Package it.unimi.dsi.fastutil.objects

Class Reference2ReferenceFunctions.EmptyFunction<K,​V>

java.lang.Object
it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,​V>
it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.EmptyFunction<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.EmptyMap
Enclosing class:
Reference2ReferenceFunctions
public static class Reference2ReferenceFunctions.EmptyFunction<K,​V>
extends AbstractReference2ReferenceFunction<K,​V>
implements java.io.Serializable, java.lang.Cloneable
An immutable class representing an empty type-specific function.

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

See Also:
Serialized Form

  • Method Details

    • 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)

    • containsKey

      public boolean containsKey​(java.lang.Object k)
      Specified by:
      containsKey in interface it.unimi.dsi.fastutil.Function<K,​V>

    • defaultReturnValue

      public V defaultReturnValue()
      Description copied from interface: Reference2ReferenceFunction
      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 Reference2ReferenceFunction<K,​V>
      Overrides:
      defaultReturnValue in class AbstractReference2ReferenceFunction<K,​V>
      Returns:
      the current default return value.

    • defaultReturnValue

      public void defaultReturnValue​(V defRetValue)
      Description copied from interface: Reference2ReferenceFunction
      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 Reference2ReferenceFunction<K,​V>
      Overrides:
      defaultReturnValue in class AbstractReference2ReferenceFunction<K,​V>
      Parameters:
      defRetValue - the new default return value.
      See Also:
      Reference2ReferenceFunction.defaultReturnValue()

    • size

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

    • clear

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

    • clone

      public java.lang.Object clone()

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class java.lang.Object

    • equals

      public boolean equals​(java.lang.Object o)
      Overrides:
      equals in class java.lang.Object

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class java.lang.Object