Package com.singularsys.jep.functions

Class BinaryFunction

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.BinaryFunction

All Implemented Interfaces:

PostfixMathCommandI, Serializable

Direct Known Subclasses:

ArcTangent2, BigDecRoundSigFig, Binomial, BitAnd, BitOr, BitXor, Comparative, ComplexPFMC, Cross, Divide, Dot, JepTest.MyBinary, Left, Logical, LogTwoArg, LShift, Modulus, NullWrappedBinary, Polar, Power, Remainder, Right, RShift, Subtract, URShift

public abstract class BinaryFunction
extends PostfixMathCommand

Convenient base class for binary functions. Defines an Object eval(Object l,Object r) method for calculating the result.

Author:

Richard Morris

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
BinaryFunction()

Method Summary

Modifier and Type	Method	Description
abstract Object	eval(Object l, Object r)
static <T> BinaryFunction	instanceOf(Class<T> type, BiFunction<T,T,? super Object> fun)	Create a BinaryFunction from a lambda expression where both arguments are of a specified type.
static BinaryFunction	instanceOf(BiFunction<Object,Object,? super Object> fun)	Create a BinaryFunction from a lambda expression where arguments can be Objects.
final void	run(Stack<Object> stack)	Calls eval(Object, Object)

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Details

BinaryFunction

public BinaryFunction()

Method Details

run

public final void run(Stack<Object> stack)
               throws EvaluationException

Calls eval(Object, Object)

Specified by:

run in interface PostfixMathCommandI

Overrides:

run in class PostfixMathCommand

Parameters:

stack - arguments for function

Throws:

EvaluationException - if function cannot be evaluated

eval

public abstract Object eval(Object l,
 Object r)
                     throws EvaluationException

Throws:

EvaluationException

instanceOf

public static BinaryFunction instanceOf(BiFunction<Object,Object,? super Object> fun)

Create a BinaryFunction from a lambda expression where arguments can be Objects. For example BinaryFunction.instanceOf((x,y) -> ((Number) x).doubleValue() + ((Number) y).doubleValue())

Parameters:

fun - the lambda function

Returns:

a new BinaryFunction instance

Since:

Jep 4.0

instanceOf

public static <T> BinaryFunction instanceOf(Class<T> type,
 BiFunction<T,T,? super Object> fun)

Create a BinaryFunction from a lambda expression where both arguments are of a specified type. For example BinaryFunction.instanceOf(Integer.class, (x,y) -> x * y) The eval(Object,Object) method will throw an IllegalParameterException if either argument is not of the correct type.

Type Parameters:

T - type of arguments and return value

Parameters:

type - type of the arguments

fun - the lambda function

Returns:

a new BinaryFunction instance

Since:

Jep 4.0