Class LengthValidator

  • All Implemented Interfaces:
    PartialStateHolder, StateHolder, Validator, EventListener

    public class LengthValidator
    extends Object
    implements Validator, PartialStateHolder

    LengthValidator is a Validator that checks the number of characters in the String representation of the value of the associated component. The following algorithm is implemented:

    • Convert the passed value to a String, if necessary, by calling its toString() method.
    • If a maximum property has been configured on this Validator, check the length of the converted String against this limit. If the String length is larger than the specified maximum, throw a ValidatorException containing a a MAXIMUM_MESSAGE_ID message.
    • If a minimum property has been configured on this Validator, check the length of the converted String against this limit. If the String length is less than the specified minimum, throw a ValidatorException containing a a MINIMUM_MESSAGE_ID message.

    For all of the above cases that cause a ValidatorException to be thrown, if there are parameters to the message that match up with validator parameters, the values of these parameters must be converted using the Converter registered in the application under the converter id jakarta.faces.Number. This allows the values to be localized according to the current Locale.

    • Field Detail

      • MAXIMUM_MESSAGE_ID

        public static final String MAXIMUM_MESSAGE_ID

        The message identifier of the FacesMessage to be created if the maximum length check fails. The message format string for this message may optionally include the following placeholders:

        • {0} replaced by the configured maximum length.
        • {1} replaced by a String whose value is the label of the input component that produced this message.
        See Also:
        Constant Field Values
      • MINIMUM_MESSAGE_ID

        public static final String MINIMUM_MESSAGE_ID

        The message identifier of the FacesMessage to be created if the minimum length check fails. The message format string for this message may optionally include the following placeholders:

        • {0} replaced by the configured minimum length.
        • {1} replaced by a String whose value is the label of the input component that produced this message.
        See Also:
        Constant Field Values
    • Constructor Detail

      • LengthValidator

        public LengthValidator()

        Construct a Validator with no preconfigured limits.

      • LengthValidator

        public LengthValidator​(int maximum)

        Construct a Validator with the specified preconfigured limit.

        Parameters:
        maximum - Maximum value to allow
      • LengthValidator

        public LengthValidator​(int maximum,
                               int minimum)

        Construct a Validator with the specified preconfigured limits.

        Parameters:
        maximum - Maximum value to allow
        minimum - Minimum value to allow
    • Method Detail

      • getMaximum

        public int getMaximum()

        Return the maximum length to be enforced by this Validator, or 0 if the maximum has not been set.

        Returns:
        the maximum
      • setMaximum

        public void setMaximum​(int maximum)

        Set the maximum length to be enforced by this Validator.

        Parameters:
        maximum - The new maximum value
      • getMinimum

        public int getMinimum()

        Return the minimum length to be enforced by this Validator, or 0 if the minimum has not been set.

        Returns:
        the minimum
      • setMinimum

        public void setMinimum​(int minimum)

        Set the minimum length to be enforced by this Validator.

        Parameters:
        minimum - The new minimum value
      • 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.

        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.

        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
      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object
      • 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(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

        Specified by:
        saveState in interface StateHolder
        Parameters:
        context - the Faces context.
        Returns:
        the saved state.
      • 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(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.

        Specified by:
        restoreState in interface StateHolder
        Parameters:
        context - the Faces context.
        state - the state.
      • 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
        Returns:
        true if transient, false otherwise.
      • 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 not participate in state saving or restoring, otherwise pass false.
      • initialStateMarked

        public boolean initialStateMarked()
        Description copied from interface: PartialStateHolder

        Return true if delta state changes are being tracked, otherwise false

        Specified by:
        initialStateMarked in interface PartialStateHolder
        Returns:
        true if the initial state is marked, false otherwise.