AbstractReference2LongFunction (fastutil 8.2.3)

java.lang.Object
- it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction<K>

All Implemented Interfaces:

Function<K,Long>, Reference2LongFunction<K>, Serializable, Function<K,Long>, ToLongFunction<K>

Direct Known Subclasses:

AbstractReference2LongMap, Reference2LongFunctions.EmptyFunction, Reference2LongFunctions.Singleton, Reference2LongFunctions.UnmodifiableFunction
```
public abstract class AbstractReference2LongFunction<K>
extends Object
implements Reference2LongFunction<K>, Serializable
```
An abstract class providing basic methods for functions implementing a type-specific interface.
This class handles directly a default return value (including methods to access it). Instances of classes inheriting from this class have just to return defRetValue to denote lack of a key in type-specific methods. The value is serialized.
Implementing subclasses have just to provide type-specific get(), type-specific containsKey(), and size() methods.

See Also:

Serialized Form

- Method Summary
  
  Modifier and Type Method Description
  
  long defaultReturnValue()
  Gets the default return value.
  
  void defaultReturnValue(long rv)
  Sets the default return value (optional operation).
  - Methods inherited from class java.lang.Object
    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface it.unimi.dsi.fastutil.Function
    apply, clear, containsKey, size
  - Methods inherited from interface java.util.function.Function
    andThen, compose
  - Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongFunction
    applyAsLong, get, getLong, put, put, remove, removeLong

- Method Detail
  - defaultReturnValue
```
public void defaultReturnValue(long rv)
```
    Description copied from interface: Reference2LongFunction
    
    Sets the default return value (optional operation). This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be 0/false/null by default.
    
    Specified by:
    
    defaultReturnValue in interface Reference2LongFunction<K>
    
    Parameters:
    
    rv - the new default return value.
    
    See Also:
    
    Reference2LongFunction.defaultReturnValue()
  - defaultReturnValue
```
public long defaultReturnValue()
```
    Description copied from interface: Reference2LongFunction
    
    Gets the default return value.
    This default implementation just return the default null value of the type (null for objects, 0 for scalars, false for Booleans).
    
    Specified by:
    
    defaultReturnValue in interface Reference2LongFunction<K>
    
    Returns:
    
    the current default return value.