net.sourceforge.stripes.validation.expression

Class ExpressionExecutorSupport

java.lang.Object

net.sourceforge.stripes.validation.expression.ExpressionExecutorSupport

All Implemented Interfaces:

ExpressionExecutor

Direct Known Subclasses:

CommonsElExpressionExecutor, Jsp20ExpressionExecutor

public abstract class ExpressionExecutorSupport
extends Object
implements ExpressionExecutor

A base class that provides the general plumbing for running expression validation using the old JSP 2.0 style ExpressionEvaluator. Uses a custom VariableResolver to make fields of the ActionBean available in the expression.

Since:

Stripes 1.5

Author:

Tim Fennell

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	ExpressionExecutorSupport.BeanVariableResolver A JSP EL VariableResolver that first attempts to look up the value of the variable as a first level property on the ActionBean, and if does not exist then delegates to the built in resolver.

Field Summary

Fields inherited from interface net.sourceforge.stripes.validation.expression.ExpressionExecutor

ERROR_DEFAULT_SCOPE, ERROR_KEY, THIS

Constructor Summary

Constructors

Constructor and Description
ExpressionExecutorSupport()

Method Summary

Methods

Modifier and Type	Method and Description
void	evaluate(ActionBean bean, ParameterName name, List<Object> values, ValidationMetadata validationInfo, ValidationErrors errors) Performs validation of an ActionBean property using the expression contained within the validation metadata.
protected abstract ExpressionEvaluator	getEvaluator() Must be implemented by subclasses to return an instance of ExpressionEvaluator that can be used to execute expressions.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionExecutorSupport

public ExpressionExecutorSupport()

Method Detail

evaluate

public void evaluate(ActionBean bean,
            ParameterName name,
            List<Object> values,
            ValidationMetadata validationInfo,
            ValidationErrors errors)

Description copied from interface: ExpressionExecutor

Performs validation of an ActionBean property using the expression contained within the validation metadata. If the expression does not evaluate to true then an error will be added to the validation errors. Otherwise there are no side effects.

Specified by:

evaluate in interface ExpressionExecutor

Parameters:

bean - the ActionBean instance owning the field being validated

name - the name of the field being validated

values - the List of values (post type conversion), each to be validated

validationInfo - the validation metadata for the field

errors - the ValidationErrors object into which to place any errors

getEvaluator

protected abstract ExpressionEvaluator getEvaluator()

Must be implemented by subclasses to return an instance of ExpressionEvaluator that can be used to execute expressions.

Returns:

a working ExpressionEvaluator implementation.