ValidatorTag (Java EE 5)

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javax.faces.webapp Class ValidatorTag

java.lang.Object
  extended by javax.servlet.jsp.tagext.TagSupport
      extended by javax.faces.webapp.ValidatorTag
All Implemented Interfaces:
Serializable, IterationTag, JspTag, Tag
Deprecated. This has been partially replaced by ValidatorELTag. The remainder of the functionality, namely, the binding facility and the implementation of the createValidator() method, is now an implementation detail.

Extends: TagSupport

ValidatorTag 是所有满足以下条件的 JSP 自定义操作的基类：对最接近的标记实例（其实现类为 UIComponentTag 的子类）所关联的 EditableValueHolder 创建并注册一个 Validator 实例。为了避免在重新显示页面时创建重复的实例，仅当执行当前页面期间拥有它的 UIComponentTag 创建相应的 UIComponent 时才创建和注册 Validator。

此类必须直接用来实现常规的验证器注册标记（基于 id 属性指定的验证器 ID），或者用作支持特定 Validator 子类的标记实例的基类。此 id 属性必须引用一个已知的验证器 ID，或 faces-config.xml 文件中定义的自定义验证器 ID。

此类的子类必须实现 createValidator() 方法，该方法创建并返回 Validator 实例。指定此 Validator 所执行限制的任何配置属性必须通过 createValidator() 方法进行了设置。这通常发生在复制标记实例相应的属性值时。

此标记没有对当前创建的页面创建任何输出。它仅用于创建 Validator 时产生的副作用。

deprecated 此类已经由 ValidatorELTag 部分替代。剩下的功能（即绑定工具和 #createValidator 方法的实现）现在是一个实现细节。
英文文档： 

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.

See Also:
Serialized Form

Field Summary
 
Fields inherited from class javax.servlet.jsp.tagext.TagSupport
id, pageContext
 
Fields inherited from interface javax.servlet.jsp.tagext.IterationTag
EVAL_BODY_AGAIN
 
Fields inherited from interface javax.servlet.jsp.tagext.Tag
EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
 
Constructor Summary
ValidatorTag()
          Deprecated.  
 
Method Summary
protected  Validator createValidator()
          Deprecated. Create and return a new Validator to be registered on our surrounding UIComponent.
 int doStartTag()
          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.
 void release()
          Deprecated. Release references to any acquired resources.
 void setBinding(String binding)
          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.
 void setValidatorId(String validatorId)
          Deprecated. Set the identifer of the Validator instance to be created.
 
Methods inherited from class javax.servlet.jsp.tagext.TagSupport
doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, removeValue, setId, setPageContext, setParent, setValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

public ValidatorTag()
英文文档：

ValidatorTag

public ValidatorTag()
Deprecated. 
Method Detail

public void setValidatorId(String validatorId)

设置要创建的 Validator 实例的标识符。

validatorId 要创建的验证器实例的新标识符。

英文文档：

setValidatorId

public void setValidatorId(String validatorId)
Deprecated. 

Set the identifer of the Validator instance to be created.

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

public void setBinding(String binding) throws JspException

设置将用来创建 ValueExpression（它引用要创建的 Validator 实例的支持 (backing) Bean 属性）的表达式。

binding 新表达式
ThrowsJspException: 如果发生 JSP 错误
英文文档：

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.

Parameters:
binding - The new expression
Throws:
JspException - if a JSP error occurs

public int doStartTag() throws JspException

创建指定 Validator 类的新实例，如果执行包含它的 JSP 页面时创建了 UIComponent 实例，则向最接近的 UIComponentTag 实例所关联的 UIComponent 实例注册该新实例。

ThrowsJspException: 如果发生 JSP 错误
英文文档：

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.

Specified by:
doStartTag in interface Tag
Overrides:
doStartTag in class TagSupport
Returns:
SKIP_BODY
Throws:
JspException - if a JSP error occurs
See Also:
Tag.doStartTag()

public void release()

释放对任何所需资源的引用。

英文文档：

release

public void release()
Deprecated. 

Release references to any acquired resources.

Specified by:
release in interface Tag
Overrides:
release in class TagSupport
See Also:
Tag.release()

protected Validator createValidator() throws JspException

创建并返回一个新的 Validator，以向接近的 UIComponent 注册。

ThrowsJspException: 如果无法创建新的实例
英文文档：

createValidator

protected Validator createValidator()
                             throws JspException
Deprecated. 

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

Throws:
JspException - if a new instance cannot be created
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