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MethodExpressionValidator (Java EE 5 SDK) - Java Platform, Enterprise Edition v5.0 API Specifications

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javax.faces.validator
Class MethodExpressionValidator

java.lang.Object
  javax.faces.validator.MethodExpressionValidator

All Implemented Interfaces:

EventListener, StateHolder, Validator

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public class MethodExpressionValidator
extends Object
implements Validator, StateHolder

MethodExpressionValidator is a Validator that wraps a MethodExpression, and it performs validation by executing a method on an object identified by the MethodExpression.

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Field Summary

 

Fields inherited from interface javax.faces.validator.Validator
NOT_IN_RANGE_MESSAGE_ID

 

Constructor Summary
MethodExpressionValidator()
MethodExpressionValidator(MethodExpression methodExpression)           Construct a Validator that contains a MethodExpression.

 

Method Summary
boolean	isTransient()           If true, the Object implementing this interface must not participate in state saving or restoring.
void	restoreState(FacesContext context, Object state)            Perform any processing required to restore the state from the entries in the state Object.
Object	saveState(FacesContext context)            Gets the state of the instance as a Serializable Object.
void	setTransient(boolean transientValue)           Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
void	validate(FacesContext context, UIComponent component, Object value)           Perform the correctness checks implemented by this Validator against the specified UIComponent.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

MethodExpressionValidator

public MethodExpressionValidator()

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MethodExpressionValidator

public MethodExpressionValidator(MethodExpression methodExpression)

Construct a Validator that contains a MethodExpression.

Method Detail

validate

public void validate(FacesContext context,
                     UIComponent component,
                     Object value)
              throws ValidatorException

Description copied from interface: Validator

Perform the correctness checks implemented by this Validator against the specified UIComponent. If any violations are found, a ValidatorException will be thrown containing the FacesMessage describing the failure.

Specified by:

validate in interface Validator

Parameters:

context - FacesContext for the request we are processing

component - UIComponent we are checking for correctness

value - the value to validate

Throws:

NullPointerException - if context or component is null

ValidatorException - if validation fails

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saveState

public Object saveState(FacesContext context)

Description copied from interface: StateHolder

Gets the state of the instance as a Serializable Object.

If the class that implements this interface has references to instances that implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.saveState(javax.faces.context.FacesContext) method on all those instances as well. This method must not save the state of children and facets. That is done via the StateManager

This method must not alter the state of the implementing object. In other words, after executing this code:

 Object state = component.saveState(facesContext);
 

component should be the same as before executing it.

The return from this method must be Serializable

Specified by:

saveState in interface StateHolder

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restoreState

public void restoreState(FacesContext context,
                         Object state)

Description copied from interface: StateHolder

Perform any processing required to restore the state from the entries in the state Object.

If the class that implements this interface has references to instances that also implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.restoreState(javax.faces.context.FacesContext, java.lang.Object) method on all those instances as well.

Specified by:

restoreState in interface StateHolder

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isTransient

public boolean isTransient()

Description copied from interface: StateHolder

If true, the Object implementing this interface must not participate in state saving or restoring.

Specified by:

isTransient in interface StateHolder

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setTransient

public void setTransient(boolean transientValue)

Description copied from interface: StateHolder

Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

Specified by:

setTransient in interface StateHolder

Parameters:

transientValue - boolean pass true if this Object will participate in state saving or restoring, otherwise pass false.

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