Validator (Java EE 5 SDK)

javax.faces.validator Interface Validator

所有父接口:

EventListener

所有已知实现子孙类:

DoubleRangeValidator, LengthValidator, LongRangeValidator, MethodExpressionValidator

public interface Validator

extends EventListener

A Validator implementation is a class that can perform validation (correctness checks) on a EditableValueHolder. Zero or more Validators can be associated with each EditableValueHolder in the view, and are called during the Process Validations phase of the request processing lifecycle.

Individual Validators should examine the value and component that they are passed, and throw a ValidatorException containing a FacesMessage, documenting any failures to conform to the required rules.

For maximum generality, Validator instances may be configurable based on properties of the Validator implementation class. For example, a range check Validator might support configuration of the minimum and maximum values to be used.

Validator implementations must have a zero-arguments public constructor. In addition, if the Validator class wishes to have configuration property values saved and restored with the view, the implementation must also implement StateHolder.

NOT_IN_RANGE_MESSAGE_ID

static final String NOT_IN_RANGE_MESSAGE_ID

Deprecated. Use DoubleRangeValidator.NOT_IN_RANGE_MESSAGE_ID or LongRangeValidator.NOT_IN_RANGE_MESSAGE_ID instead.

The message identifier of the FacesMessage to be created if the maximum or minimum value check fails, and both the maximum and minimum values for this validator have been set. The message format string for this message may optionally include a {0} placeholder, which will be replaced by the configured minimum value, and a {1} placeholder, which will be replaced by the configured maximum value.

另请参见:

常量字段

validate

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

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.

参数:

context - FacesContext for the request we are processing

component - UIComponent we are checking for correctness

value - the value to validate

抛出异常:

ValidatorException - if validation fails

NullPointerException - if context or component is null

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