public static class Reference2ObjectFunctions.EmptyFunction<K,V> extends AbstractReference2ObjectFunction<K,V> implements java.io.Serializable, java.lang.Cloneable
This class may be useful to implement your own in case you subclass a type-specific function.
Modifier and Type | Method and Description |
---|---|
void |
clear()
Removes all associations from this function (optional operation).
|
java.lang.Object |
clone() |
boolean |
containsKey(java.lang.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(java.lang.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.
|
put, remove
public V get(java.lang.Object k)
Function
public boolean containsKey(java.lang.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()
Reference2ObjectFunction
defaultReturnValue
in interface Reference2ObjectFunction<K,V>
defaultReturnValue
in class AbstractReference2ObjectFunction<K,V>
public void defaultReturnValue(V defRetValue)
Reference2ObjectFunction
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 Reference2ObjectFunction<K,V>
defaultReturnValue
in class AbstractReference2ObjectFunction<K,V>
defRetValue
- the new default return value.Reference2ObjectFunction.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.
public void clear()
Function
public java.lang.Object clone()
clone
in class java.lang.Object