Package it.unimi.dsi.fastutil.objects

Class Reference2ReferenceFunctions.Singleton<K,​V>

java.lang.Object
it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,​V>
it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.Singleton<K,​V>
All Implemented Interfaces:
it.unimi.dsi.fastutil.Function<K,​V>, Reference2ReferenceFunction<K,​V>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<K,​V>
Direct Known Subclasses:
Reference2ReferenceMaps.Singleton
Enclosing class:
Reference2ReferenceFunctions
public static class Reference2ReferenceFunctions.Singleton<K,​V>
extends AbstractReference2ReferenceFunction<K,​V>
implements java.io.Serializable, java.lang.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​(java.lang.Object k)
      Specified by:
      containsKey in interface it.unimi.dsi.fastutil.Function<K,​V>

    • get

      public V get​(java.lang.Object k)
      Description copied from interface: Reference2ReferenceFunction
      Returns the value to which the given key is mapped.
      Specified by:
      get in interface it.unimi.dsi.fastutil.Function<K,​V>
      Specified by:
      get in interface Reference2ReferenceFunction<K,​V>
      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)

    • getOrDefault

      public V getOrDefault​(java.lang.Object k, V defaultValue)
      Description copied from interface: Reference2ReferenceFunction
      Returns the value associated by this function to the specified key, or give the specified value if not present.
      Specified by:
      getOrDefault in interface it.unimi.dsi.fastutil.Function<K,​V>
      Specified by:
      getOrDefault in interface Reference2ReferenceFunction<K,​V>
      Parameters:
      k - the key.
      defaultValue - the value to return if not present.
      Returns:
      the corresponding value, or defaultValue if no value was present for the given key.
      See Also:
      Function.getOrDefault(Object, Object)

    • size

      public int size()
      Specified by:
      size in interface it.unimi.dsi.fastutil.Function<K,​V>

    • clone

      public java.lang.Object clone()