DoubleRangeValidator (Java EE 5 SDK)

javax.faces.validator Class DoubleRangeValidator

java.lang.Object
  javax.faces.validator.DoubleRangeValidator

所有已实现的接口:

EventListener, StateHolder, Validator

public class DoubleRangeValidator

extends Object

implements Validator, StateHolder

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.

VALIDATOR_ID

public static final String VALIDATOR_ID

The standard converter id for this converter.

另请参见:

常量字段

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.

另请参见:

常量字段

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.

另请参见:

常量字段

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.

另请参见:

常量字段

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.

另请参见:

常量字段

DoubleRangeValidator

public DoubleRangeValidator()

Construct a Validator with no preconfigured limits.

DoubleRangeValidator

public DoubleRangeValidator(double maximum)

Construct a Validator with the specified preconfigured limit.

参数:

maximum - Maximum value to allow

DoubleRangeValidator

public DoubleRangeValidator(double maximum,
                            double minimum)

Construct a Validator with the specified preconfigured limits.

参数:

maximum - Maximum value to allow

minimum - Minimum value to allow

getMaximum

public double getMaximum()

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

setMaximum

public void setMaximum(double maximum)

Set the maximum value to be enforced by this Validator.

参数:

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.

setMinimum

public void setMinimum(double minimum)

Set the minimum value to be enforced by this Validator.

参数:

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.

规范说明:

validate in interface Validator

参数:

context - FacesContext for the request we are processing

component - UIComponent we are checking for correctness

value - the value to validate

抛出异常:

NullPointerException - if context or component is null

ValidatorException - if validation fails

equals

public boolean equals(Object otherObj)

重写:

equals in class Object

hashCode

public int hashCode()

重写:

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

规范说明:

saveState in interface StateHolder

public void restoreState(FacesContext context,
                         Object state)

public boolean isTransient()

public void setTransient(boolean transientValue)