ConverterELTag (Java EE 5 SDK)

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Java EE 5 SDK

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摘要: 嵌套 | 字段 | 构造器 | 方法

详细信息: 字段 | 构造器 | 方法

javax.faces.webapp Class ConverterELTag

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

所有已实现的接口:: Serializable, IterationTag, JspTag, Tag

public abstract class ConverterELTag
extends TagSupport

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

This class may be used as a base class for tag instances that support specific Converter subclasses.

Subclasses of this class must implement the createConverter() method, which creates and returns a Converter instance. Any configuration properties that specify behavior of this Converter must have been set by the createConverter() 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 Converter creation.

另请参见:: Serialized Form

字段摘要

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`

构造器摘要
`ConverterELTag()`

方法摘要
`protected abstract Converter`	`createConverter()` Create and return a new `Converter` to be registered on our surrounding `UIComponent`.
`int`	`doStartTag()` Create a new instance of the specified `Converter` class, and register it with the `UIComponent` instance associated with our most immediately surrounding `UIComponentClassicTagBase` instance, if the `UIComponent` instance was created by this execution of the containing JSP page.

类方法继承 javax.servlet.jsp.tagext.TagSupport
`doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue`

类方法继承 java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

构造器详细信息

ConverterELTag

public ConverterELTag()

方法详细信息

doStartTag

public int doStartTag()
               throws JspException

Create a new instance of the specified Converter class, and register it with the UIComponent instance associated with our most immediately surrounding UIComponentClassicTagBase instance, if the UIComponent instance was created by this execution of the containing JSP page. If the localValue of the UIComponent is a String, attempt to convert it.

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()

createConverter

protected abstract Converter createConverter()
                                      throws JspException

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

抛出异常:: JspException - if a new instance cannot be created

概述