Package it.unimi.dsi.fastutil.objects

Class Reference2BooleanFunctions.Singleton<K>

java.lang.Object
it.unimi.dsi.fastutil.objects.AbstractReference2BooleanFunction<K>
it.unimi.dsi.fastutil.objects.Reference2BooleanFunctions.Singleton<K>
All Implemented Interfaces:
Function<K,​Boolean>, Reference2BooleanFunction<K>, Serializable, Cloneable, Function<K,​Boolean>, Predicate<K>
Direct Known Subclasses:
Reference2BooleanMaps.Singleton
Enclosing class:
Reference2BooleanFunctions
public static class Reference2BooleanFunctions.Singleton<K>
extends AbstractReference2BooleanFunction<K>
implements Serializable, Cloneable
An immutable class representing a type-specific singleton function. Note that the default return value is still settable.

Note that albeit the function is immutable, its default return value may be changed.

This class may be useful to implement your own in case you subclass a type-specific function.

See Also:
Serialized Form

  • Method Details

    • containsKey

      public boolean containsKey​(Object k)
      Description copied from interface: Function
      Returns true if this function contains a mapping for the specified key.

      Note that for some kind of functions (e.g., hashes) this method will always return true. This default implementation, in particular, always return true.

      Specified by:
      containsKey in interface Function<K,​Boolean>
      Parameters:
      k - the key.
      Returns:
      true if this function associates a value to key.
      See Also:
      Map.containsKey(Object)

    • getBoolean

      public boolean getBoolean​(Object k)
      Description copied from interface: Reference2BooleanFunction
      Returns the value to which the given key is mapped.
      Specified by:
      getBoolean in interface Reference2BooleanFunction<K>
      Parameters:
      k - the key.
      Returns:
      the corresponding value, or the default return value if no value was present for the given key.
      See Also:
      Function.get(Object)

    • size

      public int size()
      Description copied from interface: Function
      Returns the intended number of keys in this function, or -1 if no such number exists.

      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. This default implementation, in particular, returns -1.

      Specified by:
      size in interface Function<K,​Boolean>
      Returns:
      the intended number of keys in this function, or -1 if that number is not available.

    • clone

      public Object clone()