javax.faces.validator
Class LengthValidator

java.lang.Object
  extended by javax.faces.validator.LengthValidator
All Implemented Interfaces:
EventListener, PartialStateHolder, StateHolder, Validator

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:

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 javax.faces.Number. This allows the values to be localized according to the current Locale.


Field Summary
static String MAXIMUM_MESSAGE_ID
          The message identifier of the FacesMessage to be created if the maximum length check fails.
static String MINIMUM_MESSAGE_ID
          The message identifier of the FacesMessage to be created if the minimum length check fails.
static String VALIDATOR_ID
          The standard validator id for this validator.
 
Fields inherited from interface javax.faces.validator.Validator
NOT_IN_RANGE_MESSAGE_ID
 
Constructor Summary
LengthValidator()
          Construct a Validator with no preconfigured limits.
LengthValidator(int maximum)
          Construct a Validator with the specified preconfigured limit.
LengthValidator(int maximum, int minimum)
          Construct a Validator with the specified preconfigured limits.
 
Method Summary
 void clearInitialState()
          

Reset the PartialStateHolder to a non-delta tracking state.

 boolean equals(Object otherObj)
           
 int getMaximum()
          Return the maximum length to be enforced by this Validator, or 0 if the maximum has not been set.
 int getMinimum()
          Return the minimum length to be enforced by this Validator, or 0 if the minimum has not been set.
 int hashCode()
           
 boolean initialStateMarked()
          

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

 boolean isTransient()
          If true, the Object implementing this interface must not participate in state saving or restoring.
 void markInitialState()
          

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.

 void restoreState(FacesContext context, Object state)
           Perform any processing required to restore the state from the entries in the state Object.
 Object saveState(FacesContext context)
           Gets the state of the instance as a Serializable Object.
 void setMaximum(int maximum)
          Set the maximum length to be enforced by this Validator.
 void setMinimum(int minimum)
          Set the minimum length to be enforced by this Validator.
 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, Object value)
          Perform the correctness checks implemented by this Validator against the specified UIComponent.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

VALIDATOR_ID

public static final String VALIDATOR_ID

The standard validator id for this validator.

See Also:
Constant Field Values

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:

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:

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.


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.


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 JSF 1.2 to work with JSF 2 and later. The javax.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(javax.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

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(javax.faces.context.FacesContext, java.lang.Object) method on all those instances as well.

Specified by:
restoreState in interface StateHolder

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

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 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(javax.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

clearInitialState

public void clearInitialState()
Description copied from interface: PartialStateHolder

Reset the PartialStateHolder to a non-delta tracking state.

Specified by:
clearInitialState in interface PartialStateHolder


Copyright 2002-2009 Sun Microsystems, Inc. All Rights Reserved.