Class Long2DoubleArrayMap
- java.lang.Object
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- it.unimi.dsi.fastutil.longs.AbstractLong2DoubleFunction
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- it.unimi.dsi.fastutil.longs.AbstractLong2DoubleMap
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- it.unimi.dsi.fastutil.longs.Long2DoubleArrayMap
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- All Implemented Interfaces:
Function<java.lang.Long,java.lang.Double>
,Long2DoubleFunction
,Long2DoubleMap
,java.io.Serializable
,java.lang.Cloneable
,java.util.function.Function<java.lang.Long,java.lang.Double>
,java.util.function.LongToDoubleFunction
,java.util.Map<java.lang.Long,java.lang.Double>
public class Long2DoubleArrayMap extends AbstractLong2DoubleMap 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.longs.AbstractLong2DoubleMap
AbstractLong2DoubleMap.BasicEntry, AbstractLong2DoubleMap.BasicEntrySet
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Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.longs.Long2DoubleMap
Long2DoubleMap.Entry, Long2DoubleMap.FastEntrySet
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Constructor Summary
Constructors Constructor Description Long2DoubleArrayMap()
Creates a new empty array map.Long2DoubleArrayMap(int capacity)
Creates a new empty array map of given capacity.Long2DoubleArrayMap(long[] key, double[] value)
Creates a new empty array map with given key and value backing arrays.Long2DoubleArrayMap(long[] key, double[] value, int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.Long2DoubleArrayMap(Long2DoubleMap m)
Creates a new empty array map copying the entries of a given map.Long2DoubleArrayMap(java.util.Map<? extends java.lang.Long,? extends java.lang.Double> 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).Long2DoubleArrayMap
clone()
Returns a deep copy of this map.boolean
containsKey(long k)
Returns true if this function contains a mapping for the specified key.boolean
containsValue(double v)
Returnstrue
if this map maps one or more keys to the specified value.double
get(long k)
Returns the value to which the given key is mapped.boolean
isEmpty()
LongSet
keySet()
Returns a type-specific-set view of the keys of this map.Long2DoubleMap.FastEntrySet
long2DoubleEntrySet()
Returns a type-specific set view of the mappings contained in this map.double
put(long k, double v)
Adds a pair to the map (optional operation).double
remove(long k)
Removes the mapping with the given key (optional operation).int
size()
Returns the number of key/value mappings in this map.DoubleCollection
values()
Returns a type-specific-set view of the values of this map.-
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2DoubleMap
equals, hashCode, putAll, toString
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Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2DoubleFunction
defaultReturnValue, defaultReturnValue
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Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2DoubleFunction
andThen, andThen, andThen, andThen, andThen, andThen, andThen, andThen, andThen, applyAsDouble, compose, compose, compose, compose, compose, compose, compose, compose, compose
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Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2DoubleMap
compute, compute, computeIfAbsent, computeIfAbsent, computeIfAbsentNullable, computeIfAbsentPartial, computeIfPresent, computeIfPresent, containsKey, containsValue, defaultReturnValue, defaultReturnValue, entrySet, get, getOrDefault, getOrDefault, merge, merge, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace
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Constructor Detail
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Long2DoubleArrayMap
public Long2DoubleArrayMap(long[] key, double[] 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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Long2DoubleArrayMap
public Long2DoubleArrayMap()
Creates a new empty array map.
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Long2DoubleArrayMap
public Long2DoubleArrayMap(int capacity)
Creates a new empty array map of given capacity.- Parameters:
capacity
- the initial capacity.
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Long2DoubleArrayMap
public Long2DoubleArrayMap(Long2DoubleMap m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Long2DoubleArrayMap
public Long2DoubleArrayMap(java.util.Map<? extends java.lang.Long,? extends java.lang.Double> m)
Creates a new empty array map copying the entries of a given map.- Parameters:
m
- a map.
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Long2DoubleArrayMap
public Long2DoubleArrayMap(long[] key, double[] 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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long2DoubleEntrySet
public Long2DoubleMap.FastEntrySet long2DoubleEntrySet()
Description copied from interface:Long2DoubleMap
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:
long2DoubleEntrySet
in interfaceLong2DoubleMap
- Returns:
- a type-specific set view of the mappings contained in this map.
- See Also:
Map.entrySet()
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get
public double get(long k)
Description copied from interface:Long2DoubleFunction
Returns the value to which the given key is mapped.- Specified by:
get
in interfaceLong2DoubleFunction
- 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:Long2DoubleMap
Returns the number of key/value mappings in this map. If the map contains more thanInteger.MAX_VALUE
elements, returnsInteger.MAX_VALUE
.- Specified by:
size
in interfaceFunction<java.lang.Long,java.lang.Double>
- Specified by:
size
in interfaceLong2DoubleMap
- Specified by:
size
in interfacejava.util.Map<java.lang.Long,java.lang.Double>
- Returns:
- the number of key-value mappings in this map.
- See Also:
Size64
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clear
public void clear()
Description copied from interface:Long2DoubleMap
Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.- Specified by:
clear
in interfaceFunction<java.lang.Long,java.lang.Double>
- Specified by:
clear
in interfaceLong2DoubleMap
- Specified by:
clear
in interfacejava.util.Map<java.lang.Long,java.lang.Double>
- See Also:
Map.clear()
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containsKey
public boolean containsKey(long k)
Description copied from interface:Long2DoubleMap
Returns true if this function contains a mapping for the specified key.- Specified by:
containsKey
in interfaceLong2DoubleFunction
- Specified by:
containsKey
in interfaceLong2DoubleMap
- Overrides:
containsKey
in classAbstractLong2DoubleMap
- 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(double v)
Description copied from interface:Long2DoubleMap
Returnstrue
if this map maps one or more keys to the specified value.- Specified by:
containsValue
in interfaceLong2DoubleMap
- Overrides:
containsValue
in classAbstractLong2DoubleMap
- See Also:
Map.containsValue(Object)
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isEmpty
public boolean isEmpty()
- Specified by:
isEmpty
in interfacejava.util.Map<java.lang.Long,java.lang.Double>
- Overrides:
isEmpty
in classAbstractLong2DoubleMap
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put
public double put(long k, double v)
Description copied from interface:Long2DoubleFunction
Adds a pair to the map (optional operation).- Specified by:
put
in interfaceLong2DoubleFunction
- 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 double remove(long k)
Description copied from interface:Long2DoubleFunction
Removes the mapping with the given key (optional operation).- Specified by:
remove
in interfaceLong2DoubleFunction
- 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 LongSet keySet()
Description copied from class:AbstractLong2DoubleMap
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 interfaceLong2DoubleMap
- Specified by:
keySet
in interfacejava.util.Map<java.lang.Long,java.lang.Double>
- Overrides:
keySet
in classAbstractLong2DoubleMap
- 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 DoubleCollection values()
Description copied from class:AbstractLong2DoubleMap
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 interfaceLong2DoubleMap
- Specified by:
values
in interfacejava.util.Map<java.lang.Long,java.lang.Double>
- Overrides:
values
in classAbstractLong2DoubleMap
- 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 Long2DoubleArrayMap 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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