public class DoubleLinkedOpenHashSet extends AbstractDoubleSortedSet implements java.io.Serializable, java.lang.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.
Iterators generated by this set will enumerate elements in the same order in which they have been added to the set (addition of elements already present in the set does not change the iteration order). Note that this order has nothing in common with the natural order of the keys. The order is kept by means of a doubly linked list, represented via an array of longs parallel to the table.
This class implements the interface of a sorted set, so to allow easy
access of the iteration order: for instance, you can get the first element
in iteration order with first() without having to create an
iterator; however, this class partially violates the SortedSet
contract because all subset methods throw an exception and comparator() returns always null.
Additional methods, such as addAndMoveToFirst(), make it easy
to use instances of this class as a cache (e.g., with LRU policy).
The iterators provided by this class are type-specific list iterators, and can be started at any
element which is in the set (if the provided element
is not in the set, a NoSuchElementException exception will be thrown).
If, however, the provided element is not the first or last element in the
set, the first access to the list index will require linear time, as in the worst case
the entire set must be scanned in iteration order to retrieve the positional
index of the starting element. If you use just the methods of a type-specific BidirectionalIterator,
however, all operations will be performed in constant time.
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 |
|---|
DoubleLinkedOpenHashSet()
Creates a new hash set with initial expected
Hash.DEFAULT_INITIAL_SIZE elements
and Hash.DEFAULT_LOAD_FACTOR as load factor. |
DoubleLinkedOpenHashSet(java.util.Collection<? extends java.lang.Double> c)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor
copying a given collection. |
DoubleLinkedOpenHashSet(java.util.Collection<? extends java.lang.Double> c,
float f)
Creates a new hash set copying a given collection.
|
DoubleLinkedOpenHashSet(double[] a)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor
copying the elements of an array. |
DoubleLinkedOpenHashSet(double[] a,
float f)
Creates a new hash set copying the elements of an array.
|
DoubleLinkedOpenHashSet(double[] a,
int offset,
int length)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor and fills it with the elements of a given array. |
DoubleLinkedOpenHashSet(double[] a,
int offset,
int length,
float f)
Creates a new hash set and fills it with the elements of a given array.
|
DoubleLinkedOpenHashSet(DoubleCollection c)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor
copying a given type-specific collection. |
DoubleLinkedOpenHashSet(DoubleCollection c,
float f)
Creates a new hash set copying a given type-specific collection.
|
DoubleLinkedOpenHashSet(DoubleIterator i)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by a type-specific iterator. |
DoubleLinkedOpenHashSet(DoubleIterator i,
float f)
Creates a new hash set using elements provided by a type-specific iterator.
|
DoubleLinkedOpenHashSet(int expected)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor. |
DoubleLinkedOpenHashSet(int expected,
float f)
Creates a new hash set.
|
DoubleLinkedOpenHashSet(java.util.Iterator<?> i)
Creates a new hash set with
Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by an iterator. |
DoubleLinkedOpenHashSet(java.util.Iterator<?> i,
float f)
Creates a new hash set using elements provided by an iterator.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(double k) |
boolean |
addAll(java.util.Collection<? extends java.lang.Double> c)
Adds all elements of the given collection to this collection.
|
boolean |
addAll(DoubleCollection c)
Adds all elements of the given type-specific collection to this collection.
|
boolean |
addAndMoveToFirst(double k)
Adds a key to the set; if the key is already present, it is moved to the first position of the iteration order.
|
boolean |
addAndMoveToLast(double k)
Adds a key to the set; if the key is already present, it is moved to the last position of the iteration order.
|
void |
clear() |
DoubleLinkedOpenHashSet |
clone()
Returns a deep copy of this set.
|
DoubleComparator |
comparator()
Returns the comparator associated with this sorted set, or null if it uses its elements' natural ordering.
|
boolean |
contains(double k) |
double |
firstDouble()
Returns the first element of this set in iteration order.
|
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.
|
DoubleSortedSet |
headSet(double to) |
boolean |
isEmpty() |
DoubleListIterator |
iterator()
Returns a type-specific iterator on the elements of this collection.
|
DoubleListIterator |
iterator(double from)
Returns a type-specific list iterator on the elements in this set, starting from a given element of the set.
|
double |
lastDouble()
Returns the last element of this set in iteration order.
|
boolean |
rehash()
Deprecated.
A no-op.
|
boolean |
remove(double k)
Removes an element from this set.
|
double |
removeFirstDouble()
Removes the first key in iteration order.
|
double |
removeLastDouble()
Removes the the last key in iteration order.
|
int |
size() |
DoubleSortedSet |
subSet(double from,
double to) |
DoubleSortedSet |
tailSet(double from) |
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.
|
doubleIterator, first, headSet, last, subSet, tailSetequals, removeadd, contains, containsAll, containsAll, rem, rem, removeAll, removeAll, retainAll, retainAll, toArray, toArray, toArray, toDoubleArray, toDoubleArray, toStringcontainsAll, rem, removeAll, retainAll, toArray, toArray, toDoubleArray, toDoubleArraypublic DoubleLinkedOpenHashSet(int 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 hash set.f - the load factor.public DoubleLinkedOpenHashSet(int expected)
Hash.DEFAULT_LOAD_FACTOR as load factor.expected - the expected number of elements in the hash set.public DoubleLinkedOpenHashSet()
Hash.DEFAULT_INITIAL_SIZE elements
and Hash.DEFAULT_LOAD_FACTOR as load factor.public DoubleLinkedOpenHashSet(java.util.Collection<? extends java.lang.Double> c,
float f)
c - a Collection to be copied into the new hash set.f - the load factor.public DoubleLinkedOpenHashSet(java.util.Collection<? extends java.lang.Double> c)
Hash.DEFAULT_LOAD_FACTOR as load factor
copying a given collection.c - a Collection to be copied into the new hash set.public DoubleLinkedOpenHashSet(DoubleCollection c, float f)
c - a type-specific collection to be copied into the new hash set.f - the load factor.public DoubleLinkedOpenHashSet(DoubleCollection 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 set.public DoubleLinkedOpenHashSet(DoubleIterator i, float f)
i - a type-specific iterator whose elements will fill the set.f - the load factor.public DoubleLinkedOpenHashSet(DoubleIterator 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 set.public DoubleLinkedOpenHashSet(java.util.Iterator<?> i,
float f)
i - an iterator whose elements will fill the set.f - the load factor.public DoubleLinkedOpenHashSet(java.util.Iterator<?> i)
Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by an iterator.i - an iterator whose elements will fill the set.public DoubleLinkedOpenHashSet(double[] a,
int offset,
int length,
float f)
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.public DoubleLinkedOpenHashSet(double[] 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 set.offset - the first element to use.length - the number of elements to use.public DoubleLinkedOpenHashSet(double[] a,
float f)
a - an array to be copied into the new hash set.f - the load factor.public DoubleLinkedOpenHashSet(double[] a)
Hash.DEFAULT_LOAD_FACTOR as load factor
copying the elements of an array.a - an array to be copied into the new hash set.public boolean addAll(DoubleCollection c)
addAll in interface DoubleCollectionaddAll in class AbstractDoubleCollectionc - a type-specific collection.true if this collection changed as a result of the call.Collection.addAll(Collection)public boolean addAll(java.util.Collection<? extends java.lang.Double> c)
addAll in interface java.util.Collection<java.lang.Double>addAll in interface java.util.Set<java.lang.Double>addAll in class AbstractDoubleCollectionc - a collection.true if this collection changed as a result of the call.public boolean add(double k)
add in interface DoubleCollectionadd in class AbstractDoubleCollectionCollection.add(Object)public boolean remove(double k)
DoubleSetNote 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 DoubleSetremove in class AbstractDoubleSetCollection.remove(Object)public boolean contains(double k)
contains in interface DoubleCollectioncontains in class AbstractDoubleCollectionCollection.contains(Object)public double removeFirstDouble()
java.util.NoSuchElementException - is this set is empty.public double removeLastDouble()
java.util.NoSuchElementException - is this set is empty.public boolean addAndMoveToFirst(double k)
k - the key.public boolean addAndMoveToLast(double k)
k - the key.public void clear()
clear in interface java.util.Collection<java.lang.Double>clear in interface java.util.Set<java.lang.Double>clear in class java.util.AbstractCollection<java.lang.Double>public int size()
size in interface java.util.Collection<java.lang.Double>size in interface java.util.Set<java.lang.Double>size in class java.util.AbstractCollection<java.lang.Double>public boolean isEmpty()
isEmpty in interface java.util.Collection<java.lang.Double>isEmpty in interface java.util.Set<java.lang.Double>isEmpty in class AbstractDoubleCollection@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 double firstDouble()
firstDouble in interface DoubleSortedSetSortedSet.first()public double lastDouble()
lastDouble in interface DoubleSortedSetSortedSet.last()public DoubleSortedSet tailSet(double from)
tailSet in interface DoubleSortedSetSortedSet.tailSet(Object)public DoubleSortedSet headSet(double to)
headSet in interface DoubleSortedSetSortedSet.headSet(Object)public DoubleSortedSet subSet(double from, double to)
subSet in interface DoubleSortedSetSortedSet.subSet(Object,Object)public DoubleComparator comparator()
DoubleSortedSetNote that this specification strengthens the one given in SortedSet.comparator().
comparator in interface DoubleSortedSetcomparator in interface java.util.SortedSet<java.lang.Double>SortedSet.comparator()public DoubleListIterator iterator(double from)
iterator in interface DoubleSortedSetfrom - an element to start from.java.lang.IllegalArgumentException - if from does not belong to the set.public DoubleListIterator iterator()
DoubleCollectionNote 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 DoubleCollectioniterator in interface DoubleIterableiterator in interface DoubleSetiterator in interface DoubleSortedSetiterator in interface java.lang.Iterable<java.lang.Double>iterator in interface java.util.Collection<java.lang.Double>iterator in interface java.util.Set<java.lang.Double>iterator in class AbstractDoubleSortedSet@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 DoubleLinkedOpenHashSet 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.
clone in class java.lang.Objectpublic 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 java.util.Collection<java.lang.Double>hashCode in interface java.util.Set<java.lang.Double>hashCode in class AbstractDoubleSet