uk.co.strangeskies.expression

Class UnaryExpression<O,R>

java.lang.Object

uk.co.strangeskies.expression.PassiveExpression<R>

uk.co.strangeskies.expression.UnaryExpression<O,R>

Type Parameters:

O - The type of the operand.

R - The type of the result.

All Implemented Interfaces:

Expression<R>

Direct Known Subclasses:

Negation, NOT

public abstract class UnaryExpression<O,R>
extends PassiveExpression<R>

An implementation of Expression with a single data dependency, whose value is derived through the application of a function to the value of that dependency. This function may also be provided through an Expression dependency.

Constructor Summary

Constructors

Constructor and Description
UnaryExpression(Expression<? extends O> operand, java.util.function.Function<? super O,? extends R> operation)

Method Summary

Modifier and Type	Method and Description
protected R	evaluate()
Expression<? extends O>	getOperand()

Methods inherited from class uk.co.strangeskies.expression.PassiveExpression

getValue, invalidations

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.co.strangeskies.expression.Expression

anonymize, decoupleValue, immutable, over, over

Constructor Detail

UnaryExpression

public UnaryExpression(Expression<? extends O> operand,
                       java.util.function.Function<? super O,? extends R> operation)

Parameters:

operand - An expression providing an operand for the function.

operation - A function transforming an operand into a value of this expression's type.

Method Detail

getOperand

public Expression<? extends O> getOperand()

Returns:

The operand expression.

evaluate

protected R evaluate()

Specified by:

evaluate in class PassiveExpression<R>

Returns:

The value of this Expression as derived from the dependency Expressions.