Package it.unimi.dsi.fastutil.objects

Interface Reference2FloatFunction<K>

All Superinterfaces:
it.unimi.dsi.fastutil.Function<K,​java.lang.Float>, java.util.function.Function<K,​java.lang.Float>, java.util.function.ToDoubleFunction<K>
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface
public interface Reference2FloatFunction<K>
extends it.unimi.dsi.fastutil.Function<K,​java.lang.Float>, java.util.function.ToDoubleFunction<K>
A type-specific Function; provides some additional methods that use polymorphism to avoid (un)boxing.

Type-specific versions of get(), put() and remove() cannot rely on null to denote absence of a key. Rather, they return a default return value, which is set to 0/false at creation, but can be changed using the defaultReturnValue() method.

For uniformity reasons, even functions returning objects implement the default return value (of course, in this case the default return value is initialized to null).

The default implementation of optional operations just throw an UnsupportedOperationException, except for the type-specific containsKey(), which return true. Generic versions of accessors delegate to the corresponding type-specific counterparts following the interface rules.

Warning: to fall in line as much as possible with the standard map interface, it is required that standard versions of get(), put() and remove() for maps with primitive-type keys or values return null to denote missing keys rather than wrap the default return value in an object. In case both keys and values are reference types, the default return value must be returned instead, thus violating the standard map interface when the default return value is not null.

See Also:
Function

  • Method Summary

    Modifier and Type Method Description
    default <T> java.util.function.Function<K,​T> andThen​(java.util.function.Function<? super java.lang.Float,​? extends T> after)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default Reference2ByteFunction<K> andThenByte​(Float2ByteFunction after)  
    default Reference2CharFunction<K> andThenChar​(Float2CharFunction after)  
    default it.unimi.dsi.fastutil.objects.Reference2DoubleFunction<K> andThenDouble​(it.unimi.dsi.fastutil.floats.Float2DoubleFunction after)  
    default Reference2FloatFunction<K> andThenFloat​(it.unimi.dsi.fastutil.floats.Float2FloatFunction after)  
    default it.unimi.dsi.fastutil.objects.Reference2IntFunction<K> andThenInt​(it.unimi.dsi.fastutil.floats.Float2IntFunction after)  
    default it.unimi.dsi.fastutil.objects.Reference2LongFunction<K> andThenLong​(it.unimi.dsi.fastutil.floats.Float2LongFunction after)  
    default <T> it.unimi.dsi.fastutil.objects.Reference2ObjectFunction<K,​T> andThenObject​(it.unimi.dsi.fastutil.floats.Float2ObjectFunction<? extends T> after)  
    default <T> Reference2ReferenceFunction<K,​T> andThenReference​(Float2ReferenceFunction<? extends T> after)  
    default Reference2ShortFunction<K> andThenShort​(it.unimi.dsi.fastutil.floats.Float2ShortFunction after)  
    default double applyAsDouble​(K operand)
    default Byte2FloatFunction composeByte​(Byte2ReferenceFunction<K> before)  
    default Char2FloatFunction composeChar​(Char2ReferenceFunction<K> before)  
    default it.unimi.dsi.fastutil.doubles.Double2FloatFunction composeDouble​(it.unimi.dsi.fastutil.doubles.Double2ReferenceFunction<K> before)  
    default it.unimi.dsi.fastutil.floats.Float2FloatFunction composeFloat​(Float2ReferenceFunction<K> before)  
    default it.unimi.dsi.fastutil.ints.Int2FloatFunction composeInt​(it.unimi.dsi.fastutil.ints.Int2ReferenceFunction<K> before)  
    default it.unimi.dsi.fastutil.longs.Long2FloatFunction composeLong​(it.unimi.dsi.fastutil.longs.Long2ReferenceFunction<K> before)  
    default <T> it.unimi.dsi.fastutil.objects.Object2FloatFunction<T> composeObject​(it.unimi.dsi.fastutil.objects.Object2ReferenceFunction<? super T,​? extends K> before)  
    default <T> Reference2FloatFunction<T> composeReference​(Reference2ReferenceFunction<? super T,​? extends K> before)  
    default it.unimi.dsi.fastutil.shorts.Short2FloatFunction composeShort​(Short2ReferenceFunction<K> before)  
    default float defaultReturnValue()
    Gets the default return value.
    default void defaultReturnValue​(float rv)
    Sets the default return value (optional operation).
    default java.lang.Float get​(java.lang.Object key)
    Deprecated.
    Please use the corresponding type-specific method instead.
    float getFloat​(java.lang.Object key)
    Returns the value to which the given key is mapped.
    default float getOrDefault​(java.lang.Object key, float defaultValue)
    Returns the value associated by this function to the specified key, or give the specified value if not present.
    default java.lang.Float getOrDefault​(java.lang.Object key, java.lang.Float defaultValue)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default float put​(K key, float value)
    Adds a pair to the map (optional operation).
    default java.lang.Float put​(K key, java.lang.Float value)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default java.lang.Float remove​(java.lang.Object key)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default float removeFloat​(java.lang.Object key)
    Removes the mapping with the given key (optional operation).

    Methods inherited from interface it.unimi.dsi.fastutil.Function

    apply, clear, containsKey, size

    Methods inherited from interface java.util.function.Function

    compose

  • Method Details

    • applyAsDouble

      default double applyAsDouble​(K operand)
      Specified by:
      applyAsDouble in interface java.util.function.ToDoubleFunction<K>
      Since:
      8.0.0

    • put

      default float put​(K key, float value)
      Adds a pair to the map (optional operation).
      Parameters:
      key - the key.
      value - the value.
      Returns:
      the old value, or the default return value if no value was present for the given key.
      See Also:
      Function.put(Object,Object)

    • getFloat

      float getFloat​(java.lang.Object key)
      Returns the value to which the given key is mapped.
      Parameters:
      key - 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

      default float getOrDefault​(java.lang.Object key, float defaultValue)
      Returns the value associated by this function to the specified key, or give the specified value if not present.
      Parameters:
      key - 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.
      Since:
      8.5.0
      See Also:
      Function.getOrDefault(Object, Object)

    • removeFloat

      default float removeFloat​(java.lang.Object key)
      Removes the mapping with the given key (optional operation).
      Parameters:
      key - the key.
      Returns:
      the old value, or the default return value if no value was present for the given key.
      See Also:
      Function.remove(Object)

    • put

      @Deprecated default java.lang.Float put​(K key, java.lang.Float value)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      put in interface it.unimi.dsi.fastutil.Function<K,​java.lang.Float>

    • get

      @Deprecated default java.lang.Float get​(java.lang.Object key)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      get in interface it.unimi.dsi.fastutil.Function<K,​java.lang.Float>

    • getOrDefault

      @Deprecated default java.lang.Float getOrDefault​(java.lang.Object key, java.lang.Float defaultValue)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      getOrDefault in interface it.unimi.dsi.fastutil.Function<K,​java.lang.Float>

    • remove

      @Deprecated default java.lang.Float remove​(java.lang.Object key)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      remove in interface it.unimi.dsi.fastutil.Function<K,​java.lang.Float>

    • defaultReturnValue

      default void defaultReturnValue​(float rv)
      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.
      Parameters:
      rv - the new default return value.
      See Also:
      defaultReturnValue()

    • defaultReturnValue

      default float defaultReturnValue()
      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).

      Returns:
      the current default return value.

    • andThen

      @Deprecated default <T> java.util.function.Function<K,​T> andThen​(java.util.function.Function<? super java.lang.Float,​? extends T> after)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      andThen in interface java.util.function.Function<K,​java.lang.Float>

    • andThenByte

      default Reference2ByteFunction<K> andThenByte​(Float2ByteFunction after)

    • composeByte

      default Byte2FloatFunction composeByte​(Byte2ReferenceFunction<K> before)

    • andThenShort

      default Reference2ShortFunction<K> andThenShort​(it.unimi.dsi.fastutil.floats.Float2ShortFunction after)

    • composeShort

      default it.unimi.dsi.fastutil.shorts.Short2FloatFunction composeShort​(Short2ReferenceFunction<K> before)

    • andThenInt

      default it.unimi.dsi.fastutil.objects.Reference2IntFunction<K> andThenInt​(it.unimi.dsi.fastutil.floats.Float2IntFunction after)

    • composeInt

      default it.unimi.dsi.fastutil.ints.Int2FloatFunction composeInt​(it.unimi.dsi.fastutil.ints.Int2ReferenceFunction<K> before)

    • andThenLong

      default it.unimi.dsi.fastutil.objects.Reference2LongFunction<K> andThenLong​(it.unimi.dsi.fastutil.floats.Float2LongFunction after)

    • composeLong

      default it.unimi.dsi.fastutil.longs.Long2FloatFunction composeLong​(it.unimi.dsi.fastutil.longs.Long2ReferenceFunction<K> before)

    • andThenChar

      default Reference2CharFunction<K> andThenChar​(Float2CharFunction after)

    • composeChar

      default Char2FloatFunction composeChar​(Char2ReferenceFunction<K> before)

    • andThenFloat

      default Reference2FloatFunction<K> andThenFloat​(it.unimi.dsi.fastutil.floats.Float2FloatFunction after)

    • composeFloat

      default it.unimi.dsi.fastutil.floats.Float2FloatFunction composeFloat​(Float2ReferenceFunction<K> before)

    • andThenDouble

      default it.unimi.dsi.fastutil.objects.Reference2DoubleFunction<K> andThenDouble​(it.unimi.dsi.fastutil.floats.Float2DoubleFunction after)

    • composeDouble

      default it.unimi.dsi.fastutil.doubles.Double2FloatFunction composeDouble​(it.unimi.dsi.fastutil.doubles.Double2ReferenceFunction<K> before)

    • andThenObject

      default <T> it.unimi.dsi.fastutil.objects.Reference2ObjectFunction<K,​T> andThenObject​(it.unimi.dsi.fastutil.floats.Float2ObjectFunction<? extends T> after)

    • composeObject

      default <T> it.unimi.dsi.fastutil.objects.Object2FloatFunction<T> composeObject​(it.unimi.dsi.fastutil.objects.Object2ReferenceFunction<? super T,​? extends K> before)

    • andThenReference

      default <T> Reference2ReferenceFunction<K,​T> andThenReference​(Float2ReferenceFunction<? extends T> after)

    • composeReference

      default <T> Reference2FloatFunction<T> composeReference​(Reference2ReferenceFunction<? super T,​? extends K> before)