org.specrunner.expressions.core
Class AbstractExpression

java.lang.Object
  org.specrunner.expressions.core.AbstractExpression

All Implemented Interfaces:

IExpression

Direct Known Subclasses:

ExpressionJanino, ExpressionVariable

public abstract class AbstractExpression
extends Object
implements IExpression

The expression factory.

Author:

Thiago Santos

Field Summary

static IExpressionItem[]

DEFAULT_PRECEDENCE The default precedence order.

Fields inherited from interface org.specrunner.expressions.IExpression

FEATURE_PRECEDENCE

Constructor Summary

protected

AbstractExpression(IExpressionFactory parent) Basic constructor.

Method Summary

Object	evaluate(IContext context) Given a context, evaluates an expression silently.
IExpressionFactory	getParent() The mother factory.
IExpressionItem[]	getPrecedence() Get evaluation precedence order.
void	setPrecedence(IExpressionItem[] precedence) Set evaluation precedence order.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.specrunner.expressions.IExpression

evaluate

Field Detail

DEFAULT_PRECEDENCE

public static final IExpressionItem[] DEFAULT_PRECEDENCE

The default precedence order.

Constructor Detail

AbstractExpression

protected AbstractExpression(IExpressionFactory parent)

Basic constructor.

Parameters:

parent - The parent.

Method Detail

getParent

public IExpressionFactory getParent()

Description copied from interface: IExpression

The mother factory.

Specified by:

getParent in interface IExpression

Returns:

The factory where the expression came from.

getPrecedence

public IExpressionItem[] getPrecedence()

Description copied from interface: IExpression

Get evaluation precedence order.

Specified by:

getPrecedence in interface IExpression

Returns:

The current precedence.

setPrecedence

public void setPrecedence(IExpressionItem[] precedence)

Description copied from interface: IExpression

Set evaluation precedence order.

Specified by:

setPrecedence in interface IExpression

Parameters:

precedence - The precedence.

evaluate

public Object evaluate(IContext context)
                throws ExpressionException

Description copied from interface: IExpression

Given a context, evaluates an expression silently.

Specified by:

evaluate in interface IExpression

Parameters:

context - A contextual information.

Returns:

The result of expression evaluation.

Throws:

ExpressionException - On evaluation errors.