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java.lang.Objectit.unimi.dsi.fastutil.bytes.AbstractByte2ShortFunction
it.unimi.dsi.fastutil.bytes.AbstractByte2ShortMap
it.unimi.dsi.fastutil.bytes.Byte2ShortOpenCustomHashMap
public class Byte2ShortOpenCustomHashMap
A type-specific hash map with a fast, small-footprint implementation whose hashing strategy is specified at creation time.
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.
Warning: The implementation of this class has significantly
changed in fastutil
6.1.0. Please read the
comments about this issue in the section “Faster Hash Tables” of the overview.
Hash
,
HashCommon
,
Serialized FormNested Class Summary |
---|
Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ShortMap |
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AbstractByte2ShortMap.BasicEntry |
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.Hash |
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Hash.Strategy<K> |
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ShortMap |
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Byte2ShortMap.Entry, Byte2ShortMap.FastEntrySet |
Field Summary |
---|
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 | |
---|---|
Byte2ShortOpenCustomHashMap(byte[] k,
short[] v,
ByteHash.Strategy strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor using the elements of two parallel arrays. |
|
Byte2ShortOpenCustomHashMap(byte[] k,
short[] v,
float f,
ByteHash.Strategy strategy)
Creates a new hash map using the elements of two parallel arrays. |
|
Byte2ShortOpenCustomHashMap(Byte2ShortMap m,
ByteHash.Strategy strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific one. |
|
Byte2ShortOpenCustomHashMap(Byte2ShortMap m,
float f,
ByteHash.Strategy strategy)
Creates a new hash map copying a given type-specific one. |
|
Byte2ShortOpenCustomHashMap(ByteHash.Strategy strategy)
Creates a new hash map with initial expected Hash.DEFAULT_INITIAL_SIZE entries
and Hash.DEFAULT_LOAD_FACTOR as load factor. |
|
Byte2ShortOpenCustomHashMap(int expected,
ByteHash.Strategy strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor. |
|
Byte2ShortOpenCustomHashMap(int expected,
float f,
ByteHash.Strategy strategy)
Creates a new hash map. |
|
Byte2ShortOpenCustomHashMap(java.util.Map<? extends java.lang.Byte,? extends java.lang.Short> m,
ByteHash.Strategy strategy)
Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given one. |
|
Byte2ShortOpenCustomHashMap(java.util.Map<? extends java.lang.Byte,? extends java.lang.Short> m,
float f,
ByteHash.Strategy strategy)
Creates a new hash map copying a given one. |
Method Summary | |
---|---|
short |
add(byte k,
short incr)
Deprecated. use addTo() instead; having the same name of a Set method turned out to be a recipe for disaster. |
short |
addTo(byte k,
short incr)
Adds an increment to value currently associated with a key. |
Byte2ShortMap.FastEntrySet |
byte2ShortEntrySet()
Returns a type-specific set view of the mappings contained in this map. |
void |
clear()
Removes all associations from this function (optional operation). |
Byte2ShortOpenCustomHashMap |
clone()
Returns a deep copy of this map. |
boolean |
containsKey(byte k)
Checks whether the given value is contained in AbstractByte2ShortMap.keySet() . |
boolean |
containsValue(short v)
Checks whether the given value is contained in AbstractByte2ShortMap.values() . |
short |
get(byte k)
Returns the value to which the given key is mapped. |
java.lang.Short |
get(java.lang.Byte 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()
|
ByteSet |
keySet()
Returns a type-specific-set view of the keys of this map. |
short |
put(byte k,
short v)
Adds a pair to the map. |
java.lang.Short |
put(java.lang.Byte ok,
java.lang.Short ov)
Delegates to the corresponding type-specific method, taking care of returning null on a missing key. |
boolean |
rehash()
Deprecated. A no-op. |
short |
remove(byte k)
Removes the mapping with the given key. |
java.lang.Short |
remove(java.lang.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. |
ByteHash.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. |
Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ShortMap |
---|
containsValue, entrySet, equals, putAll, toString |
Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ShortFunction |
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containsKey, defaultReturnValue, defaultReturnValue, get |
Methods inherited from class java.lang.Object |
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getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ShortFunction |
---|
defaultReturnValue, defaultReturnValue |
Methods inherited from interface it.unimi.dsi.fastutil.Function |
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containsKey, get |
Methods inherited from interface java.util.Map |
---|
containsKey, get |
Constructor Detail |
---|
public Byte2ShortOpenCustomHashMap(int expected, float f, ByteHash.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 Byte2ShortOpenCustomHashMap(int expected, ByteHash.Strategy strategy)
Hash.DEFAULT_LOAD_FACTOR
as load factor.
expected
- the expected number of elements in the hash map.strategy
- the strategy.public Byte2ShortOpenCustomHashMap(ByteHash.Strategy strategy)
Hash.DEFAULT_INITIAL_SIZE
entries
and Hash.DEFAULT_LOAD_FACTOR
as load factor.
strategy
- the strategy.public Byte2ShortOpenCustomHashMap(java.util.Map<? extends java.lang.Byte,? extends java.lang.Short> m, float f, ByteHash.Strategy strategy)
m
- a Map
to be copied into the new hash map.f
- the load factor.strategy
- the strategy.public Byte2ShortOpenCustomHashMap(java.util.Map<? extends java.lang.Byte,? extends java.lang.Short> m, ByteHash.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 Byte2ShortOpenCustomHashMap(Byte2ShortMap m, float f, ByteHash.Strategy strategy)
m
- a type-specific map to be copied into the new hash map.f
- the load factor.strategy
- the strategy.public Byte2ShortOpenCustomHashMap(Byte2ShortMap m, ByteHash.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 Byte2ShortOpenCustomHashMap(byte[] k, short[] v, float f, ByteHash.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.
java.lang.IllegalArgumentException
- if k
and v
have different lengths.public Byte2ShortOpenCustomHashMap(byte[] k, short[] v, ByteHash.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.
java.lang.IllegalArgumentException
- if k
and v
have different lengths.Method Detail |
---|
public ByteHash.Strategy strategy()
public short put(byte k, short v)
Byte2ShortFunction
put
in interface Byte2ShortFunction
put
in class AbstractByte2ShortFunction
k
- the key.v
- the value.
Function.put(Object,Object)
public java.lang.Short put(java.lang.Byte ok, java.lang.Short ov)
AbstractByte2ShortFunction
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<java.lang.Byte,java.lang.Short>
put
in interface java.util.Map<java.lang.Byte,java.lang.Short>
put
in class AbstractByte2ShortFunction
ok
- the key.ov
- the value.
null
if no value was present for the given key.Map.put(Object,Object)
@Deprecated public short add(byte k, short incr)
addTo()
instead; having the same name of a Set
method turned out to be a recipe for disaster.
k
- the key.incr
- the increment.
public short addTo(byte 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(byte k)
Byte2ShortFunction
remove
in interface Byte2ShortFunction
remove
in class AbstractByte2ShortFunction
Function.remove(Object)
public java.lang.Short remove(java.lang.Object ok)
AbstractByte2ShortFunction
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<java.lang.Byte,java.lang.Short>
remove
in interface java.util.Map<java.lang.Byte,java.lang.Short>
remove
in class AbstractByte2ShortFunction
null
if no value was present for the given key.Map.remove(Object)
public java.lang.Short get(java.lang.Byte ok)
public short get(byte k)
Byte2ShortFunction
get
in interface Byte2ShortFunction
k
- the key.
Function.get(Object)
public boolean containsKey(byte k)
AbstractByte2ShortMap
AbstractByte2ShortMap.keySet()
.
containsKey
in interface Byte2ShortFunction
containsKey
in class AbstractByte2ShortMap
Function.containsKey(Object)
public boolean containsValue(short v)
AbstractByte2ShortMap
AbstractByte2ShortMap.values()
.
containsValue
in interface Byte2ShortMap
containsValue
in class AbstractByte2ShortMap
Map.containsValue(Object)
public void clear()
Function
clear
in interface Function<java.lang.Byte,java.lang.Short>
clear
in interface java.util.Map<java.lang.Byte,java.lang.Short>
clear
in class AbstractByte2ShortFunction
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<java.lang.Byte,java.lang.Short>
size
in interface java.util.Map<java.lang.Byte,java.lang.Short>
public boolean isEmpty()
isEmpty
in interface java.util.Map<java.lang.Byte,java.lang.Short>
isEmpty
in class AbstractByte2ShortMap
@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 Byte2ShortMap.FastEntrySet byte2ShortEntrySet()
Byte2ShortMap
This method is necessary because there is no inheritance along
type parameters: it is thus impossible to strengthen Byte2ShortMap.entrySet()
so that it returns an ObjectSet
of objects of type Map.Entry
(the latter makes it possible to
access keys and values with type-specific methods).
byte2ShortEntrySet
in interface Byte2ShortMap
Byte2ShortMap.entrySet()
public ByteSet keySet()
AbstractByte2ShortMap
The view is backed by the set returned by AbstractByte2ShortMap.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 Byte2ShortMap
keySet
in interface java.util.Map<java.lang.Byte,java.lang.Short>
keySet
in class AbstractByte2ShortMap
Map.keySet()
public ShortCollection values()
AbstractByte2ShortMap
The view is backed by the set returned by AbstractByte2ShortMap.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 Byte2ShortMap
values
in interface java.util.Map<java.lang.Byte,java.lang.Short>
values
in class AbstractByte2ShortMap
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()
public Byte2ShortOpenCustomHashMap 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 java.lang.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 java.util.Map<java.lang.Byte,java.lang.Short>
hashCode
in class AbstractByte2ShortMap
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