Char2ObjectOpenHashMap (fastutil 7.0.2)

java.lang.Object
- it.unimi.dsi.fastutil.chars.AbstractChar2ObjectFunction<V>
- - it.unimi.dsi.fastutil.chars.AbstractChar2ObjectMap<V>
  - - it.unimi.dsi.fastutil.chars.Char2ObjectOpenHashMap<V>

All Implemented Interfaces:

Char2ObjectFunction<V>, Char2ObjectMap<V>, Function<Character,V>, Hash, Serializable, Cloneable, Map<Character,V>
```
public class Char2ObjectOpenHashMap<V>
extends AbstractChar2ObjectMap<V>
implements Serializable, Cloneable, Hash
```
A type-specific hash map with a fast, small-footprint implementation.
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.

See Also:

Hash, HashCommon, Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.chars.AbstractChar2ObjectMap
  AbstractChar2ObjectMap.BasicEntry<V>
- Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.Hash
  Hash.Strategy<K>
- Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.chars.Char2ObjectMap
  Char2ObjectMap.Entry<V>, Char2ObjectMap.FastEntrySet<V>

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

Constructors
Constructor and Description
`Char2ObjectOpenHashMap()` Creates a new hash map with initial expected `Hash.DEFAULT_INITIAL_SIZE` entries and `Hash.DEFAULT_LOAD_FACTOR` as load factor.
`Char2ObjectOpenHashMap(char[] k, V[] v)` Creates a new hash map with `Hash.DEFAULT_LOAD_FACTOR` as load factor using the elements of two parallel arrays.
`Char2ObjectOpenHashMap(char[] k, V[] v, float f)` Creates a new hash map using the elements of two parallel arrays.
`Char2ObjectOpenHashMap(Char2ObjectMap<V> m)` Creates a new hash map with `Hash.DEFAULT_LOAD_FACTOR` as load factor copying a given type-specific one.
`Char2ObjectOpenHashMap(Char2ObjectMap<V> m, float f)` Creates a new hash map copying a given type-specific one.
`Char2ObjectOpenHashMap(int expected)` Creates a new hash map with `Hash.DEFAULT_LOAD_FACTOR` as load factor.
`Char2ObjectOpenHashMap(int expected, float f)` Creates a new hash map.
`Char2ObjectOpenHashMap(Map<? extends Character,? extends V> m)` Creates a new hash map with `Hash.DEFAULT_LOAD_FACTOR` as load factor copying a given one.
`Char2ObjectOpenHashMap(Map<? extends Character,? extends V> m, float f)` Creates a new hash map copying a given one.

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`Char2ObjectMap.FastEntrySet<V>`	`char2ObjectEntrySet()` Returns a type-specific set view of the mappings contained in this map.
`void`	`clear()` Removes all associations from this function (optional operation).
`Char2ObjectOpenHashMap<V>`	`clone()` Returns a deep copy of this map.
`boolean`	`containsKey(char k)` Checks whether the given value is contained in `AbstractChar2ObjectMap.keySet()`.
`boolean`	`containsValue(Object v)` Checks whether the given value is contained in `AbstractChar2ObjectMap.values()`.
`V`	`get(char k)` Returns the value to which the given key is mapped.
`V`	`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.
`V`	`put(Character ok, V ov)` Delegates to the corresponding type-specific method, taking care of returning `null` on a missing key.
`V`	`put(char k, V v)` Adds a pair to the map.
`void`	`putAll(Map<? extends Character,? extends V> m)` Puts all pairs in the given map.
`boolean`	`rehash()` Deprecated. A no-op.
`V`	`remove(char k)` Removes the mapping with the given key.
`V`	`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.
`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.
`ObjectCollection<V>`	`values()` Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.chars.AbstractChar2ObjectMap
entrySet, equals, toString

Methods inherited from class it.unimi.dsi.fastutil.chars.AbstractChar2ObjectFunction
containsKey, defaultReturnValue, defaultReturnValue, get

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.chars.Char2ObjectFunction
defaultReturnValue, defaultReturnValue

Methods inherited from interface it.unimi.dsi.fastutil.Function
containsKey, get

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, containsKey, forEach, get, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

- Constructor Detail
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(int expected,
                              float f)
```
    Creates a new hash map.
    The actual table size will be the least power of two greater than expected/f.
    
    Parameters:
    
    expected - the expected number of elements in the hash set.
    
    f - the load factor.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(int expected)
```
    Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor.
    
    Parameters:
    
    expected - the expected number of elements in the hash map.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap()
```
    Creates a new hash map with initial expected Hash.DEFAULT_INITIAL_SIZE entries and Hash.DEFAULT_LOAD_FACTOR as load factor.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(Map<? extends Character,? extends V> m,
                              float f)
```
    Creates a new hash map copying a given one.
    
    Parameters:
    
    m - a Map to be copied into the new hash map.
    
    f - the load factor.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(Map<? extends Character,? extends V> m)
```
    Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given one.
    
    Parameters:
    
    m - a Map to be copied into the new hash map.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(Char2ObjectMap<V> m,
                              float f)
```
    Creates a new hash map copying a given type-specific one.
    
    Parameters:
    
    m - a type-specific map to be copied into the new hash map.
    
    f - the load factor.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(Char2ObjectMap<V> m)
```
    Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific one.
    
    Parameters:
    
    m - a type-specific map to be copied into the new hash map.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(char[] k,
                              V[] v,
                              float f)
```
    Creates a new hash map using the elements of two parallel arrays.
    
    Parameters:
    
    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.
    
    Throws:
    
    IllegalArgumentException - if k and v have different lengths.
  - Char2ObjectOpenHashMap
```
public Char2ObjectOpenHashMap(char[] k,
                              V[] v)
```
    Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor using the elements of two parallel arrays.
    
    Parameters:
    
    k - the array of keys of the new hash map.
    
    v - the array of corresponding values in the new hash map.
    
    Throws:
    
    IllegalArgumentException - if k and v have different lengths.
- Method Detail
  - putAll
```
public void putAll(Map<? extends Character,? extends V> m)
```
    Puts all pairs in the given map. If the map implements the interface of this map, it uses the faster iterators.
    
    Specified by:
    
    putAll in interface Map<Character,V>
    
    Overrides:
    
    putAll in class AbstractChar2ObjectMap<V>
    
    Parameters:
    
    m - a map.
  - put
```
public V put(char k,
             V v)
```
    Description copied from interface: Char2ObjectFunction
    
    Adds a pair to the map.
    
    Specified by:
    
    put in interface Char2ObjectFunction<V>
    
    Overrides:
    
    put in class AbstractChar2ObjectFunction<V>
    
    Parameters:
    
    k - the key.
    
    v - the value.
    
    Returns:
    
    the old value, or the default return value if no value was present for the given key.
    
    See Also:
    
    Function.put(Object,Object)
  - put
```
public V put(Character ok,
             V ov)
```
    Description copied from class: AbstractChar2ObjectFunction
    
    Delegates to the corresponding type-specific method, taking care of returning 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.
    
    Specified by:
    
    put in interface Function<Character,V>
    
    Specified by:
    
    put in interface Map<Character,V>
    
    Overrides:
    
    put in class AbstractChar2ObjectFunction<V>
    
    Parameters:
    
    ok - the key.
    
    ov - the value.
    
    Returns:
    
    the old value, or null if no value was present for the given key.
    
    See Also:
    
    Map.put(Object,Object)
  - remove
```
public V remove(char k)
```
    Description copied from interface: Char2ObjectFunction
    
    Removes the mapping with the given key.
    
    Specified by:
    
    remove in interface Char2ObjectFunction<V>
    
    Overrides:
    
    remove in class AbstractChar2ObjectFunction<V>
    
    Parameters:
    
    k - the key.
    
    Returns:
    
    the old value, or the default return value if no value was present for the given key.
    
    See Also:
    
    Function.remove(Object)
  - remove
```
public V remove(Object ok)
```
    Description copied from class: AbstractChar2ObjectFunction
    
    Delegates to the corresponding type-specific method, taking care of returning 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.
    
    Specified by:
    
    remove in interface Function<Character,V>
    
    Specified by:
    
    remove in interface Map<Character,V>
    
    Overrides:
    
    remove in class AbstractChar2ObjectFunction<V>
    
    Parameters:
    
    ok - the key.
    
    Returns:
    
    the old value, or null if no value was present for the given key.
    
    See Also:
    
    Map.remove(Object)
  - get
```
public V get(Character ok)
```
  - get
```
public V get(char k)
```
    Description copied from interface: Char2ObjectFunction
    
    Returns the value to which the given key is mapped.
    
    Specified by:
    
    get in interface Char2ObjectFunction<V>
    
    Parameters:
    
    k - the key.
    
    Returns:
    
    the corresponding value, or the default return value if no value was present for the given key.
    
    See Also:
    
    Function.get(Object)
  - containsKey
```
public boolean containsKey(char k)
```
    Description copied from class: AbstractChar2ObjectMap
    
    Checks whether the given value is contained in AbstractChar2ObjectMap.keySet().
    
    Specified by:
    
    containsKey in interface Char2ObjectFunction<V>
    
    Overrides:
    
    containsKey in class AbstractChar2ObjectMap<V>
    
    See Also:
    
    Function.containsKey(Object)
  - containsValue
```
public boolean containsValue(Object v)
```
    Description copied from class: AbstractChar2ObjectMap
    
    Checks whether the given value is contained in AbstractChar2ObjectMap.values().
    
    Specified by:
    
    containsValue in interface Map<Character,V>
    
    Overrides:
    
    containsValue in class AbstractChar2ObjectMap<V>
  - clear
```
public void clear()
```
    Description copied from interface: Function
    
    Removes all associations from this function (optional operation).
    
    Specified by:
    
    clear in interface Function<Character,V>
    
    Specified by:
    
    clear in interface Map<Character,V>
    
    Overrides:
    
    clear in class AbstractChar2ObjectFunction<V>
    
    See Also:
    
    Map.clear()
  - size
```
public int size()
```
    Description copied from interface: Function
    
    Returns the intended number of keys in this function, or -1 if no such number exists.
    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.
    
    Specified by:
    
    size in interface Function<Character,V>
    
    Specified by:
    
    size in interface Map<Character,V>
    
    Returns:
    
    the intended number of keys in this function, or -1 if that number is not available.
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Map<Character,V>
    
    Overrides:
    
    isEmpty in class AbstractChar2ObjectMap<V>
  - growthFactor
```
@Deprecated
public void growthFactor(int growthFactor)
```
    Deprecated. Since fastutil 6.1.0, hash tables are doubled when they are too full.
    
    A no-op for backward compatibility.
    
    Parameters:
    
    growthFactor - unused.
  - growthFactor
```
@Deprecated
public int growthFactor()
```
    Deprecated. Since fastutil 6.1.0, hash tables are doubled when they are too full.
    
    Gets the growth factor (2).
    
    Returns:
    
    the growth factor of this set, which is fixed (2).
    
    See Also:
    
    growthFactor(int)
  - char2ObjectEntrySet
```
public Char2ObjectMap.FastEntrySet<V> char2ObjectEntrySet()
```
    Description copied from interface: Char2ObjectMap
    
    Returns a type-specific set view of the mappings contained in this map.
    This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Char2ObjectMap.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).
    
    Specified by:
    
    char2ObjectEntrySet in interface Char2ObjectMap<V>
    
    Returns:
    
    a type-specific set view of the mappings contained in this map.
    
    See Also:
    
    Char2ObjectMap.entrySet()
  - keySet
```
public CharSet keySet()
```
    Description copied from class: AbstractChar2ObjectMap
    
    Returns a type-specific-set view of the keys of this map.
    The view is backed by the set returned by AbstractChar2ObjectMap.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.
    
    Specified by:
    
    keySet in interface Char2ObjectMap<V>
    
    Specified by:
    
    keySet in interface Map<Character,V>
    
    Overrides:
    
    keySet in class AbstractChar2ObjectMap<V>
    
    Returns:
    
    a set view of the keys of this map; it may be safely cast to a type-specific interface.
    
    See Also:
    
    Map.keySet()
  - values
```
public ObjectCollection<V> values()
```
    Description copied from class: AbstractChar2ObjectMap
    
    Returns a type-specific-set view of the values of this map.
    The view is backed by the set returned by AbstractChar2ObjectMap.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.
    
    Specified by:
    
    values in interface Char2ObjectMap<V>
    
    Specified by:
    
    values in interface Map<Character,V>
    
    Overrides:
    
    values in class AbstractChar2ObjectMap<V>
    
    Returns:
    
    a set view of the values of this map; it may be safely cast to a type-specific interface.
    
    See Also:
    
    Map.values()
  - rehash
```
@Deprecated
public boolean rehash()
```
    Deprecated. A no-op.
    
    A no-op for backward compatibility. The kind of tables implemented by this class never need rehashing.
    If you need to reduce the table size to fit exactly this set, use trim().
    
    Returns:
    
    true.
    
    See Also:
    
    trim()
  - trim
```
public boolean trim()
```
    Rehashes the map, making the table as small as possible.
    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.
    
    Returns:
    
    true if there was enough memory to trim the map.
    
    See Also:
    
    trim(int)
  - trim
```
public boolean trim(int n)
```
    Rehashes this map if the table is too large.
    Let N be the smallest table size that can hold max(n,size()) 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.
    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.
    
    Parameters:
    
    n - the threshold for the trimming.
    
    Returns:
    
    true if there was enough memory to trim the map.
    
    See Also:
    
    trim()
  - clone
```
public Char2ObjectOpenHashMap<V> clone()
```
    Returns a deep copy of this map.
    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.
    
    Overrides:
    
    clone in class Object
    
    Returns:
    
    a deep copy of this map.
  - hashCode
```
public int hashCode()
```
    Returns a hash code for this map. This method overrides the generic method provided by the superclass. Since 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.
    
    Specified by:
    
    hashCode in interface Map<Character,V>
    
    Overrides:
    
    hashCode in class AbstractChar2ObjectMap<V>
    
    Returns:
    
    a hash code for this map.

Class Char2ObjectOpenHashMap<V>

Nested Class Summary

Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.chars.AbstractChar2ObjectMap

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.Hash

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.chars.Char2ObjectMap

Field Summary

Fields inherited from interface it.unimi.dsi.fastutil.Hash

Constructor Summary

Method Summary

Methods inherited from class it.unimi.dsi.fastutil.chars.AbstractChar2ObjectMap

Methods inherited from class it.unimi.dsi.fastutil.chars.AbstractChar2ObjectFunction

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.chars.Char2ObjectFunction

Methods inherited from interface it.unimi.dsi.fastutil.Function

Methods inherited from interface java.util.Map

Constructor Detail

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Char2ObjectOpenHashMap

Method Detail

putAll

put

put

remove

remove

get

get

containsKey

containsValue

clear

size

isEmpty

growthFactor

growthFactor

char2ObjectEntrySet

keySet

values

rehash

trim

trim

clone

hashCode