com.aragost.araspect.evaluators
Class Evaluator

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

Direct Known Subclasses:

CollectionEvaluator, FieldEvaluator, MapEvaluator, MethodEvaluator, StrutsObjectEvaluator

public abstract class Evaluator

extends java.lang.Object

Constructor Summary

Evaluator()

Method Summary

abstract java.lang.Object	eval(java.lang.Object arg, PathElement elm) Evaluate a PathElement for the specified Object.
static Evaluator	get(java.lang.String id) Return the Evaluator registered under the specified id.
static java.util.Map	getRegisteredEvaluators() DOCUMENT ME!
abstract java.lang.String	id() Return a unique id for the receiver.
java.lang.String	prettyPrint(PathElement elm) Prettyprint the specified PathElement.
void	register() Register the reciever as an Evaluator.
protected static void	register(Evaluator e)

Methods inherited from class java.lang.Object

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

Constructor Detail

Evaluator

public Evaluator()

Method Detail

id

public abstract java.lang.String id()

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

Returns:

String the id.

eval

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

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

Parameters:

arg -

elm -

Returns:

Object

Throws:

EvaluationException

prettyPrint

public java.lang.String prettyPrint(PathElement elm)

Prettyprint the specified PathElement.

Parameters:

elm - DOCUMENT ME!

Returns:

DOCUMENT ME!

register

public void register()

Register the reciever as an Evaluator. It is registered under the id returned by the id() method.

get

public static Evaluator get(java.lang.String id)

Return the Evaluator registered under the specified id. If none is registered return null.

Parameters:

id - DOCUMENT ME!

Returns:

DOCUMENT ME!

register

protected static void register(Evaluator e)

getRegisteredEvaluators

public static java.util.Map getRegisteredEvaluators()

DOCUMENT ME!

Returns:

DOCUMENT ME!