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java.lang.Objectit.unimi.dsi.fastutil.objects.AbstractObject2FloatFunction<K>
it.unimi.dsi.fastutil.objects.AbstractObject2FloatMap<K>
it.unimi.dsi.fastutil.objects.AbstractObject2FloatSortedMap<K>
it.unimi.dsi.fastutil.objects.Object2FloatLinkedOpenCustomHashMap<K>
public class Object2FloatLinkedOpenCustomHashMap<K>
A type-specific linked hash map with with a fast, small-footprint implementation.
Instances of this class use a hash table to represent a map. The table is
enlarged as needed by doubling its size when new entries are created, but it is never made
smaller (even on a clear()
). 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 map will enumerate pairs in the same order in which they have been added to the map (addition of pairs whose key is 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 map, so to allow easy
access of the iteration order: for instance, you can get the first key
in iteration order with firstKey()
without having to create an
iterator; however, this class partially violates the SortedMap
contract because all submap methods throw an exception and comparator()
returns always null
.
Additional methods, such as getAndMoveToFirst()
, make it easy
to use instances of this class as a cache (e.g., with LRU policy).
The iterators provided by the views of this class using are type-specific
list iterators, and can be started at any
element which is a key of the map, or
a NoSuchElementException
exception will be thrown.
If, however, the provided element is not the first or last key in the
set, the first access to the list index will require linear time, as in the worst case
the entire key set must be scanned in iteration order to retrieve the positional
index of the starting key. If you use just the methods of a type-specific BidirectionalIterator
,
however, all operations will be performed in constant time.
Hash
,
HashCommon
,
Serialized FormNested Class Summary |
---|
Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2FloatSortedMap |
---|
AbstractObject2FloatSortedMap.KeySetIterator<K>, AbstractObject2FloatSortedMap.ValuesCollection, AbstractObject2FloatSortedMap.ValuesIterator<K> |
Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2FloatMap |
---|
AbstractObject2FloatMap.BasicEntry<K> |
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.Hash |
---|
Hash.Strategy<K> |
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Object2FloatSortedMap |
---|
Object2FloatSortedMap.FastSortedEntrySet<K> |
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Object2FloatMap |
---|
Object2FloatMap.Entry<K>, Object2FloatMap.FastEntrySet<K> |
Field Summary | |
---|---|
protected Object2FloatSortedMap.FastSortedEntrySet<K> |
entries
Cached set of entries. |
protected float |
f
The acceptable load factor. |
protected int |
first
The index of the first entry in iteration order. |
protected K[] |
key
The array of keys. |
protected ObjectSortedSet<K> |
keys
Cached set of keys. |
protected int |
last
The index of the last entry in iteration order. |
protected long[] |
link
For each entry, the next and the previous entry in iteration order, stored as ((prev & 0xFFFFFFFFL) << 32) | (next & 0xFFFFFFFFL) . |
protected int |
mask
The mask for wrapping a position counter. |
protected int |
maxFill
Threshold after which we rehash. |
protected int |
n
The current table size. |
static long |
serialVersionUID
|
protected int |
size
Number of entries in the set. |
protected Hash.Strategy<K> |
strategy
The hash strategy of this custom map. |
protected boolean[] |
used
The array telling whether a position is used. |
protected float[] |
value
The array of values. |
protected FloatCollection |
values
Cached collection of values. |
Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2FloatFunction |
---|
defRetValue |
Fields inherited from interface it.unimi.dsi.fastutil.Hash |
---|
DEFAULT_GROWTH_FACTOR, DEFAULT_INITIAL_SIZE, DEFAULT_LOAD_FACTOR, FAST_LOAD_FACTOR, FREE, OCCUPIED, PRIMES, REMOVED, VERY_FAST_LOAD_FACTOR |
Constructor Summary | |
---|---|
Object2FloatLinkedOpenCustomHashMap(Hash.Strategy<K> strategy)
Creates a new hash map with initial expected Hash.DEFAULT_INITIAL_SIZE entries
and Hash.DEFAULT_LOAD_FACTOR as load factor. |
|
Object2FloatLinkedOpenCustomHashMap(int expected,
float f,
Hash.Strategy<K> strategy)
Creates a new hash map. |
|
Object2FloatLinkedOpenCustomHashMap(int expected,
Hash.Strategy<K> strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor. |
|
Object2FloatLinkedOpenCustomHashMap(K[] k,
float[] v,
float f,
Hash.Strategy<K> strategy)
Creates a new hash map using the elements of two parallel arrays. |
|
Object2FloatLinkedOpenCustomHashMap(K[] k,
float[] v,
Hash.Strategy<K> strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor using the elements of two parallel arrays. |
|
Object2FloatLinkedOpenCustomHashMap(Map<? extends K,? extends Float> m,
float f,
Hash.Strategy<K> strategy)
Creates a new hash map copying a given one. |
|
Object2FloatLinkedOpenCustomHashMap(Map<? extends K,? extends Float> m,
Hash.Strategy<K> strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given one. |
|
Object2FloatLinkedOpenCustomHashMap(Object2FloatMap<K> m,
float f,
Hash.Strategy<K> strategy)
Creates a new hash map copying a given type-specific one. |
|
Object2FloatLinkedOpenCustomHashMap(Object2FloatMap<K> m,
Hash.Strategy<K> strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific one. |
Method Summary | |
---|---|
float |
add(K k,
float incr)
Adds an increment to value currently associated with a key. |
void |
clear()
Removes all associations from this function (optional operation). |
Object2FloatLinkedOpenCustomHashMap<K> |
clone()
Returns a deep copy of this map. |
Comparator<? super K> |
comparator()
Returns the comparator associated with this sorted set, or null if it uses its keys' natural ordering. |
boolean |
containsKey(Object k)
Checks whether the given value is contained in AbstractObject2FloatMap.keySet() . |
boolean |
containsValue(float v)
Checks whether the given value is contained in AbstractObject2FloatMap.values() . |
K |
firstKey()
Returns the first key of this map in iteration order. |
protected void |
fixPointers(int i)
Modifies the link vector so that the given entry is removed. |
protected void |
fixPointers(int s,
int d)
Modifies the link vector for a shift from s to d. |
float |
getAndMoveToFirst(K k)
Returns the value to which the given key is mapped; if the key is present, it is moved to the first position of the iteration order. |
float |
getAndMoveToLast(K k)
Returns the value to which the given key is mapped; if the key is present, it is moved to the last position of the iteration order. |
float |
getFloat(Object k)
Returns the value to which the given key is mapped. |
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 map. |
Object2FloatSortedMap<K> |
headMap(K to)
Returns a view of the portion of this sorted map whose keys are strictly less than toKey . |
boolean |
isEmpty()
|
ObjectSortedSet<K> |
keySet()
Returns a type-specific-sorted-set view of the keys of this map. |
K |
lastKey()
Returns the last key of this map in iteration order. |
Object2FloatSortedMap.FastSortedEntrySet<K> |
object2FloatEntrySet()
Returns a type-specific sorted-set view of the mappings contained in this map. |
float |
put(K k,
float v)
Adds a pair to the map. |
Float |
put(K ok,
Float ov)
Delegates to the corresponding type-specific method, taking care of returning null on a missing key. |
float |
putAndMoveToFirst(K k,
float v)
Adds a pair to the map; if the key is already present, it is moved to the first position of the iteration order. |
float |
putAndMoveToLast(K k,
float v)
Adds a pair to the map; if the key is already present, it is moved to the last position of the iteration order. |
boolean |
rehash()
Deprecated. A no-op. |
protected void |
rehash(int newN)
Resizes the map. |
Float |
remove(Object ok)
Delegates to the corresponding type-specific method, taking care of returning null on a missing key. |
float |
removeFirstFloat()
Removes the mapping associated with the first key in iteration order. |
float |
removeFloat(Object k)
Removes the mapping with the given key. |
float |
removeLastFloat()
Removes the mapping associated with the last key in iteration order. |
protected int |
shiftKeys(int pos)
Shifts left entries with the specified hash code, starting at the specified position, and empties the resulting free entry. |
int |
size()
Returns the intended number of keys in this function, or -1 if no such number exists. |
Hash.Strategy<K> |
strategy()
Returns the hashing strategy. |
Object2FloatSortedMap<K> |
subMap(K from,
K to)
Returns a view of the portion of this sorted map whose keys range from fromKey , inclusive, to toKey , exclusive. |
Object2FloatSortedMap<K> |
tailMap(K from)
Returns a view of the portion of this sorted map whose keys are greater than or equal to fromKey . |
boolean |
trim()
Rehashes the map, making the table as small as possible. |
boolean |
trim(int n)
Rehashes this map if the table is too large. |
FloatCollection |
values()
Returns a type-specific collection view of the values contained in this map. |
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2FloatSortedMap |
---|
entrySet |
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2FloatMap |
---|
containsValue, equals, putAll, toString |
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2FloatFunction |
---|
defaultReturnValue, defaultReturnValue, get |
Methods inherited from class java.lang.Object |
---|
finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2FloatFunction |
---|
defaultReturnValue, defaultReturnValue |
Methods inherited from interface it.unimi.dsi.fastutil.Function |
---|
get |
Methods inherited from interface java.util.Map |
---|
containsValue, equals, get, putAll |
Field Detail |
---|
public static final long serialVersionUID
protected transient K[] key
protected transient float[] value
protected transient boolean[] used
protected final float f
protected transient int n
protected transient int maxFill
f
.
protected transient int mask
protected int size
protected transient volatile Object2FloatSortedMap.FastSortedEntrySet<K> entries
protected transient volatile ObjectSortedSet<K> keys
protected transient volatile FloatCollection values
protected transient int first
size
is nonzero; otherwise, it contains -1.
protected transient int last
size
is nonzero; otherwise, it contains -1.
protected transient long[] link
((prev & 0xFFFFFFFFL) << 32) | (next & 0xFFFFFFFFL)
.
The first entry contains predecessor -1, and the last entry
contains successor -1.
protected Hash.Strategy<K> strategy
Constructor Detail |
---|
public Object2FloatLinkedOpenCustomHashMap(int expected, float f, Hash.Strategy<K> 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 Object2FloatLinkedOpenCustomHashMap(int expected, Hash.Strategy<K> strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor.
expected
- the expected number of elements in the hash map.strategy
- the strategy.public Object2FloatLinkedOpenCustomHashMap(Hash.Strategy<K> strategy)
Hash.DEFAULT_INITIAL_SIZE
entries
and Hash.DEFAULT_LOAD_FACTOR
as load factor.
strategy
- the strategy.public Object2FloatLinkedOpenCustomHashMap(Map<? extends K,? extends Float> m, float f, Hash.Strategy<K> strategy)
m
- a Map
to be copied into the new hash map.f
- the load factor.strategy
- the strategy.public Object2FloatLinkedOpenCustomHashMap(Map<? extends K,? extends Float> m, Hash.Strategy<K> strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor copying a given one.
m
- a Map
to be copied into the new hash map.strategy
- the strategy.public Object2FloatLinkedOpenCustomHashMap(Object2FloatMap<K> m, float f, Hash.Strategy<K> strategy)
m
- a type-specific map to be copied into the new hash map.f
- the load factor.strategy
- the strategy.public Object2FloatLinkedOpenCustomHashMap(Object2FloatMap<K> m, Hash.Strategy<K> strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor copying a given type-specific one.
m
- a type-specific map to be copied into the new hash map.strategy
- the strategy.public Object2FloatLinkedOpenCustomHashMap(K[] k, float[] v, float f, Hash.Strategy<K> strategy)
k
- the array of keys of the new hash map.v
- the array of corresponding values in the new hash map.f
- the load factor.strategy
- the strategy.
IllegalArgumentException
- if k
and v
have different lengths.public Object2FloatLinkedOpenCustomHashMap(K[] k, float[] v, Hash.Strategy<K> strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor using the elements of two parallel arrays.
k
- the array of keys of the new hash map.v
- the array of corresponding values in the new hash map.strategy
- the strategy.
IllegalArgumentException
- if k
and v
have different lengths.Method Detail |
---|
public Hash.Strategy<K> strategy()
public float put(K k, float v)
Object2FloatFunction
put
in interface Object2FloatFunction<K>
put
in class AbstractObject2FloatFunction<K>
k
- the key.v
- the value.
Function.put(Object,Object)
public Float put(K ok, Float ov)
AbstractObject2FloatFunction
null
on a missing key.
This method must check whether the provided key is in the map using containsKey()
. Thus,
it probes the map twice. Implementors of subclasses should override it with a more efficient method.
put
in interface Function<K,Float>
put
in interface Map<K,Float>
put
in class AbstractObject2FloatFunction<K>
ok
- the key.ov
- the value.
null
if no value was present for the given key.Map.put(Object,Object)
public float add(K k, float incr)
Note that this method respects the default return value semantics: when called with a key that does not currently appears in the map, the key will be associated with the default return value plus the given increment.
k
- the key.incr
- the increment.
protected final int shiftKeys(int pos)
pos
- a starting position.
public float removeFloat(Object k)
Object2FloatFunction
removeFloat
in interface Object2FloatFunction<K>
removeFloat
in class AbstractObject2FloatFunction<K>
Function.remove(Object)
public Float remove(Object ok)
AbstractObject2FloatFunction
null
on a missing key.
This method must check whether the provided key is in the map using containsKey()
. Thus,
it probes the map twice. Implementors of subclasses should override it with a more efficient method.
remove
in interface Function<K,Float>
remove
in interface Map<K,Float>
remove
in class AbstractObject2FloatFunction<K>
null
if no value was present for the given key.Map.remove(Object)
public float removeFirstFloat()
NoSuchElementException
- is this map is empty.public float removeLastFloat()
NoSuchElementException
- is this map is empty.public float getAndMoveToFirst(K k)
k
- the key.
public float getAndMoveToLast(K k)
k
- the key.
public float putAndMoveToFirst(K k, float v)
k
- the key.v
- the value.
public float putAndMoveToLast(K k, float v)
k
- the key.v
- the value.
public float getFloat(Object k)
Object2FloatFunction
getFloat
in interface Object2FloatFunction<K>
k
- the key.
Function.get(Object)
public boolean containsKey(Object k)
AbstractObject2FloatMap
AbstractObject2FloatMap.keySet()
.
containsKey
in interface Function<K,Float>
containsKey
in interface Map<K,Float>
containsKey
in class AbstractObject2FloatMap<K>
k
- the key.
key
.Map.containsKey(Object)
public boolean containsValue(float v)
AbstractObject2FloatMap
AbstractObject2FloatMap.values()
.
containsValue
in interface Object2FloatMap<K>
containsValue
in class AbstractObject2FloatMap<K>
Map.containsValue(Object)
public void clear()
Function
clear
in interface Function<K,Float>
clear
in interface Map<K,Float>
clear
in class AbstractObject2FloatFunction<K>
Map.clear()
public int size()
Function
Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.
size
in interface Function<K,Float>
size
in interface Map<K,Float>
public boolean isEmpty()
isEmpty
in interface Map<K,Float>
isEmpty
in class AbstractObject2FloatMap<K>
@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)
protected void fixPointers(int i)
link
vector so that the given entry is removed.
If the given entry is the first or the last one, this method will complete in constant time; otherwise, it will have to search for the given entry.
i
- the index of an entry.protected void fixPointers(int s, int d)
link
vector for a shift from s to d.
If the given entry is the first or the last one, this method will complete in constant time; otherwise, it will have to search for the given entry.
s
- the source position.d
- the destination position.public K firstKey()
firstKey
in interface SortedMap<K,Float>
public K lastKey()
lastKey
in interface SortedMap<K,Float>
public Comparator<? super K> comparator()
Object2FloatSortedMap
Note that this specification strengthens the one given in SortedMap.comparator()
.
comparator
in interface Object2FloatSortedMap<K>
comparator
in interface SortedMap<K,Float>
SortedMap.comparator()
public Object2FloatSortedMap<K> tailMap(K from)
Object2FloatSortedMap
fromKey
.
Note that this specification strengthens the one given in SortedMap.tailMap(Object)
.
tailMap
in interface Object2FloatSortedMap<K>
tailMap
in interface SortedMap<K,Float>
SortedMap.tailMap(Object)
public Object2FloatSortedMap<K> headMap(K to)
Object2FloatSortedMap
toKey
.
Note that this specification strengthens the one given in SortedMap.headMap(Object)
.
headMap
in interface Object2FloatSortedMap<K>
headMap
in interface SortedMap<K,Float>
SortedMap.headMap(Object)
public Object2FloatSortedMap<K> subMap(K from, K to)
Object2FloatSortedMap
fromKey
, inclusive, to toKey
, exclusive.
Note that this specification strengthens the one given in SortedMap.subMap(Object,Object)
.
subMap
in interface Object2FloatSortedMap<K>
subMap
in interface SortedMap<K,Float>
SortedMap.subMap(Object,Object)
public Object2FloatSortedMap.FastSortedEntrySet<K> object2FloatEntrySet()
Object2FloatSortedMap
object2FloatEntrySet
in interface Object2FloatMap<K>
object2FloatEntrySet
in interface Object2FloatSortedMap<K>
Object2FloatSortedMap.entrySet()
public ObjectSortedSet<K> keySet()
AbstractObject2FloatSortedMap
The view is backed by the sorted set returned by AbstractObject2FloatSortedMap.entrySet()
. Note that
no attempt is made at caching the result of this method, as this would
require adding some attributes that lightweight implementations would
not need. Subclasses may easily override this policy by calling
this method and caching the result, but implementors are encouraged to
write more efficient ad-hoc implementations.
keySet
in interface Object2FloatMap<K>
keySet
in interface Object2FloatSortedMap<K>
keySet
in interface Map<K,Float>
keySet
in interface SortedMap<K,Float>
keySet
in class AbstractObject2FloatSortedMap<K>
Map.keySet()
public FloatCollection values()
AbstractObject2FloatSortedMap
The view is backed by the sorted set returned by AbstractObject2FloatSortedMap.entrySet()
. Note that
no attempt is made at caching the result of this method, as this would
require adding some attributes that lightweight implementations would
not need. Subclasses may easily override this policy by calling
this method and caching the result, but implementors are encouraged to
write more efficient ad-hoc implementations.
values
in interface Object2FloatMap<K>
values
in interface Object2FloatSortedMap<K>
values
in interface Map<K,Float>
values
in interface SortedMap<K,Float>
values
in class AbstractObject2FloatSortedMap<K>
Map.values()
@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 map in a table of size
N.
size()
)
This method is useful when reusing maps. Clearing a map leaves the table size untouched. If you are reusing a map 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 maps.
n
- the threshold for the trimming.
trim()
protected void rehash(int newN)
This method implements the basic rehashing strategy, and may be overriden by subclasses implementing different rehashing strategies (e.g., disk-based rehashing). However, you should not override this method unless you understand the internal workings of this class.
newN
- the new sizepublic Object2FloatLinkedOpenCustomHashMap<K> clone()
This method performs a deep copy of this hash map; the data stored in the map, however, is not cloned. Note that this makes a difference only for object keys.
clone
in class Object
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 Map<K,Float>
hashCode
in class AbstractObject2FloatMap<K>
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