public class Char2ShortOpenCustomHashMap extends AbstractChar2ShortMap implements Serializable, Cloneable, Hash
Instances of this class use a hash table to represent a map. 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 FormAbstractChar2ShortMap.BasicEntryHash.Strategy<K>Char2ShortMap.Entry, Char2ShortMap.FastEntrySetDEFAULT_GROWTH_FACTOR, DEFAULT_INITIAL_SIZE, DEFAULT_LOAD_FACTOR, FAST_LOAD_FACTOR, FREE, OCCUPIED, PRIMES, REMOVED, VERY_FAST_LOAD_FACTOR| Constructor and Description |
|---|
Char2ShortOpenCustomHashMap(char[] k,
short[] v,
CharHash.Strategy strategy)
Creates a new hash map with
Hash.DEFAULT_LOAD_FACTOR as load factor using the elements of two parallel arrays. |
Char2ShortOpenCustomHashMap(char[] k,
short[] v,
float f,
CharHash.Strategy strategy)
Creates a new hash map using the elements of two parallel arrays.
|
Char2ShortOpenCustomHashMap(Char2ShortMap m,
CharHash.Strategy strategy)
Creates a new hash map with
Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific one. |
Char2ShortOpenCustomHashMap(Char2ShortMap m,
float f,
CharHash.Strategy strategy)
Creates a new hash map copying a given type-specific one.
|
Char2ShortOpenCustomHashMap(CharHash.Strategy strategy)
Creates a new hash map with initial expected
Hash.DEFAULT_INITIAL_SIZE entries and Hash.DEFAULT_LOAD_FACTOR as load factor. |
Char2ShortOpenCustomHashMap(int expected,
CharHash.Strategy strategy)
Creates a new hash map with
Hash.DEFAULT_LOAD_FACTOR as load factor. |
Char2ShortOpenCustomHashMap(int expected,
float f,
CharHash.Strategy strategy)
Creates a new hash map.
|
Char2ShortOpenCustomHashMap(Map<? extends Character,? extends Short> m,
CharHash.Strategy strategy)
Creates a new hash map with
Hash.DEFAULT_LOAD_FACTOR as load factor copying a given one. |
Char2ShortOpenCustomHashMap(Map<? extends Character,? extends Short> m,
float f,
CharHash.Strategy strategy)
Creates a new hash map copying a given one.
|
| Modifier and Type | Method and Description |
|---|---|
short |
addTo(char k,
short incr)
Adds an increment to value currently associated with a key.
|
Char2ShortMap.FastEntrySet |
char2ShortEntrySet()
Returns a type-specific set view of the mappings contained in this map.
|
void |
clear()
Removes all associations from this function (optional operation).
|
Char2ShortOpenCustomHashMap |
clone()
Returns a deep copy of this map.
|
boolean |
containsKey(char k)
Checks whether the given value is contained in
AbstractChar2ShortMap.keySet(). |
boolean |
containsValue(short v)
Checks whether the given value is contained in
AbstractChar2ShortMap.values(). |
short |
get(char k)
Returns the value to which the given key is mapped.
|
Short |
get(Character ok) |
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.
|
boolean |
isEmpty() |
CharSet |
keySet()
Returns a type-specific-set view of the keys of this map.
|
Short |
put(Character ok,
Short ov)
Delegates to the corresponding type-specific method, taking care of returning
null on a missing key. |
short |
put(char k,
short v)
Adds a pair to the map.
|
void |
putAll(Map<? extends Character,? extends Short> m)
Puts all pairs in the given map.
|
boolean |
rehash()
Deprecated.
A no-op.
|
short |
remove(char k)
Removes the mapping with the given key.
|
Short |
remove(Object ok)
Delegates to the corresponding type-specific method, taking care of returning
null on a missing key. |
int |
size()
Returns the intended number of keys in this function, or -1 if no such number exists.
|
CharHash.Strategy |
strategy()
Returns the hashing strategy.
|
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.
|
ShortCollection |
values()
Returns a type-specific-set view of the values of this map.
|
containsValue, entrySet, equals, toStringcontainsKey, defaultReturnValue, defaultReturnValue, getdefaultReturnValue, defaultReturnValuecontainsKey, getcompute, computeIfAbsent, computeIfPresent, containsKey, forEach, get, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAllpublic Char2ShortOpenCustomHashMap(int expected,
float f,
CharHash.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 Char2ShortOpenCustomHashMap(int expected,
CharHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR as load factor.expected - the expected number of elements in the hash map.strategy - the strategy.public Char2ShortOpenCustomHashMap(CharHash.Strategy strategy)
Hash.DEFAULT_INITIAL_SIZE entries and Hash.DEFAULT_LOAD_FACTOR as load factor.strategy - the strategy.public Char2ShortOpenCustomHashMap(Map<? extends Character,? extends Short> m, float f, CharHash.Strategy strategy)
m - a Map to be copied into the new hash map.f - the load factor.strategy - the strategy.public Char2ShortOpenCustomHashMap(Map<? extends Character,? extends Short> m, CharHash.Strategy 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 Char2ShortOpenCustomHashMap(Char2ShortMap m, float f, CharHash.Strategy strategy)
m - a type-specific map to be copied into the new hash map.f - the load factor.strategy - the strategy.public Char2ShortOpenCustomHashMap(Char2ShortMap m, CharHash.Strategy 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 Char2ShortOpenCustomHashMap(char[] k,
short[] v,
float f,
CharHash.Strategy 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 Char2ShortOpenCustomHashMap(char[] k,
short[] v,
CharHash.Strategy 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.public CharHash.Strategy strategy()
public void putAll(Map<? extends Character,? extends Short> m)
public short put(char k,
short v)
Char2ShortFunctionput in interface Char2ShortFunctionput in class AbstractChar2ShortFunctionk - the key.v - the value.Function.put(Object,Object)public Short put(Character ok, Short ov)
AbstractChar2ShortFunctionnull 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<Character,Short>put in interface Map<Character,Short>put in class AbstractChar2ShortFunctionok - the key.ov - the value.null if no value was present for the given key.Map.put(Object,Object)public short addTo(char k,
short 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.public short remove(char k)
Char2ShortFunctionremove in interface Char2ShortFunctionremove in class AbstractChar2ShortFunctionk - the key.Function.remove(Object)public Short remove(Object ok)
AbstractChar2ShortFunctionnull 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.
public short get(char k)
Char2ShortFunctionget in interface Char2ShortFunctionk - the key.Function.get(Object)public boolean containsKey(char k)
AbstractChar2ShortMapAbstractChar2ShortMap.keySet().containsKey in interface Char2ShortFunctioncontainsKey in class AbstractChar2ShortMapFunction.containsKey(Object)public boolean containsValue(short v)
AbstractChar2ShortMapAbstractChar2ShortMap.values().containsValue in interface Char2ShortMapcontainsValue in class AbstractChar2ShortMapMap.containsValue(Object)public void clear()
Functionpublic int size()
FunctionMost function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.
public boolean isEmpty()
@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 Char2ShortMap.FastEntrySet char2ShortEntrySet()
Char2ShortMapThis method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Char2ShortMap.entrySet() so that it returns an
ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).
char2ShortEntrySet in interface Char2ShortMapChar2ShortMap.entrySet()public CharSet keySet()
AbstractChar2ShortMapThe view is backed by the set returned by AbstractChar2ShortMap.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 Char2ShortMapkeySet in interface Map<Character,Short>keySet in class AbstractChar2ShortMapMap.keySet()public ShortCollection values()
AbstractChar2ShortMapThe view is backed by the set returned by AbstractChar2ShortMap.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 Char2ShortMapvalues in interface Map<Character,Short>values in class AbstractChar2ShortMapMap.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()public Char2ShortOpenCustomHashMap 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.
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.