if the table is too large.
|
equals, rem, remove
add, contains, containsAll, containsAll, longIterator, rem, removeAll, removeAll, retainAll, retainAll, toArray, toArray, toArray, toLongArray, toLongArray, toString
containsAll, longIterator, removeAll, retainAll, toArray, toArray, toLongArray, toLongArray
public LongOpenCustomHashSet(int expected, float f, LongHash.Strategy strategy)
The actual table size will be the least power of two greater than expected
/f
.
expected
- the expected number of elements in the hash set.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(int expected, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor.expected
- the expected number of elements in the hash set.strategy
- the strategy.public LongOpenCustomHashSet(LongHash.Strategy strategy)
Hash.DEFAULT_INITIAL_SIZE
elements
and Hash.DEFAULT_LOAD_FACTOR
as load factor.strategy
- the strategy.public LongOpenCustomHashSet(Collection<? extends Long> c, float f, LongHash.Strategy strategy)
c
- a Collection
to be copied into the new hash set.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(Collection<? extends Long> c, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor
copying a given collection.c
- a Collection
to be copied into the new hash set.strategy
- the strategy.public LongOpenCustomHashSet(LongCollection c, float f, LongHash.Strategy strategy)
c
- a type-specific collection to be copied into the new hash set.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(LongCollection c, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor
copying a given type-specific collection.c
- a type-specific collection to be copied into the new hash set.strategy
- the strategy.public LongOpenCustomHashSet(LongIterator i, float f, LongHash.Strategy strategy)
i
- a type-specific iterator whose elements will fill the set.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(LongIterator i, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor using elements provided by a type-specific iterator.i
- a type-specific iterator whose elements will fill the set.strategy
- the strategy.public LongOpenCustomHashSet(Iterator<?> i, float f, LongHash.Strategy strategy)
i
- an iterator whose elements will fill the set.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(Iterator<?> i, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor using elements provided by an iterator.i
- an iterator whose elements will fill the set.strategy
- the strategy.public LongOpenCustomHashSet(long[] a, int offset, int length, float f, LongHash.Strategy strategy)
a
- an array whose elements will be used to fill the set.offset
- the first element to use.length
- the number of elements to use.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(long[] a, int offset, int length, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor and fills it with the elements of a given array.a
- an array whose elements will be used to fill the set.offset
- the first element to use.length
- the number of elements to use.strategy
- the strategy.public LongOpenCustomHashSet(long[] a, float f, LongHash.Strategy strategy)
a
- an array to be copied into the new hash set.f
- the load factor.strategy
- the strategy.public LongOpenCustomHashSet(long[] a, LongHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor
copying the elements of an array.a
- an array to be copied into the new hash set.strategy
- the strategy.public LongHash.Strategy strategy()
public boolean addAll(LongCollection c)
addAll
in interface LongCollection
addAll
in class AbstractLongCollection
c
- a type-specific collection.true
if this collection changed as a result of the call.Collection.addAll(Collection)
public boolean addAll(Collection<? extends Long> c)
addAll
in interface Collection<Long>
addAll
in interface Set<Long>
addAll
in class AbstractLongCollection
c
- a collection.true
if this collection changed as a result of the call.public boolean add(long k)
add
in interface LongCollection
add
in class AbstractLongCollection
Collection.add(Object)
public boolean remove(long k)
LongSet
Note that the corresponding method of the type-specific collection is rem()
.
This unfortunate situation is caused by the clash
with the similarly named index-based method in the List
interface.
remove
in interface LongSet
remove
in class AbstractLongSet
Collection.remove(Object)
public boolean contains(long k)
contains
in interface LongCollection
contains
in class AbstractLongCollection
Collection.contains(Object)
public void clear()
clear
in interface Collection<Long>
clear
in interface Set<Long>
clear
in class AbstractCollection<Long>
public int size()
size
in interface Collection<Long>
size
in interface Set<Long>
size
in class AbstractCollection<Long>
public boolean isEmpty()
isEmpty
in interface Collection<Long>
isEmpty
in interface Set<Long>
isEmpty
in class AbstractLongCollection
@Deprecated public void growthFactor(int growthFactor)
fastutil
6.1.0, hash tables are doubled when they are too full.growthFactor
- unused.@Deprecated public int growthFactor()
fastutil
6.1.0, hash tables are doubled when they are too full.growthFactor(int)
public LongIterator iterator()
LongCollection
Note that this specification strengthens the one given in
Iterable.iterator()
, which was already
strengthened in the corresponding type-specific class,
but was weakened by the fact that this interface extends Collection
.
iterator
in interface LongCollection
iterator
in interface LongIterable
iterator
in interface LongSet
iterator
in interface Iterable<Long>
iterator
in interface Collection<Long>
iterator
in interface Set<Long>
iterator
in class AbstractLongSet
@Deprecated public boolean rehash()
If you need to reduce the table size to fit exactly
this set, use trim()
.
trim()
public boolean trim()
This method rehashes the table to the smallest size satisfying the load factor. It can be used when the set will not be changed anymore, so to optimize access speed and size.
If the table size is already the minimum possible, this method does nothing.
trim(int)
public boolean trim(int n)
Let N be the smallest table size that can hold
max(n,
entries, still satisfying the load factor. If the current
table size is smaller than or equal to N, this method does
nothing. Otherwise, it rehashes this set in a table of size
N.
size()
)
This method is useful when reusing sets. Clearing a set leaves the table size untouched. If you are reusing a set many times, you can call this method with a typical size to avoid keeping around a very large table just because of a few large transient sets.
n
- the threshold for the trimming.trim()
public LongOpenCustomHashSet clone()
This method performs a deep copy of this hash set; the data stored in the set, however, is not cloned. Note that this makes a difference only for object keys.
public int hashCode()
equals()
is not overriden, it is important
that the value returned by this method is the same value as
the one returned by the overriden method.hashCode
in interface Collection<Long>
hashCode
in interface Set<Long>
hashCode
in class AbstractLongSet