@FunctionalInterface public interface Long2ObjectFunction<V> extends Function<java.lang.Long,V>, java.util.function.LongFunction<V>
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
.
Function
Modifier and Type | Method and Description |
---|---|
default Long2ByteFunction |
andThenByte(Object2ByteFunction<V> after) |
default Long2CharFunction |
andThenChar(Object2CharFunction<V> after) |
default Long2DoubleFunction |
andThenDouble(Object2DoubleFunction<V> after) |
default Long2FloatFunction |
andThenFloat(Object2FloatFunction<V> after) |
default Long2IntFunction |
andThenInt(Object2IntFunction<V> after) |
default Long2LongFunction |
andThenLong(Object2LongFunction<V> after) |
default <T> Long2ObjectFunction<T> |
andThenObject(Object2ObjectFunction<? super V,? extends T> after) |
default <T> Long2ReferenceFunction<T> |
andThenReference(Object2ReferenceFunction<? super V,? extends T> after) |
default Long2ShortFunction |
andThenShort(Object2ShortFunction<V> after) |
default V |
apply(long operand) |
default <T> java.util.function.Function<T,V> |
compose(java.util.function.Function<? super T,? extends java.lang.Long> before)
Deprecated.
Please use the corresponding type-specific method instead.
|
default Byte2ObjectFunction<V> |
composeByte(Byte2LongFunction before) |
default Char2ObjectFunction<V> |
composeChar(Char2LongFunction before) |
default Double2ObjectFunction<V> |
composeDouble(Double2LongFunction before) |
default Float2ObjectFunction<V> |
composeFloat(Float2LongFunction before) |
default Int2ObjectFunction<V> |
composeInt(Int2LongFunction before) |
default Long2ObjectFunction<V> |
composeLong(Long2LongFunction before) |
default <T> Object2ObjectFunction<T,V> |
composeObject(Object2LongFunction<? super T> before) |
default <T> Reference2ObjectFunction<T,V> |
composeReference(Reference2LongFunction<? super T> before) |
default Short2ObjectFunction<V> |
composeShort(Short2LongFunction before) |
default boolean |
containsKey(long key)
Returns true if this function contains a mapping for the specified key.
|
default boolean |
containsKey(java.lang.Object key)
Deprecated.
Please use the corresponding type-specific method instead.
|
default V |
defaultReturnValue()
Gets the default return value.
|
default void |
defaultReturnValue(V rv)
Sets the default return value (optional operation).
|
V |
get(long key)
Returns the value to which the given key is mapped.
|
default V |
get(java.lang.Object key)
Deprecated.
Please use the corresponding type-specific method instead.
|
default V |
getOrDefault(long key,
V defaultValue)
Returns the value associated by this function to the specified key, or give the specified
value if not present.
|
default V |
getOrDefault(java.lang.Object key,
V defaultValue)
Deprecated.
Please use the corresponding type-specific method instead.
|
default V |
put(long key,
V value)
Adds a pair to the map (optional operation).
|
default V |
put(java.lang.Long key,
V value)
Deprecated.
Please use the corresponding type-specific method instead.
|
default V |
remove(long key)
Removes the mapping with the given key (optional operation).
|
default V |
remove(java.lang.Object key)
Deprecated.
Please use the corresponding type-specific method instead.
|
default V apply(long operand)
apply
in interface java.util.function.LongFunction<V>
default V put(long key, V value)
key
- the key.value
- the value.Function.put(Object,Object)
V get(long key)
key
- the key.Function.get(Object)
default V getOrDefault(long key, V defaultValue)
key
- the key.defaultValue
- the value to return if not present.defaultValue
if no value was present for the given key.Function.getOrDefault(Object, Object)
default V remove(long key)
key
- the key.Function.remove(Object)
@Deprecated default V put(java.lang.Long key, V value)
key
- the key.value
- the value.null
if no value was present for the given key.Map.put(Object,Object)
@Deprecated default V get(java.lang.Object key)
key
- the key.null
if no value was present for the given key.Map.get(Object)
@Deprecated default V getOrDefault(java.lang.Object key, V defaultValue)
key
- the key.defaultValue
- the default value to return if not present.defaultValue
if no value was present for the
given key.Map.getOrDefault(Object, Object)
@Deprecated default V remove(java.lang.Object key)
key
- the key.null
if no value was present for the given key.Map.remove(Object)
default boolean containsKey(long key)
Note that for some kind of functions (e.g., hashes) this method will always return true. In particular, this default implementation always returns true.
key
- the key.key
.Function.containsKey(Object)
@Deprecated default boolean containsKey(java.lang.Object 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.
key
- the key.key
.Map.containsKey(Object)
default void defaultReturnValue(V rv)
get()
, put()
and remove()
to
denote that the map does not contain the specified key. It must be
0/false
/null
by default.rv
- the new default return value.defaultReturnValue()
default V defaultReturnValue()
This default implementation just return the default null value
of the type (null
for objects, 0 for scalars, false for Booleans).
@Deprecated default <T> java.util.function.Function<T,V> compose(java.util.function.Function<? super T,? extends java.lang.Long> before)
compose
in interface java.util.function.Function<java.lang.Long,V>
default Long2ByteFunction andThenByte(Object2ByteFunction<V> after)
default Byte2ObjectFunction<V> composeByte(Byte2LongFunction before)
default Long2ShortFunction andThenShort(Object2ShortFunction<V> after)
default Short2ObjectFunction<V> composeShort(Short2LongFunction before)
default Long2IntFunction andThenInt(Object2IntFunction<V> after)
default Int2ObjectFunction<V> composeInt(Int2LongFunction before)
default Long2LongFunction andThenLong(Object2LongFunction<V> after)
default Long2ObjectFunction<V> composeLong(Long2LongFunction before)
default Long2CharFunction andThenChar(Object2CharFunction<V> after)
default Char2ObjectFunction<V> composeChar(Char2LongFunction before)
default Long2FloatFunction andThenFloat(Object2FloatFunction<V> after)
default Float2ObjectFunction<V> composeFloat(Float2LongFunction before)
default Long2DoubleFunction andThenDouble(Object2DoubleFunction<V> after)
default Double2ObjectFunction<V> composeDouble(Double2LongFunction before)
default <T> Long2ObjectFunction<T> andThenObject(Object2ObjectFunction<? super V,? extends T> after)
default <T> Object2ObjectFunction<T,V> composeObject(Object2LongFunction<? super T> before)
default <T> Long2ReferenceFunction<T> andThenReference(Object2ReferenceFunction<? super V,? extends T> after)
default <T> Reference2ObjectFunction<T,V> composeReference(Reference2LongFunction<? super T> before)