Package de.caff.generics.function

Function support.

See: Description

Interface Summary

Interface	Description
BooleanConsumer	A consumer for short values.
BooleanFunction1<T>	Function which has a primitive boolean as input, and an object as output.
BooleanFunction2<T>	Function which has two primitive booleans as input, and an object as output.
BooleanOperator0	Function with no argument and a boolean result.
BooleanOperator1	Unary operator with a boolean argument and result.
BooleanOperator2	Binary operator with two boolean arguments and a boolean result.
BooleanOperator3	Ternary operator with three boolean arguments and a boolean result.
BooleanPredicate1	Predicate which expects a primitive boolean argument.
BooleanPredicate2	Predicate which expects two primitive boolean arguments.
BooleanPredicate3	Predicate which expects three primitive boolean arguments.
BooleanSetter<T>	Procedure with a generic and a boolean argument.
ByteConsumer	A consumer for short values.
ByteFunction1<T>	Function which has a primitive byte as input, and an object as output.
ByteFunction2<T>	Function which has two primitive bytes as input, and an object as output.
ByteOperator0	Function with no argument and a byte result.
ByteOperator1	Unaray operator with a byte argument and result.
ByteOperator2	Binary operator with two byte arguments and a byte result.
ByteOperator3	Ternary operator with three byte arguments and a byte result.
BytePredicate1	Predicate which expects a primitive byte argument.
BytePredicate2	Predicate which expects two primitive byte arguments.
BytePredicate3	Predicate which expects three primitive byte arguments.
ByteSetter<T>	Procedure with a generic and a byte argument.
CharConsumer	A consumer for short values.
CharFunction1<T>	Function which has a primitive character as input, and an object as output.
CharFunction2<T>	Function which has two primitive characters as input, and an object as output.
CharOperator0	Function with no argument and a char result.
CharOperator1	Unary operator with a char argument and result.
CharOperator2	Binary operator with two char arguments and a char result.
CharOperator3	Ternary operator with three char arguments and a char result.
CharPredicate1	Predicate which expects a primitive char argument.
CharPredicate2	Predicate which expects two primitive char arguments.
CharPredicate3	Predicate which expects three primitive char arguments.
CharSetter<T>	Procedure with a generic and a char argument.
DoubleFunction2<T>	Function with 2 primitive double arguments creation a general result.
DoubleFunction3<T>	Function with 3 primitive double arguments creation a general result.
DoubleFunction4<T>	Function with 4 primitive double arguments creation a general result.
DoubleOperator0	Function with no argument and a double result.
DoubleOperator1	Unary operator with a double argument and result.
DoubleOperator2	Binary operator with two double arguments and a double result.
DoubleOperator3	Ternary operator with three double arguments and a double result.
DoublePredicate1	Predicate which expects a primitive double argument.
DoublePredicate2	Predicate which expects two primitive double arguments.
DoublePredicate3	Predicate which expects three primitive double arguments.
DoubleSetter<T>	Procedure with a generic and a double argument.
FloatConsumer	A consumer for short values.
FloatFunction1<T>	Function which has a primitive float as input, and an object as output.
FloatFunction2<T>	Function which has two primitive floats as input, and an object as output.
FloatOperator0	Function with no argument and a float result.
FloatOperator1	Unary operator with a float argument and result.
FloatOperator2	Binary operator with two float arguments and a float result.
FloatOperator3	Ternary operator with three float arguments and a float result.
FloatPredicate1	Predicate which expects a primitive float argument.
FloatPredicate2	Predicate which expects two primitive float arguments.
FloatPredicate3	Predicate which expects three primitive float arguments.
FloatSetter<T>	Procedure with a generic and a float argument.
FragileBooleanConsumer<E extends java.lang.Exception>	Boolean consumer which throws a checked exception.
FragileByteConsumer<E extends java.lang.Exception>	Byte consumer which throws a checked exception.
FragileCharConsumer<E extends java.lang.Exception>	Character consumer which throws a checked exception.
FragileDoubleConsumer<E extends java.lang.Exception>	Double consumer which throws a checked exception.
FragileFloatConsumer<E extends java.lang.Exception>	Float consumer which throws a checked exception.
FragileFunction0<R,E extends java.lang.Exception>	Function with no parameter which can throw an exception.
FragileFunction1<R,E extends java.lang.Exception,P>	Function with one parameter, possibly throwing an exception.
FragileFunction2<R,E extends java.lang.Exception,P1,P2>	Function with two parameters, possibly throwing an exception.
FragileFunction3<R,E extends java.lang.Exception,P1,P2,P3>	Function with three parameters, possibly throwing a checked exception.
FragileFunction4<R,E extends java.lang.Exception,P1,P2,P3,P4>	Function with four parameters, possibly throwing a checked exception.
FragileIntConsumer<E extends java.lang.Exception>	Int consumer which throws a checked exception.
FragileLongConsumer<E extends java.lang.Exception>	Long consumer which throws a checked exception.
FragileProcedure0<E extends java.lang.Exception>	Function without return and with no paramete, but a possible expectionr.
FragileProcedure1<E extends java.lang.Exception,P>	Function without return and with one parameter.
FragileProcedure2<E extends java.lang.Exception,P1,P2>	Function without return and with two parameters.
FragileProcedure3<E extends java.lang.Exception,P1,P2,P3>	Function without return and with three parameters.
FragileProcedure4<E extends java.lang.Exception,P1,P2,P3,P4>	Function without return and with four parameters.
FragileShortConsumer<E extends java.lang.Exception>	Short consumer which throws a checked exception.
Function0<R>	Function with no parameter.
Function1<R,P>	Function with one parameter.
Function2<R,P1,P2>	Function with two parameters.
Function3<R,P1,P2,P3>	Function with three parameters.
Function4<R,P1,P2,P3,P4>	Function with four parameters.
Function5<R,P1,P2,P3,P4,P5>	Function with five parameters.
Function6<R,P1,P2,P3,P4,P5,P6>	Function with six parameters.
Function7<R,P1,P2,P3,P4,P5,P6,P7>	Function with seven parameters.
Function8<R,P1,P2,P3,P4,P5,P6,P7,P8>	Function with eight parameters.
Function9<R,P1,P2,P3,P4,P5,P6,P7,P8,P9>	Function with nine parameters.
IntFunction2<T>	Function with two integer arguments and generic result.
IntFunction3<T>	Function with three integer arguments and generic result.
IntOperator0	Function with no argument and an int result.
IntOperator1	Unary operator with a int argument and result.
IntOperator2	Binary operator with two int arguments and a int result.
IntOperator3	Ternary operator with three int arguments and a int result.
IntPredicate1	Predicate which expects a primitive integer argument.
IntPredicate2	Predicate which expects two primitive integer arguments.
IntPredicate3	Predicate which expects three primitive integer arguments.
IntSetter<T>	Procedure with a generic and a int argument.
IntToByteFunction1	Function with one primitive integer argument and a primitive byte return.
IntToByteFunction2	Function with two primitive integer arguments and a primitive byte result.
IntToByteFunction3	Function with three primitive integer arguments and a primitive byte result.
IntToCharFunction1	Function with one primitive integer argument and a primitive char return.
IntToCharFunction2	Function with two primitive integer arguments and a primitive byte result.
IntToCharFunction3	Function with three primitive integer arguments and a primitive char result.
IntToDoubleFunction2	Function with two primitive integer arguments and a primitive double result.
IntToDoubleFunction3	Function with three primitive integer arguments and a primitive double result.
IntToFloatFunction1	Function with one primitive integer argument and a primitive flaat return.
IntToFloatFunction2	Function with two primitive integer arguments and a primitive float result.
IntToFloatFunction3	Function with three primitive integer arguments and a primitive float result.
IntToIntFunction3	Function with three primitive integer arguments and a primitive integer result.
IntToLongFunction2	Function with two primitive integer arguments and a primitive long result.
IntToLongFunction3	Function with three primitive integer arguments and a primitive long result.
IntToShortFunction1	Function with one primitive integer argument and a primitive short return.
IntToShortFunction2	Function with two primitive integer arguments and a primitive short result.
IntToShortFunction3	Function with three primitive integer arguments and a primitive short result.
LongFunction2<T>	Function which has two primitive longs as input, and an object as output.
LongOperator0	Function with no argument and a long result.
LongOperator1	Unary operator with a long argument and result.
LongOperator2	Binary operator with two long arguments and a long result.
LongOperator3	Function with three long arguments and a long result.
LongPredicate1	Predicate which expects a primitive long argument.
LongPredicate2	Predicate which expects two primitive long arguments.
LongPredicate3	Predicate which expects three primitive long arguments.
LongSetter<T>	Procedure with a generic and a long argument.
Predicate1<P>	A function with one argument which returns a boolean value.
Predicate2<P1,P2>	A function with two arguments which returns a boolean value.
Predicate3<P1,P2,P3>	A function with three arguments which returns a boolean value.
Predicate4<P1,P2,P3,P4>	A function with four arguments which returns a boolean value.
Predicate5<P1,P2,P3,P4,P5>	A function with five arguments which returns a boolean value.
Predicate6<P1,P2,P3,P4,P5,P6>	A function with six arguments which returns a boolean value.
Predicate7<P1,P2,P3,P4,P5,P6,P7>	A function with seven arguments which returns a boolean value.
Predicate8<P1,P2,P3,P4,P5,P6,P7,P8>	A function with eight arguments which returns a boolean value.
Predicate9<P1,P2,P3,P4,P5,P6,P7,P8,P9>	A function with nine arguments which returns a boolean value.
Procedure0	Function without return and with no parameter.
Procedure1<P>	Function without return and with one parameter.
Procedure2<P1,P2>	Function without return and with two parameters.
Procedure3<P1,P2,P3>	Function without return and with three parameters.
Procedure4<P1,P2,P3,P4>	Function without return and with four parameters.
Procedure5<P1,P2,P3,P4,P5>	Function without return and with five parameters.
Procedure6<P1,P2,P3,P4,P5,P6>	Function without return and with six parameters.
Procedure7<P1,P2,P3,P4,P5,P6,P7>	Function without return and with seven parameters.
Procedure8<P1,P2,P3,P4,P5,P6,P7,P8>	Function without return and with eight parameters.
Procedure9<P1,P2,P3,P4,P5,P6,P7,P8,P9>	Function without return and with nine parameters.
ShortConsumer	A consumer for short values.
ShortFunction1<T>	Function which has a primitive short as input, and an object as output.
ShortFunction2<T>	Function which has two primitive shorts as input, and an object as output.
ShortOperator0	Function with no argument and a short result.
ShortOperator1	Unary operator with a short argument and result.
ShortOperator2	Binary operator with two short arguments and a short result.
ShortOperator3	Ternary operator with three short arguments and a short result.
ShortPredicate1	Predicate which expects a primitive short argument.
ShortPredicate2	Predicate which expects two primitive short arguments.
ShortPredicate3	Predicate which expects three primitive short arguments.
ShortSetter<T>	Procedure with a generic and a short argument.
ToByteFunction<T>	A function which produces a byte value from a generic value.
ToCharFunction<T>	A function which produces a char value from a generic value.
ToFloatFunction<T>	A function which produces a float value from a generic value.
ToShortFunction<T>	A function which produces a short value from a generic value.
VarBooleanOperator	Primitive boolean operator with a variable number of arguments.
VarByteOperator	Primitive byte operator with a variable number of arguments.
VarCharOperator	Primitive char operator with a variable number of arguments.
VarDoubleOperator	Primitive double operator with a variable number of arguments.
VarFloatOperator	Primitive float operator with a variable number of arguments.
VarIntOperator	Primitive integer operator with a variable number of arguments.
VarLongOperator	Primitive long operator with a variable number of arguments.
VarShortOperator	Primitive short operator with a variable number of arguments.

Class Summary

Class	Description
Predicates	Helper for predicates.

Exception Summary

Exception	Description
EvaluationException	Helper exception for wrapping a checked exception.

Package de.caff.generics.function Description

Function support.

General

• Interfaces with more than one argument provide default methods for partial evaluation.
• Generic functions, procedures (consumers) and predicates with more than one argument are also defined as 1-argument equivalents which accept a tuple. The tuple is expanded into the expected arguments in order one-by-one. So the tuple's size has to match the number of parameters, and the tuple's types have to match the parameter types.

Simple Functions

Functions here take up to 9 arguments, and return one result. For historical reasons (this lib started earlier) the order of type arguments is different from standard Java Function and BiFunction. While Java orders the types like lambda arguments (<P1, P2, R>):

  (P1 arg1, P2 arg2) -> R
 

this lib follows the order in function definitions (<R, P1, P2>}:

  R function(P1 arg1, P2 arg2)  
 

Some of the functions are available in standard Java, and implementations here extend the standard interfaces nowadays, but usually come with a bit of benefit. But especially they allow more than 2 arguments.

Functions with 2 or more arguments can be chained after any function returning a tuple of the correct size and matching elements. See eg Function2.after3(de.caff.generics.function.Function3). Having the analogue to Function2.andThen(java.util.function.Function) is not possible due to the restrictions of the Java generic type system.

• Function0: function without argumen like java.util.function.Supplier.
• Function1: function with one argument like java.util.function.Function.
• Function2: function with two arguments like java.util.function.BiFunction.
• Function3: function with three arguments.
• Function4: function with four arguments.
• Function5: function with five arguments.
• Function6: function with six arguments.
• Function7: function with seven arguments.
• Function8: function with eight arguments.
• Function9: function with nine arguments.

Procedures

Procedures are functions with no return values, so they are quite similar to functions:

As functions they can be chain after functions which return tuples of the correct size.

• Procedure0: procedure without argument.
• Procedure1: procedure with one argument.
• Procedure2: procedure with two arguments.
• Procedure3: procedure with three arguments.
• Procedure4: procedure with four arguments.
• Procedure5: procedure with five arguments.
• Procedure6: procedure with six arguments.
• Procedure7: procedure with seven arguments.
• Procedure8: procedure with eight arguments.
• Procedure9: procedure with nine arguments.

Predicates

Predicates are just functions which return a boolean. Basically a function returning a java.lang.Boolean is quite the same, but for one thing the predicates avoid boxing/unboxing, and come with special methods allowing easy boolean combination.

As functions they can be chain after functions which return tuples of the correct size.

• Predicate1: predicate with one argument.
• Predicate2: predicate with one arguments.
• Predicate3: predicate with three arguments.
• Predicate4: predicate with four arguments.
• Predicate5: predicate with five arguments.
• Predicate6: predicate with six arguments.
• Predicate7: predicate with seven arguments.
• Predicate8: predicate with eight arguments.
• Predicate9: predicate with nine arguments.

Fragile functions

Fragile functions are like standard functions, but can throw exceptions. This concept is a bit fragile itself, so not supported as well as the above.

• FragileFunction0: fragile function without arguments.
• FragileFunction1: fragile function with one arguments.

Operators, Functions and Consumers for Primitive Types

Some of these are lacking in the standard lib, although they are useful to avoid unnecessary boxing/unboxing.

Primitive types are divided in

• Consumers: 1-argument procedure accepting the type, standard Java has thes only for int, long, and double.
• Functions: these accept 2 to 3 arguments of the given type, and return a non-primitive type. The 1-argument case is often already contained in the standard Java library, if not it is also provided here.
• Operators: these are functions which accept 0 to 3 arguments of the given type and return the same type.
• Predicates: these are functions which accept 1 or 2 arguments of the given type and return a boolean.

Interface	boolean	byte	char	double	float	int	long	short
Consumer	BooleanConsumer	ByteConsumer	CharConsumer	java.util.function.DoubleConsumer	BooleanConsumer	java.util.function.IntConsumer	java.util.function.LongConsumer	ShortConsumer
Supplier (0-argument Operator)	BooleanOperator0	ByteOperator0	CharOperator0	java.util.function.DoubleSupplier	FloatOperator0	java.util.function.IntSupplier	java.util.function.LongSupplier	ShortOperator0
Unary (1-argument) Operator	BooleanOperator1	ByteOperator1	CharOperator1	java.util.function.DoubleUnaryOperator	FloatOperator1	java.util.function.IntUnaryOperator	java.util.function.LongUnaryOperator	ShortOperator1
Binary (2-argument) Operator	BooleanOperator2	ByteOperator2	CharOperator2	java.util.function.DoubleBinaryOperator	FloatOperator2	java.util.function.IntBinaryOperator	java.util.function.LongBinaryOperator	ShortOperator2
Ternary (3-argument) Operator	BooleanOperator3	ByteOperator3	CharOperator3	DoubleOperator3	FloatOperator3	IntOperator3	LongOperator3	ShortOperator3
Variable Arguments Operator	VarBooleanOperator	VarByteOperator	VarCharOperator	VarDoubleOperator	VarFloatOperator	VarIntOperator	VarLongOperator	VarShortOperator
1-argument Predicate	BooleanPredicate1	BytePredicate1	CharPredicate1	CharPredicate1	CharPredicate1	CharPredicate1	CharPredicate1	CharPredicate1
2-argument Predicate	BooleanPredicate2	BytePredicate2	CharPredicate2	CharPredicate2	CharPredicate2	CharPredicate2	CharPredicate2	CharPredicate2
3-argument Predicate	BooleanPredicate3	BytePredicate3	CharPredicate3	CharPredicate3	CharPredicate3	CharPredicate3	CharPredicate3	CharPredicate3