ValidatorTag (Java EE 5 SDK)

javax.faces.webapp Class ValidatorTag

java.lang.Object
  javax.servlet.jsp.tagext.TagSupport
      javax.faces.webapp.ValidatorTag

所有已实现的接口:

Serializable, IterationTag, JspTag, Tag

public class ValidatorTag

extends TagSupport

ValidatorTag is a base class for all JSP custom actions that create and register a Validator instance on the EditableValueHolder associated with our most immediate surrounding instance of a tag whose implementation class is a subclass of UIComponentTag. To avoid creating duplicate instances when a page is redisplayed, creation and registration of a Validator occurs only if the corresponding UIComponent was created (by the owning UIComponentTag) during the execution of the current page.

This class may be used directly to implement a generic validator registration tag (based on the validator-id specified by the id attribute), or as a base class for tag instances that support specific Validator subclasses. This id attribute must refer to one of the well known validator-ids, or a custom validator-id as defined in a faces-config.xml file.

Subclasses of this class must implement the createValidator() method, which creates and returns a Validator instance. Any configuration properties that specify the limits to be enforced by this Validator must have been set by the createValidator() method. Generally, this occurs by copying corresponding attribute values on the tag instance.

This tag creates no output to the page currently being created. It is used solely for the side effect of Validator creation.

另请参见:

Serialized Form

ValidatorTag

public ValidatorTag()

Deprecated. 

setValidatorId

public void setValidatorId(String validatorId)

Deprecated. 

Set the identifer of the Validator instance to be created.

参数:

validatorId - The new identifier of the validator instance to be created.

setBinding

public void setBinding(String binding)
                throws JspException

Deprecated. 

Set the expression that will be used to create a ValueExpression that references a backing bean property of the Validator instance to be created.

参数:

binding - The new expression

抛出异常:

JspException - if a JSP error occurs

doStartTag

public int doStartTag()
               throws JspException

Deprecated. 

Create a new instance of the specified Validator class, and register it with the UIComponent instance associated with our most immediately surrounding UIComponentTag instance, if the UIComponent instance was created by this execution of the containing JSP page.

规范说明:

doStartTag in interface Tag

重写:

doStartTag in class TagSupport

返回:

SKIP_BODY

抛出异常:

JspException - if a JSP error occurs

另请参见:

Tag.doStartTag()

release

public void release()

Deprecated. 

Release references to any acquired resources.

规范说明:

release in interface Tag

重写:

release in class TagSupport

另请参见:

Tag.release()

createValidator

protected Validator createValidator()
                             throws JspException

Deprecated. 

Create and return a new Validator to be registered on our surrounding UIComponent.

抛出异常:

JspException - if a new instance cannot be created

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