org.matheclipse.core.reflection.system

Class EvenQ

java.lang.Object

org.matheclipse.core.eval.interfaces.AbstractCoreFunctionEvaluator

org.matheclipse.core.reflection.system.EvenQ

All Implemented Interfaces:

Predicate<IExpr>, ICoreFunctionEvaluator, IFunctionEvaluator, IEvaluator

public class EvenQ
extends AbstractCoreFunctionEvaluator
implements Predicate<IExpr>

Predicate function Returns True if the 1st argument is an even integer number; False otherwise

Field Summary

Fields

Modifier and Type	Field and Description
static EvenQ	CONST Constructor for the unary predicate

Constructor Summary

Constructors

Constructor and Description
EvenQ()

Method Summary

Modifier and Type	Method and Description
boolean	apply(IExpr expr) Returns the result of applying this predicate to input.
IExpr	evaluate(IAST ast) Symbolic evaluation of a function.
void	setUp(ISymbol symbol) Evaluate built-in rules and define Attributes for a function.

Methods inherited from class org.matheclipse.core.eval.interfaces.AbstractCoreFunctionEvaluator

numericEval

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.common.base.Predicate

equals

Field Detail

CONST

public static final EvenQ CONST

Constructor for the unary predicate

Constructor Detail

EvenQ

public EvenQ()

Method Detail

evaluate

public IExpr evaluate(IAST ast)

Description copied from class: AbstractCoreFunctionEvaluator

Symbolic evaluation of a function. ast.get(0) contains the head (i.e. the function symbol) of this abstract syntax tree (AST). ast.get(1) to ast.get(n) contains the first to n-th argument of the function.
If necessary use the methods from the Validate class to check the number or types of arguments in the evaluate method.
Note: if the symbolic evaluation isn't possible or no result is found the evaluate method returns with a null value without throwing an exception!

Specified by:

evaluate in interface IFunctionEvaluator

Specified by:

evaluate in class AbstractCoreFunctionEvaluator

Parameters:

ast - the abstract syntax tree (AST) which should be evaluated

Returns:

the evaluated object or null, if evaluation isn't possible

See Also:

Validate

setUp

public void setUp(ISymbol symbol)

Description copied from class: AbstractCoreFunctionEvaluator

Evaluate built-in rules and define Attributes for a function.

Specified by:

setUp in interface IEvaluator

Overrides:

setUp in class AbstractCoreFunctionEvaluator

Parameters:

symbol - the symbol which should be set up

apply

public boolean apply(IExpr expr)

Description copied from interface: Predicate

Returns the result of applying this predicate to input. This method is generally expected, but not absolutely required, to have the following properties:

• Its execution does not cause any observable side effects.
• The computation is consistent with equals; that is, Objects.equal(a, b) implies that predicate.apply(a) == predicate.apply(b)).

Specified by:

apply in interface Predicate<IExpr>