Class AbstractReference2ObjectMap<K,V>
- java.lang.Object
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- it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction<K,V>
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- it.unimi.dsi.fastutil.objects.AbstractReference2ObjectMap<K,V>
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- All Implemented Interfaces:
Function<K,V>
,Reference2ObjectFunction<K,V>
,Reference2ObjectMap<K,V>
,java.io.Serializable
,java.util.function.Function<K,V>
,java.util.Map<K,V>
- Direct Known Subclasses:
AbstractReference2ObjectSortedMap
,Reference2ObjectArrayMap
,Reference2ObjectOpenCustomHashMap
,Reference2ObjectOpenHashMap
public abstract class AbstractReference2ObjectMap<K,V> extends AbstractReference2ObjectFunction<K,V> implements Reference2ObjectMap<K,V>, java.io.Serializable
An abstract class providing basic methods for maps implementing a type-specific interface.Optional operations just throw an
UnsupportedOperationException
. Generic versions of accessors delegate to the corresponding type-specific counterparts following the interface rules (they take care of returningnull
on a missing key).As a further help, this class provides a
BasicEntry
inner class that implements a type-specific version ofMap.Entry
; it is particularly useful for those classes that do not implement their own entries (e.g., most immutable maps).- See Also:
- Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
AbstractReference2ObjectMap.BasicEntry<K,V>
This class provides a basic but complete type-specific entry class for all those maps implementations that do not have entries on their own (e.g., most immutable maps).static class
AbstractReference2ObjectMap.BasicEntrySet<K,V>
This class provides a basic implementation for an Entry set which forwards some queries to the map.-
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectMap
Reference2ObjectMap.Entry<K,V>, Reference2ObjectMap.FastEntrySet<K,V>
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
containsKey(java.lang.Object k)
Returns true if this function contains a mapping for the specified key.boolean
containsValue(java.lang.Object v)
boolean
equals(java.lang.Object o)
int
hashCode()
Returns a hash code for this map.boolean
isEmpty()
ReferenceSet<K>
keySet()
Returns a type-specific-set view of the keys of this map.void
putAll(java.util.Map<? extends K,? extends V> m)
java.lang.String
toString()
ObjectCollection<V>
values()
Returns a type-specific-set view of the values of this map.-
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction
defaultReturnValue, defaultReturnValue
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Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, get, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectFunction
andThen, andThen, andThen, andThen, andThen, andThen, andThen, andThen, andThen, compose, compose, compose, compose, compose, compose, compose, compose, compose, get
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectMap
clear, defaultReturnValue, defaultReturnValue, entrySet, put, reference2ObjectEntrySet, remove, size
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Method Detail
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containsValue
public boolean containsValue(java.lang.Object v)
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containsKey
public boolean containsKey(java.lang.Object k)
Description copied from interface:Reference2ObjectMap
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 interfaceReference2ObjectMap<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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keySet
public ReferenceSet<K> keySet()
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.
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values
public ObjectCollection<V> values()
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.
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hashCode
public int hashCode()
Returns a hash code for this map. The hash code of a map is computed by summing the hash codes of its entries.
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equals
public boolean equals(java.lang.Object o)
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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