public static class Object2LongFunctions.EmptyFunction<K> extends AbstractObject2LongFunction<K> implements Serializable, 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).
|
Object |
clone() |
boolean |
containsKey(Object k)
Returns true if this function contains a mapping for the specified key.
|
long |
defaultReturnValue()
Gets the default return value.
|
void |
defaultReturnValue(long defRetValue)
Sets the default return value.
|
long |
getLong(Object k)
Returns the value to which the given key is mapped.
|
int |
size()
Returns the intended number of keys in this function, or -1 if no such number exists.
|
get, put, put, remove, removeLong
public long getLong(Object k)
Object2LongFunction
getLong
in interface Object2LongFunction<K>
k
- the key.Function.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,Long>
k
- the key.key
.Map.containsKey(Object)
public long defaultReturnValue()
Object2LongFunction
defaultReturnValue
in interface Object2LongFunction<K>
defaultReturnValue
in class AbstractObject2LongFunction<K>
public void defaultReturnValue(long defRetValue)
Object2LongFunction
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 Object2LongFunction<K>
defaultReturnValue
in class AbstractObject2LongFunction<K>
defRetValue
- the new default return value.Object2LongFunction.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
clear
in interface Function<K,Long>
clear
in class AbstractObject2LongFunction<K>
Map.clear()