Class Reference2ReferenceArrayMap<K,V>
- java.lang.Object
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- it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,V>
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- it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceMap<K,V>
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- it.unimi.dsi.fastutil.objects.Reference2ReferenceArrayMap<K,V>
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- All Implemented Interfaces:
Function<K,V>
,Reference2ReferenceFunction<K,V>
,Reference2ReferenceMap<K,V>
,java.io.Serializable
,java.lang.Cloneable
,java.util.function.Function<K,V>
,java.util.Map<K,V>
public class Reference2ReferenceArrayMap<K,V> extends AbstractReference2ReferenceMap<K,V> implements java.io.Serializable, java.lang.Cloneable
A simple, brute-force implementation of a map based on two parallel backing arrays.The main purpose of this implementation is that of wrapping cleanly the brute-force approach to the storage of a very small number of pairs: just put them into two parallel arrays and scan linearly to find an item.
- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceMap
AbstractReference2ReferenceMap.BasicEntry<K,V>, AbstractReference2ReferenceMap.BasicEntrySet<K,V>
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Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceMap
Reference2ReferenceMap.Entry<K,V>, Reference2ReferenceMap.FastEntrySet<K,V>
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Constructor Summary
Constructors Constructor Description Reference2ReferenceArrayMap()
Creates a new empty array map.Reference2ReferenceArrayMap(int capacity)
Creates a new empty array map of given capacity.Reference2ReferenceArrayMap(Reference2ReferenceMap<K,V> m)
Creates a new empty array map copying the entries of a given map.Reference2ReferenceArrayMap(java.lang.Object[] key, java.lang.Object[] value)
Creates a new empty array map with given key and value backing arrays.Reference2ReferenceArrayMap(java.lang.Object[] key, java.lang.Object[] value, int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.Reference2ReferenceArrayMap(java.util.Map<? extends K,? extends V> m)
Creates a new empty array map copying the entries of a given map.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
clear()
Removes all of the mappings from this map (optional operation).Reference2ReferenceArrayMap<K,V>
clone()
Returns a deep copy of this map.boolean
containsKey(java.lang.Object k)
Returns true if this function contains a mapping for the specified key.boolean
containsValue(java.lang.Object v)
V
get(java.lang.Object k)
Returns the value to which the given key is mapped.boolean
isEmpty()
ReferenceSet<K>
keySet()
Returns a type-specific-set view of the keys of this map.V
put(K k, V v)
Adds a pair to the map (optional operation).Reference2ReferenceMap.FastEntrySet<K,V>
reference2ReferenceEntrySet()
Returns a type-specific set view of the mappings contained in this map.V
remove(java.lang.Object k)
Removes the mapping with the given key (optional operation).int
size()
Returns the number of key/value mappings in this map.ReferenceCollection<V>
values()
Returns a type-specific-set view of the values of this map.-
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceMap
equals, hashCode, putAll, toString
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Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction
defaultReturnValue, defaultReturnValue
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Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceFunction
andThen, andThen, andThen, andThen, andThen, andThen, andThen, andThen, andThen, compose, compose, compose, compose, compose, compose, compose, compose, compose
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceMap
defaultReturnValue, defaultReturnValue, entrySet
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Constructor Detail
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Reference2ReferenceArrayMap
public Reference2ReferenceArrayMap(java.lang.Object[] key, java.lang.Object[] value)
Creates a new empty array map with given key and value backing arrays. The resulting map will have as many entries as the given arrays.It is responsibility of the caller that the elements of
key
are distinct.- Parameters:
key
- the key array.value
- the value array (it must have the same length askey
).
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Reference2ReferenceArrayMap
public Reference2ReferenceArrayMap()
Creates a new empty array map.
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Reference2ReferenceArrayMap
public Reference2ReferenceArrayMap(int capacity)
Creates a new empty array map of given capacity.- Parameters:
capacity
- the initial capacity.
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Reference2ReferenceArrayMap
public Reference2ReferenceArrayMap(Reference2ReferenceMap<K,V> m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Reference2ReferenceArrayMap
public Reference2ReferenceArrayMap(java.util.Map<? extends K,? extends V> m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Reference2ReferenceArrayMap
public Reference2ReferenceArrayMap(java.lang.Object[] key, java.lang.Object[] value, int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.It is responsibility of the caller that the first
size
elements ofkey
are distinct.- Parameters:
key
- the key array.value
- the value array (it must have the same length askey
).size
- the number of valid elements inkey
andvalue
.
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Method Detail
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reference2ReferenceEntrySet
public Reference2ReferenceMap.FastEntrySet<K,V> reference2ReferenceEntrySet()
Description copied from interface:Reference2ReferenceMap
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
Map.entrySet()
so that it returns anObjectSet
of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).- Specified by:
reference2ReferenceEntrySet
in interfaceReference2ReferenceMap<K,V>
- Returns:
- a type-specific set view of the mappings contained in this map.
- See Also:
Map.entrySet()
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get
public V get(java.lang.Object k)
Description copied from interface:Reference2ReferenceFunction
Returns the value to which the given key is mapped.- Specified by:
get
in interfaceFunction<K,V>
- Specified by:
get
in interfacejava.util.Map<K,V>
- Specified by:
get
in interfaceReference2ReferenceFunction<K,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)
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size
public int size()
Description copied from interface:Reference2ReferenceMap
Returns the number of key/value mappings in this map. If the map contains more thanInteger.MAX_VALUE
elements, returnsInteger.MAX_VALUE
.
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clear
public void clear()
Description copied from interface:Reference2ReferenceMap
Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
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containsKey
public boolean containsKey(java.lang.Object k)
Description copied from interface:Reference2ReferenceMap
Returns true if this function contains a mapping for the specified key.- Specified by:
containsKey
in interfaceFunction<K,V>
- Specified by:
containsKey
in interfacejava.util.Map<K,V>
- Specified by:
containsKey
in interfaceReference2ReferenceMap<K,V>
- Overrides:
containsKey
in classAbstractReference2ReferenceMap<K,V>
- Parameters:
k
- the key.- Returns:
- true if this function associates a value to
key
. - See Also:
Map.containsKey(Object)
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containsValue
public boolean containsValue(java.lang.Object v)
- Specified by:
containsValue
in interfacejava.util.Map<K,V>
- Overrides:
containsValue
in classAbstractReference2ReferenceMap<K,V>
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isEmpty
public boolean isEmpty()
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put
public V put(K k, V v)
Description copied from interface:Reference2ReferenceMap
Adds a pair to the map (optional operation).This default implementation just delegates to the corresponding function method.
- Specified by:
put
in interfaceFunction<K,V>
- Specified by:
put
in interfacejava.util.Map<K,V>
- Specified by:
put
in interfaceReference2ReferenceFunction<K,V>
- Specified by:
put
in interfaceReference2ReferenceMap<K,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)
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remove
public V remove(java.lang.Object k)
Description copied from interface:Reference2ReferenceMap
Removes the mapping with the given key (optional operation).This default implementation just delegates to the corresponding type-specific–function method.
- Specified by:
remove
in interfaceFunction<K,V>
- Specified by:
remove
in interfacejava.util.Map<K,V>
- Specified by:
remove
in interfaceReference2ReferenceFunction<K,V>
- Specified by:
remove
in interfaceReference2ReferenceMap<K,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)
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keySet
public ReferenceSet<K> keySet()
Description copied from class:AbstractReference2ReferenceMap
Returns a type-specific-set view of the keys of this map.The view is backed by the set returned by
Map.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 interfacejava.util.Map<K,V>
- Specified by:
keySet
in interfaceReference2ReferenceMap<K,V>
- Overrides:
keySet
in classAbstractReference2ReferenceMap<K,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()
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values
public ReferenceCollection<V> values()
Description copied from class:AbstractReference2ReferenceMap
Returns a type-specific-set view of the values of this map.The view is backed by the set returned by
Map.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 interfacejava.util.Map<K,V>
- Specified by:
values
in interfaceReference2ReferenceMap<K,V>
- Overrides:
values
in classAbstractReference2ReferenceMap<K,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()
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clone
public Reference2ReferenceArrayMap<K,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.
- Returns:
- a deep copy of this map.
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