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java.lang.Objectit.unimi.dsi.fastutil.objects.AbstractObject2ReferenceFunction<K,V>
it.unimi.dsi.fastutil.objects.Object2ReferenceFunctions.EmptyFunction<K,V>
public static class Object2ReferenceFunctions.EmptyFunction<K,V>
An immutable class representing an empty type-specific function.
This class may be useful to implement your own in case you subclass a type-specific function.
Field Summary | |
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static long |
serialVersionUID
|
Method Summary | |
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void |
clear()
Removes all associations from this function (optional operation). |
Object |
clone()
|
boolean |
containsKey(Object k)
Returns true if this function contains a mapping for the specified key. |
V |
defaultReturnValue()
Gets the default return value. |
void |
defaultReturnValue(V defRetValue)
Sets the default return value. |
V |
get(Object k)
Returns the value associated by this function to the specified key. |
int |
size()
Returns the intended number of keys in this function, or -1 if no such number exists. |
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2ReferenceFunction |
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put, remove |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final long serialVersionUID
Method Detail |
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public V get(Object k)
Function
get
in interface Function<K,V>
k
- the key.
null
if no value was present for the given key.Map.get(Object)
public boolean containsKey(Object k)
Function
Note that for some kind of functions (e.g., hashes) this method will always return true.
containsKey
in interface Function<K,V>
k
- the key.
key
.Map.containsKey(Object)
public V defaultReturnValue()
Object2ReferenceFunction
defaultReturnValue
in interface Object2ReferenceFunction<K,V>
defaultReturnValue
in class AbstractObject2ReferenceFunction<K,V>
public void defaultReturnValue(V defRetValue)
Object2ReferenceFunction
get()
, put()
and remove()
to
denote that the map does not contain the specified key. It must be
0/false
/null
by default.
defaultReturnValue
in interface Object2ReferenceFunction<K,V>
defaultReturnValue
in class AbstractObject2ReferenceFunction<K,V>
defRetValue
- the new default return value.Object2ReferenceFunction.defaultReturnValue()
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.
size
in interface Function<K,V>
public void clear()
Function
clear
in interface Function<K,V>
clear
in class AbstractObject2ReferenceFunction<K,V>
Map.clear()
public Object clone()
clone
in class Object
|
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