Class MethodExpressionValidator
- All Implemented Interfaces:
StateHolder
,Validator
,EventListener
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
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Constructor Summary
Constructors Constructor Description MethodExpressionValidator()
MethodExpressionValidator(jakarta.el.MethodExpression methodExpression)
Construct aValidator
that contains aMethodExpression
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Method Summary
Modifier and Type Method Description 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 aSerializable
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)
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Constructor Details
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MethodExpressionValidator
public MethodExpressionValidator() -
MethodExpressionValidator
public MethodExpressionValidator(jakarta.el.MethodExpression methodExpression)Construct a
Validator
that contains aMethodExpression
.- Parameters:
methodExpression
- the expression to wrap
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Method Details
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validate
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorExceptionDescription copied from interface:Validator
Perform the correctness checks implemented by this
Validator
against the specifiedUIComponent
. If any violations are found, aValidatorException
will be thrown containing theFacesMessage
describing the failure.For a validator to be fully compliant with Version 2 and later of the specification, it must not fail validation on
null
or empty values unless it is specifically intended to addressnull
or empty values. An application-wide<context-param>
is provided to allow validators designed for Jakarta Server Faces 1.2 to work with Jakarta Server Faces 2 and later. Thejakarta.faces.VALIDATE_EMPTY_FIELDS
<context-param>
must be set tofalse
to enable this backwards compatibility behavior.- Specified by:
validate
in interfaceValidator
- Parameters:
context
- FacesContext for the request we are processingcomponent
- UIComponent we are checking for correctnessvalue
- the value to validate- Throws:
NullPointerException
- ifcontext
orcomponent
isnull
ValidatorException
- if validation fails
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saveState
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 theStateHolder.saveState(jakarta.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 theStateManager
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 interfaceStateHolder
- Parameters:
context
- the Faces context.- Returns:
- the saved state.
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restoreState
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 theStateHolder.restoreState(jakarta.faces.context.FacesContext, java.lang.Object)
method on all those instances as well.If the
state
argument isnull
, take no action and return.- Specified by:
restoreState
in interfaceStateHolder
- Parameters:
context
- the Faces context.state
- the state.
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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 interfaceStateHolder
- Returns:
true
if transient,false
otherwise.
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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 interfaceStateHolder
- Parameters:
transientValue
- boolean passtrue
if this Object will not participate in state saving or restoring, otherwise passfalse
.
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