Class Object2ObjectArrayMap<K,V>
- java.lang.Object
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- it.unimi.dsi.fastutil.objects.AbstractObject2ObjectFunction<K,V>
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- it.unimi.dsi.fastutil.objects.AbstractObject2ObjectMap<K,V>
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- it.unimi.dsi.fastutil.objects.Object2ObjectArrayMap<K,V>
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- All Implemented Interfaces:
Function<K,V>
,Object2ObjectFunction<K,V>
,Object2ObjectMap<K,V>
,java.io.Serializable
,java.lang.Cloneable
,java.util.function.Function<K,V>
,java.util.Map<K,V>
public class Object2ObjectArrayMap<K,V> extends AbstractObject2ObjectMap<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.AbstractObject2ObjectMap
AbstractObject2ObjectMap.BasicEntry<K,V>, AbstractObject2ObjectMap.BasicEntrySet<K,V>
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Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Object2ObjectMap
Object2ObjectMap.Entry<K,V>, Object2ObjectMap.FastEntrySet<K,V>
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Constructor Summary
Constructors Constructor Description Object2ObjectArrayMap()
Creates a new empty array map.Object2ObjectArrayMap(int capacity)
Creates a new empty array map of given capacity.Object2ObjectArrayMap(Object2ObjectMap<K,V> m)
Creates a new empty array map copying the entries of a given map.Object2ObjectArrayMap(java.lang.Object[] key, java.lang.Object[] value)
Creates a new empty array map with given key and value backing arrays.Object2ObjectArrayMap(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.Object2ObjectArrayMap(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).Object2ObjectArrayMap<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()
ObjectSet<K>
keySet()
Returns a type-specific-set view of the keys of this map.Object2ObjectMap.FastEntrySet<K,V>
object2ObjectEntrySet()
Returns a type-specific set view of the mappings contained in this map.V
put(K k, V v)
Adds a pair to the map (optional operation).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.ObjectCollection<V>
values()
Returns a type-specific-set view of the values of this map.-
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2ObjectMap
equals, hashCode, putAll, toString
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Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2ObjectFunction
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.Object2ObjectMap
defaultReturnValue, defaultReturnValue, entrySet
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Constructor Detail
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Object2ObjectArrayMap
public Object2ObjectArrayMap(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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Object2ObjectArrayMap
public Object2ObjectArrayMap()
Creates a new empty array map.
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Object2ObjectArrayMap
public Object2ObjectArrayMap(int capacity)
Creates a new empty array map of given capacity.- Parameters:
capacity
- the initial capacity.
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Object2ObjectArrayMap
public Object2ObjectArrayMap(Object2ObjectMap<K,V> m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Object2ObjectArrayMap
public Object2ObjectArrayMap(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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Object2ObjectArrayMap
public Object2ObjectArrayMap(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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object2ObjectEntrySet
public Object2ObjectMap.FastEntrySet<K,V> object2ObjectEntrySet()
Description copied from interface:Object2ObjectMap
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:
object2ObjectEntrySet
in interfaceObject2ObjectMap<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:Object2ObjectFunction
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 interfaceObject2ObjectFunction<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:Object2ObjectMap
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:Object2ObjectMap
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:Object2ObjectMap
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 interfaceObject2ObjectMap<K,V>
- Overrides:
containsKey
in classAbstractObject2ObjectMap<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 classAbstractObject2ObjectMap<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:Object2ObjectMap
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 interfaceObject2ObjectFunction<K,V>
- Specified by:
put
in interfaceObject2ObjectMap<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:Object2ObjectMap
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 interfaceObject2ObjectFunction<K,V>
- Specified by:
remove
in interfaceObject2ObjectMap<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 ObjectSet<K> keySet()
Description copied from class:AbstractObject2ObjectMap
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 interfaceObject2ObjectMap<K,V>
- Overrides:
keySet
in classAbstractObject2ObjectMap<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 ObjectCollection<V> values()
Description copied from class:AbstractObject2ObjectMap
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 interfaceObject2ObjectMap<K,V>
- Overrides:
values
in classAbstractObject2ObjectMap<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 Object2ObjectArrayMap<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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