com.aragost.araspect.evaluators
Class FieldEvaluator

java.lang.Object
  |
  +--com.aragost.araspect.evaluators.Evaluator
        |
        +--com.aragost.araspect.evaluators.FieldEvaluator

All Implemented Interfaces:

Updater

public class FieldEvaluator

extends Evaluator

implements Updater

Constructor Summary

FieldEvaluator()

Method Summary

PathElement	createPathElement(java.lang.String className, java.lang.String fieldName)
java.lang.Object	eval(java.lang.Object arg, PathElement elm) Evaluate a PathElement for the specified Object.
java.lang.String	id() Return a unique id for the receiver.
java.lang.String	prettyPrint(PathElement elm) Prettyprint the specified PathElement.
void	update(java.lang.Object object, PathElement elm, java.lang.String newValue) Update a attribute of an object from user input.

Methods inherited from class com.aragost.araspect.evaluators.Evaluator

get, getRegisteredEvaluators, register, register

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldEvaluator

public FieldEvaluator()

Method Detail

createPathElement

public PathElement createPathElement(java.lang.String className,
                                     java.lang.String fieldName)

id

public java.lang.String id()

Description copied from class: Evaluator

Return a unique id for the receiver. Only one Evaluator should return the same id.

Specified by:

id in class Evaluator

Returns:

String the id.

See Also:

Evaluator.id()

eval

public java.lang.Object eval(java.lang.Object arg,
                             PathElement elm)
                      throws EvaluationException

Description copied from class: Evaluator

Evaluate a PathElement for the specified Object. The receiver is assumed to be the Evaluator specified by the evaluatorId() of the PathElement.

Specified by:

eval in class Evaluator

Parameters:

arg -

elm -

Returns:

Object

Throws:

EvaluationException

See Also:

Evaluator.eval(Object, PathElement)

update

public void update(java.lang.Object object,
                   PathElement elm,
                   java.lang.String newValue)
            throws EvaluationException

Description copied from interface: Updater

Update a attribute of an object from user input. That means that a single attribute of the object will be changed to a new value.

Specified by:

update in interface Updater

Parameters:

object - The object that will be updated

elm - A PathElement that describe the attribute to change

newValue - The newValue of the attribute. This value has to be converted to the right type.

Throws:

EvaluationException

See Also:

Updater.update(Object, PathElement, String)

prettyPrint

public java.lang.String prettyPrint(PathElement elm)

Description copied from class: Evaluator

Prettyprint the specified PathElement.

Overrides:

prettyPrint in class Evaluator

Parameters:

elm - DOCUMENT ME!

Returns:

DOCUMENT ME!

See Also:

Evaluator.prettyPrint(PathElement)