hera.api.function

Class Functions

java.lang.Object

hera.api.function.Functions

public final class Functions
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.lang.Class<?>[]	functions

Constructor Summary

Constructors

Constructor and Description
Functions()

Method Summary

Modifier and Type	Method and Description
static <R> Function0<R>	buildInvocation(Function<R> f, java.util.List<java.lang.Object> args) Make invocation with f and args.
static <R,V> Function0<V>	compose(Function0<R> first, Function1<? super R,? extends V> second) Returns a composed function that first applies first function to its input, and then applies the second function to the result.
static <T,R,V> Function1<T,V>	compose(Function1<? super T,? extends R> first, Function1<? super R,? extends V> second) Returns a composed function that first applies first function to its input, and then applies the second function to the result.
static <T1,T2,R,V> Function2<T1,T2,V>	compose(Function2<? super T1,? super T2,? extends R> first, Function1<? super R,? extends V> second) Returns a composed function that first applies first function to its input, and then applies the second function to the result.
static <T1,T2,T3,R,V> Function3<T1,T2,T3,V>	compose(Function3<? super T1,? super T2,? super T3,? extends R> first, Function1<? super R,? extends V> second) Returns a composed function that first applies first function to its input, and then applies the second function to the result.
static <T1,T2,T3,T4,R,V> Function4<T1,T2,T3,T4,V>	compose(Function4<? super T1,? super T2,? super T3,? super T4,? extends R> first, Function1<? super R,? extends V> second) Returns a composed function that first applies first function to its input, and then applies the second function to the result.
static <T1,T2,T3,T4,T5,R,V> Function5<T1,T2,T3,T4,T5,V>	compose(Function5<? super T1,? super T2,? super T3,? super T4,? super T5,? extends R> first, Function1<? super R,? extends V> second) Returns a composed function that first applies first function to its input, and then applies the second function to the result.
static <R> Function0<R>	identify(Function0<R> f, java.lang.String identity) Identify a function by name.
static <T,R> Function1<T,R>	identify(Function1<T,R> f, java.lang.String identity) Identify a function by name.
static <T1,T2,R> Function2<T1,T2,R>	identify(Function2<T1,T2,R> f, java.lang.String identity) Identify a function by name.
static <T1,T2,T3,R> Function3<T1,T2,T3,R>	identify(Function3<T1,T2,T3,R> f, java.lang.String identity) Identify a function by name.
static <T1,T2,T3,T4,R> Function4<T1,T2,T3,T4,R>	identify(Function4<T1,T2,T3,T4,R> f, java.lang.String identity) Identify a function by name.
static <T1,T2,T3,T4,T5,R> Function5<T1,T2,T3,T4,T5,R>	identify(Function5<T1,T2,T3,T4,T5,R> f, java.lang.String identity) Identify a function by name.
static <R> R	invoke(Function<R> f, java.util.List<java.lang.Object> args) Invoke target f with args and return result.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

functions

protected static final java.lang.Class<?>[] functions

Constructor Detail

Functions

public Functions()

Method Detail

invoke

public static <R> R invoke(Function<R> f,
                           java.util.List<java.lang.Object> args)

Invoke target f with args and return result.

Type Parameters:

R - an invocation return type

Parameters:

f - a function to invoke

args - arguments to pass

Returns:

invocation result

buildInvocation

public static <R> Function0<R> buildInvocation(Function<R> f,
                                               java.util.List<java.lang.Object> args)

Make invocation with f and args.

Type Parameters:

R - an invocation return type

Parameters:

f - a function to invoke

args - arguments to pass

Returns:

invocation object

identify

public static <R> Function0<R> identify(Function0<R> f,
                                        java.lang.String identity)

Identify a function by name.

Type Parameters:

R - a function return type

Parameters:

f - a function to identify

identity - an identity

Returns:

a function with identity

identify

public static <T,R> Function1<T,R> identify(Function1<T,R> f,
                                            java.lang.String identity)

Identify a function by name.

Type Parameters:

T - a function argument type

R - a function return type

Parameters:

f - a function to identify

identity - an identity

Returns:

a function with identity

identify

public static <T1,T2,R> Function2<T1,T2,R> identify(Function2<T1,T2,R> f,
                                                    java.lang.String identity)

Identify a function by name.

Type Parameters:

T1 - a function 1st argument type

T2 - a function 2nd argument type

R - a function return type

Parameters:

f - a function to identify

identity - an identity

Returns:

a function with identity

identify

public static <T1,T2,T3,R> Function3<T1,T2,T3,R> identify(Function3<T1,T2,T3,R> f,
                                                          java.lang.String identity)

Identify a function by name.

Type Parameters:

T1 - a function 1st argument type

T2 - a function 2nd argument type

T3 - a function 3rd argument type

R - a function return type

Parameters:

f - a function to identify

identity - an identity

Returns:

a function with identity

identify

public static <T1,T2,T3,T4,R> Function4<T1,T2,T3,T4,R> identify(Function4<T1,T2,T3,T4,R> f,
                                                                java.lang.String identity)

Identify a function by name.

Type Parameters:

T1 - a function 1st argument type

T2 - a function 2nd argument type

T3 - a function 3rd argument type

T4 - a function 4th argument type

R - a function return type

Parameters:

f - a function to identify

identity - an identity

Returns:

a function with identity

identify

public static <T1,T2,T3,T4,T5,R> Function5<T1,T2,T3,T4,T5,R> identify(Function5<T1,T2,T3,T4,T5,R> f,
                                                                      java.lang.String identity)

Identify a function by name.

Type Parameters:

T1 - a function 1st argument type

T2 - a function 2nd argument type

T3 - a function 3rd argument type

T4 - a function 4th argument type

T5 - a function 5th argument type

R - a function return type

Parameters:

f - a function to identify

identity - an identity

Returns:

a function with identity

compose

public static <R,V> Function0<V> compose(Function0<R> first,
                                         Function1<? super R,? extends V> second)

Returns a composed function that first applies first function to its input, and then applies the second function to the result.

Type Parameters:

R - the output type of first and the input type of second

V - the type of output of the second function

Parameters:

first - the function to invoke first

second - the function to invoke second

Returns:

a composed function that first applies first function and then applies the second function

Throws:

java.lang.NullPointerException - if before or after is null

compose

public static <T,R,V> Function1<T,V> compose(Function1<? super T,? extends R> first,
                                             Function1<? super R,? extends V> second)

Returns a composed function that first applies first function to its input, and then applies the second function to the result.

Type Parameters:

T - the input type of first

R - the output type of first and the input type of second

V - the type of output of the second function

Parameters:

first - the function to invoke first

second - the function to invoke second

Returns:

a composed function that first applies first function and then applies the second function

Throws:

java.lang.NullPointerException - if before or after is null

compose

public static <T1,T2,R,V> Function2<T1,T2,V> compose(Function2<? super T1,? super T2,? extends R> first,
                                                     Function1<? super R,? extends V> second)

Returns a composed function that first applies first function to its input, and then applies the second function to the result.

Type Parameters:

T1 - the 1st input type of first

T2 - the 2nd input type of first

R - the output type of first and the input type of second

V - the type of output of the second function

Parameters:

first - the function to invoke first

second - the function to invoke second

Returns:

a composed function that first applies first function and then applies the second function

Throws:

java.lang.NullPointerException - if before or after is null

compose

public static <T1,T2,T3,R,V> Function3<T1,T2,T3,V> compose(Function3<? super T1,? super T2,? super T3,? extends R> first,
                                                           Function1<? super R,? extends V> second)

Returns a composed function that first applies first function to its input, and then applies the second function to the result.

Type Parameters:

T1 - the 1st input type of first

T2 - the 2nd input type of first

T3 - the 3rd input type of first

R - the output type of first and the input type of second

V - the type of output of the second function

Parameters:

first - the function to invoke first

second - the function to invoke second

Returns:

a composed function that first applies first function and then applies the second function

Throws:

java.lang.NullPointerException - if before or after is null

compose

public static <T1,T2,T3,T4,R,V> Function4<T1,T2,T3,T4,V> compose(Function4<? super T1,? super T2,? super T3,? super T4,? extends R> first,
                                                                 Function1<? super R,? extends V> second)

Returns a composed function that first applies first function to its input, and then applies the second function to the result.

Type Parameters:

T1 - the 1st input type of first

T2 - the 2nd input type of first

T3 - the 3rd input type of first

T4 - the 3rd input type of first

R - the output type of first and the input type of second

V - the type of output of the second function

Parameters:

first - the function to invoke first

second - the function to invoke second

Returns:

a composed function that first applies first function and then applies the second function

Throws:

java.lang.NullPointerException - if before or after is null

compose

public static <T1,T2,T3,T4,T5,R,V> Function5<T1,T2,T3,T4,T5,V> compose(Function5<? super T1,? super T2,? super T3,? super T4,? super T5,? extends R> first,
                                                                       Function1<? super R,? extends V> second)

Returns a composed function that first applies first function to its input, and then applies the second function to the result.

Type Parameters:

T1 - the 1st input type of first

T2 - the 2nd input type of first

T3 - the 3rd input type of first

T4 - the 3rd input type of first

T5 - the 4th input type of first

R - the output type of first and the input type of second

V - the type of output of the second function

Parameters:

first - the function to invoke first

second - the function to invoke second

Returns:

a composed function that first applies first function and then applies the second function

Throws:

java.lang.NullPointerException - if before or after is null