Package jakarta.faces.validator

Class LengthValidator

java.lang.Object
jakarta.faces.validator.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 Details

    • VALIDATOR_ID

      public static final String VALIDATOR_ID

      The standard validator id for this validator.

      See Also:

    • 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:

    • 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:

  • Constructor Details

    • 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 Details

    • 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 Server Faces 1.2 to work with Jakarta Server 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

    • equals

      public boolean equals(Object otherObj)
      Overrides:
      equals in class Object

    • 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.

    • markInitialState

      public void markInitialState()
      Description copied from interface: PartialStateHolder

      The runtime must ensure that the PartialStateHolder.markInitialState() method is called on each instance of this interface in the view at the appropriate time to indicate the component is in its initial state. The implementor of the interface must ensure that PartialStateHolder.initialStateMarked() returns true from the time markInitialState() is called until PartialStateHolder.clearInitialState() is called, after which time initialStateMarked() must return false. Also, during the time that the instance returns true from initialStateMarked(), the implementation must return only the state that has changed in its implementation of StateHolder.saveState(jakarta.faces.context.FacesContext).

      Specified by:
      markInitialState in interface PartialStateHolder

    • 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.

    • clearInitialState

      public void clearInitialState()
      Description copied from interface: PartialStateHolder

      Reset the PartialStateHolder to a non-delta tracking state.

      Specified by:
      clearInitialState in interface PartialStateHolder