public class MethodExpressionValidator extends java.lang.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.
| Constructor and Description |
|---|
MethodExpressionValidator() |
MethodExpressionValidator(MethodExpression methodExpression)
Construct a
Validator that contains a MethodExpression. |
| Modifier and Type | Method and Description |
|---|---|
boolean |
isTransient()
If true, the Object implementing this interface must not participate in state saving or restoring.
|
void |
restoreState(FacesContext context,
java.lang.Object state)
Perform any processing required to restore the state from the entries
in the state Object.
|
java.lang.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,
java.lang.Object value)
|
public MethodExpressionValidator()
public MethodExpressionValidator(MethodExpression methodExpression)
Construct a Validator that contains a MethodExpression.
methodExpression - the expression to wrappublic void validate(FacesContext context, UIComponent component, java.lang.Object value) throws ValidatorException
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.
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 address null or empty values. An
application-wide <context-param> is provided to allow validators designed for Jakarta Faces
1.2 to work with Jakarta Faces 2 and later. The jakarta.faces.VALIDATE_EMPTY_FIELDS
<context-param> must be set to false to enable this backwards compatibility behavior.
validate in interface Validatorcontext - FacesContext for the request we are processingcomponent - UIComponent we are checking for correctnessvalue - the value to validatejava.lang.NullPointerException - if context or component is nullValidatorException - if validation failspublic java.lang.Object saveState(FacesContext context)
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(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 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
saveState in interface StateHoldercontext - the Faces context.public void restoreState(FacesContext context, java.lang.Object state)
StateHolderPerform 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(jakarta.faces.context.FacesContext, java.lang.Object)
method on all those instances as well.
If the state argument is null, take no action and return.
restoreState in interface StateHoldercontext - the Faces context.state - the state.public boolean isTransient()
StateHolderIf true, the Object implementing this interface must not participate in state saving or restoring.
isTransient in interface StateHoldertrue if transient, false otherwise.public void setTransient(boolean transientValue)
StateHolderDenotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
setTransient in interface StateHoldertransientValue - boolean pass true if this Object will
not participate in state saving or restoring, otherwise pass false.