Package it.unimi.dsi.fastutil.objects

Class Object2ByteFunctions.EmptyFunction<K>

java.lang.Object
it.unimi.dsi.fastutil.objects.AbstractObject2ByteFunction<K>
it.unimi.dsi.fastutil.objects.Object2ByteFunctions.EmptyFunction<K>
All Implemented Interfaces:
Function<K,​Byte>, Object2ByteFunction<K>, Serializable, Cloneable, Function<K,​Byte>, ToIntFunction<K>
Direct Known Subclasses:
Object2ByteMaps.EmptyMap
Enclosing class:
Object2ByteFunctions
public static class Object2ByteFunctions.EmptyFunction<K>
extends AbstractObject2ByteFunction<K>
implements Serializable, 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

    • getByte

      public byte getByte​(Object k)
      Description copied from interface: Object2ByteFunction
      Returns the value to which the given key is mapped.
      Specified by:
      getByte in interface Object2ByteFunction<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)

    • 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,​Byte>
      Parameters:
      k - the key.
      Returns:
      true if this function associates a value to key.
      See Also:
      Map.containsKey(Object)

    • defaultReturnValue

      public byte defaultReturnValue()
      Description copied from interface: Object2ByteFunction
      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 Object2ByteFunction<K>
      Overrides:
      defaultReturnValue in class AbstractObject2ByteFunction<K>
      Returns:
      the current default return value.

    • defaultReturnValue

      public void defaultReturnValue​(byte defRetValue)
      Description copied from interface: Object2ByteFunction
      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 Object2ByteFunction<K>
      Overrides:
      defaultReturnValue in class AbstractObject2ByteFunction<K>
      Parameters:
      defRetValue - the new default return value.
      See Also:
      Object2ByteFunction.defaultReturnValue()

    • 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,​Byte>
      Returns:
      the intended number of keys in this function, or -1 if that number is not available.

    • clear

      public void clear()
      Description copied from interface: Function
      Removes all associations from this function (optional operation).
      Specified by:
      clear in interface Function<K,​Byte>
      See Also:
      Map.clear()

    • clone

      public Object clone()

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • equals

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

    • toString

      public String toString()
      Overrides:
      toString in class Object