public class ObjectOpenHashBigSet<K> extends AbstractObjectSet<K> implements Serializable, Cloneable, Hash, Size64
Instances of this class use a hash table to represent a big set: the number of elements in the set is limited only by the amount of core memory. The table (backed by a big array) 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.
The methods of this class are about 30% slower than those of the corresponding non-big set.
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 |
|---|
ObjectOpenHashBigSet()
Creates a new hash big set with initial expected
Hash.DEFAULT_INITIAL_SIZE elements and
Hash.DEFAULT_LOAD_FACTOR as load factor. |
ObjectOpenHashBigSet(Collection<? extends K> c)
Creates a new hash big set with
Hash.DEFAULT_LOAD_FACTOR as load
factor copying a given collection. |
ObjectOpenHashBigSet(Collection<? extends K> c,
float f)
Creates a new hash big set copying a given collection.
|
ObjectOpenHashBigSet(Iterator<? extends K> i)
Creates a new hash big set with
Hash.DEFAULT_LOAD_FACTOR as load
factor using elements provided by a type-specific iterator. |
ObjectOpenHashBigSet(Iterator<? extends K> i,
float f)
Creates a new hash big set using elements provided by a type-specific
iterator.
|
ObjectOpenHashBigSet(K[] a)
Creates a new hash big set with
Hash.DEFAULT_LOAD_FACTOR as load
factor copying the elements of an array. |
ObjectOpenHashBigSet(K[] a,
float f)
Creates a new hash big set copying the elements of an array.
|
ObjectOpenHashBigSet(K[] a,
int offset,
int length)
Creates a new hash big set with
Hash.DEFAULT_LOAD_FACTOR as load
factor and fills it with the elements of a given array. |
ObjectOpenHashBigSet(K[] a,
int offset,
int length,
float f)
Creates a new hash big set and fills it with the elements of a given
array.
|
ObjectOpenHashBigSet(long expected)
Creates a new hash big set with
Hash.DEFAULT_LOAD_FACTOR as load
factor. |
ObjectOpenHashBigSet(long expected,
float f)
Creates a new hash big set.
|
ObjectOpenHashBigSet(ObjectCollection<? extends K> c)
Creates a new hash big set with
Hash.DEFAULT_LOAD_FACTOR as load
factor copying a given type-specific collection. |
ObjectOpenHashBigSet(ObjectCollection<? extends K> c,
float f)
Creates a new hash big set copying a given type-specific collection.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(K k) |
boolean |
addAll(Collection<? extends K> c)
Adds all elements of the given collection to this collection.
|
K |
addOrGet(K k)
Add a random element if not present, get the existing value if already
present.
|
void |
clear() |
ObjectOpenHashBigSet<K> |
clone()
Returns a deep copy of this big set.
|
boolean |
contains(Object k) |
K |
get(Object k)
Returns the element of this set that is equal to the given key, or
null. |
int |
hashCode()
Returns a hash code for this set.
|
boolean |
isEmpty() |
ObjectIterator<K> |
iterator()
Returns a type-specific iterator on the elements of this collection.
|
boolean |
rehash()
Deprecated.
A no-op.
|
boolean |
rem(Object k) |
int |
size()
Deprecated.
|
long |
size64()
Returns the size of this data structure as a long.
|
boolean |
trim()
Rehashes this set, making the table as small as possible.
|
boolean |
trim(long n)
Rehashes this set if the table is too large.
|
equalscontainsAll, objectIterator, remove, removeAll, retainAll, toArray, toArray, toStringobjectIterator, toArraycontainsAll, removeAll, retainAll, spliterator, toArray, toArrayparallelStream, removeIf, streampublic ObjectOpenHashBigSet(long expected,
float f)
The actual table size will be the least power of two greater than
expected/f.
expected - the expected number of elements in the set.f - the load factor.public ObjectOpenHashBigSet(long expected)
Hash.DEFAULT_LOAD_FACTOR as load
factor.expected - the expected number of elements in the hash big set.public ObjectOpenHashBigSet()
Hash.DEFAULT_INITIAL_SIZE elements and
Hash.DEFAULT_LOAD_FACTOR as load factor.public ObjectOpenHashBigSet(Collection<? extends K> c, float f)
c - a Collection to be copied into the new hash big set.f - the load factor.public ObjectOpenHashBigSet(Collection<? extends K> c)
Hash.DEFAULT_LOAD_FACTOR as load
factor copying a given collection.c - a Collection to be copied into the new hash big set.public ObjectOpenHashBigSet(ObjectCollection<? extends K> c, float f)
c - a type-specific collection to be copied into the new hash big
set.f - the load factor.public ObjectOpenHashBigSet(ObjectCollection<? extends K> c)
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 big
set.public ObjectOpenHashBigSet(Iterator<? extends K> i, float f)
i - a type-specific iterator whose elements will fill the new hash
big set.f - the load factor.public ObjectOpenHashBigSet(Iterator<? extends K> i)
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 new hash
big set.public ObjectOpenHashBigSet(K[] a, int offset, int length, float f)
a - an array whose elements will be used to fill the new hash big
set.offset - the first element to use.length - the number of elements to use.f - the load factor.public ObjectOpenHashBigSet(K[] a, int offset, int length)
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 new hash big
set.offset - the first element to use.length - the number of elements to use.public ObjectOpenHashBigSet(K[] a, float f)
a - an array to be copied into the new hash big set.f - the load factor.public ObjectOpenHashBigSet(K[] a)
Hash.DEFAULT_LOAD_FACTOR as load
factor copying the elements of an array.a - an array to be copied into the new hash big set.public boolean addAll(Collection<? extends K> c)
addAll in interface Collection<K>addAll in interface Set<K>addAll in class AbstractObjectCollection<K>c - a collection.true if this collection changed as a result of the
call.public boolean add(K k)
add in interface Collection<K>add in interface Set<K>add in class AbstractObjectCollection<K>public K addOrGet(K k)
K exist = set.get(k);
if (exist == null) {
set.add(k);
exist = k;
}
public boolean rem(Object k)
rem in class AbstractObjectCollection<K>public boolean contains(Object k)
contains in interface Collection<K>contains in interface Set<K>contains in class AbstractCollection<K>public K get(Object k)
null.null.public void clear()
clear in interface Collection<K>clear in interface Set<K>clear in class AbstractCollection<K>public ObjectIterator<K> iterator()
ObjectCollection
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 ObjectCollection<K>iterator in interface ObjectIterable<K>iterator in interface ObjectSet<K>iterator in interface Iterable<K>iterator in interface Collection<K>iterator in interface Set<K>iterator in class AbstractObjectSet<K>@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(long)public boolean trim(long 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.
size64())
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()@Deprecated public int size()
Size64Integer.MAX_VALUE.size in interface Size64size in interface Collection<K>size in interface Set<K>size in class AbstractCollection<K>Integer.MAX_VALUE.Collection.size()public long size64()
Size64public boolean isEmpty()
isEmpty in interface Collection<K>isEmpty in interface Set<K>isEmpty in class AbstractObjectCollection<K>public ObjectOpenHashBigSet<K> clone()
This method performs a deep copy of this big 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<K>hashCode in interface Set<K>hashCode in class AbstractObjectSet<K>