public class Double2DoubleArrayMap extends AbstractDouble2DoubleMap implements Serializable, Cloneable
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.
AbstractDouble2DoubleMap.BasicEntry
Double2DoubleMap.Entry, Double2DoubleMap.FastEntrySet
Constructor and Description |
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Double2DoubleArrayMap()
Creates a new empty array map.
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Double2DoubleArrayMap(double[] key,
double[] value)
Creates a new empty array map with given key and value backing arrays.
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Double2DoubleArrayMap(double[] key,
double[] value,
int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.
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Double2DoubleArrayMap(Double2DoubleMap m)
Creates a new empty array map copying the entries of a given map.
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Double2DoubleArrayMap(int capacity)
Creates a new empty array map of given capacity.
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Double2DoubleArrayMap(Map<? extends Double,? extends Double> m)
Creates a new empty array map copying the entries of a given map.
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Modifier and Type | Method and Description |
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void |
clear()
Removes all associations from this function (optional operation).
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Double2DoubleArrayMap |
clone()
Returns a deep copy of this map.
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boolean |
containsKey(double k)
Checks whether the given value is contained in
AbstractDouble2DoubleMap.keySet() . |
boolean |
containsValue(double v)
Checks whether the given value is contained in
AbstractDouble2DoubleMap.values() . |
Double2DoubleMap.FastEntrySet |
double2DoubleEntrySet()
Returns a type-specific set view of the mappings contained in this map.
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double |
get(double k)
Returns the value to which the given key is mapped.
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boolean |
isEmpty() |
DoubleSet |
keySet()
Returns a type-specific-set view of the keys of this map.
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double |
put(double k,
double v)
Adds a pair to the map.
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double |
remove(double k)
Removes the mapping with the given key.
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int |
size()
Returns the intended number of keys in this function, or -1 if no such number exists.
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DoubleCollection |
values()
Returns a type-specific-set view of the values of this map.
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containsValue, entrySet, equals, hashCode, putAll, toString
containsKey, defaultReturnValue, defaultReturnValue, get, put, remove
defaultReturnValue, defaultReturnValue
containsKey, get, put, remove
containsKey, get, put, remove
public Double2DoubleArrayMap(double[] key, double[] value)
It is responsibility of the caller that the elements of key
are distinct.
key
- the key array.value
- the value array (it must have the same length as key
).public Double2DoubleArrayMap()
public Double2DoubleArrayMap(int capacity)
capacity
- the initial capacity.public Double2DoubleArrayMap(Double2DoubleMap m)
m
- a map.public Double2DoubleArrayMap(Map<? extends Double,? extends Double> m)
m
- a map.public Double2DoubleArrayMap(double[] key, double[] value, int size)
It is responsibility of the caller that the first size
elements of key
are distinct.
key
- the key array.value
- the value array (it must have the same length as key
).size
- the number of valid elements in key
and value
.public Double2DoubleMap.FastEntrySet double2DoubleEntrySet()
Double2DoubleMap
This method is necessary because there is no inheritance along
type parameters: it is thus impossible to strengthen Double2DoubleMap.entrySet()
so that it returns an ObjectSet
of objects of type Map.Entry
(the latter makes it possible to
access keys and values with type-specific methods).
double2DoubleEntrySet
in interface Double2DoubleMap
Double2DoubleMap.entrySet()
public double get(double k)
Double2DoubleFunction
get
in interface Double2DoubleFunction
k
- the key.Function.get(Object)
public int size()
Function
Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.
public void clear()
Function
public boolean containsKey(double k)
AbstractDouble2DoubleMap
AbstractDouble2DoubleMap.keySet()
.containsKey
in interface Double2DoubleFunction
containsKey
in class AbstractDouble2DoubleMap
Function.containsKey(Object)
public boolean containsValue(double v)
AbstractDouble2DoubleMap
AbstractDouble2DoubleMap.values()
.containsValue
in interface Double2DoubleMap
containsValue
in class AbstractDouble2DoubleMap
Map.containsValue(Object)
public boolean isEmpty()
public double put(double k, double v)
Double2DoubleFunction
put
in interface Double2DoubleFunction
put
in class AbstractDouble2DoubleFunction
k
- the key.v
- the value.Function.put(Object,Object)
public double remove(double k)
Double2DoubleFunction
remove
in interface Double2DoubleFunction
remove
in class AbstractDouble2DoubleFunction
k
- the key.Function.remove(Object)
public DoubleSet keySet()
AbstractDouble2DoubleMap
The view is backed by the set returned by AbstractDouble2DoubleMap.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.
keySet
in interface Double2DoubleMap
keySet
in interface Map<Double,Double>
keySet
in class AbstractDouble2DoubleMap
Map.keySet()
public DoubleCollection values()
AbstractDouble2DoubleMap
The view is backed by the set returned by AbstractDouble2DoubleMap.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.
values
in interface Double2DoubleMap
values
in interface Map<Double,Double>
values
in class AbstractDouble2DoubleMap
Map.values()
public Double2DoubleArrayMap clone()
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.