public class Long2LongArrayMap extends AbstractLong2LongMap implements java.io.Serializable, java.lang.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.
AbstractLong2LongMap.BasicEntry
Long2LongMap.Entry, Long2LongMap.FastEntrySet
Constructor and Description |
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Long2LongArrayMap()
Creates a new empty array map.
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Long2LongArrayMap(int capacity)
Creates a new empty array map of given capacity.
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Long2LongArrayMap(long[] key,
long[] value)
Creates a new empty array map with given key and value backing arrays.
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Long2LongArrayMap(long[] key,
long[] 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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Long2LongArrayMap(Long2LongMap m)
Creates a new empty array map copying the entries of a given map.
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Long2LongArrayMap(java.util.Map<? extends java.lang.Long,? extends java.lang.Long> 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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Long2LongArrayMap |
clone()
Returns a deep copy of this map.
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boolean |
containsKey(long k)
Checks whether the given value is contained in
AbstractLong2LongMap.keySet() . |
boolean |
containsValue(long v)
Checks whether the given value is contained in
AbstractLong2LongMap.values() . |
long |
get(long k)
Returns the value to which the given key is mapped.
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boolean |
isEmpty() |
LongSet |
keySet()
Returns a type-specific-set view of the keys of this map.
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Long2LongMap.FastEntrySet |
long2LongEntrySet()
Returns a type-specific set view of the mappings contained in this map.
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long |
put(long k,
long v)
Adds a pair to the map.
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long |
remove(long 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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LongCollection |
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
public Long2LongArrayMap(long[] key, long[] 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 Long2LongArrayMap()
public Long2LongArrayMap(int capacity)
capacity
- the initial capacity.public Long2LongArrayMap(Long2LongMap m)
m
- a map.public Long2LongArrayMap(java.util.Map<? extends java.lang.Long,? extends java.lang.Long> m)
m
- a map.public Long2LongArrayMap(long[] key, long[] 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 Long2LongMap.FastEntrySet long2LongEntrySet()
Long2LongMap
This method is necessary because there is no inheritance along
type parameters: it is thus impossible to strengthen Long2LongMap.entrySet()
so that it returns an ObjectSet
of type-specific entries (the latter makes it possible to
access keys and values with type-specific methods).
long2LongEntrySet
in interface Long2LongMap
Long2LongMap.entrySet()
public long get(long k)
Long2LongFunction
get
in interface Long2LongFunction
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
clear
in interface Function<java.lang.Long,java.lang.Long>
clear
in interface java.util.Map<java.lang.Long,java.lang.Long>
clear
in class AbstractLong2LongFunction
Map.clear()
public boolean containsKey(long k)
AbstractLong2LongMap
AbstractLong2LongMap.keySet()
.containsKey
in interface Long2LongFunction
containsKey
in class AbstractLong2LongMap
Function.containsKey(Object)
public boolean containsValue(long v)
AbstractLong2LongMap
AbstractLong2LongMap.values()
.containsValue
in interface Long2LongMap
containsValue
in class AbstractLong2LongMap
Map.containsValue(Object)
public boolean isEmpty()
isEmpty
in interface java.util.Map<java.lang.Long,java.lang.Long>
isEmpty
in class AbstractLong2LongMap
public long put(long k, long v)
Long2LongFunction
put
in interface Long2LongFunction
put
in class AbstractLong2LongFunction
k
- the key.v
- the value.Function.put(Object,Object)
public long remove(long k)
Long2LongFunction
remove
in interface Long2LongFunction
remove
in class AbstractLong2LongFunction
k
- the key.Function.remove(Object)
public LongSet keySet()
AbstractLong2LongMap
The view is backed by the set returned by AbstractLong2LongMap.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 Long2LongMap
keySet
in interface java.util.Map<java.lang.Long,java.lang.Long>
keySet
in class AbstractLong2LongMap
Map.keySet()
public LongCollection values()
AbstractLong2LongMap
The view is backed by the set returned by AbstractLong2LongMap.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 Long2LongMap
values
in interface java.util.Map<java.lang.Long,java.lang.Long>
values
in class AbstractLong2LongMap
Map.values()
public Long2LongArrayMap 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.
clone
in class java.lang.Object