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The JavaServer Faces Framework
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a value that has been successfully converted This method must throw a ValidatorException if the validation fails If no such exception is thrown, the system assumes validation has succeeded and marks the component as valid If the exception is thrown, its message is extracted and added to the set of messages on the current FacesContext and processing continues Standard Faces validators run on the server, though it s possible to write a validator that executes entirely on the client Even when using client-side validation, it is strongly advisable to perform server-side validation as a double-check against malicious code in the browser As with converters, Faces provides a small but useful set of standard Validator implementations, listed in Table 8-3 Unlike converters, Validator instances are not registered by class, only by validator-id This is because the concept of validation is not tied tightly to an object s type For example, it is possible for a number to be a valid credit card number but still be expired Expired credit cards are of no use to an e-commerce system! In addition to the validators shown in Table 8-3, Faces also provides a facility to specify that a value is required, but since this feature is so commonly used, it has been implemented for maximum correctness and simplicity and does not use the regular validation system Let s examine the standard validators and the required facility in detail The validation messages used in this section paraphrase the meaning of the message The real messages will be dealt with later in this chapter, in the section Tie It All Together: Messages in a View
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Tag Handler f:validateDoubleRange
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Description Validates that data of type javalangDouble is within a specified range Validates that data of type String has a length that is within a specified range Validates that data of type javalangLong is within a specified range Causes the local value pointed to by the component to be validated by Java EE bean validation (This feature will be described later in this chapter) Allows the usage of the powerful Java Regular Expression feature within JSF pages A nestable validator that does the same thing as the required tag attribute
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TABLE 8-3
The Standard Validators
8:
C o n v e r t i n g a n d Va l i d a t i n g D a t a
LongRangeValidator
LongRangeValidatorvalidate( ) verifies that the value of the component to which it is attached is within a specified range using an algorithm similar to the following: 1 The argument value has already been converted This means that it is an instance of javalangLong Therefore, the primitive long value is extracted 2 If the user set a maximum parameter for this Validator instance, the value is checked against the configured maximum If the value is greater than the maximum, one of two exceptions must be thrown First, if the user configured a minimum parameter, then the value is not within the specified range In this case, a ValidatorException with a not in range message is thrown Second, if no minimum parameter is specified, then a ValidatorException with a greater than the specified maximum message is thrown 3 If the user set a minimum parameter for this Validator instance, the value is checked against the configured minimum If the value is less than the minimum, one of two exceptions must be thrown First, if the user configured a maximum parameter, then the value is not in the specified range In this case, a ValidatorException with a not in range message is thrown Second, if no maximum parameter is specified, then a ValidatorException with a less than the specified minimum message is thrown 4 If a NumberFormatException was thrown during processing, a ValidatorException with a there was a type error during validation message is thrown This class also implements the equals( ) method to allow comparing two instances The equals( ) method returns true if the other Validator is configured with the same parameter values for maximum and minimum The following example illustrates the use of the f:validateLongRange tag, which exposes the LongRangeValidator to the markup page author
<p>Enter a California Zip Code: <h:inputText value="#{useraddresszip}" id="zip"> <f:validateLongRange minimum="90000" maximum="99999" /> </h:inputText> <h:message for="zip" /></p>
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