ValidatorELTag (Java EE 5)

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javax.faces.webapp Class ValidatorELTag

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

All Implemented Interfaces:: Serializable, IterationTag, JspTag, Tag

public abstract class ValidatorELTag
extends TagSupport

Extends: TagSupport

ValidatorELTag 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 UIComponentTagBase 创建相应的 UIComponent 时才创建和注册 Validator。

此类必须用作支持特定 Validator 子类的标记实例的基类。

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。

英文文档：

ValidatorELTag 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 UIComponentTagBase) during the execution of the current page.

This class must be used as a base class for tag instances that support specific Validator subclasses.

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
`ValidatorELTag()`

Method Summary
`protected abstract Validator`	`createValidator()` Create and return a new `Validator` to be registered on our surrounding `UIComponent`.
`int`	`doStartTag()` Create a new instance of the specified `Validator` class, and register it with the `UIComponent` instance associated with our most immediately surrounding `UIComponentTagBase` instance, if the `UIComponent` instance was created by this execution of the containing JSP page.

Methods inherited from class javax.servlet.jsp.tagext.TagSupport
`doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, 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 ValidatorELTag()

英文文档：
ValidatorELTag

public ValidatorELTag()

Method Detail

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 `UIComponentTagBase` 实例所关联的 `UIComponent` 实例注册该新实例。

Throws JspException: 如果发生 JSP 错误

英文文档：
doStartTag

public int doStartTag()
               throws JspException

Create a new instance of the specified Validator class, and register it with the UIComponent instance associated with our most immediately surrounding UIComponentTagBase 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()

abstract protected Validator createValidator() throws JspException

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

Throws JspException: 如果无法创建新的实例

英文文档：
createValidator

protected abstract Validator createValidator()
                                      throws JspException

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

Throws:: JspException - if a new instance cannot be created