javax.faces.validator

Class DoubleRangeValidator

java.lang.Object

javax.faces.validator.DoubleRangeValidator

All Implemented Interfaces:

EventListener, PartialStateHolder, StateHolder, Validator

public class DoubleRangeValidator
extends Object
implements Validator, PartialStateHolder

DoubleRangeValidator is a Validator that checks the value of the corresponding component against specified minimum and maximum values. The following algorithm is implemented:

• If the passed value is null, exit immediately.
• If the current component value is not a floating point type, or a String that is convertible to double, throw a ValidatorException containing a TYPE_MESSAGE_ID message.
• If both a maximum and minimum property has been configured on this Validator, check the component value against both limits. If the component value is not within this specified range, throw a ValidatorException containing a NOT_IN_RANGE_MESSAGE_ID message.
• If a maximum property has been configured on this Validator, check the component value against this limit. If the component value is greater than the specified maximum, throw a ValidatorException containing a MAXIMUM_MESSAGE_ID message.
• If a minimum property has been configured on this Validator, check the component value against this limit. If the component value is less than the specified minimum, throw a ValidatorException containing 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 javax.faces.Number. This allows the values to be localized according to the current Locale.

Field Summary

Fields

Modifier and Type	Field and Description
static String	MAXIMUM_MESSAGE_ID The message identifier of the FacesMessage to be created if the maximum value check fails.
static String	MINIMUM_MESSAGE_ID The message identifier of the FacesMessage to be created if the minimum value check fails.
static String	NOT_IN_RANGE_MESSAGE_ID 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.
static String	TYPE_MESSAGE_ID The message identifier of the FacesMessage to be created if the current value of this component is not of the correct type.
static String	VALIDATOR_ID The standard converter id for this converter.

Constructor Summary

Constructors

Constructor and Description
DoubleRangeValidator() Construct a Validator with no preconfigured limits.
DoubleRangeValidator(double maximum) Construct a Validator with the specified preconfigured limit.
DoubleRangeValidator(double maximum, double minimum) Construct a Validator with the specified preconfigured limits.

Method Summary

Modifier and Type	Method and Description
void	clearInitialState() Reset the PartialStateHolder to a non-delta tracking state.
boolean	equals(Object otherObj) Overrides the default equals method to take the minimum and maximum into account when comparing DoubleRangeValidator instances.
double	getMaximum() Return the maximum value to be enforced by this Validator or Double.MAX_VALUE if it has not been set.
double	getMinimum() Return the minimum value to be enforced by this Validator, or Double.MIN_VALUE if it has not been set.
int	hashCode() Overrides the default hash code method to take the minimum and maximum into account when generating the hash code.
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(double maximum) Set the maximum value to be enforced by this Validator.
void	setMinimum(double minimum) Set the minimum value 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 converter id for this converter.

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 value check fails. The message format string for this message may optionally include the following placeholders:

• {0} replaced by the configured maximum value.
• {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 value check fails. The message format string for this message may optionally include the following placeholders:

• {0} replaced by the configured minimum value.
• {1} replaced by a String whose value is the label of the input component that produced this message.

See Also:

Constant Field Values

NOT_IN_RANGE_MESSAGE_ID

public static final String NOT_IN_RANGE_MESSAGE_ID

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 the following placeholders:

• {0} replaced by the configured minimum value.
• {1} replaced by the configured maximum value.
• {2} replaced by a String whose value is the label of the input component that produced this message.

See Also:

Constant Field Values

TYPE_MESSAGE_ID

public static final String TYPE_MESSAGE_ID

The message identifier of the FacesMessage to be created if the current value of this component is not of the correct type. The message format string for this message may optionally include a {0} placeholder that will be replaced by a String whose value is the label of the input component that produced this message.

See Also:

Constant Field Values

Constructor Detail

DoubleRangeValidator

public DoubleRangeValidator()

Construct a Validator with no preconfigured limits.

DoubleRangeValidator

public DoubleRangeValidator(double maximum)

Construct a Validator with the specified preconfigured limit.

Parameters:

maximum - Maximum value to allow

DoubleRangeValidator

public DoubleRangeValidator(double maximum,
                            double minimum)

Construct a Validator with the specified preconfigured limits.

Parameters:

maximum - Maximum value to allow

minimum - Minimum value to allow

Method Detail

getMaximum

public double getMaximum()

Return the maximum value to be enforced by this Validator or Double.MAX_VALUE if it has not been set.

Returns:

the maximum

setMaximum

public void setMaximum(double maximum)

Set the maximum value to be enforced by this Validator.

Parameters:

maximum - The new maximum value

getMinimum

public double getMinimum()

Return the minimum value to be enforced by this Validator, or Double.MIN_VALUE if it has not been set.

Returns:

the minimum value

setMinimum

public void setMinimum(double minimum)

Set the minimum value 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 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 the default equals method to take the minimum and maximum into account when comparing DoubleRangeValidator instances.

Overrides:

equals in class Object

Parameters:

otherObj - the object to compare against.

Returns:

true if equal, false otherwise.

hashCode

public int hashCode()

Overrides the default hash code method to take the minimum and maximum into account when generating the hash code.

Overrides:

hashCode in class Object

Returns:

the hash code.

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

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(javax.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(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

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