Class Reference2LongArrayMap<K>
- java.lang.Object
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- it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction<K>
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- it.unimi.dsi.fastutil.objects.AbstractReference2LongMap<K>
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- it.unimi.dsi.fastutil.objects.Reference2LongArrayMap<K>
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- All Implemented Interfaces:
Function<K,java.lang.Long>
,Reference2LongFunction<K>
,Reference2LongMap<K>
,java.io.Serializable
,java.lang.Cloneable
,java.util.function.Function<K,java.lang.Long>
,java.util.function.ToLongFunction<K>
,java.util.Map<K,java.lang.Long>
public class Reference2LongArrayMap<K> extends AbstractReference2LongMap<K> 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.AbstractReference2LongMap
AbstractReference2LongMap.BasicEntry<K>, AbstractReference2LongMap.BasicEntrySet<K>
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Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongMap
Reference2LongMap.Entry<K>, Reference2LongMap.FastEntrySet<K>
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Constructor Summary
Constructors Constructor Description Reference2LongArrayMap()
Creates a new empty array map.Reference2LongArrayMap(int capacity)
Creates a new empty array map of given capacity.Reference2LongArrayMap(Reference2LongMap<K> m)
Creates a new empty array map copying the entries of a given map.Reference2LongArrayMap(java.lang.Object[] key, long[] value)
Creates a new empty array map with given key and value backing arrays.Reference2LongArrayMap(java.lang.Object[] key, long[] value, int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.Reference2LongArrayMap(java.util.Map<? extends K,? extends java.lang.Long> 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).Reference2LongArrayMap<K>
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(long v)
Returnstrue
if this map maps one or more keys to the specified value.long
getLong(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.long
put(K k, long v)
Adds a pair to the map (optional operation).Reference2LongMap.FastEntrySet<K>
reference2LongEntrySet()
Returns a type-specific set view of the mappings contained in this map.long
removeLong(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.LongCollection
values()
Returns a type-specific-set view of the values of this map.-
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2LongMap
equals, hashCode, putAll, toString
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Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction
defaultReturnValue, defaultReturnValue
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Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, replaceAll
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongFunction
applyAsLong
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongMap
computeLong, computeLongIfAbsent, computeLongIfAbsentPartial, computeLongIfPresent, containsValue, defaultReturnValue, defaultReturnValue, entrySet, get, getOrDefault, getOrDefault, merge, mergeLong, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace
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Constructor Detail
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Reference2LongArrayMap
public Reference2LongArrayMap(java.lang.Object[] key, long[] 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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Reference2LongArrayMap
public Reference2LongArrayMap()
Creates a new empty array map.
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Reference2LongArrayMap
public Reference2LongArrayMap(int capacity)
Creates a new empty array map of given capacity.- Parameters:
capacity
- the initial capacity.
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Reference2LongArrayMap
public Reference2LongArrayMap(Reference2LongMap<K> m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Reference2LongArrayMap
public Reference2LongArrayMap(java.util.Map<? extends K,? extends java.lang.Long> m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Reference2LongArrayMap
public Reference2LongArrayMap(java.lang.Object[] key, long[] 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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reference2LongEntrySet
public Reference2LongMap.FastEntrySet<K> reference2LongEntrySet()
Description copied from interface:Reference2LongMap
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:
reference2LongEntrySet
in interfaceReference2LongMap<K>
- Returns:
- a type-specific set view of the mappings contained in this map.
- See Also:
Map.entrySet()
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getLong
public long getLong(java.lang.Object k)
Description copied from interface:Reference2LongFunction
Returns the value to which the given key is mapped.- Specified by:
getLong
in interfaceReference2LongFunction<K>
- 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:Reference2LongMap
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:Reference2LongMap
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:Reference2LongMap
Returns true if this function contains a mapping for the specified key.- Specified by:
containsKey
in interfaceFunction<K,java.lang.Long>
- Specified by:
containsKey
in interfacejava.util.Map<K,java.lang.Long>
- Specified by:
containsKey
in interfaceReference2LongMap<K>
- Overrides:
containsKey
in classAbstractReference2LongMap<K>
- 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(long v)
Description copied from interface:Reference2LongMap
Returnstrue
if this map maps one or more keys to the specified value.- Specified by:
containsValue
in interfaceReference2LongMap<K>
- Overrides:
containsValue
in classAbstractReference2LongMap<K>
- See Also:
Map.containsValue(Object)
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isEmpty
public boolean isEmpty()
- Specified by:
isEmpty
in interfacejava.util.Map<K,java.lang.Long>
- Overrides:
isEmpty
in classAbstractReference2LongMap<K>
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put
public long put(K k, long v)
Description copied from interface:Reference2LongFunction
Adds a pair to the map (optional operation).- Specified by:
put
in interfaceReference2LongFunction<K>
- 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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removeLong
public long removeLong(java.lang.Object k)
Description copied from interface:Reference2LongFunction
Removes the mapping with the given key (optional operation).- Specified by:
removeLong
in interfaceReference2LongFunction<K>
- 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:AbstractReference2LongMap
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,java.lang.Long>
- Specified by:
keySet
in interfaceReference2LongMap<K>
- Overrides:
keySet
in classAbstractReference2LongMap<K>
- 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 LongCollection values()
Description copied from class:AbstractReference2LongMap
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,java.lang.Long>
- Specified by:
values
in interfaceReference2LongMap<K>
- Overrides:
values
in classAbstractReference2LongMap<K>
- 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 Reference2LongArrayMap<K> 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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