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package javax.faces.validator;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import java.util.EventListener;
/**
* <p>A <strong class="changed_modified_2_0">Validator</strong>
* implementation is a class that can perform validation (correctness
* checks) on a {@link javax.faces.component.EditableValueHolder}. Zero
* or more <code>Validator</code>s can be associated with each {@link
* javax.faces.component.EditableValueHolder} in the view, and are
* called during the <em>Process Validations</em> phase of the request
* processing lifecycle.</p>
*
* <p>Individual {@link Validator}s should examine the value and
* component that they are passed, and throw a {@link ValidatorException}
* containing a {@link javax.faces.application.FacesMessage}, documenting
* any failures to conform to the required rules.
*
* <p>For maximum generality, {@link Validator} instances may be
* configurable based on properties of the {@link Validator} implementation
* class. For example, a range check {@link Validator} might support
* configuration of the minimum and maximum values to be used.</p>
*
* <p>{@link Validator} implementations must have a zero-arguments
* public constructor. In addition, if the {@link Validator} class
* wishes to have configuration property values saved and restored with
* the view, the implementation must also implement {@link
* javax.faces.component.StateHolder}.</p>
* <p class="changed_added_2_0">If the class implementing
* <code>Validator</code> has a {@link
* javax.faces.application.ResourceDependency} annotation, the action
* described in <code>ResourceDependency</code> must be taken when
* {@link javax.faces.component.EditableValueHolder#addValidator} is
* called. If the class implementing <code>Validator</code> has a {@link
* javax.faces.application.ResourceDependencies} annotation, the
* action described in <code>ResourceDependencies</code> must be taken
* when {@link javax.faces.component.EditableValueHolder#addValidator}
* is called.</p>
*
* @param <T> The generic type of object value to validate.
*/
public interface Validator<T> extends EventListener {
/**
* <p>The message identifier of the {@link javax.faces.application.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
* <code>{0}</code> placeholder, which will be replaced by the
* configured minimum value, and a <code>{1}</code> placeholder,
* which will be replaced by the configured maximum value.</p>
*
* @deprecated Use {@link DoubleRangeValidator#NOT_IN_RANGE_MESSAGE_ID} or
* {@link LongRangeValidator#NOT_IN_RANGE_MESSAGE_ID} instead.
*/
public static final String NOT_IN_RANGE_MESSAGE_ID =
"javax.faces.validator.NOT_IN_RANGE";
/**
* <p><span class="changed_modified_2_0">Perform</span> the
* correctness checks implemented by this {@link Validator} against
* the specified {@link UIComponent}. If any violations are found,
* a {@link ValidatorException} will be thrown containing the {@link
* javax.faces.application.FacesMessage} describing the failure.
*
* <div class="changed_added_2_0">
*
* <p>For a validator to be fully compliant with Version 2 and later
* of the specification, it must not fail validation on
* <code>null</code> or empty values unless it is specifically
* intended to address <code>null</code> or empty values. An
* application-wide <code><context-param></code> is provided
* to allow validators designed for JSF 1.2 to work with JSF 2 and
* later. The <code>javax.faces.VALIDATE_EMPTY_FIELDS</code>
* <code><context-param></code> must be set to
* <code>false</code> to enable this backwards compatibility
* behavior.</p>
*
* </div>
*
* @param context FacesContext for the request we are processing
* @param component UIComponent we are checking for correctness
* @param value the value to validate
* @throws ValidatorException if validation fails
* @throws NullPointerException if <code>context</code>
* or <code>component</code> is <code>null</code>
*/
public void validate(FacesContext context,
UIComponent component,
T value) throws ValidatorException;
}